Instructions

UM-0085-B09 DT80 Range User Manual Page 137
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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.
• There are controls relating to Network Time Protocol (NTP). The DT80 can use NTP to synchronise its internal
system time to a time server on the Internet. See Automatic Time Adjustment (NTP) (P270). If NTP is enabled
then the time zone control must be set appropriately.
Statistics
Any channels which are configured to report statistical values will be sampled at this rate, which should always be faster
than the channel's schedule's trigger rate. See Statistical Report Schedules (P57).
CEM
If your logger has Channel Expansion Modules connected then the Number of CEMs field must be set correctly,
otherwise you will not be able to select the channel number for any CEM-connected sensors.
Note also that the configuration builder assumes that the CEMs' addresses are set sequentially starting at 1. That is, if
you specify that two CEMs are connected then they must be set to addresses 1 and 2.
See The CEM20 (P375) for more details.
Power
This page contains a number of options that can be used to trade off the DT80's speed and availability against power
consumption.
Four aspects of DT80 operation can be controlled on this page:
• Enabling low power sleep mode (see Sleep Mode (P300)) will reduce the DT80 power consumption to very low
levels after a defined period of inactivity and between scheduled measurements. However, during sleep no
communications or other interaction with the logger are possible.
• By default, sleep mode is disabled when the DT80 is externally powered. For applications which use an external
12/24V battery you will probably want to clear this checkbox, so that the DT80 can
sleep while externally
powered.
• Sleep is also disabled by default if an Ethernet or USB cable is connected, because any USB/Ethernet
connection will be lost when the DT80 goes to sleep. You can force the DT80 to go to sleep regardless of cable
status by clearing the "disable sleep if using USB/ethernet" checkbox.
• The DT80's analog measurement subsystem can be powered continuously, or switched on and off as
required (see Analog Warm Up Time (P372)). The latter option saves power, but requires a short "warm up"
time before each group of analog measurements, which will reduce the DT80's maximum sample rate.
• The display backlight can be powered continuously (making the LCD easier to read), or switched on for a
short time following a key press, or not used at all. See Display Backlight (P120).
(NEED TO BE REVISED
DEPENDING ON LCD TYPE USED)
• The 12V power output can be enabled continuously (possibly also during sleep mode), or it can be configured
to automatically switch on when a CEM measurement is required. See Controlling 12V Power Output (P290).
At the bottom of the page, a bar graph shows the relative power consumption of the selected settings. This is intended as
a guide only, and the power increments shown on the graph are not to scale
.
Security
Allowing access to the DT80's servers via the Internet can present a security risk. This page allows you to restrict access
to selected DT80 services. See also Security (P257).
• The DT80's command, FTP and Modbus servers can be selectively enabled or disabled. Note that the web
(HTTP) server cannot be disabled via the dEX configuration builder, as dEX requires the web server in order to
function. (Use manual profile commands if you wish to disable the DT80 web server or set these servers to non-
standard TCP port numbers.)
• The FTP server credentials (user name and password) can be set, and you can specify whether read-only
anonymous FTP access to the DT80 is permitted. These credentials are also used when connecting to the
DT80 from a remote PPP client.
• A command server password and timeout can be defined. If a password is set then the DT80 will ignore
anything sent to the command server until the password is sent. See Password Protection (P186).