Instructions

Manuals Brands Datataker Manuals Data Loggers Datataker DT-80M Multi-channel data logger

Intelligent Data Logging Products

DT80 Range

DT80/81/82/85

Series 1,2,3 & 4

Includes CEM20

User's Manual

A complete guide to:

• data acquisition

• data logging

• programming

• sensor wiring

• communications

Summary of content (417 pages)

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Intelligent Data Logging Products DT80 Range DT80/81/82/85 Series 1,2,3 & 4 Includes CEM20 User's Manual A complete guide to: • • • • • data acquisition data logging programming sensor wiring communications
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DT80 Range User’s Manual © Copyright 2005-2017 Thermo Fisher Scientific Australia Pty Ltd ABN 52 058 390 917 UM-0085-B10  Warranty Thermo Fisher Scientific Australia Pty Ltd (“Thermo Fisher”) warrants the instruments it manufactures against defects in either the materials or the workmanship for a period of three years from the date of delivery to the original customer.
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 FCC / IC Statements This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
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Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.  Disposal of Product and Batteries This product is subject to the EU Directive 2012/19/EU for Waste Electrical and Electronic Equipment (WEEE). As such product must not be disposed of in general waste facilities. Please refer to local regulations or contact your distributor on he to dispose this product in an environmentally friendly manner.
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Content Content ...................................................................................................................... 5 Part A – The DT80 ...................................................................................... 14 DT80 Concepts ........................................................................................................ 14 What is the DT80? ..............................................................................................................................
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General-Purpose Report Schedules ........................................................................................................... 51 Immediate Report Schedules ...................................................................................................................... 56 Statistical Report Schedules ....................................................................................................................... 57 Working with Schedules ...........................................
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Alarm Action Processes .............................................................................................................................. 88 Alarm Records......................................................................................................... 92 Real Time Alarm Return.............................................................................................................................. 92 Logging Alarms .....................................................................
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Connecting to the Web Interface ............................................................................................................... 124 dEX Home Page ....................................................................................................................................... 124 Starting dEX .............................................................................................................................................. 125 Browser Requirements..............................
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The Command Interface ....................................................................................... 186 Connecting to the Command Interface...................................................................................................... 186 Command Interface Operation .................................................................................................................. 186 Detecting DT80 Presence ....................................................................................
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WiFi Interface ............................................................................................................................................ 240 WiFi Commands ....................................................................................................................................... 240 Setting up WiFi Connection....................................................................................................................... 244 PPP Communications ............................
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External Power .......................................................................................................................................... 287 Internal Power ........................................................................................................................................... 288 Power Outputs .......................................................................................................................................... 290 Signal Output ........................
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Control String – Output Actions ................................................................................................................. 351 Control String – Input Actions ................................................................................................................... 353 Control String – Example .......................................................................................................................... 355 Schedules .................................................
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Firmware Upgrade – Host USB or RS232 Port ......................................................................................... 395 Firmware Upgrade – Remote TCP/IP ....................................................................................................... 396 Reverting Back to Old Firmware ............................................................................................................... 396 In Case of Failed Upgrade ..............................................................
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Part A – The DT80 Figure 1: The dataTaker DT80, DT80W (left); DT85W, DT85GM, CEM20 (centre), DT82EM, DT82I (right) DT80 Concepts What is the DT80? The dataTaker DT80 range of data acquisition and logging instruments are tools to measure and record a wide variety of quantities and values in the real world. The web based dEX graphical user interface makes it quick and easy to define basic measurement tasks.
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• The DT82I is designed for industrial applications. • The DT85 is an expanded and enhanced version of the DT80. • The DT80L and DT85L are low power variants of the DT80 and DT85. • The DT80W and DT85W are WiFi variant of the DT80 and DT85. • The DT80G and DT85G GeoLoggers are designed for Geotechnical applications • The DT80GW and DT85GW are WiFi variant of the DT80G and DT85G. • The DT80GL and DT85GL are low power variants of the DT80G and DT85G.
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DT82I-3 DT80-3 DT80G-3 DT80L-3 DT85-3 DT85G-3 DT85L-3 DT85LM2-3 DT85LM3-3 DT85GL-3 DT85GLM2-3 DT85GLM3-3 5 current models 5 5 5 16 16 16 16 16 16 16 16 - -                           - - - - - - - - - -                   3 1 4 1      1.2 4  - 4 4 4 2       1.2   3  - 4 4 4 2         4.0   4  - 3 1 4 1       1.
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DT80G- 4 DT80L- 4 DT80LM3- 4 DT85- 4 DT85G- 4 DT85L- 4 DT85LM3- 4 DT85GL-3 DT85GLM3- 4 DT85W-4 DT85GW-4 2 5 5 5 5 current models 5 5 5 16 16 16 16 16 16 16 16                                     3 1 4         - 3 1 4         - 5 4 4 4 4 4 2 2              1.2 1.
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DT80-Friendly Software Programming and Configuration There are three main ways to set up and program the DT80. • dEX is a web based application for programming and monitoring DT80 Series 2/ 3/ 4 data loggers. dEX is built into the logger (no installation required) and runs in your web browser. It provides a totally graphical interface, which means that knowledge of the dataTaker programming language is not required.
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 Sensor Interface On the sloping front panel of the DT80 there are two rows of terminal blocks – digital channels on the left, analog channels on the right. The green terminal blocks can be quickly unplugged from the DT80 without unscrewing the sensor cabling.
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Switch On! When power is connected, you should observe: • the LCD backlight switches on (DT80/ 85), and the green Power LED starts flashing • a brief clicking sound as the unit performs an initial self-calibration • DT80 restarted / Power loss is displayed on the LCD • the front panel LEDs flash a few times then the red Attn LED continues to flash. The DT80 is warning you that its power has been interrupted. Press any of the front panel keys to clear this indication.
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The general categories of commands are: • • • • • channel definitions (P33) (e.g. 2TK("Kiln temp",FF4)) – these define what measurements are to be taken, how they are to be acquired and how the measured values are to be presented. schedule definitions (P48) (e.g. RA(DATA:2MB)10S) – these define when a set of measurements are to be taken and where the results are to be stored job management commands (P61) (e.g.
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Measurements What can the DT80 Measure? Analog Using its analog inputs, the DT80 can directly measure the following: • DC voltage (30mV, 300mV, 3V , 50V, (30V – Series 3 or older) ranges) • DC current (0.3mA, 3mA and 30mA ranges with internal 100 Ohm shunt) • resistance (10Ω, 100Ω, 1kΩ, 10kΩ (maximum for Series 3 or older), 1MΩ ranges) • frequency (0.
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The exact function of each terminal varies depending on how the channel is programmed.
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In a shared-terminal configuration, a sensor’s "return" or "negative" wire is usually connected to the channel's # terminal. The remaining sensor wire (the "positive" or "signal") is connected to any of the channel’s other three terminals. The common terminal need not be at ground potential – all voltage measurements (shared or unshared) are differential, i.e. only the difference in voltage between the two terminals is reported.
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Digital Channels – Introduction Figure 6: DT80 digital terminals The DT80 provides: • 4 bidirectional digital I/O channels (1D-4D) with open drain output driver and pull-up resistor (DT81/ 82E: 3 channels, 1D-3D) • 4 bidirectional digital I/O channels (5D-8D) with tri-stateable output driver and weak pull-down resistor.
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Programming the DT80 Typical Workflow When creating a program to send to the DT80, typically the work will follow this order: Connect Sensors Sensors & Channels (P302) describes how to measure many different quantities and read many different sensor types using the DT80’s analog, digital and serial inputs. The first step is therefore to refer to the sub-section relating to the quantity you wish to measure. This will help you decide on the most appropriate way to connect the sensor to the DT80.
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Define Measurement Schedules A schedule defines when a set of channels should be measured. It consists of a list of channel definitions preceded by a scan trigger specification. See Schedules (P48). As a general rule when creating schedules, don’t instruct the DT80 to read channels more frequently than is really necessary. For example, temperatures generally change slowly so rapid reading does not provide extra useful information.
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Retrieving Data The DT80 can do two things with the data it measures: • Return it immediately to the host computer, where it can be seen arriving on-screen. This monitoring function is data return in real time. • Store it in its internal memory and/or an inserted USB memory device ready for retrieval (unload) to the host computer at a later time. This is data logging. The DT80 can carry out these functions separately, or at the same time.
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The DT80 File System (P114).
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Format of Returned Data As mentioned earlier, the DT80 can: • make data available to a host computer as it is measured (real-time data), and/or • store data in memory to be retrieved at a later date (logged data) You can control whether data is returned or logged on a per channel, per schedule or global basis. Real-time data Web Access (dEX) If the DT80 is connected to a host computer via a TCP/IP network then the logger's built in web interface can be used to display real-time data in any web browser.
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In fixed format mode: • all formatting commands (e.g. FF2, /n, channel names) are ignored – fixed settings are used • all records are prefixed by a header, which specifies that this is a data record (D), from DT80 serial number 081044, running a job called "JOB1". This is followed a timestamp (date, time, and sub-second time). The 0 indicates that this is real-time data, the A identifies the schedule, and the 0 is the indEX within the schedule of the first data value.
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 Variations To simplify parsing by host applications, the CSV format files generated by the DT80 are essentially fixed format. However the following parameters may be used to vary the format: • P38 can be used to change the character used as the decimal point. By default, this is set to 46, which is the ASCII code for a period character (.). For European applications, it is often set to 44, which is the code for comma (,).
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Part B – Channels Channel Definitions A channel definition defines a measurement to be taken. It is therefore the fundamental building block that you use when programming the DT80. Channel definitions are normally enclosed in a schedule definition. The schedule definition specifies when to take the measurements. The channel definitions specify what to measure, on which terminals and how to sample and process the data value. A sample schedule definition is shown below RA2S 2DS 3R(4W) 2*V(0.
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Channel class TCP/IP Terminal labels Channel numbers power output 12V 5V SW 12/5V V/I DAC no number SDI-12 5D – 8D (DT80/ 85) 4D (DT81/ 82) channel variable internal system variable internal string internal timer internal temperature reference internal no number (DT8x) 1 – 15 (CEM20) special internal no number 4 5 – 8 (DT80/ 85) 4 (DT81/ 82) 1 – 1000 1 – 85 1 – 50 1–4 Applicable channel types MODBUS PWR12V (Series 3, 4 only) PWR5V (Series 3 only) PWR_OUT (Series 4 only) VDAC IDAC (S
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Category Channel Type Signal\ Sensor Details Default Channel Options Channel Factor Output Units V Voltage input ranges are ±3V, ±300mV & ±30mV (U) Note 1 scaling factor mV HV Higher Voltage input ranges are ±50V (±30V Series3 or older) ±3V & ±300mV (A) scaling factor V I Current (100,T) current shunt Ω mA L 4-20mA current loop (100) current shunt Ω % R Resistance by 2, 3 or 4-wire methods, 10KΩ, (1MΩ Series4) maximum.
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Category Time, Date and System Timers Channel Type 1ST 2ST 3ST 4ST writable Delay DELAY writable SV Signal\ Sensor Details Default Channel Options Channel Factor Output Units System timers Increment every sec (1ST), min (2ST), hour (3ST), day (4ST) (60) (60) (24) (7) range Counts System Timers (P39) Delays schedule execution for nominated time ms More Information Delay (P39) Note 6 some are writable System variable scaling factor System Variables (P40) CV Channel variables: general
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Category Channel Type PE Counter writable Internal Maintenance Default Channel Options Signal\ Sensor Details Channel Factor Output Units More Information Counts Phase Encoders (P340) Phase Encoder Temperature – Thermocouples (P315), and CEM20 Temperature Reference (P378) REFT Reference temperature of DT80 or CEM20 terminal block scaling factor degC VBAT Terminal voltage of internal 6V lead acid battery scaling factor V Battery flat if below 5.6V.
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This channel type is writable, so you can set the time by sending: T=12:20:00 Time can be in several formats, selected by parameter P39 as follows: P39= Format 0 (default) Hours:minute:seconds.subseconds 11:45:10.003 P41 controls the number of sub-second digits between 0 and 6; default is 3 digits 1 s.s (decimal seconds) since midnight 3 h.h (decimal hours) since midnight 2 Example 42310.003 705.1667 m.m (decimal minutes) since midnight 11.
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Internal Maintenance There are several internal maintenance channels, which are read in the same way as normal channels. These allow, for example, the terminal voltage of the DT80's internal batteries to be measured. See the Internal Maintenance section of the DT80 Channel Types table (P37). System Timers There are four internal reloading system timers, which are read in the same way as channels.
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In this case the SATTN and CATTN commands are used to turn the Attn LED on and off, rather than the 1WARN channel.  Delay Accuracy The actual delay will not necessarily be exactly as specified. For delays of 20ms or less it will be close (within 1ms). For longer delays the resolution is +/- 16ms however it is guaranteed that the duration will be at least the specified time.
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System Variable Function Notes 26SV Status of last NTP attempt 27SV 0 = no NTP requests have been attempted 1 = time adjustment in process 2 = last request successful -1..-5 = last request unsuccessful Time discrepancy as at last NTP request in milliseconds 29SV Status of last unload attempt 30SV 31SV 32SV 33SV 0 = no unloads have been attempted 1 = unload in progress 2 = last unload was successful -10..-19 = destination store file error -20..
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The same channel can be put in the list more than once, with the same or different channel options. The DT80 treats each occurrence as a separate measurement. A Special Channel Option — Channel Factor The DT80’s channel factor channel option is simply a floating point number. This number is interpreted in different ways depending on the channel type, as indicated by the following table. Channel Type V, HV, Tx, CV, SV, CALC, &name, MODBUS, SDI12, internal channels e.g.
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Order of Application The DT80 applies channel options in a specific order, regardless of the order in which they are specified in a channel definition. The channel option table below lists the channel options more or less in the order of application. In general terms, the ordering is as follows: 1. First, the raw value is sampled, taking note of sampling options, i.e. those relating to the physical measurement process.
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Category Channel Option Input T Termination (DT80/ 81 Series U 1 only) default Input Attenuators A NA default Resistance and Bridge 2W 3W default 4W Provides input bias current path to ground to prevent inputs "floating" – particularly when independent (differential) inputs are used. Not required on DT80 Series 2 or DT85 as a ground path is always present.
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Reset Channel Option Range of Option (n) Function Reset channel after reading Disconnect internal 100R shunt between # terminal and AGND Allows # terminal to be used for shared-input voltage measurements PT Force precise timing Valid for DELAY, DSO, WARN and RELAY channel types. Forces a precise (+/- 1ms) delay time even for long delays.
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Channel Option AD"n" SDI-12 Rnnn CM VERnn ADn AD"ip-addr" Rt:rrrrr:b Modbus MBtype MEorder TOn RTn MUIDn Serial Channel "commands" Rainflow Cycle Analysis RAINFLOW Mutual Excl Category Range of Option (n) Function Comment Sensor address (quotes optional 0-9, A-Z, a-z for 0-9) Register to read Configure sensor to measure continuously Only use commands supported by SDI12 version n.
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Variables See Channel Variables (nCV) (P67) Destination Output Data Format Channel name and Units Channel Option /=nCV =m..nCV (MODBUS channel only) Mutual Excl Category Range of Option (n) Function Divide channel variable by channel reading. nCV = nCV ÷ reading Comment time and not during statistical sampling. 1 to 1000 Assign values to a range of CVs NR No return Channels tagged with NR are not returned to the host computer (they may still be logged or displayed).
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Part C – Schedules Schedule Concepts What are Schedules? Schedules are the workhorses of the DT80.
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Schedule Name RA"Test1"("B:",DATA:OV:14D)2S 1TK 6R(4W) 7TT Schedule ID Schedule Name Schedule Options Schedule Trigger Channel List The schedule name is optional, and consists of text (max 20 characters) enclosed in double quotes. This name is used in reports and is normally used to document the purpose of a given schedule.
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 Default Schedule Options All schedule options are optional. Default settings are: • Destination is B: (internal flash drive) • New data and alarms overwrite earlier data/alarms once the store file fills • Space allocated for data is 1MB • Space allocated for alarms is 100KB • Space allocated for each logged alarm text string is 60 bytes.  Examples RA"Fred"(DATA:NOV:15D)15M Schedule A is given the name "Fred".
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 Example — Channel List The channel list 1V 3R 5..7DS 4TK("Boiler Temp") 3DSO=0 specifies the following channels (each is separated from the next by a space character): • • • • 1V — read analog input channel 1 as a voltage 3R — read analog input channel 3 as a resistance 5..
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Trigger on Time Interval Figure 8: Time interval schedule Report schedules can be triggered at regular intervals of time, determined by the DT80’s real-time clock.
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 Examples Trigger daily at 9:00am: RA[0:0:9] Trigger every Monday morning at 10:30am RA[0:30:10:*:*:1] Trigger at 4:00am on the first of every month RA[0:0:4:1] Trigger every 2 hours (same as RA2H) RA[0:0:*/2] Trigger every 2 hours, at 2 minutes before the hour (i.e 1:58, 3:58, etc.
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 Examples – Counter Event The following schedule will run on every 100th pulse received on high speed counter input 1C: RA1HSC(100) In this case counter 1HSC will count from 0 to 99 then reset to 0, at which time the schedule will trigger. This means that if you read the value of 1HSC within this schedule then it will generally always read 0.
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 Example The schedule RDX 1..3TK samples analog channels 1 to 3 as type K thermocouples (1..3TK) whenever the DT80 receives an XD poll command (that is, whenever it receives the character sequence XD) either from a connected computer, or by means of an alarm action from within the DT80.  Using Poll Commands with Standard Report Schedules Figure 12: Polling a time interval schedule A report schedule defined with a time or event trigger can also be polled by its appropriate poll command at any time.
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While clause :nW :n~W :m..nW :m..n~W :nCV :n~CV :m..nCV :m..n~CV Action Enable schedule while digital input n is high Enable schedule while digital input n is low Enable schedule while ANY digital input m to n is high Enable schedule while ANY digital input m to n is low Enable schedule while nCV is non-zero Enable schedule while nCV is zero Enable schedule while any of the channel variables n..mCV are non-zero Enable schedule while any of the channel variables n..
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Statistical Report Schedules Figure 16: Statistical and report schedules A report schedule can instruct the DT80 to return statistical information (average, SD, max., min.,…) for one or more channels. The DT80 does this by • scanning its input channels and executing calculations at frequent intervals of time, then • retaining intermediate values to produce a statistical data summary at longer intervals.
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 Insufficient Statistical Samples If no statistical data has been scanned before being reported, then the reported data value will be set to NotYetSet. This will also occur if insufficient samples have been taken – for example, the standard deviation (SD) option requires at least two samples to be able to return a value.
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The channels defined here will be sampled and reported in the following order: Time 12:00:00 12:00:01 12:00:02 12:00:03 12:00:04 12:00:05 12:00:06 ... Schedule Channel sampled S 2V Channel reported/ logged - A - 2V(AV) A - 2V(SD) A 1V 1V B 3V 3V S 2V * - S 2V * - B 3V 3V S 2V * - S 2V * - B 3V 3V S 2V * - A - 2V(AV) average of the 5 samples marked * A - 2V(SD) standard deviation of the 5 samples marked * A 1V 1V S 2V - B 3V 3V ... ... ...
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For example, if you enter RA1+E 1V HB SATTN 4CV=4CV+1 you might expect that when the schedule was triggered (by a positive going edge on digital input 1) it would measure a voltage (1V), halt schedule B (HB), switch on the Attn LED (SATTN) and increment a channel variable (4CV=4CV+1). In fact, the HB and SATTN will execute once only, when the job is entered. The 1V and 4CV=4CV+1 are channel definitions, so they will execute each time schedule A is triggered.
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Part D – Jobs What is a Job? A job is a collection of related schedule definitions and commands which together configure the DT80 to perform a particular data logging task. Several different jobs can be stored on the DT80's internal file system, but only one can be active at any one time. Each job has its own separate data/alarm storage area. Jobs are identified by their job name, which is a user-defined string of up to 8 characters.
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Loading an Existing Job The DT80 can also read job text from a file stored in its internal file system and automatically enter it. This job will then become the current active job, replacing whatever was previously the current active job. A new job may be loaded when: • • • the RUNJOB"jobname" command is issued. This will read the job from the file B:\JOBS\jobname\PROGRAM.DXC. the DT80 is reset. By default, the previously active job will be loaded (See Startup Job (P64)) A USB memory device is inserted.
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Job Commands A number of commands are provided for managing jobs on the DT80. Listing Job Names The DIRJOBS command lists the names of all jobs stored in the DT80 internal file system, e.g. DT80>DIRJOBS FRED *GEORGE + RON + GINNY UNTITLED An asterisk (*) indicates the currently active job, if any. Locked jobs are indicated by a plus sign (+). The CURJOB command simply displays the name of the current active job, e.g. DT80> CURJOB GEORGE Specifying Jobs The following commands act on a specific job or jobs.
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Startup Job The DT80 can automatically load a user-defined job every time it is restarted by a hard reset (HRESET command or power failure or pressing the manual reset button). This allows the DT80 to operate as a dedicated instrument. The DT80's behaviour following a hard reset is controlled by the following profile setting: PROFILE STARTUP RUN There are three possible settings for this profile: • • • CURRENT_JOB – the DT80 will reload the job that was active prior to the reset (if any).
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Part E – Manipulating Data Scaling Most DT80 channel types automatically scale measured values so that the returned values are in appropriate engineering units. For example, the thermocouple channel types (e.g. TK) automatically apply the appropriate scaling polynomial so that the data is returned in °C.
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Note1: in this case the default signal coordinates (0 and 100) are used, because the L (current loop) channel type returns a value in the range 0-100%. Once defined, a span may be applied to any number of channels in any schedules or alarms using the Sn channel option.
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• a, b, c are the constants from the above thermistor equation. If not specified, a coefficient value of zero is assumed • units replaces the channel's default units text Once defined, a thermistor conversion may be applied to any number of resistance channels using the Tn channel option. For example: T1=26.5,1.034,8.77e-3"K" RA1M 3R(T1,"Solvent temp") See also Temperature – Thermistors (P333).
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• any channel's value (e.g. a measured temperature) may be assigned to a channel variable by using the =nCV channel option • certain special channel options (e.g. histogram) return multiple data values, which are written to a specified range of channel variables. See Multi Value Statistical Options (P78). • data values read from a serial sensor using the generic serial channel type (nSERIAL) may be assigned to CVs. See Generic Serial Channel (P348).
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If you need a CV to count beyond 16,777,216 then you will need to use two CVs to hold the count value, e.g.: 1CV=1CV+1 IF(1CV>1000000){2CV=2CV+1 1CV=0} Naming Channel Variables As with any other channel type, CV channels can be given name and units strings using the "CVname~Units" channel option. The command NAMEDCVS will return a summary of all CVs that have been explicitly named, e.g.: CV S CV Name Value Units ========================================== 5 A Temp 89.1 Deg C 1 A Speed 23.
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 Options A reference channel is a channel in its own right so, like any other channel, it can have its own channel options. However, because a reference channel does not physically measure anything, sampling options will not be applicable. It can have reporting options, e.g. RA1S 1V("Voltage12") &Voltage12(Y1,"Pressure12~kPa") In the above example a voltage based pressure sensor is sampled. Both the raw voltage and the pressure (calculated by applying polynomial Y1) are returned.
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Operands: • An expression operand can be either • • • • • a numeric constant, e.g. 27 or -2.95 or 2.222e-6 or 0x3fff (hexadecimal) one of the special constants PI (3.1415927) or E (2.7182818) a channel variable, e.g. 17CV a reference to another channel, e.g. &1TK or &"Reactor Temp" a sub-expression in parentheses, e.g. (1CV+1) or (COS(D2R(3CV))+1). The sub-expression will be evaluated first and the result will become the operand. Operators The following operators are supported.
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Data Types  Integers and Floating Point DT80 channels can return either a 32-bit signed integer or a 32-bit floating point value. Digital and counter channels return an integer value; most other channel types return floating point values. The Type column in the above table indicates the data type that results from applying the specified operator.
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 Example 1 In this program, a vector average is calculated, because it is not meaningful to numerically average wind direction angles. The inputs are wind speed and direction. BEGIN"Wind-01" S1=0,50,0,1000"m/s" S2=0,6.2832,0,1000"radians" Y3=0,3.6"km/h" Y4=0,1"Deg" 3..
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Running Average A running average is a calculation to analyse data points by creating a series of averages of different subsets of the full data set. Is also called a moving mean or rolling mean and is a type of finite impulse response filter. Running average is used to smooth data by remove short term trends or noise from the data thus revealing longer term underlying trends Figure 18: Running Average as depicted in a chart The DT80 Can be to used to generate a running average of channel samples.
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Derived Quantities The DT80 can automatically compute various commonly used derived quantities such as differences, rates of change, pulse widths and so on. These are calculated by including the appropriate channel option, as detailed below. In each case the derived quantity is returned instead of the original reading. Rates and Integrals The following derived quantities are calculated based on the current and the previous channel reading.
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• • If a falling edge has occurred since the last reading on a channel, and another falling edge has occurred some time previously, then the TFF option returns the time interval between the two edges, otherwise it returns zero. If a falling edge has occurred since the last reading on a channel, and a rising edge has occurred some time previously, then the TRF option returns the time interval between the two edges, otherwise it returns zero.
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There may be fewer than expected samples in the first sample period after starting a schedule. This is because, by default, schedule execution is synchronised to midnight (see Time Triggers — Synchronizing to Midnight (P60)) so a one minute schedule will always execute on minute boundaries. If insufficient statistical samples have been taken at the time when the report schedule runs then an error message returned and the data value is flagged as "not yet set".
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Multi Value Statistical Options The statistical options described here are special in that they return multiple values. A channel can only have one return value, so these options work by setting channel variables. These channel options do not affect the usual reporting or logging of the channel’s readings. Histogram (Hx:y:m..
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The following three CVs will also be updated: • • • 16CV is the number of under-range samples (<25°C) 17CV is the number of over-range samples (>35°C) 18CV is the total number of samples (sum of 11..17CV) The B schedule will, when polled, report the current histogram data. Polling the C schedule will clear the histogram data.
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Summary data Example: 21..40IV c..dIV IV Contents c+0 c+1 c+2 Contains the count of cycles for the first cycle size class ⇓ ⇓ d–7 d–6 d–5 Contains the count of cycles for the last cycle size class Contains the count of cycles for the second cycle size class Contains the count of cycles for the third cycle size class Contains the count of cycles that over-ranged the maximum cycle size Contains the count of all cycles Contains the maximum buffered cycles 0..
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The rainflow report provides a complete summary of the rainflow data for the collection period. The cycle size range for each class, the number of cycles in each class, and the mean for each class is shown, as well as the summary data. Although the rainflow report cannot be logged in the DT80, the primary cycle count data used to make up the rainflow report can. For example, the program BEGIN"Rainflow" RA50T 2BGI(RAINFLOW:72:5:1..27IV,W) RB7D 1..27IV LOGONB END logs the histogram data every 7 days.
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Part F – Alarms Alarm Concepts DT80 alarms allow decisions to be made based on the magnitude of DT80 input channels, channel variables, timers, the clock/calendar, internal channels, system variables and so on. The decision is a true or false result of an alarm condition test. The true/false result is also known as the alarm state. The DT80 can be instructed to carry out actions when an alarm tests true.
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• • commsProcess is a mailto: or sms: URI that specifies a message to send by email or SMS. Multiple URIs can be included, each enclosed by []. (sms: is valid for DT8xM models only) {actionProcesses} is a set of channel definitions and/or commands to be executed if the alarm condition tests true (optional) These are explained further in the following sections. Note: the DO command is the same as IF except that the alarm condition is assumed to be always true.
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Some sample alarm conditions are shown below: Condition (2R(II)>51.5) (3+V(AV)<-200) ((CALC=(&1TK+&2TK)/2)<50) (4ST==1) (REFT<>-10,45) (T><9:00,17:30) (32SV>10000) (1CV<2CV/2M) (4DS==0) (1CV(ND)>1) Alarm is true if channel 2R value is greater than or equal to 51.
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Alarm Digital Action Channels One or two comma-separated digital action channels can be declared for each alarm. These channels will then mimic the state of the alarm.
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Substitution Characters Special substitution characters can be placed into actionText. These instruct the DT80 to dynamically insert the following information when the alarm returns and/or logs its action text: Alarm text ! !! where Substitutes the following DT80 serial number, :, alarm number Example 080035:8 time at which action text was returned (in P39 and P40 format) 12:13:14.
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 Text Labels The DO command in conjunction with alarm text provides a simple way to output a text string in a schedule, e.g.: RA5M DO"Boiler 1^M^J" 1TK 2TK DO"Boiler 2^M^J" 3TK 4TK DO"^M^J" will include a heading before each group of measurements: Boiler 1 1TK 239.4 degC 2TK 99.9 degC Boiler 2 3TK 212.4 degC 4TK 90.9 degC Alarm Communication Actions Alarm communication actions allow you to send the alarm action text (or other message) to one or more recipients via email and/or SMS.
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• priority is normal (default) or low. A normal priority message will be sent as soon as possible. Low priority messages are queued and will be sent at the start of the next communications session. Unlike email, if a session is already active then low priority SMS will still be deferred until the start of the next session (see below). • body is a string to use as the body of the text message. If not specified then the alarm action text is used.
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Order of Execution When an alarm is triggered, things happen in the following sequence: 1. 2. 3. 4. Digital action channels (if any) are set to the required value Alarm text (if any) is generated and returned/logged Email/ SMS communication actions (if any) are queued for transmission Any channels in the action process list are evaluated, left to right. All channels in an alarm process list are treated as working channels – they are neither returned, logged nor displayed. 5.
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 Trap – Don't Use DELAY Between Commands The DELAY=ms function is a channel, not a command. It therefore cannot be used to insert a delay between two commands. For example, if you wanted to light the Attn LED for 5 seconds to indicate that a measurement was about to be taken, you might try RA20M DO{SATTN; DELAY=5000; CATTN; XB} RBX 1V 'does not work! but this is no good because the DELAY, being a channel, is executed first, then SATTN;CATTN;XB in quick succession.
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For example, the job: BEGIN 1..3CV(W)=0 RA1S 1CV(W)=1CV+1 ALARM(1CV>3CV){XB 2CV(W)=2CV+1 3CV(W)=2^3CV} RBX LOGONB 1..5TK END logs data at increasing intervals as the experiment proceeds. The program calculates the next log point as an incrementing power of 2 seconds — that is, it logs the temperatures at t = 0, 1, 2, 4, 8, 16,… seconds. The following table lists the values of the three CVs at the point at which the ALARM statement is executed.
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Alarm Records Real Time Alarm Return If an alarm is triggered while free format mode (/h) is selected, the configured alarm action text (if any) will be returned. If an alarm is triggered while fixed format mode (/H) is selected, a fixed format alarm record will be returned. This has a similar format to a fixed format data record (see Format of Returned Data (P30)) For example, the job: BEGIN"B1" RB1S ALARM8(1V(S1)>1.
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Polling Alarm Inputs The current values of the channels being tested in alarm conditions can be polled (requested) by the host computer at any time.
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Part G – Logging and Retrieving Data Logging Data By default, the DT80 returns measurement data to a host computer in real time. However, the DT80 can also automatically record each reading taken for some or all of a schedule’s channels. These data are stored in the DT80’s internal memory, and can be retrieved at a later date, using a USB memory device or via one of the communications ports, or via the web interface (Series 2 only). Each reading is automatically timestamped.
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Store Files When a job is first entered, a directory (folder) is created on the internal file system: B:\JOBS\jobname. This folder contains files which record the job's program text and other details about the job. For each of the job's schedules that contain loggable channels (that is, channels which do not specify the NL or W options), a data storage sub-folder for that schedule is then created: B:\JOBS\jobname\sched. Finally, a store file is created in the schedules data storage folder.
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• logging preparation time – the time taken to generate a data record to be logged • file system time – the time taken to physically write the data to the internal flash disk or external USB device. The first three of these depend on the job and the logger settings. We can largely eliminate them by defining a job consisting only of CVs, and switching off real time data returns (/r).
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To determine how much space is available on the internal file system for creating new store files, see Checking Logging Status (P97). Because the store files are fixed size, a lack of free disk space will normally not be a problem once the job has been started successfully. If, however, the job is configured to log direct to a USB device, and the device is removed during operation, then a "Cannot log" error message will be displayed on the LCD and the Attn LED will start flashing.
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Retrieving Logged Data Overview There are several different ways to retrieve logged data from the DT80. • Use the Retrieve Data function in dEX. The graphical web-based interface allows you to select the desired time range, among other options. Data will be downloaded to your computer and saved as a CSV or DBD format file. • Interactively send a data unload command (COPYD) to the logger's command interface, which will output logged data in CSV, fixed or free format to the active communications port.
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Each row of the report describes a store. A store is a set of logged data or alarm records for a particular schedule. Each store is contained within a store file (.DBD file). There can be multiple stores in the one store file. There are two different types of store file: live (Live) and archive (Arc).  Live Store Files Live store files are the files to which data and alarm records are written, as they are sampled. Each schedule (that has loggable channels) has a live store file called DATA_s.
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Orphaned live store files should normally never occur, because the DT80 will refuse to load a job if logged data exists that was generated by a different job with the same name. Note however that any archive files that may be lying around are not checked, so if you change the contents of an existing job then its archive files will become orphans.
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For example, if you are only interested in alarms: LISTD data=n Job ======== *SAMPLE *SAMPLE Sch === B B Type Ov Lg Go ========== == == == Alarm Live Y Y N Alarm Arc First =================== 2010-03-01 09:54:40 2010-03-01 09:54:40  Live and Archive Files Recs ======== 3 2 Last =================== 2010-03-11 19:32:00 2010-03-01 09:54:48 Capacity ======== 1455 2 — File =========================================== B:\JOBS\SAMPLE\B\DATA_B.DBD B:\JOBS\SAMPLE\002_20100311T193043.
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The COPYD command supports many options, which are used to: • select the data or alarm stores from which you wish to unload, • select the range of data records to unload, • select the format you want it in, • select where you want it to go, and • select what to do with the source data after it has been unloaded Selecting the Stores to Unload The first group of COPYD options are used to select the set of data/alarm stores from which to unload.
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Calculated times can be specified by replacing either or both of the date and time parts with channel variable references, mCVT hh:mm:ss.tt or yyyy-mm-ddTnCV or mCVTnCV If a channel variable is used for the date part then the CV value should be in seconds since 1-Jan-1989. The current date, in seconds since 1-Jan-1989, can be obtained using D(=mCV). If a channel variable is used for the time part then the CV value should be in seconds since midnight.
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 Step Size If you have a very large data set on the logger then it may take considerable time to unload. The step= option allows you to download a smaller sample of data points so that you can get a quick overview of the data. To use this feature, specify step=interval, where interval is the required minimum time interval between successive samples. For example, the following schedule executes every 100ms so it will log 864,000 samples per day (approx.
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• schedule A data values • schedule A alarm values It is also possible to unload to separate files, by adding an option: COPYD job=* archive=Y dest=a: merge=N This will then create output files similar to the following: A:\SN081234\JOBS\ECHIDNA\001_20100313T181008_J.CSV (J data from live store file) A:\SN081234\JOBS\ECHIDNA\002_20100313T181008_K.CSV (K data from live store file) A:\SN081234\JOBS\ECHIDNA\000_20091225T123409_J.
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 FTP Server The DT80 is also able to unload data to files on a remote server, using FTP (File Transfer Protocol). An FTP transfer is initiated by specifying an FTP Uniform Resource Identifier (URI) as the value of the dest= option.
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 Email Unloads can also be sent via email. In this case the data file is included as an attachment to the email. Specifying an email destination is similar to FTP, except that a mailto: URI is used. This has the form: mailto:recipient-email?priority=priority&subject=subject&body=body&interface=interface where: • recipient-email is a comma-separated list of up to 5 email addresses in the usual format (e.g. jake@peg.edu.au).
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 URI Escape Characters If any of the following characters are used within an FTP or email URI component (FTP user name, FTP password, FTP folder or file name, email recipient, email subject or email body), after applying any replaceable parameter substitutions, then they must be replaced with "escape sequences", as follows. This prevents them being confused with the characters used to separate the various parts of a URI.
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COPYD Option Summary The following table summarises the available COPYD options: Option Value Description Default Value Store selection options job= sched= data= alarms= live= archive= src= path= jobname * Unload specified job only (none) Unload current job only schedule-list Y/N Y/N Y/N Y/N drive-list folder-path\ file-path Unload specified schedules only (none) Data Range options yyyy-mmddThh:mm:ss.tt -ddThh:mm:ss.
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Aborting an Unload The Q (quit unload) command can be used to abort all current and pending COPYD unloads. It has no effect on unloads initiated via the Retrieve Data function in dEX. Note: this command will not prevent queued unload data files from being sent via FTP or email during a communications session. The only way to prevent transmission of already queued files is to clear the queues using the SESSION CLEAR command.
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 Multiple Network Interfaces In this example, a DT8xM is configured to perform regular daily data unloads to an FTP server on the local Ethernet LAN, which does not have an Internet connection. In the event of an alarm condition, however, the modem interface (which is the default) is used to send an email alert. BEGIN"LYREBIRD" RA2S IF(1TK(LM,"Ambient")<>5,35)[mailto:alert@womble.org] RB1D DO{COPYD dest=ftp://cat:dog@10.33.112.
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Option end= Value Description mCVTnCV date and time parts of timestamp given by mCV and nCV new Delete records logged prior to the last unload of this store with the same id value new2 id= integer Delete records logged prior to the second-last unload (excluding start=new2 unloads) of this store with the same id value Arbitrary user identifier for tracking last unload time Default Value 0 Deleting Store Files  Deleting Jobs A job's store files are physically deleted when the job is deleted usin
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By contrast, COPYD dest=A: REMOVEMEDIA will likely cause various error messages to be returned, because the REMOVEMEDIA will execute in parallel with the COPYD, causing the memory device to be shut down prematurely. Simultaneous Unloads Because of Rule 2 above, only one COPYD command can execute at any one time – if you or your job tries to start a second then it will remain pending until the first unload completes.
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The DT80 File System Internal File System (B:) The DT80 uses a Windows compatible FAT16/FAT32 file system for storing logged information (data and alarms) and system information. The internal file system uses flash memory, so all files will be preserved even if the DT80 is reset or loses all power. The size of this file system for a standard DT80 is 128Mbyte or the latest models have 2Gbyte storage.
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Notice: DT80 related files are always stored in a subtree whose name is based on the DT80 serial number. This allows data from a number of different DT80s to be collected on the one USB device.
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To safely remove a USB device, you should always first issue the REMOVEMEDIA command. This command is also one of the default options on the front panel function menu (P121). This command will: 1. suspend logging for any schedules that are configured to log directly to the USB memory device. This will cause an error message to be returned, and the Attn LED will start flashing 2. make sure that all required information has been fully copied to the device and all files are closed 3. shut down the device.
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• always use the REMOVEMEDIA command before removing the memory device if there are schedules logging directly to the USB device Note: the DT80 provides some protection against gradual power failure (e.g. the internal battery becoming discharged). If it detects that the supply voltage is becoming critically low, the DT80 will automatically close all store files and force the unit into low power Sleep Mode (P300). The DT80 will remain asleep until the power supply recovers to an adequate level.
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Part H – DT80 Front Panel The DT80 front panel user interface comprises: • a 2 line by 16 character back-lit liquid crystal display (not DT81) • 6 keys (not DT81) – Up, Down, Left, Right, Cancel/Func and OK/Edit • 4 status indicator lights (3 for DT80 Series 1) – Sample, Disk, Attn and Power The display provides information about data logger status, channel data, alarms and store operation. In addition the display will indicate conditions that require attention and USB memory device status.
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The following "screens" will then be available. These can be scrolled through using the Up and Down arrows on the keypad. Pressing Down Display screen Comments DT80 V9.00 MYJOB The default "sign-on" screen indicates the DT80's firmware version number and the name of the currently loaded job (No current job is displayed if there isn't one) Date: 23/10/2009 Time: 16:44:02 Current date and time (format can be changed using P31 and P39) Battery: -290mA Internal battery status.
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Auto-scrolling The DT80 may also be configured to automatically scroll through the channel display screens. This is useful in applications where the DT80 is mounted behind a glass panel – the display is visible but the keypad is inaccessible. To enable auto-scroll set the following profile: PROFILE DISPLAY AUTOSCROLL_INTERVAL=10S which in this case will automatically switch between channel display screens every 10 seconds. If this profile is set to 0 then auto-scroll is disabled.
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User Defined Functions Not applicable to DT81 The user can define up to 10 named macros called functions. These functions can be executed by the user via the LCD and keypad of the DT80.
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Keypad operation Not applicable to DT81 Direction Keys The up and down direction keys allow scrolling through the available channels, alarms and status screens on the display. When the function list is shown, then the up and down direction keys allows scrolling through the list of available of functions. When entering the SIM PIN/PUK code via the keypad the left/right direction keys select the digit and the up/down keys change the value.
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Unexpected Reset A message such as the following may be displayed following DT80 reset, in conjunction with a flashing Attn LED. Press any key to clear the message and the flashing LED. Display Comments DT80 restarted Power loss The DT80 lost power, both external and the internal battery. This message may also be displayed if the hardware reset button (accessed using a paper clip) is pressed.
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Part I – dEX What is dEX? The DT80 provides an embedded web interface (dEX) that provides simple, intuitive access to the logger’s operations using a standard web browser. You can view current sensor readings, job status and access data and other files stored in the file system. The standard web interface is built into the logger’s firmware. It does not need to be installed on the logger or on your PC. Simply use your existing browser to browse to the logger’s IP address and the home page will be displayed.
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For Series 2 or later loggers, you have the choice of running either dEX or the classic interface. The first screen you will see after browsing to the DT80's IP address is the Logger Home screen, as shown below. Figure 22: dEX home page The Logger home page provides four options, which are organised into two tabs. With the High speed connection tab selected, you can: • click Configure the logger to launch the dEX configuration builder.
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Note2: If you press the Refresh or Reload button on your browser then the above process will be repeated. That is, the application will be re-downloaded and will then restart at the Welcome page. Most screens within the web interface application include an Update button – use this button (not the browser Refresh button) to update displayed information.
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The following screenshot shows the general configuration builder screen layout: Figure 23: Typical configuration builder display Tree View The area on the left of the screen shows a tree view of the current configuration. As configuration elements (channels and schedules) are defined, entries are added to the tree view. This part of the interface thus gives an overview of the configuration, showing which channels belong to which schedules.
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Menu The menu bar across the top works in the same way as the menu bar in any other window-based application. Note that many of the menus have cascading sub-menus, as shown in the screenshot. Figure 24: Add measurement menu Six menus are provided: • The File menu is used to clear the current configuration or load an existing configuration, which may be either the logger's current configuration or a locally saved file.
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Figure 25: Schedule configuration Schedule Trigger By default, the configuration builder sets a new schedule to a 5 second trigger. To change this time, simply alter the indicated number and/or time units.To define a daily trigger at a particular time of day, select the Daily at option. To define other types of schedule trigger (e.g. event triggered, manual trigger), click on Advanced Triggering, which will cause more controls to appear.
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Managing Schedules To add a new schedule, select the Add menu, then Schedule. This will add a new entry to the tree view, and display it with the name editable. Enter a name for the schedule then click the green tick. To change the priority order of schedules, select a schedule on the tree and use the up/down arrow buttons at the bottom of the tree view to move it up or down. Note that if the schedule order is changed then the schedule identifier (A, B etc.
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 Scaling The Scaling tab is where you define either a simple scaling factor (channel factor), or a span or polynomial. Selecting "Spans and Polynomials" will bring up a list of defined spans and polynomials on the left hand side. Clicking on an entry will show its details in the area on the right. Figure 27: Defining a polynomial Initially, no spans or polynomials will be defined. To add one, click the Add button, select Span or Polynomial, then enter the required coefficients.
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For example, if the statistical schedule rate is set to its default of 1 second, and the above channel's schedule is set to its default rate of 5 seconds, then the sensor will be sampled once per second. Every 5 seconds it will log the instantaneous value of the sensor, plus the average, minimum and maximum, calculated over the previous 5-second period. For each selected statistical value, an automatically generated channel name is used (e.g.
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In DT80 parlance, the former is an IF channel, while the latter is an ALARM. The Output text field specifies the alarm text, which will be logged to the schedule's alarm store when (or while) the alarm is triggered. Special "substitution characters" can be included, which will cause the DT80 to insert certain dynamic values. In the example above, the ?V and ?U sequences will be replaced by the channel value and units respectively.
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For digital outputs, the channel number is selected by choosing the appropriate wiring diagram, rather than setting a separate control (as is the case for analog channels). The controls in the lower part of the properties pane select whether the control output state should be on, off, set according to a CV value (on if the CV is non-zero, off if it is zero) or inverted. You can also specify that the output should be pulsed – that is, set to the specified state for the indicated time, then inverted.
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References are useful in alarms. You can define multiple alarm channels, all of which are testing a reference to a single measurement against different setpoints. Note: Reference channels cannot be added to the On Logger Activation (immediate) schedule, and channels in the On Logger Activation schedule cannot themselves be referenced.  Calculation A calculation channel gets its value from a mathematical expression, which may include references to other measurement channels.
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 Delay The Delay channel inserts a fixed delay between the execution of the channels immediately above and below it in the tree view.  Manual Channel This channel type allows you to manually define one or more channels. It is useful for situations where the configuration builder does not directly support the DT80 channel type you wish to use – for example the generic serial channel (SERIAL).
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Time and Date The Time and Date page contains time related settings: • The Time zone control must be set if you are using NTP to synchronise the DT80's system time; see Automatic Time Adjustment (NTP) (P270). If NTP is not used then this does not need to be set. Note that the city names are provided as a guide only, and do not take daylight savings into account. • A button is provided for setting the logger date and time. The same function is provided on the Logger menu.
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Serial Port Controls The three DT80 serial ports (USB, host RS232 and serial sensor) are configured in a similar way: Each has its own page of controls. • On the USB port page (not present on DT82 models), there is only one setting: the port function, which specifies whether the port should be used for command/PPP, PPP only, serial sensor or Modbus. You can also disable the port. See Configuring the USB Port (P187).
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Modem DT8xM models only This page contains settings for the integrated modem. The page is divided into four tabs: • The General tab contains basic connectivity settings. If the SIM has a PIN set then it must be entered here. • This is also where the Access Point Name (APN) is set. The DT80 includes a list of APNs used by certain mobile carriers. If one of the "set by SIM" options is selected then the DT80 will attempt to locate the correct APN settings based on the inserted SIM card.
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WiFi Email DT8xWmodels only See WiFi Email (P243) for more details. Advanced The Advanced page lists those profile settings that are not covered by controls on the previous pages. These profiles are less commonly used. Refer to Profile Settings (P264) for information on all profile settings. Figure 36 shows a typical Advanced settings display. Note the following points: • To change a value, click on it and type the new value.
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Controls vs. Profiles The following table summarises the mapping between the controls described in this section and the DT80 profile settings, which are discussed in Profile Settings (P264) and throughout this manual. Category Control Site information Name Default Equivalent command language setting and default PROFILE USER SITE= Mains frequency 50Hz Temperature units °C Decimal point char Standard Time zone 0 Use NTP no NTP server 0.datataker.pool.ntp.
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Category Ethernet Email Control Default Equivalent command language setting and default From email your.logger@datataker.com PROFILE ETHERNET_SESSION RETURN_ADDRESS= your.logger@datataker.com SMTP server Username Password From name Modem Email From email your.logger@datataker.
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Managing Configurations Common Tasks The File menu is where you manage the logger configurations that you create with the configuration builder.  Backing up Configurations You can save the configuration that you are working on to your computer using the Save to disc... option on the File menu. By default, dEX configuration files have a .dEX file extension. Likewise, you can open a saved configuration by selecting Open from disc...
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Configuration Files Figure 37: How dEX stores configuration information The above diagram summarises how configuration details are stored. Notice that: • dEX saves your configuration to the logger as (1) an XML file (config.xml); (2) the equivalent logger command language file (config.dxc), which the logger then interprets in the usual way in order to set up its schedules and channels; and (3) the set of profile settings. • dEX retrieves the configuration from the logger by reading back the config.
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dEX Web Interface Using the Web Interface The following screenshot shows the Monitor the Logger screen layout: Figure 49: Welcome Screen The DT80 web interface comprises the following main elements: • The large properties pane on the right hand side is used to display various "screens" of information. Its contents will change depending on which screen you select. • The menus on the left hand side are used to select which screen to display.
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Status Screens The Status menu allows you to select one of five different screens, each showing useful information about the current status of the DT80. Welcome Screen The Welcome screen, as shown in Figure 49, is the first screen displayed when the web interface is started. It includes the following basic information about the connected logger: • name of the currently loaded job, if any • current date and time, according to the DT80's real-time clock. Press Update to update the display.
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amount of space will be used regardless of the actual number of data points or alarms that have been logged (see How Data and Alarms are Stored (P94)). If there is no current job loaded then this segment will not be present. • • Other job(s) (dark blue) – space used by other jobs which have previously been defined but which are not currently active. If these jobs and their logged data are no longer required then this space can be recovered using the DELJOB command (see Deleting Jobs (P63)).
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The Diagnostics screen provides functions which may be helpful when diagnosing a problem with the DT80. You can: • display the event log, which records events such as resets and power failures (Event Logs (P276)) • execute a self test, which verifies correct hardware operation (TEST Command (P275)) • generate a full service report. This includes the above items, plus several other details regarding the state of the logger (SERVICEDATA Command (P277)).
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Specifying the Data Range  Time Range The range of data to be retrieved is specified using the control at the top of the screen. The options are as follows: • All (which is the default) will retrieve all available data/alarms. The displayed start and end times indicate the approximate time range that will be retrieved. Press Update to update these values. • Range allows you to specify an explicit date/time range.
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CSV Data Format By default data and alarms are returned in standard Comma Separated Value (CSV) format. The file consists of a number of rows. Each row is terminated by a CR-LF sequence. Each row consists of a number of fields (columns), separated by commas. (Semi-colons (;) will be used if the DT80 has been configured to use a comma as the decimal point character). Each row consists of the following fields, in order: • • • timestamp (e.g. 2007/12/15 20:49:45.905) timezone.
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The Channel List screen lists all channels defined in the current job. For each channel, the following information is displayed: • Run – if green then the channel's schedule is running • Name – channel name • Value – channel value as at the last update (press Update to immediately update all values) • Units • Alarm – If the channel is an alarm channel (i.e.
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 Types of Mimics Eight different types of mimics are available: • Dial Meter – a pointer which moves across a graduated scale • Bar Graph – a variable height vertical bar with a graduated scale • Thermometer – a bar graph in the shape of a bulb thermometer • Compass – a circular compass display for indicating a bearing in degrees • Digital Panel – a numeric display, similar to a digital panel meter • LED – simulates a single or bi-colour LED • State Indicator – indicates one of two states usin
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Figure 46: Dial meter mimic screen For a given mimic type, the configuration settings may include: • Variable to display – specifies the channel to display • Custom variable label – the name of the channel (as set on the logger) can be overridden here • Update Rate – specifies how often the mimic will request an updated channel value from the logger • Units – this text string will be displayed in the lower right corner.
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Trend Chart Mimics  About Charts The trend chart mimic is the most sophisticated of the mimic types. It can retrieve historical data from the DT80 and plot one or more channels on a "chart recorder" type display. Figure 47: Trend chart mimic Up to 5 different channels can be plotted on each chart mimic, and up to two Y axes can be defined. The above screenshot shows a typical chart mimic shortly after the job was started.
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• Select the mimic reload rate, i.e. the rate at which new data will be requested from the logger. There is no point setting this any faster than the logger's sample rate for the schedule • Press Create mimic After creating the mimic, you can change any of these settings by clicking the chart mimic's Configure button to bring up the chart configuration dialog. You are also able to set the trace colour, as well as the Y-axis scaling and labels.
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The DT80's statistical functions can be used to aggregate measurements. For example, the following DT80 program will sample a temperature every minute, then at the start of each hour calculate the average of the previous hour's readings. RS1M RA1H 1TK(AV,"Ave temp") This average is then suitable for plotting using a bar chart mimic, with the time window set such that the time per bar is 1 hour. Slideshow Mode Slideshow mode will automatically cycle between selected mimic pages.
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This window lists all defined mimics and chart traces. If a channel with matching name was found in the new configuration (as is the case for the 1CV panel meter and chart trace) then the mimic is displayed in green and the mimic is automatically remapped to the matching channel. If there is no channel with the same name in the new configuration then the mimic will be displayed in red.
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Sending Commands Once the command window has been enabled, you will be able to type standard DT80 commands into the lower Send pane. Controls will be familiar to DeTransfer users: • Entered text is not sent to the logger until you press Enter or click one of the "Send" buttons • Press Enter to send to the logger all text on the line on which the cursor is positioned.
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Help These screens provide: • some general tips on using the web interface • links to documentation files (user manual, release notes, etc.) stored on the logger • links to useful resources on the dataTaker web site (www.datataker.
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Customising the Web Interface Overview Several aspects of the enhanced web interface can be customised to suit site requirements: • Selected menu items can be disabled to help prevent unauthorised or accidental changes to the logger configuration. For example, access to the Command window can be removed. • Up to 20 mimic screens can be defined, each with up to 16 mimics.
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Measurement menu The settings on the Measurement menu page allow you to: • create or delete mimic pages. • disable the List all channels menu item in the web interface (which displays channels and values in tabular form) Figure 54: Customising Mimic page By default, the web interface provides two mimic pages. The first has space for up to 6 mimics arranged as 2 rows x 3 columns, as depicted in Figure 44. The second has two wide mimics, suitable for chart displays.
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Help menu This page is similar to the Measurement menu settings page, in that it allows you to disable some or all of the standard help pages (that is, disable some or all of the items on the web interface's Help menu) Custom help example b:\www\flash\customHelp\customHelpExample.html is no longer accessible from this menu, but the file is still available in the memory.
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Preventing Configuration Changes Once the web interface has been fully configured, you may wish to remove the configuration tool option from the Logger home page, so that it is no longer accessible to everyday users. To do this, rename the folder b:\www\needa, which contains the configuration tool. You can use the command interface: RENAME b:\www\needa b:\www\needa_hidden (If entered using DeTransfer, use \\ rather than \.
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dEX User Roles There are three user roles in dEX • Data Supervisor This role have a limited access only to Monitor the Logger menu which allow them to view logger status, download or delete data. No programming function as they cannot access Configure the Logger menu or sending a new program via Command Interface. And since there is no access to Customised dEX menu, it is not possible to change the display inside Monitor the Logger page including changing mimic page properties.
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Adding/ Editing dEX Users (within Administration Right) dEX Administator users can add and maintain other users. Once security is turned on In the Customise dEX section a new menu item becomes available. Use the new User Maintenance screen to administer the user accounts you require. You can add up to five user accounts. Once you have added the fifth user the + User button is removed from view. Figure 61: User maintenance screen New users require a valid email address. The mobile field is optional.
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dEX Languages Change Language Language in dEX can be changed by selecting Language menu in Customised dEX. This menu will normally available because as a default User Level Authentication is disable. However when User Level Authentication is enabled, Language menu only available for Configure Logger User and Administrator role (See dEX User Roles (P164)). Figure 63: French language setting If someone with Data Supervisor role want to change their language, it will be available in the logging screen.
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Classic Web Interface The DT80 classic web interface is standards compliant which helps to make the interface accessible from a wide variety of web browsers. It has also been designed to be usable even on small-screen devices such as PDAs and mobile phones. For advanced users, the web interface can also be customised by developing new web pages and loading them onto the DT80's internal file system. Browser Requirements The web interface uses a minimum of browser functions to provide its interface.
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Channels Page The Channels page displays a table listing all channel entries defined for the current job. This table shows the most recent measurement for each channel, along with the time that the measurement was taken. Note that any channels defined as working channels (W channel option) will not be included. Figure 67: Channel Page The Channels page is updated every 30 seconds. The time at which the table was last updated is displayed on the topright corner of the channel listings table.
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Files Page The Files page provides the ability to view files stored on the DT80's file system. Direct links are provided for the system event and error logs (see Event Logs (P276)), and the remainder of the file system can be browsed using FTP. Figure 69: Files Page To view a log file, simply click on the desired log file link. The log file will then be displayed. Click on the Back link to return to the Files page.
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Customising the Classic Interface This section describes some of the technical features of the DT80 web interface. These allow advanced users to replace the built-in web interface with a customised web user interface. Web Application Programming Interface (API) The DT80 provides an application programming interface (API) so that you can build custom web pages that can view and display data from the logger. The API consists of a set of server-side include (SSI) directives.
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#echo Directive This directive inserts a specific piece of information into the HTML page. SSI Directive Description Inserts the current date. e.g. 2006/05/02. Inserts the current time. e.g. 11:45:23. Inserts the model number of the logger. e.g. DT80. Inserts the value of channel variable nCV. The (FFd) part is optional, and specifies the number of decimal places to display (default is one decimal place) e.g. 23.4.

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Sample HTML output generated by the #channeltable directive is as follows:

Schedule	Name	Value	Units	Timestamp
A	1V	1.234	mV	2006/04/07 12:12:11
A	Geyser Temp	122. PAGE 173 #include Directive This directive is used to insert the contents of another file into a HTML page. SSI Directive Description Inserts the contents of the file rel-file (specified as a relative path, e.g. footer.htm) into the current HTML page. Inserts the contents of the file abs-file (specified as an absolute path, e.g. b:\events\event.log) into the current HTML page. The #include directive may be nested, i.e. PAGE 174 The SHTML mark-up for this page is as follows: My Custom dataTaker Web Page My Custom dataTaker Web Page Job Name: Schedule Name: Channel Variable (1CV): Notice the SSI directives (red). Note: The SHTML page filename must be saved with the following extensions:- .shtml, .shm or .sht. PAGE 175 Part J – Modbus Interface About Modbus Modbus is a simple communications protocol which is widely used in SCADA (supervisory control and data acquisition) systems. Modbus provides an efficient and standardised way to transport digital states and data values between a remote terminal unit (RTU) or programmable logic controller (PLC) and a supervisory computer. Servers and Clients In a Modbus-based SCADA system, each RTU/PLC acts as a Modbus server, or slave. PAGE 176  Serial Sensor Port The serial sensor port can be used to connect to a Modbus client via a multi-drop (RS422/ 485) or point-to-point (RS232/ 422/ 485) link. In order to use Modbus on the serial sensor port it is necessary to set the port function, as follows: PROFILE SERSEN_PORT FUNCTION=MODBUS You may also need to configure the baud rate or other serial parameters to suit the system to which you are connecting. PAGE 177 Furthermore, it is common for the different register arrays to overlap. In the example device mentioned above, the 16 coils and discrete inputs may actually refer to the same physical hardware – in this case 16 bi-directional I/O pins. So for this slave device, if a client wrote a "1" to coil 0:00007, it would then read the same value back if it did a read from discrete input 1:00007. PAGE 178 There are, however, a number of options for dealing with data values that cannot be represented by a 16-bit integer value: • the register can be treated as an unsigned 16-bit integer (0-65535) • the value can be scaled, typically by a power of ten, to give the required precision or range. For example a scaling factor of 100 would permit values in the range -327.68 to 327.67 to be returned • multiple registers can be combined to return a single larger value, e.g. PAGE 179 If a Modbus client then requests input registers 3:00007-3:00012 it will receive the following raw data: Register Value (hex / decimal) 3:00007 47AE Comments 3:00008 41BF 3:00009 BF7E / 49022 490.22 multiplied by scaling factor (100) 3:00010 FFFF / 65535 overflow: 921.0 x 100 = 92100 is too big for an unsigned 16-bit integer 3:00011 0001 / 1 3:00012 2710 / 10000 The 32-bit value 41BF47AE is the IEEE754 representation of 23. PAGE 180 This job sets up the following CVs for access by the Modbus client: 1CV, 2CV and 3CV contain the three measured temperatures. A scaling factor of 10.0 is applied so that it can • be returned with one decimal place (range -3276.8 to +3276.7) • 4CV is designed to be accessed as an output register, i.e. the Modbus client writes to it. This channel variable is used as the temperature setpoint, so it is scaled in the same way as the other temperature CVs. PAGE 181 So the setup for this application might be something like: Mimic Element Modbus Reg Data Type Device Range Display Range Units Comments "temp1" 3:00001 signed 16-bit -3276 to 3276 -327.6 to 327.6 degC 1CV (input reg) "temp2" 3:00002 signed 16-bit -3276 to 3276 -327.6 to 327.6 degC 2CV (input reg) "temp3" 3:00003 signed 16-bit -3276 to 3276 -327.6 to 327.6 degC 3CV (input reg) "setpt" 4:00004 signed 16-bit -3276 to 3276 -327.6 to 327. PAGE 182 Part K – Communications Overview The DT80 is very flexible and provides many communications options. To understand how these fit together and what combinations are possible, it is helpful to think of communications in terms of the following hierarchy: • Clients are software programs (e.g. a web browser, or the job running on the logger) that initiate communications to or from the DT80. • These clients use services that are provided by the logger (e.g. web server, command interface). PAGE 183 • PPP (point to point protocol), which allows a TCP/IP connection to be established over a serial link. This then provides similar capabilities to the Ethernet port, i.e. all TCP/IP-based protocols can then operate using this link. On DT8xM models, the DT80 uses PPP to connect to the mobile network. On standard models, the DT80 implements a PPP server on the serial ports. A PPP client (e.g. PAGE 184 Figure 71: DT80 communications options UM-0085-B09 RG DT80 Range User Manual Page 184 PAGE 185 Figure 72: DT80 communications options (integrated modem models) UM-0085-B09 RG DT80 Range User Manual Page 185 PAGE 186 The Command Interface Connecting to the Command Interface As shown in Figure 71 (P184), the command interface can operate over a serial link ("serial command" protocol), and/or over a TCP/IP network ("network command" protocol). PAGE 187 Setting and Removing the Command Interface Password Set a password by sending PASSWORD="password" to the DT80 password can be any text string of up to 10 case-sensitive characters. Remove a password by sending PASSWORD="" Note: The password is cleared if the DT80 performs a hardware or HRESET reset. Accessing Password-Protected Command Interface To establish communication at any time, simply send the password followed by a carriage return. PAGE 188 Figure 73: Using DtUsb to communicate with the DT80 over USB Note: only one of these interfaces can be active at any one time. By default, the TCP/IP interface will be active, so when the logger USB cable is plugged in, the logger will then become visible at IP address 127.1.1.1 (this address may vary). If, however, you shut down the TCP/IP part of DtUsb then the logger's virtual COM port (shown as COM6 in the diagram) will become available. See USB Direct Serial Mode (P192). PAGE 189 3. Select DT80 range... 4. Select Install USB driver 5. DtUsb actually consists of two parts: DtUsb Driver (the low level "plug and play" USB driver) and DtUsb (which provides the TCP/IP interface). Both of these will now be installed, starting with DtUsb Driver. PAGE 190 6. After the drivers have been copied to your computer a confirmation screen similar to the following will be displayed. Check that two green ticks are displayed. Click Finish 7. The DtUsb installer will now start. If you are installing from the CD and do not have .NET 2.0 or later on your computer it will now be installed (after you accept the Microsoft license agreement), then the DtUsb installer will continue. (If you are using a downloaded DtUsb package then the installer will terminate if . PAGE 191 9. Now connect the DT80 to the computer using the USB cable. This will trigger the Windows "plug and play" process to complete driver installation. You may notice a flurry of activity in the system tray area. The actual sequence of events depends on your operating system. • For Windows XP, the drivers that you pre-installed in Step 5 will be automatically installed with a minimum of fuss. PAGE 192 • Quit will terminate DtUsb, which will mean that the logger's TCP/IP services will no longer be available. This should normally only be used if you wish to use the direct "COM port" interface to the logger, rather than the TCP/IP interface. • Hide will close the GUI, but DtUsb will keep running. Closing the window with the red X button will do the same thing. • Apply will apply any changes you have made on the Configuration tab. PAGE 193 Figure 76: Determining USB COM port number in Device Manager Note: DtUsb must still be installed (but not running) in order to use the USB port in direct serial mode. If it is not installed then the DT80 will not be recognised and a COM port will not be assigned to it. Sleep Mode If the DT80 enters low power sleep mode then its USB interface will be reset. To the host computer, it will look like the USB cable has been unplugged, so the configured COM port will disappear. PAGE 194 Software Flow Control In this mode, the receiver controls the flow of characters by transmitting • the XOFF character (ASCII 19) to stop the sender from sending further characters • the XON character (ASCII 17) to allow the sender to resume sending characters. If the DT80 receives an XOFF character, it will stop transmission within two character periods. If no XON is received within 60 seconds (see PARAMETERS P26 (P260)) the DT80 will resume transmitting anyway. PAGE 195 Host RS-232 Port Not applicable to DT82EM/ 80LM/ 85LM The DT80 has a 9-pin male connector for RS 232 serial communication to a computer or modem. The port is configured as a DTE (Data Terminal Equipment) device, and the pinout is the same as that used on a PC. See RS-232 (P392) for more details. Configuring the Host RS-232 Port There are three parameters that need to be set for any RS232 port, and the DT80's port is no exception: • baud rate (data transfer rate in bits per second) DT80 default is 57600. PAGE 196 Port Function The possible settings for the host port FUNCTION parameter are: • • • • • • COMMAND (default) – the port accepts DT80 commands sent directly over the serial interface. The port will automatically switch to PPP mode if an incoming PPP connection is detected. When the PPP connection is closed the port will go back to accepting direct commands. PPP – the port accepts PPP connections only. SERIAL – the port is controlled by the current job, using the 2SERIAL channel. PAGE 197 Connecting to the Serial Sensor Port The DT80 serial sensor port terminals have different functions depending upon the configured serial standard (RS232, RS422 or RS485). PAGE 198 RS485 Connection RS485 uses half duplex differential signalling: there is just one pair of wires, which is used for both transmit and receive. Be sure to observe the correct signal polarity, as shown in the diagram. Some devices label their terminals as A or B, some as + or –. Notice that with RS485, all devices including the DT80 are wired symmetrically: there is no distinction between "master" and "slave", at least from a wiring perspective. PAGE 199 If required, these settings can be changed using individual PROFILE commands. See Profile Settings (P264)) for details on the possible values for these settings. PAGE 200 External Modem Not applicable to DT8xM models Modem (Remote) RS 232 Connection Another common way of communicating with the DT80 is to connect its Host RS 232 port to a wired or wireless modem, which communicates with another modem connected to the host computer at the other end of the comms link. This way, the DT80 can be across town or across the world from the host computer, and the link can use PSTN (landline), radio, GSM (cellular) or satellite communication. PAGE 201 Modem Initialisation Configuring Your Modem Modems are highly configurable devices with many different parameters that can be adjusted. To make this long list of parameters easier to manage, modems normally support a number of different configuration profiles. Each profile consists of a complete set of parameter values. As a minimum, there would be a fixed factory settings profile, and a userconfigurable default profile. PAGE 202 • • • DTR hangup: Whenever the logger wants to hang up a connection it will set the DTR (data terminal ready) signal to inactive. The modem should be set such that it will drop the connection whenever it sees DTR inactive. This behaviour can be set for most modems with the command AT&D2. Fixed local baud rate. Most modems will set their local baud rate automatically ("autobaud") to match that of the connected device, once it sees an AT command from the device. PAGE 203 Powering the DT80’s Modem If required, the DT80 can control power to the modem, so that it can be powered down under program control when not in use. PAGE 204  HANGUP Command The HANGUP command causes the DT80 to instruct its modem to hang up (disconnect) the current dial-out or dial-in connection. If there is currently no connection, HANGUP is ignored. This can be used in an alarm action command to cause the DT80 to hang up a call in progress when an alarm condition arises. PAGE 205 Part L – Network Communications TCP/IP Concepts About TCP/IP TCP/IP (Transmission Control Protocol / Internet Protocol) is a standardised set of rules, or protocols, that allow computers to talk to each other. TCP/IP is the glue that holds the Internet together. Most of the TCP/IP based protocols revolve around the concept of a server providing services to a client. Servers and clients are software modules loaded onto a computer or device. PAGE 206 TCP/IP Parameters In order to operate correctly on a TCP/IP network, the DT80 must know the following: • its own unique IP address • for Ethernet connections, the subnet mask applicable to the network to which it is connected • (optional) the gateway IP address applicable to the network to which it is connected • (optional) the DNS server address applicable to the network to which it is connected IP Address Every device that is connected to a TCP/IP network must have its own unique identifier, calle PAGE 207 Subnet Mask The DT80's Ethernet IP address actually consists of two parts: • The network number, which identifies the network to which the DT80 and its neighbours are connected. • The node number, which uniquely identifies this DT80. No two devices on the network may have the same node number. Also known as a host number. The subnet mask is a property of the network to which the DT80 is connected and specifies which part of the IP address is the network number and which is the node number. PAGE 208 Mobile Plans As with any mobile device, in order to use the integrated modem you will need a SIM card (subscriber identity module), supplied by a mobile carrier. The SIM needs to be associated with an "appropriate" mobile plan. There are currently hundreds of different mobile plans on offer by carriers around the world. It is important to select one that is compatible with the DT80 features that you intend to use. PAGE 209  Data Usage The amount of data transferred each month will depend on the number of channels sampled, and the frequency. Assuming that all data logged by the DT80 is transferred to a single FTP server, then the volume of data transferred will be approximately equivalent to the volume of data logged. As discussed in How Much Data Can I Store?(P95), each time a schedule executes it will store 10 bytes + 10 bytes per channel (that has logging enabled). PAGE 210 The DT80 only supports third-party email servers that: • support LOGIN authentication • do not require SSL (Secure Sockets Layer) encryption Note: gmail SMTP service aspmx.l.gmail.com may be used with some limitation on destination address since it may get filtered by destination server.  DT80 Servers Mobile data plans are typically set up to allow mobile client devices to access servers on the Internet. Doing the reverse, i.e. PAGE 211 To load the SIM card: 1. Locate the SIM card slot on the right hand side panel 2. Slide the plastic locking tab to the left, if required, to expose the full width of the slot 3. Position the SIM card so the edge with the diagonally cut corner is facing inward and the gold contacts are facing up. Slide the SIM into the slot until it clicks into place 4. Slide the locking tab to the right to lock the SIM in place. The SIM will not be recognised unless this is done. To remove the SIM card: 1. PAGE 212  PIN If your SIM has a PIN set then you will need to tell the DT80 what it is. Enter it into the SIM PIN field on the modem configuration page in dEX, or send the following profile command to the logger directly: PROFILE MODEM PIN=pin If this profile is not set correctly when you first attempt to use the modem, then the DT80 will prompt for entry of the PIN on the LCD display. Use the Up and Down arrow keys to set each digit's value, and use the Left and Right arrows to move between digits. PAGE 213 Figure 84: Email configuration page In the above screen shot, the logger has been set up to use the (fictitious) third party email provider yourdomain.com. The server name, as specified by the provider, is smtp.yourdomain.com. The account name (user) and password have also been entered. Email sent by this logger will appear to come from "Cold Room 3", with email address of user@yourdomain.com. PAGE 214 If you choose to use the no-ip.com service instead, then the required settings are: PROFILE MODEM_SESSION DDNS_SERVER_URI=dynupdate.no-ip.com/nic/update PROFILE MODEM_SESSION DDNS_SERVER_PORT=80 If you wish to use some other provider then you will need to optain the appropriate address update URI and port number from the provider. PAGE 215 Verifying Modem Operation If the settings described above are set correctly then it should now be possible for the DT80 to establish an Internet connection. There are a few different ways of testing this. Modem Status Screen The simplest method of verifying basic Internet connectivity is to use the modem status screen on the DT80's display. This does not require an Ethernet/USB connection so it is a convenient method if automatic configuration was used. The procedure is as follows: 1. PAGE 216 To send an SMS message, try: DO"test message"[sms:+61400123456] ... SMS: Sending to +61400123456 SMS: Sent OK which will send a message to the Australian mobile number 0400 123456. In this example, the mobile number has been specified in international format: a "+", then the country code (61 in this case), then the number with any leading zero dropped. To send an email, try: DO"test email"[mailto:cat@felines.org] ... EMAIL: Connecting to server EMAIL: Sending to cat@felines. PAGE 217 • perform a DDNS update, if enabled • send a test email (if an email address was specified) • send a test file to an FTP server (if server details were specified) • verify all configured ping servers (if ping was selected as the desired network check, or heartbeat, mechanism) • send a test SMS (if a phone number was specified) • end the communications session After each step, a tick or cross is displayed to indicate success or failure of the operation. PAGE 218 Category Display Coverage or network problem [Data dropped] -12 [SMS problem] -13 Normal session termination 81SV Description [No data service] -17 The mobile network does not support GPRS or any other data services. Possibly try a SIM from a different carrier. The measured signal level is below the minimum required for a usable data [Signal too low] -16 connection (-93dBm). Try relocating the antenna to improve reception. Or set MIN_SIGNAL_FOR_DATA_DBM profile to lower value. PAGE 219 Signal Levels In order to achieve reliable data communications using the integrated modem, it is important to ensure that the signal levels are adequate. The DT80's modem samples the signal level when connecting to the mobile network, and displays it on the modem status screen in the form of 0-4 "bars". Note that the displayed signal level is not updated whilst the modem is connected. PAGE 220 Note: Radio emissions from the antenna can interfere with and reduce the accuracy of analog measurements taken by the DT80. To prevent this, the antenna should be positioned at least 500mm away from the DT80 and any analog sensor wiring. Network Selection  Service Type The type of network is reported on the modem status screen, to the left of the signal level bar graph. PAGE 221  Selecting a Network The DT80 will connect to the first network that it finds that satisfies the configured service type and band restrictions described above (if any). If, however, the chosen network's signal level is considered inadequate (below the threshold set by the MIN_SIGNAL_FOR_DATA_DBM profile) then the DT80 will look for alternative networks that still satisfy the service/band restrictions but which may have better signal. Home networks are checked first, then roaming networks. PAGE 222 • DDNS update aborted. Modem interface is on private LAN – DDNS will only work if the DT80 has a public IP address. If it has a private IP address (10.x.x.x, 192.168.x.x or 172.16-31.x.x) then there is no point giving this to a DDNS server because no system outside the private network will be able to reach it. Communications Sessions DT80 integrated modem models are often deployed in remote locations, with limited power available. Power management is therefore very important in these applications. PAGE 223 Normally, SMS messages are sent at the start of a session, before a data (Internet) connection is established. Sending an SMS during an established session may cause the data connection to be disrupted, causing the session to end prematurely. PAGE 224  dEX Settings In the dEX Configuration Builder, the session timing settings can be found under Modem, on the Power tab, as shown in Figure 87. Figure 87: Session timing setting A daily time window can be defined by selecting Periodically and entering the start and stop time. The other "cron" fields (e.g. day of week) are not supported in dEX. Error handling Power supplies, communications links, networks and file servers are often imperfect. PAGE 225 If the DT80's modem is used to connect to a private wide area network (as opposed to the Internet) then a DNS server might not be available. If this is the case then "ping" may be used as an alternative network check mechanism. To enable this you need to set the NETWORK_CHECK profile, and configure a comma-separated list of one or more servers that you know will respond to a ping. For example: PROFILE MODEM_SESSION NETWORK_CHECK=PING PROFILE MODEM_SESSION PING_SERVERS=192.168.10. PAGE 226 If the session is still OK then the problem must be either a problem with the FTP server, or the unload command is incorrect (e.g. an invalid server name or credentials were specified). Either way, the DT80 will now retry the FTP transfer, using a similar strategy to that for session retries. That is, it will wait for the configured RETRY_DELAY_S time then retry, with this time being multiplied by 60 on every third attempt. By default, these retries will continue indefinitely. PAGE 227 If the session is still OK and the problem occurred while connecting to or logging in to the SMTP server then the DT80 concludes that this is a server problem, or the email related profile settings are incorrect. Either way, there is nothing wrong with the actual email message, so it will remain in the queue. The DT80 will then retry connecting to the SMTP server, using the same timing parameters as for session retries, i. PAGE 228  Listing Session Queues When an alarm or unload occurs, the resulting message or data file is placed in a queue. PAGE 229 While this mode is in effect, details of the currently registered network and signal strength will be updated every few seconds on the display, and a line will also be sent to the command interface, e.g. SESSION SIGNAL SESSION: Starting Network: 3G; Operator: Telstra; Signal: -81dBm; BER: Network: 3G; Operator: Telstra; Signal: -83dBm; BER: … 0.14%; Acceptable: Y 0. PAGE 230 Queues If an FTP/email data unload is performed, e.g. COPYD dest=ftp://womble.com/data/?interface=eth or an email alarm is triggered, e.g. IF(1TK>50)"Overtemp"[mailto:wilbur@womble.com?interface=eth] then an entry will be added to the appropriate communication queue. On a DT8xM model, the communications queues may contain items for the modem interface and items for the Ethernet interface (the interface= option is used to select which interface to use). PAGE 231 Email alarm messages will be retried four times then discarded. By default, FTP/email data unloads will be retried indefinitely; however this can be limited if required using PROFILE UNLOAD FTP_RETRIES=num which will delete the unload data file from the queue after num retries. PAGE 232 Figure 90: Typical Ethernet LAN In the above example, the DT80, PC1, a router, and possibly some other devices are all connected on the same private LAN "segment", or "subnet". All devices on this particular subnet have IP addresses beginning with 192.168.1. All devices on the same subnet can communicate with each other directly. PC2, on the other hand, is connected to a different subnet. It cannot directly communicate with the DT80; it needs to go via the router. PAGE 233 Ethernet Port Indicators The two LEDs on the DT80’s Ethernet port (P279) indicate the following: • Green LED – Link OK; should come on and stay on as soon as you connect the Ethernet cable • Amber LED – Activity; blinks every time a data packet is received If the green LED does not come on then either the DT80 Ethernet port is not enabled, or the cable is faulty, or the socket you are connecting to is not connected to an active Ethernet network, or the hub/bridge/router is not powered up. PAGE 234 Alternatively, if a DHCP server was available on the network then you could simply use: PROFILE ETHERNET IP_ADDRESS=AUTO By default, the above command is assigned to one of the DT80's user defined functions, accessible from the front panel; see User Defined Functions (P120). This makes it easy to enable Ethernet on a new logger without having to connect to it. Setting DNS Server address To set the DNS server address use PROFILE NETWORK DNS_SERVER_1=192.168.42.4 PROFILE NETWORK DNS_SERVER_2=192.168.42. PAGE 235 How to set up Ethernet Initial decisions In order to set up an Ethernet connection to the DT80, you need to decide: • whether the DT80 will connect directly to a PC (Figure 89), or connect to an existing LAN (Figure 90), or connect to a modem/gateway (Figure 91) • whether the DT80 will use a static (manually configured) or a dynamic (automatic) IP address. PAGE 236 5. Test the connection You should now be able to connect to the DT80. For example, you could enter the DT80's IP address (169.254.25.77 in the above example) into a web browser in order to access the DT80's web interface, or you could create a TCP/IP connection in DeTransfer or DeLogger, again specifying the DT80's IP address. Network Connection – Automatic IP address The procedure for connecting to an existing LAN using automatic configuration is very similar to the above "direct connection" scenario: 1. PAGE 237 Dhcp Enabled. . . Autoconfiguration IP Address. . . . Subnet Mask . . . Default Gateway . DHCP Server . . . DNS Servers . . . . . . . Enabled . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : : : : : : Yes Yes 192.168.11.44 255.255.255.0 192.168.11.250 192.168.10.100 192.168.10.100 192.168.10.111 In this case the subnet mask is 255.255.255.0, which indicates that the first three parts of the IP address (192.168. PAGE 238 7. Test the connection You should now be able to connect to the DT80. For example, you could enter the DT80's IP address (192.168.11.10 in this case) into a web browser in order to access the DT80's web interface, or you could create a TCP/IP connection in DeTransfer or DeLogger, again specifying the DT80's IP address. PAGE 239 Note4: Once the NAT router has been set up to forward the required ports, you should now be able to access the DT80 from outside the local network using the network's public IP address. So in this example, you could enter http://203.54.192.12 into a web browser and you should see the DT80 web interface. Note5: The public IP address (203.54.192.12) should only be used from computers outside the local network. PAGE 240 WiFi Communications WiFi Interface Series 4 loggers now have the ability to connect via WiFi, either directly or via your network Logger Models The new WiFi Logger models are listed below: • DT80W and DT85W are WiFi variant of DT80 and DT85 • DT80GW and DT85G are WiFi variant of geologger DT80G and DT85G Modes There are two ways to connect to a network, Client and Access Point. PAGE 241 WIFI INFO WLAN Interface: Mode: ACCESS_POINT State: JOINED SSID: DT80S4_AP RF Channel: 1 Security Mode: PSK WPA2 HW ADDR: 00:23:a7:5c:db:9c IP: 192.168.0.1 Subnet Mask: 255.255.255.0 DNS Server 1: 0.0.0.0 DNS Server 2: 0.0.0. PAGE 242 In this example the DT80 has IP address 192.168.0.1 configured for the WIFI interface. The WIFI Interface of the logger configured in Access Point mode, passed initialization and currently in Joined state. It uses RF Channel 1 and Security mode PSK WPA2 (Pre-Shared Key WPA2), having Ethernet Address 00:23:a7:5c:db:9c and subnet mask 255.255.255.0. No DNS servers configured, because of the mode and the interface statistics shows no traffic occurred through the interface yet. PAGE 243 Key Value Default AP_CHAN_NO Access point RF channel number (Access Point mode) For 2.4GHz band modules in current implementation channel range is limited to 1..11 inclusive. 1 BEACON_INTERVAL Interval in milliseconds defining how frequently the wireless beacon messages to be transmitted (Access Point mode). Value may vary in the range 100..1000 100 Maximum number of client stations can be connected to the interface (Access Point mode). Value may vary in the range 0.. PAGE 244 email sent by the logger is unable to be delivered, a "bounce" error message will normally be sent to this address. PAGE 245 Setup WiFi Client PSK Figure 97: WiFi page – Client PSK selected and List of available network Enable WiFi operation by checking the checkbox and to connect via Client PSK mode simply select that mode then you can either scan for a list of available WiFi networks or you can enter your setting directly if known. To manually add a WiFi connection edit the SSID connection info and press the Join Network button to commit the new settings and start the WiFi connection process. PAGE 246 PPP Communications About PPP Point-to-Point Protocol (PPP) allows TCP/IP-based protocols to be run over the USB, Host RS-232 and/or serial sensor port of the DT80. The DT80 operates as a PPP server. A client computer can connect to the DT80, via modem or direct cable, in much the same was connecting to a dial-up Internet Service Provider. (Modem connections are only supported on the host RS232 port. PAGE 247 PROFILE HOST_PORT [HOST_PORT] BPS = 57600 DATA_BITS = 8 STOP_BITS = 1 PARITY = NONE FLOW = HARDWARE FUNCTION = COMMAND In order for the port to support PPP, the FUNCTION parameter must be set to COMMAND or PPP: • • The COMMAND setting (which is the default for USB and host RS232 ports) means that the port supports both the regular command interface and PPP, automatically switching between the two when a PPP connection is established and disconnected. PAGE 248 Figure 100: List of installed modem devices (Windows XP) This dialog shows all currently installed modem devices. In the above example the computer's internal dial-up modem is shown (COM3), along with two null modem cables (which, as far as the computer is concerned, are still "modems"). In this case it so happens that the COM4 null modem cable is an RS232 cable, while COM5 is a USB cable – although this is not apparent in this dialog. 5. PAGE 249 9. Complete the wizard by specifying whether or not you would like it to create a desktop icon for the connection. (A desktop icon allows you to establish the PPP connection simply by double clicking on the icon.) 10. The wizard will now display the Connect dialog. (Figure 101; you will see this dialog each time you establish a PPP connection to the logger.) Press Cancel for now. A few more options should be set before connecting, as detailed below. PAGE 250 Figure 102: PPP Modem Configuration for direct cable connection (Windows XP) For a direct RS232 cable connection, ensure that the Maximum speed setting is set to the configured baud rate the DT80 serial port in use. For a USB connection this setting is irrelevant. Check that the other settings are as shown in Figure 102 , then press OK. 4. On Windows XP, select the Networking tab, then press Settings. On Windows Vista/Windows 7, select the Options tab then press PPP Settings. PAGE 251 Figure 104: TCP/IP Settings – uncheck the Use Default Gateway option Check the settings against those shown in Figure 95. In particular, the Use default gateway option should be disabled. If this is not done then Windows will attempt to use the PPP connection as its default Internet connection, the end result being that the Internet will not be accessible from your computer while a PPP connection to the DT80 is in progress. PAGE 252 3. Select Setup a dial-up connection. 4. If more there is more than one modem installed then you will be asked to select which one you want to use. Select the correct one from the list. 5. You will now be prompted for your ISP connection details (telephone number, username and password). Enter the phone number for dialing in to the DT80 modem. Enter the username and password specified in the DT80 profile (by default DATATAKER and DATATAKER, note these are case sensitive). PAGE 253 6. Press OK to close the various "properties" dialogs, and return to the Connect dialog (Figure 92). You can now try establishing a PPP connection, see Using PPP (P253). Using PPP Once a PPP connection has been set up, the general day to day process for using it is as follows: 1. Ensure that the physical communications link is plugged in (modem or null modem cable). 2. Establish a PPP connection by "dialing up" to the DT80 (for a direct cable connection no actual "dialling" occurs). 3. PAGE 254 A PPP session will also be automatically terminated if the USB cable is disconnected, or the modem connection drops out. Troubleshooting This section discusses a few possible reasons why a PPP connection may fail to connect. The error messages listed here are the common ones returned by Windows XP. Windows Vista is somewhat less helpful in that it simply indicates that "the connection failed", which could be due to any of the reasons below. PAGE 255 Figure 107: Example software connection for a DT80 on an Ethernet network (DeTransfer software shown) Note: When creating a new connection the current version of DeTransfer defaults to Port 8. It must therefore be explicitly set to Port 7700. If you now press Connect, you should be able to send commands to the DT80 and receive data, just as you would using USB or RS232. PAGE 256 Passwords The FTP server supports two types of access: • an anonymous login (username ANONYMOUS, password can be anything) provides read-only access to the DT80's file system. PAGE 257 Troubleshooting If you experience problems connecting to the DT80 FTP server, it can be helpful to examine the raw FTP messages that are being exchanged. To enable display of received and transmitted FTP messages, set P56=8. For example: P56=8 >> 220 dataTaker FTP Server ready. Type HELP for help << USER anonymous >> 331 User name okay, need password. << PASS IEUser@ >> 230 User logged in, proceed. << syst >> 215 UNIX Type: L8 << PWD >> 257 "/" is current directory. PAGE 258 • Disable anonymous FTP login: • Change the FTP username and password • Set up the DT80 on a private LAN behind a NAT router. You will need to configure the router to forward traffic to the required servers' ports to the DT80 (see DT80 on Private Network (P238)). • Disable any pages that are not required in the dEX web interface, using the Web Interface Configuration Tool (see Customising the Web Interface (P160)). PAGE 259 Security Commands Administrator can create and update the user database. The table below specifies the commands for different user operations (use within command interface). Security Commands USER USER username Functions list all user accounts list a user account specified as a parameter USER username PASS=password create or change password for the specified User account (by default account will be created having No Access). USER username PASS=password GRANT=ADM ACTION=ACT EMAIL=user@domain. PAGE 260 Part M – Configuration Configuring the DT80 Parameters DT80 parameters are internal system settings. They are global in their effect, and allow a variety of options to be set. As a general rule, set the parameters that require changing before programming schedules and alarms. Parameters are numbered from P0 to P62, although not all numbers are used. Each parameter is an integer; the range of allowable values varies from parameter to parameter. PAGE 261 Parameter Specifies Default Range of Comment Value Values Sets analog measurement duration to 1/ P11 seconds . 50 1 to Set P11 to the local mains frequency for best noise 10000 rejection. PAGE 262 Default Range of Comment Value Values Units for all temperature measurements: 0 = ºC Celsius 0 0 to 3 1 = ºF Fahrenheit 2 = K Kelvin 3 = ºR Rankine Parameter Specifies Units P36 Temperature units mode P38 Decimal point character ASCII 46 (. PAGE 263 Reading Switches To read the current settings of all switches, use the STATUS9 command (P276), e.g.: STATUS9 /C/d/E/f/h/i/K/l/M/N/R/S/t/U/w/x/Z Switches that are ON are displayed in uppercase. Setting Switches Switches can be set at any time, and new settings generally take effect immediately. For example, send: /T /e/m to set switch T on, and set switches E and M off. Note: Switches are not channels. PAGE 264 Profile Settings The DT80 profile is a group of named settings which control aspects of the logger's operation. Unlike parameters and switches, profile settings are "permanent", in that they are not cleared by a soft or hard reset (INIT and HRESET commands respectively, see Resetting the DT80 (P273)) Structure The DT80's profile settings are divided into a number of sections, each of which deals with a particular area, e.g. host port, modem, Modbus server, etc. Each section is identified by name, e.g. PAGE 265 Section Name Key Name BPS SERSEN_PORT (not present on DT82E models) DATA_BITS STOP_BITS PARITY FLOW MODE FUNCTION USB_PORT FUNCTION (not present on DT82E/82I models) EXT_POWER_SWITCH HOST_MODEM (not present on DT8xM models) MODEM (DT8xM models only) MODEM_SESSION (DT8xM models only) UM-0085-B09 RG Legal Values 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 7, 8 1, 2 NONE, EVEN, ODD HARDWARE, SOFTWARE, NONE RS232, RS422, RS485 COMMAND, PPP, SERIAL, MODBUS, MODBUS_MASTER, DISABLE Factory Defau PAGE 266 Section Name Key Name Legal Values Factory Default Comment STOP_CRON cron-spec 0:0:13::: If TIMING_CONTROL=CRON then this specifies session end time NETWORK_CHECK DNS, PING, OFF DNS Method to use for checking network connectivity. PING_SERVERS string SMTP_SERVER string () Name of SMTP (email) server string SMTP_PASSWORD () SMTP account name, if required string () SMTP password, if required RETURN_ADDRESS string your.logger@ datataker. PAGE 267 Section Name Legal Values Factory Default Comment COMMAND_SERVER SESSION_TIMEOUT 0-65535 0 If 0 the session never disconnects. Any value can be set in seconds and command server session will end after inactivity for the specific period. HTTP_SERVER PORT 0-65535 80 TCP port number used by web server (0=disable) HTTP_SERVER ENABLE_WDG YES,NO YES If YES, HTTP and socket monitor is enabled. PAGE 268 Section Name Key Name Legal Values Factory Default Comment COEX_MODE WLAN WLAN SECURITY_MODE OPEN, PSK_WEP, PSK_WPA, PSK_WPA2 Selects WIFI module operation mode defining protocol stacks loaded. Currently, only WLAN mode is supported. PSK_WPA2 Defines security mode being used by logger’s WIFI interface. PSK SSID DATATAKER Pre-Shared Key Secret string DT80S4-AP WIFI Service Set Identifier (SSID). HIDDEN_SSID YES,NO NO Enables hiding SSID during network scan for Access Point Mode. PAGE 269 Command Server Timeout Profile A command server timeout has been added while fixing the communication issues over TCPIP on poor network connection. The default value on the Command _Server SESSION_TIMEOUT is zero, which will never disconnect the connection. Any value can be set in seconds and command server session will end after inactivity for the specific period. PAGE 270 Note: If the DT80 system time is synchronised to an NTP server (see below), and the DT80 time is set to local or local standard time, then the TIME_ZONE profile setting must be set correctly. If NTP is not used then this profile setting is not used. Setting the Time in dEX The dEX configuration builder can be used to set the DT80 time manually, or synchronise it to the PC's time. Select the Logger menu, then Set logger date & time. This will display a dialog box showing the PC time and the logger time. PAGE 271 The NTP server address (host address) may be specified as a numeric IP address (e.g. 10.2.30.212) or as a host name (e.g. ntp3.petacorp.com). Using a host name requires that the DT80 have access to a working DNS (domain name system) server. NTP Options The above three profile settings are the minimum that need to be set in order to enable NTP updates. There are, however, a number of settings that may be adjusted to suit particular applications. PAGE 272 Manually Triggered NTP Requests When background NTP requests are enabled in the profile, a request will be performed: • at the configured time intervals • following hard reset • following wake from sleep • following any change to any of the NTP profile settings An NTP request can also be triggered manually, regardless of whether or not background NTP updates are enabled. This is done using the NTP command. PAGE 273 Resetting the DT80 The DT80 can be reset in the following ways: • soft reset – clears current job and resets parameters and switches • hard reset – restarts DT80 firmware • safe mode reset (a.k.a. triple push reset) – restarts DT80 firmware and runs using factory default settings. Soft Reset The INIT command performs a soft reset, which has the following effects: • • The message Initializing... is returned The current job is cleared, i.e. PAGE 274 Safe Mode If there is an error in the DT80's profile settings or the job that is automatically loaded following hard reset then you may find that you are unable to communicate with the logger. For example – the startup profile specifies the wrong RS232 parameters (and you're not sure what they are), or the job specifies an immediate 1SERIAL channel with a very long timeout (and the serial channel is not connected to anything). Safe Mode provides a mechanism to regain control and fix the problem. PAGE 275 Diagnostic Commands TEST Command The TEST command causes the DT80 to perform a self-calibration, then run a series of self tests. Test results that are out of range are flagged with a FAIL message. This command can also be issued via the DT80 web interface . A typical test report is shown below. TEST 0 TEST report generated at 2008/02/13,16:05:09 dataTaker 80 Version 7.02.0002 Flash 2007/12/21 17:09:56 29 1 Product: Serial Number: 2 3 4 5 6 7 8 9 VEXT VBAT (6V) IBAT VSYS VLITH (3.6V) VDD (3. PAGE 276 Note: if the main or Lithium battery are absent then there will be FAIL lines in the output from the normal TEST command but this will not affect the overall pass/fail result.  Power on Self Test The TEST command is also run automatically, following a hard reset. If this test fails then Self test failed is displayed on the LCD in conjunction with two flashing LEDs, and a message is output to comms port and event log. Press any key to clear the LCD message. PAGE 277 As with the TEST command, lines in the status report can be returned individually, using STATUSn. PAGE 278 Part N – Hardware & Power Inputs and Outputs Wiring Panel The front face of the DT80 is the sensor interface. Removable screw terminal blocks make it easy to connect and disconnect sensor wiring. The terminals are labelled as shown below. Note that the label is removable, so it can be replaced with application specific labelling if required. PAGE 279 DT85/ DT85L/ DT85LM3 DT85G/ DT85GL/ DT85GLM3 Figure 111: Standard terminal labels for DT80, DT82 and DT85 Series 4 The sensor interface comprises: • 1D – 8D: Digital Input/Output Channels (P331) • WK: Wake Terminal (P300) • 12V: 12V power output (not DT80/ 81 Series 1) (P290) • 12V/ 5V: 12V or 5V controllable power output (Series 4 only) (P290) • DGND: Digital Ground (P369) • 1C – 4C: High Speed Counter Inputs (P338), shared with Phase Encoder Inputs (1PE-2PE) (P340) • 5C – 7C: High Speed Cou PAGE 280 • Hardware Reset Hole (P273) • External 10-30VDC Input Terminals (P286) • Battery Charger Terminals (not present on DT82E/ 82EM/ 80L/ 80LM/ 85L/ 85LM/ 85GL/ 85GLM) (P286) • 10-30VDC Plug Pack Connector (P286) A threaded hole is also provided as an earthing point. This is internally connected to DGND. On some models, this point also acts as a protective ground (indicated by the Earth symbol enclosed within a circle). See Grounding (P286) for more information. PAGE 281 DT80 models with integrated WiFi interface have WiFi related interfaces on the right side panel. Only one antenna connector for WiFi is available in this side. A threaded hole is also provided as a functional earth point. This is internally connected to DGND. Front Panel The top face of the DT80 is the user interface – keypad, display, indicators and USB memory device slot. See DT80 Front Panel (P118). PAGE 282 Inside the DT80 Accessing the main battery (if fitted) 1. Remove the power connector 2. Remove the screws from the other end of the logger 3. Remove this end of the logger 4. Pull the purple 'battery tail' 5. Disconnect the battery terminals Figure 115: How to remove the main battery Warning1: When reconnecting the main battery, observe the correct polarity. The red plug connects to the positive (+) battery terminal. PAGE 283 Accessing the lithium memory backup battery 1. Remove the power connector (if fitted) 2. Remove all the terminal blocks 3. Terminal blocks removed 4. Remove the screws from the right hand end of the logger 5. Remove this end of the logger 6. PAGE 284 7. Disconnect the battery terminals (models with internal battery only) 8. Remove screws on bottom of logger. DT80/81/82 models have two screws, DT85 models have three. 9. Remove the battery cage (models with internal battery only) 10. Carefully slide the circuit board bundle partially out of the case. Be careful of the flexible cable running between the top circuit board and the keypad. Do not completely remove the circuit boards from the case. PAGE 285 Installation Dimensions Figure 117: Mounting hole positions and overall dimensions • DT80/82 overall dimensions (L x W x H): 180mm x 137mm x 65mm • DT85 overall dimensions: 300mm x 137mm x 65mm • CEM20 overall dimensions: 180mm x 100mm x 50mm. Note that CEM20 mounting hole centres are the same as for the DT80/82. • Mounting screw size: M5 • Some clearance for communications/power cabling will be required on the left hand side of the unit, and at the front for sensor wiring. PAGE 286 Grounding Note: Protective earth must be installed for all of the installations where sensors and cabling is outdoors and is potentially subjected to lighting strike. Warning: Correct grounding provides a safe discharge path for large electrical currents which may occur due to lightning or electrical faults. When installing the DT80, consideration must be given to proper grounding, particularly where sensor or antenna cabling is outdoors, and therefore potentially subject to lightning strike. PAGE 287 Figure 120: DT80/ 82I/ 85 series 4 internal power subsystem Figure 121: DT82E/ 80L/ 85L series 2 and 3 internal power subsystem Figure 122: DT82E/ 80L/ 85L series 4 internal power subsystem External Power The DT80 is normally powered by an external 10-30V DC supply. This might, for example, be: • a mains supply (e.g. PAGE 288 Internal Power not applicable to DT82E/ 80L/ 85L/ 85GL If the external power supply is interrupted, the DT80 can run for a limited time on battery power. Main battery The DT80 and DT81/82I are fitted with an internal 6V 1.2Ah sealed lead-acid gel-cell battery, while the DT85 uses a higher capacity 6V 4Ah battery. It’s known as the DT80’s "main" battery to distinguish it from the DT80’s other internal battery, the "memory-backup" battery. PAGE 289 Figure 123: Connecting an external 6V battery – battery link removed Figure 124: Connecting an external 6V battery – internal battery disconnected or removed Note: larger capacity batteries will take longer to charge. this configuration is not useful for a DT85 because it already includes a 4Ah internal battery. The DT80's charging circuit includes temperature compensation. For this to be effective, the external battery and the DT80 must be at a similar ambient temperature. 2. PAGE 290 Other Considerations The main battery is a "sealed" type; however it does contain a regulator valve on its top face near the terminals. This has the following implications: • Ventilation must be provided to allow any battery gases to escape. If the DT80 is mounted in a sealed enclosure then a valve should be provided to prevent gas build-up. • When operating at high temperatures, acid may seep from the regulator valve if it is facing downward. PAGE 291 Parameter P28 is used to control the behaviour of the 12V or 12V/ 5V output. P28 Description Scenarios Auto CEM20 power control: DT80 ensures that 12V is switched on prior to execution of a schedule that contains CEM20 channels. PAGE 292 Monitoring DT80 Power The DT80 provides a number of internal channel types for monitoring the various power systems. These can be queried at any time or used in alarms, like any other channel type. The following channel types are available: Channel Type VEXT VBAT IBAT VLITH Units Description V External power supply voltage V Main battery terminal voltage (5. PAGE 293 • 12V power output (Series 3 and older) • 12V/5V regulated power output (Series 4 only) • 5V SW regulated power output (Series 3 only) • V/I DAC regulated voltage and current output (Series 4 only) • WiFi operation The actual power consumption of each of these will be discussed further below. PAGE 294 The following tables show the equivalent data for the "low power" DT80 models Scan rate 0 analog channels 5 analog channels 30 analog channels 300 analog channels continuous 1300 mW 2020 mW 2000 mW 2000 mW 1 sec 370 mW 720 mW 2000 mW 2000 mW 5 sec 200 mW 280 mW 630 mW 2000 mW 10 sec 100 mW 150 mW 320 mW 2000 mW 1 min 25 mW 35 mW 65 mW 380 mW 10 min 12 mW 12 mW 15 mW 50 mW 1 hour 10 mW 10 mW 11 mW 17 mW 10 hour and above 10 mW 10 mW 10 mW 10 mW Table 14: DT82E/ 80 PAGE 295  Step 2 – Other Hardware The following table specifies the typical additional power required by each of the DT80's "non-core" hardware modules: Module Powered during sleep Battery power (6V) DT80/ 81/ 82I/ 85/ 85G External power (12/24V) DT82E/ 80L/ 80GL/ 85L/ 85GL External power (12/24V) Ethernet No 300 mW 500 mW 400 mW LCD Backlight No 450 mW 600 mW 350 mW Analog Subsystem (see note below) No 650 mW 1000 mW 650 mW No (Yes if P28=2) 400 mW 550 mW 350 mW No (Yes if P28=2) 350 mW 3 PAGE 296  Example 1 A DT85 is powered by an external 12V supply, is running a 10 second schedule with 5 analog channels, and the 12V power output is enabled with a 200mW load connected. The Ethernet port is disabled. Using Table 12, the average power consumption for the core hardware is 420mW. We now need to add the power used by the 12V power output (550+200 = 750mW, from Table 16). PAGE 297 So assuming that each day the modem spends 640 seconds idle and 20s actively sending then the additional daily power use for the modem is, from Table 16, 640 x 1600 + 20 x 2500 = 1074000 mW.s, so the increase in overall average power would be 1074000 / (24x60x60) = 13 mW The total average power use would therefore be about 136 mW. However some additional margin would need to be added to allow for communications retries and time spent online using dEX. PAGE 298 At 0°C, the overall battery capacity will be reduced by about 20% (compared to 20°C), so the battery life for high and mid discharge rates will be shortened. However, the self-discharge rate will also be reduced, so for very low discharge rates the battery life will be comparable to that for 20°C.  Example 1 A DT85 is set up to measure 10 analog channels every 5 seconds. How long can it run using the internal 4.0Ah battery? The first step is to calculate the average power consumption. PAGE 299  Serial Ports The serial ports also use a small amount of power while idle, so if they are not required then they can be disabled, too: PROFILE SERSEN_PORT FUNCTION=DISABLE PROFILE HOST_PORT FUNCTION=DISABLE PROFILE USB_PORT FUNCTION=DISABLE  LCD Backlight Parameter P20 controls the operation of the LCD backlight. By default (P20=2), it will switch on when there is user activity (e.g. key pressed, or USB cable inserted), then switch off a short time (P17 seconds) later. PAGE 300 Sleep Mode The DT80 has a low power sleep mode that significantly reduces the power consumption – to as low as 2 mW when running from the internal battery. While asleep no measurements or processing can be done, but the state of the current job is preserved. The DT80 will automatically wake from sleep when a measurement is due, or some other event occurs. About Sleep Mode While the DT80 is asleep: • The LCD and all front panel LEDs are switched off. PAGE 301 Note: any Ethernet and USB connections are terminated whenever the DT80 goes to sleep – which is why the DT80 will by default disallow sleep while either of these ports are connected. Some of the above conditions can be overridden using the P15 parameter, as follows. PAGE 302 Part O – Sensors & Channels Overview This section describes how to use the DT80's analog, digital and serial inputs to measure many different physical quantities. The focus here is on the measurement process – connecting up a sensor and successfully reading it. The following topics are covered for each sensor type: • an overview of how a measurement is made • wiring configurations – how to physically connect to the DT80's input terminals. PAGE 303 The terminal specifier can be either: • • • • • nothing : measure between + and – terminals, : measure between * and # terminals, + : measure between + and # terminals, - : measure between – and # terminals, or # : measure between # and AGND/EXT# terminals For example, the command 3+V causes the DT80 to measure the voltage between the + and # terminals on analog input 3, while 1R means measure the voltage between + and – on analog input 1 (which will then be used to calculate the unknown resistance, PAGE 304 The auto-ranging process may therefore cause the time taken to sample a channel to be increased on occasion. To avoid this, the gain can be locked on a particular setting, using the GLx channel options. Note: auto-ranging does not affect the attenuator setting. Each channel definition command specifies (either implicitly or explicitly) whether the attenuators should be on or off. PAGE 305 Analog Input Isolation The DT80 uses relay multiplexers to switch input channels through to the instrumentation amplifier one at a time. All four terminals of each analog input channel remain disconnected from the DT80's electronics, except when that channel is being measured. This means that each analog input channel is totally isolated from any other input channel. PAGE 306 Current Current (rate of electrical charge movement) is measured by inserting a known shunt resistance into the circuit, and measuring the voltage across it. Using Ohm's Law, Current = Voltage / Resistance. The I channel type returns the current value in milliamps (mA). The DT80 incorporates an internal 100Ω shunt resistor between the # terminal and analog ground. Alternatively, an external shunt may be used. The value of the external shunt must be known and must be specified when the channel is defined. PAGE 307 C2 – Independent Current Inputs using External Shunts In this configuration up to two separate current sources can be measured. This is done by measuring the voltages across the shunts in the independent terminal configuration; see V2 – Independent Voltage Inputs(P305). The resistance of each shunt should be specified as the channel factor. PAGE 308 4–20mA Current Loops Many different sensor types provide a 4-20mA current output, where the current is proportional to the quantity being measured. The channel type for a 4-20mA current loop measurement is L; channel options are as for Current measurements; see Current (P306). To read a current loop sensor, the DT80 first measures the current. Any of the Current wiring configurations may be used. The measured current is then scaled so that the channel returns 0% for 4mA and 100% for 20mA. PAGE 309 Channel Options The following channel options are commonly used when measuring resistances: • 3W (3 wire; default), 4W (4 wire) or 2W (2 wire; Series 3 only) specifies the type of resistance measurement (number of wires) • I (200μA excitation; default), II (2.5mA excitation) and III (2uA excitation) specifies the amount of current to be passed through the resistance. • the channel factor specifies an offset adjustment (ohms) which is subtracted from the measured value. PAGE 310 R4 – 2-Wire Independent Resistance Inputs Note: This configuration is not available on DT80/81 Series 1 loggers. No lead resistance compensation is possible with this configuration (other than by using the channel factor) In Series 4, this configuration is not suitable with excitation III A 2-wire measurement can also be made by connecting the resistance to * and # only. This frees up the + and – terminals for a separate independent measurement. PAGE 311 R6 – High Resistance Input with Parallel Resistor Note: This configuration fits to Series 3 or older as the resistance measurements are limited to a maximum of about 10kΩ. Measuring resistance above 1MΩ in Series4 has not been tested Resistance measurements are limited to a maximum of about 10kΩ. This can be extended by wiring a known resistor in parallel with the resistance being measured. This will, however, reduce the resolution of low resistance measurements. PAGE 312 Channel Types The DT80 supports two bridge channel types, which differ by the way in which the excitation voltage Vex is determined. For a BGV channel, Vex is measured at the bridge; for BGI, the bridge is excited using a known current and then Vex is calculated from the known current and arm resistance values. The BGI channel type supports two different wiring variants: a true bridge configuration and a 3-wire "simulated bridge" which has many of the properties of a bridge. PAGE 313 • a precision 5.00V supply. In this case the DT80 does not measure Vex – it assumes that it is exactly 5.00V. The power supply should be located close to the bridge to avoid voltage drop due to cable resistance. . Figure 140: Wiring for 6-wire bridge using external voltage excitation To measure Use the command bridge output (3V supply) bridge output (6V supply) bridge output (5. PAGE 314 B3 – Multiple BGV Half Bridge Inputs Note: The excitation voltage need only be measured once; it will then be used for all subsequent BGV channels in the same schedule. In this configuration, three (or more) separate half bridges are wired in parallel so they share the same power supply and completion resistors (Rc). This allows three separate bridge measurements to be made per input channel (plus one channel to measure the excitation. PAGE 315 This configuration simulates a bridge by using the DT80's 3-wire compensation circuit to "compensate" for the voltage drop across Rc. The end result is that, like a bridge, the DT80 measures the difference between the voltages across the two arms. PAGE 316 Channel Types The DT80 supports all commonly-recognized thermocouple types: Type B C D E G J K N R S T Positive Negative Range Pt, 30%Rh Pt, 6%Rh +50 – +1820 °C W, 5%Re W, 26% Re 0 – +2320 °C W, 3%Re W, 25%Re 0 – +2320 °C Ni, 10%Cr Cu, 45%Ni -270 – +1000 °C W W, 26% Re 0 – +2320 °C Fe Cu, 45% Ni -210 – +1200 °C Ni, 10%Cr Ni,2%Mn, 2%Al -270 – +1372 °C Ni, 14%Cr, 1%Si Ni, 4%Si, 0. PAGE 317 A voltage channel is then used to measure the offset voltage and the TZ channel option is specified. This will cause all subsequent thermocouple channels in the same schedule to use this value as their zero, rather then the DT80's internal zero. For example: RA10S 5AD590(TR) 6V(TZ) 1..4TT Note: If a TR/TZ channel is used, it must precede the thermocouple channel(s) to which it applies, and be in the same sampling schedule. If a statistical option (e.g. PAGE 318 Channel Type R (Ω) at 25°C YS05 3kΩ YS07 5kΩ YS17 6kΩ YS16 10kΩ YS06 10kΩ YSI Thermistor Max. Temp °C 45005, 46005, 46030, 46040 200 44903 90 44904 70 44007, 44107 150 44034 75 45007, 46007, 46034, 46044 250 44905 90 44906 70 44017, 44117 150 45017 250 46017, 46037, 46047 200 44016, 44116 150 44036 75 46036 200 44006, 44106 150 44031 75 45006 250 46006, 46031, 46041 200 44907 90 44908 70 Min. PAGE 319 Temperature – RTDs Resistance Temperature Detectors are sensors generally made from a pure (or lightly doped) metal whose electrical resistance increases with temperature. Provided that the element is not mechanically stressed and is not contaminated by impurities, the devices are stable, reliable and accurate. Channel Types The DT80 supports four RTD types: Channel Type PT385 PT392 NI CU Metal Default 0 °C ohms Alpha Standard Platinum 100 0.003850 DIN43760 (European) Platinum 100 0. PAGE 320 Calibration The channel factor (shunt resistor value) can also be used as a calibration factor. For example, if the sensor reads 290.7K when the actual temperature is 289.5K (an error of +1.2K) then the required scaling factor would be 1 – (1.2 / 289.5) = 0.9959, which would then be multiplied by the nominal shunt resistance (100). So the correction would be applied as: 1AD590(99.59) Note: if the DT80's internal shunt is used (e.g. PAGE 321 Temperature – LM35 Series IC Sensors LM35 series sensors are 3-terminal semiconductor devices which produce a voltage output that is proportional to temperature. Supply voltage is typically 4-30V. Channel Types The following channel types are supported: Channel Types LM34 LM35 LM45 LM50 LM60 TMP35 TMP36 TMP37 Description Range 10mV/°F -50 – +300 °F 10mV/°C -55 – +150 °C 10mV/°C -20 – +100 °C 10mV/°C + 500mV -40 – +125 °C 6. PAGE 322 IC3 – LM35-Series Inputs – full temperature range This wiring configuration biases the negative terminal of the device to allow negative temperatures to be read. Refer to the manufacturer's data sheet for more details. PAGE 323 Calibration For LM135 series sensors, the channel factor specifies a voltage divider ratio, which can be used to correct a slope error based on a single point calibration. For example, suppose an LM135 is connected using a 2:1 voltage divider as shown in the wiring diagram. If the channel then reads 301.0K when the actual temperature is 302.4K (an error of -1.4K) then the required scaling factor would be 2 – (–1.4 / 302.4) = 2.0046, which would be applied as: 2LM135(2. PAGE 324 Channel Options Useful channel options for F channels are: • • the channel factor – this is the sample period (gate time) in ms (default is 30ms) 2V – this option will offset input signal by -2.5V. This effectively changes the threshold point from 0V to approx. +2.5V, which is useful for TTL level inputs • GLx, ESn, as for voltage measurements Note: For DT80/81 Series 1 loggers, the 2V channel option is not supported for differential measurements (measurements between the + and – terminals, e.g. PAGE 325 Strain is a dimensionless quantity, as it is a ratio of length to length. Strain is often expressed in ppm form (i.e. the length ratio is multiplied by 1,000,000), in which case it has the units of µStrain (microstrain). To convert the DT80’s ppm bridge readings to strain, use the formula: where • 𝑆𝑡𝑟𝑎𝑖𝑛 = 4 . 𝐵 µ𝑆𝑡𝑟𝑎𝑖𝑛 𝐺. PAGE 326 Measurement Timing When an FW channel is evaluated, the measurement process is as follows: 1. The pluck circuit begins charging. The MD timer starts here also. 2. After about 100ms, the pluck circuit releases its energy in the form of a narrow high voltage pulse. Inside the sensor this causes the wire to start vibrating. The resonant frequency will typically be in the range 500-5000Hz. 3. Once the pluck is complete (about 0. PAGE 327 Converting Frequency to Strain As mentioned above, the strain experienced by a VWSG is proportional to the change in the square of the resonant frequency. That is: 𝑆𝑡𝑟𝑎𝑖𝑛 = 𝐺(𝑓 2 − 𝑓0 2 ) where: • G is the gauge factor (supplied by the manufacturer) • f is the measured frequency • f0 is the zero or "at rest" frequency It is therefore necessary to take a zero reading, after installation of the gauge. This value should be recorded; it can then be used in a DT80 program in order to return strain, e.g. PAGE 328 CS1 – 5 Wire Carlson Meter The 5-wire configuration allows the DT80 to perform a 4-wire measurement on each resistance. It can therefore fully compensate for cable resistance, including unequal cable resistances. It does, however, require two analog input channels per sensor. Sometimes a sixth wire is included – an additional sense wire connected to the junction between the resistors. This can either be ignored or it can be connected to the + input of channel 2 in place of the link shown. PAGE 329 Figure 153: Wiring for 3-wire Carlson Sensor To measure Use the command 1R(4W,II,Rc) 1-R(II,Rc) R1 R2 Calculating Temperature and Strain  Temperature The temperature is given by: where: 𝑇 = �(𝑅1 − 𝑅2 ) − 𝑏�𝑎 • T is the temperature (°C) • R1 and R2 are the measured resistance values (Ω) • b is the temperature offset: total resistance at 0°C (Ω) (supplied by manufacturer) • a is the temperature factor: change in temperature per unit change in total resistance (°C/ Ω) (supplied by manufacturer). PAGE 330  Example The following example shows how the DT80 might be used to calculate a strain value. It will most likely need to be adapted to suit the type of sensor and the application. In this case a 5-wire sensor is used, with the manufacturer supplied parameters as shown. BEGIN 'Manufacturer data 'b = 68.22 ohm 'a = 4.86 degC/ohm 'G = 5.8962 ue/0.01% 'Z = 1.0137 'C = 10. PAGE 331 Digital Channels The DT80 provides: • 4 bidirectional digital I/O channels (1D-4D) with open drain output driver and pull-up resistor (3 channels 1D-3D for DT81/82E); • 4 bidirectional digital I/O channels (5D-8D) with tri-stateable output driver and weak pull-down resistor (SDI-12 compatible) (1 channel 4D for DT81/82E, none for DT82I); • 1 voltage free latching relay contact output (RELAY) • 1 LED output (Attn) • 4 hardware counter inputs (1C-4C) which can be used as independent counter channels PAGE 332 Digital Inputs The DT80’s 8 digital I/O terminals (4 for DT81/82E) can be read individually, or can be read as 4 or 8 bit words. PAGE 333 DI2 – Logic Inputs Actively driven logic signals can be directly connected to all input channels, provided that the input levels are within the specified limits; see Input Characteristics (P381). Figure 156: Wiring for reading TTL level signals on digital inputs To measure Use the command 1DS (0 = low, 1 = high) state Other Considerations  Scan Rate The digital input channels are scanned at 17ms intervals (60Hz), while the DT80 is awake. PAGE 334 • • • channel factor: for the single-bit types (DSO, RELAY, WARN) the channel factor is a delay value (ms). The DT80 waits for the specified number of milliseconds after setting the output state. Default is 0, i.e. no delay. If the R option is specified then the default and minimum delay setting is 10ms. R (reset) After setting the output bit(s) to the specified state(s) and waiting for the delay time, the output(s) will then be set to the opposite state. In other words a pulse will be generated. PAGE 335 DO1 – Driving a Relay Loads of up to 100mA @ 30V dc can be directly driven by the open-drain digital outputs 1D-4D (1D-3D for DT81/82E). Note that inductive loads such as relays should include a reverse diode to limit transients, as shown below. The power supply for the load can be an external supply, or you can use the power outputs provided on the DT85/DT80 Series 2-3 (12V or PWR OUT). On series 4 models along with 12V also the 5V power output is abailable with current load up to 300mA. PAGE 336 DO4 – Driving a Relay Using 5D-8D The active-drive digital outputs 5D-8D (4D for DT81/ 82E) cannot directly drive loads such as relays. However, an external transistor can be used to increase the current sink capacity so that a relay (or LED) can be controlled by these outputs. PAGE 337 For example, 6DSO(R,100)=1 6DS(W) DELAY=500 6DS will output a 100ms positive going pulse on 6D, then tri-state the output, wait 500ms then read the state of 6D (which is presumably now being driven by an external logic device).  Sleep Mode The states of all digital outputs are maintained while the DT80 is asleep. Note also that the RELAY output uses a latching relay, so no extra current is required to hold it in the closed state. PAGE 338  Schedule Triggers Counter channels can be configured to trigger a schedule when the counter reaches its specified wrap value (at which point it resets to 0). See Trigger on External Event (P53) for more details. For example, RA2C(10) 1TK will measure a temperature on every 10th pulse received on digital input 2D.  Presetting Counters The count value for a digital input channel can be preset using an expression, e.g. RA1M 8C=1000 RB2S 8C will reset the counter to 1000 once per minute. PAGE 339 Channel Options The following channel options are applicable to high speed counters: • • • the channel factor specifies a counter "wrap value", as for the low speed counters. The counter will reset to 0 (or "wrap around") when this value is reached. R (reset): Counter will be cleared to 0 after returning its current value, as for the low speed counters. LT (low threshold): This option is only applicable to counter inputs 1C and 2C (i.e. counter channels 1HSC and 2HSC). PAGE 340 For example, if the average counter input frequency is 100Hz then the DT80 must be programmed to wake at least every 65536/100 seconds (about every 10 minutes). This can be done by including a 10-minute schedule in the job, e.g. RA10M 1HSC(W) Most of the other comments made above regarding digital input counter channels apply equally to the high speed counter channels. For example, HSC channels can be preset to a particular starting value (e.g. PAGE 341 Phase Encoder Operation The following diagram illustrates how the reported PE position values relate to the phase encoder pulses received on the counter inputs. In particular, note that a pulse is counted on each edge of the A and B inputs. This is sometimes referred to as "x4" mode, because if the encoder speed is such that it generates a 100Hz pulse train on its A and B outputs then the DT80's position count will increment at 400Hz. PAGE 342  Frequency Measurement The R channel option can be used to measure the frequency of an input signal, e.g. RA1S 1HSC(R,RS) will return the frequency in Hz of an input signal on channel 1C, while RA10S 1HSC(R,RS) will do the same thing but resolve down to 0.1Hz. The RS option divides the channel value (number of pulses) by the time since the last sample, yielding a frequency. This technique can also be used for the digital input channels (1D-8D), e.g. PAGE 343 Testing and Configuring an SDI-12 Device SDI-12 Address The first task is to determine the address of the sensor. All SDI-12 sensors are able to be set to one of at least ten different addresses. Depending on the sensor, this may be done by: • changing a hardware setting, e.g. PAGE 344 In Measure On Demand mode the DT80 must send a request then wait until the measurement is ready, which may be immediate or it may take several seconds – depending on the sensor. During this time no other schedules will run, and no commands will be executed (similar to a DELAY channel). Measure On Demand mode is most suitable in applications where the sensor is being polled infrequently. This mode minimises system power usage because the sensor only takes a measurement when it is requested to. PAGE 345 Rnnn Settings Some sample settings for the Rnnn channel option are shown below: Option Data Value (Register) to Read (none) First data value in default register set (register set #0) R001 (or R1) R019 (or R19) R100 R101 R344 First data value in default register set (register set #0) th 19 data value in default register set (register set #0) not valid First data value in register set #1 th 44 data value in register set #3 For example, suppose a particular SDI-12 device measures 9 different quantitie PAGE 346 Other Considerations Execution Time In Measure on Demand mode, SDI12 channels may take a significant amount of time to execute – often 10 seconds or more, depending on the sensor. During this time no other schedules or commands are executed. Note however that the DT80 will only request a measurement of a given register set once per schedule. So the following schedule: RA1M 5SDI12(R1) 5SDI12(R3) 5SDI12(R201) 5SDI12(R4) would execute as follows: 1. PAGE 347 Note: that the value returned by the channel is the special "NotYetSet" error value (see Data Errors (P401)) The main things to check here are: • cabling (Is the sensor powered?) • correct SDI12 channel number (In the above example the SDI-12 data wire should be connected to digital input 8D) • correct SDI-12 address (In the above example the device should have been configured for address 0) This error message may also indicate an address conflict – a response was received from the sensor but it was PAGE 348 Generic Serial Channel The DT80’s Serial Channel can be used to connect to serial input and/or output devices such as a serial sensor, GPS terminal, printer, barcode reader, display panel, PLC, or even to another DT80. A serial channel • can transmit programmable ‘prompt’ or ‘poll’ messages to serial devices and interpret their replies • can respond to asynchronous incoming serial messages. PAGE 349 SERIAL is actually a channel type, in the same way that V (voltage) is a channel type. It can appear in schedules and it has channel options, like any other channel type. The control_string is a special channel option which applies only to the SERIAL channel type. Note: An error message will be returned if you attempt to define an nSERIAL channel and the selected port's function has not been set to SERIAL in the DT80 profile. PAGE 350 Serial Data Transmission and Reception If a job contains one or more SERIAL channel definitions then the selected serial ports (host and/or serial sensor) are activated. Data may then be received from a connected serial device at any time whilst the job is loaded. As data is received, it is stored in an area of memory called the serial channel receive buffer. A separate receive buffer is maintained for each serial port. When a SERIAL channel is evaluated (i.e. PAGE 351 Control String – Output Actions The table below lists the ways in which prompts and text strings can be sent from the DT80 to the device connected to the Serial Channel. These commands must be enclosed by {} in the control string. What to output Output Action syntax Description A sequence of characters to be sent. Non-printable characters may be specified using \nnn (where nnn is the ASCII code, 1-255). ^char notation may also be used for control characters (ASCII 1-31), see ASCII-Decimal Table (P389). PAGE 352 The precision value means different things depending on the conversion type: Type d, x, X, o (integer) e, E, f (floating point) g, G (mixed) c (single character) s (string) precision term specifies: Default minimum number of digits to print (leading zeroes will be added if necessary) no minimum number of digits to the right of decimal point 6 digits number of significant digits shown 6 digits not applicable maximum number of characters from the string to print no maximum  Variable Width & Preci PAGE 353 Control String – Input Actions The table below lists the commands available to interpret the information coming back into the Serial Channel from the serial device. Input actions are not enclosed by {} in the control string. Expected data Characters Control signal state (Wait) (Erase receive buffer) Input Action syntax Description text For each character in the input action string, the DT80 will read and discard all incoming characters from the serial device until that particular character is seen. PAGE 354 • • • • Conversions which may be terminated by whitespace(P433) (%f, %d, %x, %o, %i and %S) will skip over any leading whitespace, e.g. %d will match input strings of "123", " 123" and " \013\013\010 123". The %i conversion assumes that the value is hexadecimal if it starts with 0x or 0X, octal if it starts with 0 (zero), otherwise decimal. The %f conversion will accept numbers in standard (e.g. –12.39904) or exponential (e.g. -1.239904e01) format. PAGE 355 For example, if the control string is 1SERIAL("%d"): Input data Result "abc" "123" "123 " "123abc" Scan Error (return NotYetSet; abc left in receive buffer) Receive Timeout (return NotYetSet, nothing left in receive buffer) return 123 (" " left in receive buffer) return 123 (abc left in receive buffer) Control String – Example The control string in the Serial Channel command 1SERIAL("\e{WN\013}%d[1CV],%f[2CV]{C\013}\w[2000]") specifies the following output and input actions for supervising electroni PAGE 356 Triggering Schedules Sometimes the serial device connected to the Serial Channel returns data unsolicited, and so the program must be capable of responding to the device at any time. PAGE 357 Only one communications port can be in SSDIRECT mode at any one time. So if you send SSDIRECT via the USB port (thereby setting that port to SSDIRECT mode), then send another SSDIRECT command via a TCP/IP (Ethernet) connection, then an error message will be returned and the second SSDIRECT command will be ignored. In order to establish SSDIRECT mode on the TCP/IP connection it would be necessary to first send the ENDSSDIRECT command. PAGE 358 and RxBuf= respectively – also any schedules that are triggered by received characters. The number after the +, - or = character indicates the number of characters in the buffer. Using the weighing machine example discussed earlier: P56=1 RA1-E 1SERIAL("\e{WN\013}%d[1CV],%f[2CV]{C\013}\w[2000]") 1SERIAL: RxBuf=0[] 1SERIAL: InputAction: "\e" 1SERIAL: OutputActions: "WN\013" 1SERIAL: Tx [WN\013] 1SERIAL: InputAction: "%d[1CV]" 1SERIAL: RxBuf+12[0242,1.988\013\010] 1SERIAL: RxBuf-8[,1. PAGE 359  Reading Fixed Width ASCII In this case a simple serial sensor continuously transmits a stream of records which consist of an A character followed by four 4-digit fixed point (2 decimal place) temperature values (2209 represents 22.09, for example). This job samples the stream every 30 seconds and logs the values it reads. BEGIN"SPOT" PS=RS232,1200,7,E,1 RA30S 1SERIAL("\eA%4d[1CV]%4d[2CV]%4d[3CV]%4d[4CV]",W) 1..4CV(. PAGE 360  Output to Serial Printer/ Display The serial channel can also be used to output selected channels to a serial printer or display. This job will measure two voltages once a minute and print the values to a serial printer: BEGIN"SOUP" RA1M 1V(W,=1CV) 2V(W,=2CV) 1SERIAL("{%9.3f[1CV] mV END %9.3f[2CV] mV^M^J}",W)  Output to Another DT80 You can also connect a serial channel to the RS232 host port on a second DT80 (or other dataTaker model). PAGE 361 Modbus Channel Not available on DT81/82E About Modbus Modbus is a simple communications protocol which is widely used in SCADA (supervisory control and data acquisition) systems. Modbus provides an efficient and standardised way to transport digital states and data values between a remote terminal unit (RTU) or programmable logic controller (PLC) and a supervisory computer. Servers and Clients In a Modbus-based SCADA system, each RTU/PLC acts as a Modbus server, or slave. PAGE 362 Host RS232 Port The host RS232 port can also be used for controlling a Modbus sensor. This is configured in a similar way: PROFILE HOST_PORT FUNCTION=MODBUS_MASTER Note that because RS232 is a point-to-point connection, only one Modbus device can be connected to this port. As with the serial sensor port, you may need to change the configured baud rate or other settings. For more details on setting up the port and the possible wiring configurations, see Host RS-232 Port (P195). PAGE 363 DT80 #1 is set up as a Modbus client, or master, device. It has no physical sensors of its own connected (although it could have); its job here is to retrieve measurements from the four slave devices and log them. There also happens to be a Modbus HMI (Human-Machine Interface) device connected. This is also a client/master device, which, like DT80 #1, regularly scans the sensors. It then presents this data as a mimic display. PAGE 364 When the channel is executed, the DT80 will send a "read" request to the specified device, wait for its response, do any requested scaling or statistics on the returned value, then log or return the final reading. To write a value, an expression is specified, as you would when setting a channel variable. For example, 1MODBUS(...)=1CV*2 will set the required register on the required Modbus slave device (as specified in the channel options) to the value of 1CV multiplied by 2. PAGE 365 The following options specify how the DT80 should interpret the contents of a Modbus register, or pair of registers: • • • • • • MBI - 16 bit signed integer (default) MBU - 16 bit unsigned integer MBL - 32 bit signed integer transferred using two consecutive 16 bit registers MBF - 32 bit IEEE-754 floating point value transferred using two consecutive 16 bit registers MBLE - 32 bit signed integer transferred using "Enron Modbus" protocol variant MBFE - 32 bit floating point value transferred using "Enron PAGE 366 In this case the DT80 will send a Modbus request to read input registers #1-50 to the Modbus slave at address 127.0.0.1. This address is a special "loopback" IP address, which will actually be received by the DT80 itself. The DT80 Modbus server will then process the request in the normal way. As indicated in the table in Accessing DT80 Channels via Modbus (P177), input registers #1-1000 are mapped onto 1CV-1000CV, so the DT80 will reply to the request with the values of 1CV-50CV. PAGE 367 • Ensure that there are no other Modbus master devices on the same serial network as the DT80. (For a TCP/IP network multiple Modbus master devices can be present.) • If transactions are failing intermittently, electrical noise may be disrupting the network. If this cannot be rectified then it may help to use the RTn channel option to tell the DT80 to retry failed transactions a few times. PAGE 368 Technical Details & Troubleshooting DT80 Analog Sub-System This section provides some technical details on the internal operation on the DT80's analog measurement sub-system. This will allow the interested user to better understand its characteristics. A simplified block diagram of the DT80/81's analog sub-system is shown below. In this diagram the circle-X symbols indicate relay contacts which can connect or disconnect the indicated points. PAGE 369 Ground Terminals The DT80's analog section is electrically isolated from the rest of the unit. There are therefore two separate ground references – digital ground and analog ground. The DT80's front panel label further reinforces the separation of the analog and digital sections: Figure 170: The DT80 has two ground systems Isolating the analog and digital sections means that sensor-to-equipment ground loops (see Ground Loops (P372)) are unlikely to arise. PAGE 370 Input Termination The DT80's instrumentation amplifier has a very high input impedance. With such devices, it is necessary to provide a path to allow the device's inherent "bias current" to flow to ground. If this is not done then the inputs will "float", possibly causing significant inaccuracies. For the DT80/ 81, when a measurement is made relative to the # terminal (e.g. PAGE 371  External Sources Alternatively, an external excitation source may be provided. There are two options here: • The source can be connected directly to the sensor. The DT80 then measures the required voltage. As far as the DT80 is concerned, it is just measuring a voltage; it is not concerned with providing excitation. The N (no excitation) channel option may therefore be used to indicate this configuration. For example, refer to the bridge wiring diagram: B1 – 6-Wire BGV Inputs (P312). PAGE 372 To summarise: the DT80 has certain temperature-stable characteristics, whose absolute values are measured and recorded during manufacture. This process corrects for any differences between individual units. Using these characterised values, further measurements are taken during operation to correct for differences between the current temperature and the temperature at which the factory characterisation was performed. PAGE 373 Avoiding Ground Loops For each type of ground loop, the basic strategy is to break the ground loop.  Isolation The design of the DT80 helps eliminate ground loops between the sensors and the DT80/ computer, because the DT80 provides over 100V of isolation between the analog section (which connects to analog sensors) and the digital section (which connects to digital devices and computers). PAGE 374 Getting Optimal Speed from Your DT80 In applications where it is important to sample as rapidly as possible, the following guidelines may assist: • • • • • • • Switch off data return and logging for channels you are not interested in. Set P21=1 so that the analog power supply is always on. This prevents the 50ms warm-up delay which can occur if there is any gap between schedule execution. PAGE 375 Part P – The CEM20 Figure 172: A CEM20 module (left), shown connected to a DT80 What is the CEM20? The dataTaker CEM20 (Channel Expansion Module) is an analog multiplexer specially designed to work with DT80 series data loggers. Each CEM20 provides 20 additional analog channels. Up to five CEM20s can be connected to a DT80 and sixteen to a DT85, giving a total of 100 and 320 analog input channels respectively. PAGE 376 The following diagram shows the required wiring in detail. In this case a DT80 is shown connected to two CEM20s. Several K-type thermocouples are also shown, connected to analog inputs on the CEM20s and on the logger itself. PAGE 377 • In the diagram, the two CEM20s have been assigned addresses 1 and 2. However any addresses could have been chosen. The only rule is that a CEM20 with address n must have its analog output connected to analog input n on the DT80. CEM20 Addresses CEM20s are identified by their address, which is set using the 4-way DIP switch on the end plate of the CEM20. Each CEM20 must be set to a unique address before installation. PAGE 378 CEM20 Temperature Reference Each CEM20 includes a precision RTD temperature sensor. This is used to measure the reference junction temperature when thermocouple measurements are performed using the CEM20's analog inputs (see Temperature – Thermocouples (P315)). This process is automatic and is part of the normal thermocouple measurement process. A CEM20's internal temperature sensor can be read at any time (for testing purposes) using the nREFT channel, where n is the CEM number (1-16). PAGE 379 Part Q – Reference DT80 Series Specifications Analog Inputs Max Number of Inputs Input Type DT80 DT85 DT80 + 5 x CEM20 DT85 + 16 x CEM20 2 5 16 100 320 4 10 32 200 640 6 15 48 300 960 DT81 DT82 3-wire & 4-wire independent inputs 1 2-wire independent inputs 2 2-wire shared terminal inputs 3 Supported Measurement Types • Voltage • Current and 4-20mA current loop (internal or external shunt) • Resistance (2, 3, 4 wire; max 1MΩ) • Ratiometric resistance e.g. PAGE 380 Accuracy Maximum measurement error is given by: 𝑬𝒓𝒓𝒐𝒓 = (𝑹𝒆𝒂𝒅𝒊𝒏𝒈 ∗ 𝑩𝒂𝒔𝒊𝒄 𝑨𝒄𝒄𝒖𝒓𝒂𝒄𝒚) + (𝑭𝒖𝒍𝒍 𝑺𝒄𝒂𝒍𝒆 𝑹𝒆𝒂𝒅𝒊𝒏𝒈 ∗ 𝟎. 𝟎𝟏%) where Basic Accuracy is as specified in the following table: Measurement 5ºC to 40ºC -40ºC to 70ºC DC voltage measurement (up to ±30 V) ±0.1% ±0.35% DC voltage measurement (±50 V – Series 4 only) ±0.15% ±0.35% DC current measurement ±0.15% ±0.45% DC resistance measurement (up to10,000 Ω) ±0.1% ±0.35% DC resistance measurement (1,000,000 Ω – Series 4 only) ±0. PAGE 381 Input Characteristics Terminal 1D-4D (1D-3D for DT81/82) 5D-8D (4D for DT81/82) Limit min typ max unit Input terminal voltage -0.6 - 30 V Input high voltage 2.2 - - V Input low voltage - - 0.8 V Input terminal voltage -0.6 - 20 V Input high voltage 2.2 - - V Input low voltage - - 0.8 V - 25 Hz Low speed counter input frequency Low speed counter input pulse width 20 - ms Warning: Exceeding input voltage limits may cause permanent damage. PAGE 382 SDI-12 • Supports SDI-12 protocol versions 1.0 through 1.3 (auto-sensing) • Measure on Demand and Continuous Measurement modes • Includes facility for directly interrogating sensors for diagnostic purposes Generic Serial Sensor Channel • Allows data to be logged from a wide range of smart sensors and data streams. PAGE 383 Integrated Modem (DT8xM only) • Cellular Networks: DT8xM3 models: GSM (2G), GPRS/EDGE (2.5G), WCDMA (3G), DSDPA/HSUPA (3.5G) DT8xM2 models: GSM (2G), GPRS/EDGE (2.5G) • Frequencies: DT8xM3 models: quad-band 2G (850/ 900/ 1800/ 1900MHz), tri-band 3G (850/ 1900/ 2100MHz) DT8xM2 models: quad-band 2G (850/ 900/ 1800/ 1900MHz) • Subscriber Identity Module: Standard format SIM slot (1. PAGE 384 System Display and Keypad • Type: LCD, 2 line by 16 characters, backlight. • Display Functions: channel data, alarms, system status. • Keypad: 6 keys for scrolling and function execution. • Status LEDs: 4 (Sample, Disk, Attention, Power) Firmware Upgrade • RS232, Ethernet (FTP), USB or USB disk. Real Time Clock • Resolution: 0. PAGE 385 CEM20 Specifications Interfaces • Power/Control inputs: 12Vdc, ground, serial data, serial clock (from logger or previous CEM20) • Power/Control outputs: 12Vdc, ground, serial data, serial clock (to next CEM20) • Analog output: (to logger channel corresponding to CEM20 address) • 20 x 4-wire analog inputs Connections • Max total cable length between data logger and furthest CEM20: 100m • Max supported CEM20 units per data logger: DT80 (Series 2 or later): 5 DT85 (Series 2 or later): 16 DT81/ 82: PAGE 386 Command Summary The following table lists all commands supported by the DT80. It does not include: • Channels definitions (P33) • Schedules definitions (P48) • Alarms definitions (P82) Command 'comment text Description comment, remainder of line is ignored by DT80 Page COPY srcfile ftp-uri upload file srcfile to FTP server download file from FTP server and write to destfile 62 56 262 262 93 93 93 61 61 123 276 276 277 277 253 116 116 116 COPYD option=value option=value.. PAGE 387 HRESET generate a hardware reset of the DT80 IP return DT80 IP address PROFILE section key return current value of specified profile key PROFILE section= set all profile keys in section to defaults PS return current serial sensor port parameters 273 273 233 233 233 98 63 276 94 94 94 94 218 69 270 260 260 186 186 90 195 195 221 264 264 264 264 264 264 198 set serial sensor port parameters (all parameters are optional) 198 terminate an unload 110 79 115 116 273 62 64 64 65 123 343 277 227 203 1 PAGE 388 TEST return a test report TYPE file return contents of a text file UEVTLOG return contents of event log TESTn return line n of the test report UERRLOG return contents of error log UNLOCKJOB jobspec allow specified job(s) to be overwritten when a new job is entered USER username list the user account USER username ACTION=DEL removes user account from the device WHO displays the current logged in username USER lists all user accounts USER username PASS=password create or change password f PAGE 389 ASCII-Decimal Table Decimal ASCII Control 0 NUL 1 SOH 2 STX 3 ETX 4 EOT 5 ENQ 6 ACK 7 BEL 8 BS 9 HT ^A ^B 35 ^D ^E 36 37 ^F acknowledge 38 ^H bell 39 backspace 40 tab 41 ^G ^I ^J LF 11 VT 12 FF 13 CR ^M 14 SO SI ^N 15 16 DLE 17 DC1 18 DC2 19 DC3 20 DC4 21 NAK SYN 34 ^C 10 22 Description Decimal ASCII Description Decimal ASCII Description Decimal ASCII Description @ ` null 32 space 64 96 back quote ! A a 33 65 97 ^K ^L line feed 42 vertical ta PAGE 390 Decimal ASCII Description 128 € 129 130 131 132 133 134 135 136 137 138 139 140 ‚ 142 not used 163 164 … 165 † 166 ‡ 167 ˆ 168 ‰ 169 Š 170 ‹ Ž 161 162 „ 141 171 172 not used 173 174 143 not used 175 144 not used 176 145 146 147 148 149 150 151 152 153 154 155 156 ‘ 159 178 " 179 " 180 • 181 – 182 — 183 ˜ 184 ™ 185 š 186 › 157 158 177 ’ œ ž Ÿ ASCII 160 ƒ Œ Decimal 187 188 not used 189 190 191 ¡ ¢ £ ¤ ¥ ¦ § ¨ © ª « ¬ ® ¯ ° ± ² ³ ´ µ ¶ · ¸ ¹ º » PAGE 391 Table 22: LCD Characters Set This table lists the characters that can be displayed on the DT80's LCD. Note the differences between this character set and the previous set. Thus to display a sigma symbol (Σ) on the LCD you would use \246 (240+6) in an alarm text or channel name/ units string. Note that the DT80 automatically translates the standard units strings degC, degF, degR and Ohm to °C, °F, °R and Ω when displaying on the LCD. PAGE 392 RS-232 Signals The following table lists the standard RS-232 pinouts for both 9-pin (DE-9) and 25-pin (DB-25) DCE and DTE interfaces. Normally the DTE (DT80, computer) device’s connector is male and the DCE (modem) device’s connector is female. PAGE 393 Host Port modem cable If a DTE is connected to a DCE then a "straight-through" cable is used. The following cable (dataTaker product code MOD-6) is used to connect between the DT80 host port and a modem. PAGE 394 Upgrading DT80 Firmware The DT80’s "operating system" (or firmware) is stored in the DT80’s Flash memory. This means that you can easily upgrade your DT80’s firmware: • using a USB memory device, or • from a host computer running DeTransfer, or • using an FTP client It is strongly recommended that you keep your DT80 up-to-date with the latest firmware. Firmware files are available for free download from www.datataker.com in the Support/ Downloads area. PAGE 395 Firmware Upgrade – USB Flash Device The simplest way to upgrade the DT80 firmware is by using a USB memory device. This is also convenient if you have several loggers to upgrade. 1. Obtain the appropriate firmware upgrade zip file from www.datataker.com or your dataTaker representative. This file should have a –usbdisk suffix. 2. Extract all files from the zip file into the root directory of a USB memory device. 3. If a USB or RS232 cable is connected to the logger, disconnect it. 4. PAGE 396 Firmware Upgrade – Remote TCP/IP The following method can be used to upgrade a DT80 via a remote TCP/IP connection (Ethernet or PPP). 1. Obtain the appropriate firmware upgrade zip file from www.datataker.com or your dataTaker representative. This file should have a –usbdisk suffix. 2. Extract all files from the zip file into a convenient temporary folder. 3. Load the dEX web interface and open the command window. Alternatively, run DeTransfer and make a TCP/IP connection to the logger. 4. PAGE 397 Error Messages Standard Messages The DT80 returns a message when it detects an error in a command, or an operational difficulty. The form of the error report is controlled by the /U switch. The default is the verbose form shown in the table below. If the switch is set to /u the error message is reduced to an error number (e.g. E3). (Note this Switch also reduces the verbosity of other returned data). Error messages can be switched off by the /m switch. The default is for errors to be reported (/M). PAGE 398 Error Category Error Number – Description • Cause/Action Syntax E37 – No current job • A command was entered that operates on the current job, but there is no job currently loaded. PAGE 399 Error Category Error Number – Description • Cause/Action Syntax E105 – Invalid PROFILE section/key name • Check spelling of section and key name in PROFILE command E106 – Invalid PROFILE value • Check that value being set in PROFILE command is valid Memory Reading Hardware   E107 – Counter is already used as a trigger • Operation  The specified counter is already used as a schedule trigger and cannot be used again. PAGE 400 Error Category Error Number – Description • Cause/Action Syntax E127 - Modbus IP address specified on serial channel E128 - Modbus serial address specified on TCP/IP channel • or no address specified Operation E130 - Modbus - unexpected function id in response  E131 - Modbus - exception response received • E133 - Modbus - reading values to CVs prevents writing • MODBUS channel cannot write values from CVs and also assign to CVs E134 - Modbus - 32 bit format not applicable to discrete transfer • PAGE 401 Error Category Error Number – Description • Cause/Action Syntax Operation Memory Reading Hardware E160 – Invalid password – detailed msg • The password is invalid E161 – User accounts limit – detailed msg •  Cannot create a user account as soon as maximum number of account in the user’s database reached. PAGE 402 DT80 Abnormal Resets If a serious internal hardware or firmware failure occurs, the DT80 will normally force a hardware reset (equivalent to a HRESET command). A message will be displayed on the LCD (e.g. SW Exception) and the Attn LED will flash until a keypad button is pressed. Additional technical details about the cause of the reset will generally be logged to the DT80's event and error log files. You can view these files using the UEVTLOG and UERRLOG commands, or via the web interface. PAGE 403 Glossary  4–20mA loop A common industrial measurement standard. A transmitter controls a current in the range of 4 to 20mA as a function of a measurement parameter. Any receiver(s) or indicator(s) placed in series can output a reading of the parameter. Main advantage is 2-wire connection and high immunity to noise pick-up. Usually powered from a 24V supply.  50/ 60Hz rejection The most common source of noise is that induced by AC power cables. This noise is periodic at the line frequency. PAGE 404  Auto-ranging The process of changing amplifier gain automatically so that the signal is amplified as much as is possible without exceeding output limits.  base date and time The DT80’s base date is 0:00:00 on 01/01/1989. All timestamps are stored as offsets from this point in time.  bit The smallest unit of information in a computer. A bit has a single value: either 0 or 1. Computers generally store information and execute instructions in bit-multiples called bytes. PAGE 405  command line One or more DT80 commands typed one after the other, separated by tab, space or semi-colon characters, and ending with a return character. Limited to a maximum of 1023 characters. For example RA10S T 4V 5TK is a command line made up of a schedule definition followed by three channel definitions (separated by spaces).  common-mode voltage An unwanted AC and/or DC voltage that offsets both inputs to the DT80’s instrumentation amplifier (with respect to amplifier ground). PAGE 406  dataTaker The name of the family of stand-alone data logging, acquisition and associated equipment manufactured by Thermo Fisher Scientific. PAGE 407  DTE Data Terminal Equipment. The information source and/or destination in an RS 232 communications link. The DT80’s Host RS 232 port and Serial Channel are DTE devices, as is a PC’s RS 232 port (serial port). The RS232 standard was originally designed for connecting a DTE to a DCE (e.g. a modem). However, a DTE can also be directly connected to another DTE by means of a null-modem cable  DTUsb Windows-based driver that provides a TCP/IP connection to the logger over USB. PAGE 408  ground loops More often that not, grounds in a measurement system are not at the same electrical potential — differences may be from microvolt to many volts. Then, if signal wires happen to connect different grounds together, currents can flow and result in unpredictable measurement errors. These unintended conduction paths are referred to as ground loops. The DT80 has been designed for maximum immunity to ground loops — see Ground Loops (P372). PAGE 409  mA Milliamp, 10-3 A  MB Megabyte, 1048576 bytes  Mbps Megabits per second  Modbus A widely used control and automation communications protocol, often used in SCADA systems.  Monolithic sensors Also called IC (Integrated Circuit) sensors. Sensors that are constructed on a single piece of silicon using integrated circuit fabrication techniques. PAGE 410  peak-to-peak The value of an alternating quantity measured from its negative peak to its positive peak. Figure 180: Peak-to-peak measurement  period  The time taken for a cyclic event to repeat itself. Reciprocal of frequency: 1 𝑃𝑒𝑟𝑖𝑜𝑑 = 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 PLC Programmable Logic Controller. Used to automate monitoring and control of industrial equipment.  plug-and-play A device whose characteristics are automatically determined when it is plugged in. All USB devices are plug-andplay. PAGE 411  retrieve To unload or return data and other information from the DT80 to the host computer, either by:  • Unloading through one of the DT80’s communications interfaces • Unloading by temporarily inserting a USB memory device into the DT80 ROM Read Only Memory. Memory that can be randomly read from but not normally written to. The DT80 uses flash ROM.  RS 232 A common communications and interface standard for connecting two serial devices in a point to point configuration. PAGE 412  stand-alone Not connected to a host computer. The DT80 is designed to operate in stand-alone mode: once programmed, you can disconnect the DT80 from the host computer leaving the DT80 operating totally independently. Later, to download data or reprogram the DT80, you reconnect the host computer.  state Of an alarm: the true/false result of an alarm test.  SWFC Software flow control (XON/XOFF). Also known as software handshaking. See Software Flow Control (P194). PAGE 413  V Volt, a unit of electrical potential (voltage)  version number The version number of the DT80’s firmware consists of a major number, a minor number and a build number, e.g. for Version 6.18.0002, the major number is 6, the minor number is 18 and the build number is 2.  vibrating wire strain gauge a sensor for measuring strain, which works by detecting changes in the resonant frequency of a steel wire as its length changes. PAGE 414 Safety Information General • Ensure that all voltage input limits as specified in the DT80 Series Specifications (P379) are strictly adhered to. • All sensors and other wiring connected to the logger are classed as extra low voltage circuits. These must be separated from any hazardous voltage circuits (e.g. mains) wiring by double or reinforced insulation and physical separation, as required by the local wiring code. • The DT80 is powered by a 10-30V DC supply. PAGE 415 Index 12V terminal............................................................. 290 5VSW terminal ................................................. 290, 291 AGND terminal ......................................................... 290 Alarm Action Text.............................................................. 49 Display .................................................................. 119 Analog Channels Attenuators ............................................................ 44 Gain .................... PAGE 416 IPSN .............................................................. 233, 240 LOG ....................................................................... 276 MODEM ................................................................ 218 NTP ....................................................................... 272 PING ...................................................................... 221 PROFILE................................................................. 264 PS ........................................ PAGE 417 Monitoring ............................................................ 292 Outputs ........................................................... 36, 290 PPP ........................................................................... 246 Connecting............................................................ 253 Direct Cable .......................................................... 248 Modem ................................................................. 251 Profile Settings ................................ Who We Are About Us Company Careers Terms & Privacy Resources List of Manufacturers Support For the Press Media assets FAQ Get in touch Blog Email DMCA ManualShelf © 2013-2024