Campbell-scientific CS450/CS455 Pressure Transducer Uživatelský manuál Strana 15

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CS450/CS455 Pressure Transducer
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,
Using the A200).
Upon setup, HyperTerminal will request you enter the Communication
connection; it defaults to a phone connection. Change the communication to
the appropriate “Com” in the “Connect Using” box (see Section 3.1.1.4,
Determining which COM Port the A200 has been Assigned, 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.
9
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