Campbell CS475, Instruction Manual

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Appendix C. SDI-12 Commands/ Changing Settings
C-9
TABLE C-11. Checking CRC Example
Initial Command Response
0V!
Where 0 is the sensor’s
address.
00013<cr><If>
Where (from left to right),
0—sensor’s address;
001—the amount of time (in seconds) that
you must wait before sending the send
data command;
3—the number of values that will be
placed in the buffer.
Subsequent Command Response
0D0!
Where the first zero is the
sensor’s address.
0+0+3320000<cr><If>
Where (from left to right),
0—sensor’s address;
0—CRC check (0 = OK);
1610000—adapter version (1.61.00.00);
3320000—sensor version (3.32.00.00).
C.2 Using Terminal Emulator and a Datalogger to
Send Commands
Commands can be sent to the sensor by connecting the sensor to an SDI-12
compatible central port on a datalogger and use the SDI-12 transparent mode.
C.2.1 SDI-12 Transparent Mode
System operators can manually interrogate and enter settings in probes using
transparent mode. Transparent mode is useful in troubleshooting SDI-12
systems because it allows direct communication with probes. Datalogger
security may need to be unlocked before transparent mode can be activated.
Transparent mode is entered while the PC is in telecommunications with the
datalogger through a terminal emulator program. It is easily accessed through
Campbell Scientific datalogger support software, but is also accessible with
terminal emulator programs such as Windows HyperTerminal. Datalogger
keyboards and displays cannot be used.
The terminal emulator is accessed by navigating to the Datalogger menu in
PC200W , the Tools menu in PC400 , or the Datalogger menu in the Connect
screen of LoggerNet .
The following examples show how to use LoggerNet software to enter
transparent mode and change the SDI-12 address of a sensor. The same steps
are used to enter transparent mode with PC200W and PC400 software after
accessing the terminal emulator as previously described.