Campbell CS455 Manual descarregar pdf (Página 15)

CS450/CS455 Pressure Transducer

responds with a prompt. CR10X and CR510 dataloggers reply with “entering

SDI-12”.

CR10X-PB and CR510-PB dataloggers require “*#n” being entered at the

prompt, where n is the control port being used.

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.

3.1.4 RS-232 Connection via PC Terminal Software

PC terminal software can be used to communicate with the CS450/CS455 via

the RS-232 communication mode. For this example HyperTerminal will be

used (see Figure 3-6).

The CS450/CS455 is connected to the PC via the A200 (see Section 3.1.1).

Upon setup, HyperTerminal 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 3.1.1.4 to

determine the COM port that was assigned to the A200). HyperTerminal will

then prompt for the proper “Port Settings”. These should be:

TABLE 3-3. RS-232 Settings

Bits per Second 9600

Data bits 8

Parity None

Stop bits 1

Flow control None

From the HyperTerminal screen, you will now be able to communicate with

the CS450/CS455. At the prompt, push the ENTER key several times. This

will wake-up the RS-232 mode of the sensor. By default the CS450/CS455 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.

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