Campbell CS225, Инструкция по эксплуатации

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CS225 Temperature String
17
CallTable Daily
CallTable MetaData
CallTable TempSample
NextScan
EndProg
7.5 Changing the SDI-12 Address Using LoggerNet and a
Datalogger
It is possible to connect multiple CS225 or other SDI-12 sensors to a single
datalogger control port. Each temperature sensor in the CS225, or output from
another SDI-12 device must have a unique SDI-12 address (See Table 7-4 SDI-
12 Addresses & Positions).
The factory-set SDI-12 addresses for the CS225 start at 1 and continue until the
last temperature sensor. The CS225 SDI-12 address is changed in software by
issuing the aAb! command to the CS225 over the SDI-12 interface, where
a is
the current address and b is the new address. The current addresses of the
individual sensors can be found by issuing the a! command.
Campbell Scientific dataloggers (with the exception of the CR5000) support a
method of directly interacting with SDI-12 sensors via a terminal emulator.
This allows you to get confirmation that the change of address has worked,
using the a! command. This can be done using a computer running LoggerNet
to issue any valid SDI-12 command through the datalogger to the CS225 as
described in the following sections.
7.5.1 CR1000 & CR800 series Dataloggers
1. Connect the CS225 to the datalogger using Control Port C1 or C3 as
described in Section 7.1,
Wiring . Be sure the datalogger is not running a
program that contains the SDI12Recorder() instruction on the port used.
2. Assuming that the datalogger is configured in Setup and able to
communicate via LoggerNet, navigate to the Connect Screen. Select
Terminal Emulator under the Datalogger menu. The “Terminal Emulator”
window will open. In the Select Device menu, located in the lower left-
hand side of the window, select the station.
3. Click on the Open Terminal button.
4.
Press the <enter> key until the datalogger responds with the “CR800
prompt. Type “SDI12” and select the appropriate port.
5. If the CS225 temperature sensor addresses are unknown, then conduct a
query for each sensor’s current SDI-12 address with the “aI!” command.
If no characters are typed within 12 seconds, then the mode is exited. Once
a complete list of addresses is gathered you will know what block of
addresses are required in order to readdress the CS225. You will also be
able to request the related metadata so that sensor locations are confirmed.
Be sure to reference Table 7-4 for a list of appropriate addresses.