Operator`s manual

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OV-1

CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW

The CR7 Measurement and Control System combines precision measurement with processing and

control capability in a battery operated system.

Campbell Scientific, Inc. provides three documents to aid in understanding and operating the CR7:

1. This Overview

2. The CR7 Operator's Manual

3. The CR7 Prompt Sheet

This Overview introduces the concepts required to take advantage of the CR7's capabilities. Hands-on

programming examples start in Section OV4. Working with a CR7 will help the learning process, so

don't just read the examples, turn on the CR7 and do them. If you want to start this minute, go ahead

and try the examples, then come back and read the rest of the Overview.

The sections of the Operator's Manual which should be read to complete a basic understanding of the

CR7 operation are the Programming Sections 1-3, the portions of the data retrieval Sections 4 and 5

appropriate to the method(s) you are using (see OV5), and Section 14 which covers installation and

maintenance.

Section 6 covers the details of serial communications. Sections 7 and 8 contain programming examples.

Sections 9-12 have detailed descriptions of the programming instructions, and Section 13 goes into

detail on the CR7 measurement procedures.

The Prompt Sheet is an abbreviated description of the programming instructions. Once familiar with the

CR7, it is possible to program it using only the Prompt Sheet as a reference, consulting the manual if

further detail is needed.

Read the Selected Operating Details and Cautionary Notes at the front of the Manual before using the

CR7.

OV1. PHYSICAL DESCRIPTION

The CR7 features a modular, multiple

processor design that provides precision

measurement and control capability in a rugged,

battery operated system. Control Module

functions include real-time task initiation,

measurement processing, data storage,

telecommunications, and keyboard/display

interaction. The I/O Module performs all analog

and pulse signal measurement functions as well

as the analog and digital control output

functions. The I/O Module contains its own

processor card, a precision analog interface

card, and seven card slots which can

accommodate any combination of I/O Cards.

Sensor leads are connected to the I/O cards via

screw terminals.

A maximum of four I/O modules, separated by

up to 1,000 feet, may be connected to a single

Control Module in applications that require

distributed measurement capability.

OV1.1 700X CONTROL MODULE

Contains the CPU card, with 24K of system

PROM and 40K of RAM; the serial interface

card for peripheral communication and

connection of up to four I/O Modules; and the

keyboard display card. Two slots are present

for optional RAM expansion. The system's 2.5

Ahr lead-acid batteries and AC charging

circuitry are also contained in this module.

The CS I/O 9-pin port provides connection to

data storage peripherals, such as the

SM192/716 Storage Module, and provides

serial communication to computer or modem

devices for data transfer or remote

programming (Section 6). This 9 pin port does

NOT have the same pin configuration as the

Summary of content (17 pages)

PAGE 1
CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW The CR7 Measurement and Control System combines precision measurement with processing and control capability in a battery operated system. Campbell Scientific, Inc. provides three documents to aid in understanding and operating the CR7: 1. This Overview 2. The CR7 Operator's Manual 3. The CR7 Prompt Sheet This Overview introduces the concepts required to take advantage of the CR7's capabilities. Hands-on programming examples start in Section OV4.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW RS232 9 pin serial ports used on many computers. The SDM terminals adjacent to the serial port allow connection to Synchronous Device for Measurement (SDM) peripherals. These peripherals include the SDM-INT8 Interval Timer, the SDM-SW8A Switch Closure Module, the SDM-CD16AC AC/DC Controller, and the SDM-OBDII Engine Controller Interface. 709 512K MEMORY CARD: This card provides RAM storage for an additional 262,126 Final Data values.
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CR 7 CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW F LIE RE CA E LV VA UT PR UN IO N ON TT S BU RE SE FO CA G IN CK ES BE LO FIGURE OV1-1. CR7 Measurement and Control System OV2. MEMORY AND PROGRAMMING CONCEPTS The CR7 must be programmed before it will make any measurements. A program consists of a group of instructions entered into a program table. The program table is given an execution interval which determines how frequently that table is executed.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW ANALOG IPUTS SDM PORTS Input/Output Instructions 1. Volt (SE) 2. Volt (DIFF) 4. Ex-Del-Se 5. AC Half Br 6. Full Br 7. 3W Half Br 9. Full Br-Mex 11. Temp (107) 12. RH-(07) 13. Temp-TC SE 14. Temp-TC DIFF 17.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW INPUT/OUTPUT INSTRUCTIONS Specify the conversion of a sensor signal to a data value and store it in Input Storage. Programmable entries specify: (1) the measurement type (2) the number of channels to measure (3) the input voltage range (4) the Input Storage Location (5) the sensor calibration constants used to convert the sensor output to engineering units I/O Instructions also control analog outputs and digital control ports.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW 3. Final Storage - Final, processed values are stored here for transfer to printer, solid state Storage Module or for retrieval via telecommunication links. Values are stored in Final Storage only by the Output Processing Instructions and only when the Output Flag is set in the users program. The 18,336 locations allocated to Final Storage at power up is reduced if Input or Intermediate Storage is increased. 4.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW Table 1. Execute every x sec. 0.0125 < x < 6553 Table 2. Execute every y sec. 0.1 < y < 6553 Table 3. Subroutines Instructions are executed sequentially in the order they are entered in the table. One complete pass through the table is made each execution interval unless program control instructions are used to loop or branch execution. Table 2 is used if there is a need to measure and process data on a separate interval from that in Table 1.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW OV3.1 FUNCTIONAL MODES User interaction with the CR7 is broken into different functional MODES, (e.g., programming the measurements and output, setting time, manually initiating a block data transfer to Storage Module, etc.). The modes are referred to as Star (*) Modes since they are accessed by first keying *, then the mode number or letter. Table OV3.1 lists the CR7 Modes. TABLE OV3-1.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW OV3.4 INSTRUCTION FORMAT Instructions are identified by an instruction number. Each instruction has a number of parameters that give the CR7 the information it needs to execute the instruction. The CR7 Prompt Sheet has the instruction numbers in red, with the parameters briefly listed in columns following the description. Some parameters are footnoted with further description under the "Instruction Option Codes" heading.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW Tables OV3-1 and OV3-2 summarize the Keyboard Commands and Control Modes used to program the CR7, monitor Input and Final Storage and control data output to peripherals. The instructions, and their associated parameters, are the CR7's programming steps and are used to build the CR7's program. It is not necessary to understand all the commands to proceed with this programming exercise.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW TABLE OV4-1. Thermocouple Measurement Programming Example TURN ON THE POWER SWITCH AND PROCEED AS FOLLOWS: Display ID:Data Key HELLO 01 Display ID:Data Key :0064 * 00:00 1 01:00 A 01:0.0000 2 01:2 A Description The number after "HELLO" will count up as memory is checked. If you have a 512K Memory Card, this can take a long time; key # to abort the test. The result of the CPU board memory check is then displayed (Sect. 1.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW TABLE OV4-2. Using *6 Mode to Observe Example TC Measurements (User with Model 723-T RTD Card) Display ID:Data Key :LOG 1 *6 00:00 0 Display ID:Data 06:0000 01:21.234 02:22.433 01:21.199 :LOG 1 Key A A B * Description Enter *6 Mode, advance to first location Panel temp is 21.234 oC, advance to location 2 TC temp is 22.433 oC, backup to location 1 Panel temp is now 21.199 oC Return to *0 Mode TABLE OV4-3.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW TABLE OV4-4.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW TABLE OV4-5. Using *7 Mode to View Values in Final Storage Display ID:Data Key Display ID:Data :LOG 1 00:00 Key Description * 7 07:9.0000 A 01:0103. A 02:1325. 03:22.57 04:23.43 01:0103. 02:1330. 03:22.61 00:00 A A A A A * 0 :LOG 1 Enter *7 Mode.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW OV5. DATA RETRIEVAL OPTIONS There are several options for data storage and retrieval. These options are covered in detail in Sections 2, 4, and 5. Figure OV5-1 summarizes the various possible methods. Regardless of the method used, there are three general approaches to retrieving data from a datalogger. 1. On-line output of Final Storage data to a peripheral storage device.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW +12 720 I/O MODULE 700X CONTROL MODULE MADE IN USA CAMPBELL SCIENTIFIC INC. LOGAN, UTAH SERIAL I/O ANALOG INTERFACE 6 H L 7 H L 8 H L 1 2 3 4 5 6 7 8 9 H L H L H L H L H L H L H L H L H L 10 H L 11 H L 726 50 VOLT INPUT 1 H 2 H 3 H 1 H L 2 H L 3 H L 4 H L 5 H L 1 CR7 4 MEASUREMENT & CONTROL SYSTEM 2 H 724 PULSE COUNTER I. D.
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CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW OV6. SPECIFICATIONS Electrical specifications are valid for over a -25° to +50°C range unless otherwise specified. Analog Inputs (723T or 723 Card specifications below; 726 ±50 V Card specifications discussed in System Description) Voltage Measurement Types: Single-ended or differential. Range and Resolution: Ranges are software selectable on any input channel.