Campbell CS451, Инструкция по эксплуатации

Страница: 20 / 36

CS451/CS456 Submersible Pressure Transducer
Now check for response from the sensor with address zero by typing the SDI-
12 Identify command
0I!<Enter> (that’s a zero, not the letter O). The sensor
should respond with an identification string similar to:
013CSI450.Std.01_xxxxxxxx , where xxxxxxxx represents the eight digit serial
number. Note that the SDI-12 standard allows for multiple probes to be
connected to one datalogger control port. For example, if you have another
SDI-12 probe on the C1 that has address 7, you could issue the identify
command
7I!<Enter> .
Only one sensor of the same address can be connected when using the change
address command.
7.1.4 RS-232 Connection via PC Terminal Software
PC terminal software can be used to communicate with the CS451/CS456 via
the RS-232 communication mode (see FIGURE 7-4).
The CS451/CS456 is connected to the PC via the A200 (see Section 7.1.1, PC
Connection Using the A200 ).
Upon setup, the terminal emulator software will request you enter the
Communication connection; defaults to a phone connection. Change the
communication to appropriate “Com” in the “Connect Using” box (see Section
7.1.1.4,
Determining which COM Port the A200 has been Assigned , to
determine the COM port that was assigned to the A200). The software will
then prompt for the proper “Port Settings”. TABLE 7-3 shows the RS-232
settings.
TABLE 7-3. RS-232 Settings
Bits per Second 9600
Data bits 8
Parity None
Stop bits 1
Flow control None
You will now be able to communicate with the CS451/CS456. At the prompt,
push the <Enter> key several times. This will wake-up the RS-232 mode of
the sensor. TABLE 7-4 shows the RS-232 commands that can be entered once
it is in the RS-232 mode.
By default, the CS451/CS456 is in the SDI-12 mode for
communication. Once in the RS-232 mode, if there is no
communication for 20 seconds, the sensor will return to the SDI-
12 mode.
NOTE
14