2 sdi-12 commands, Sdi-12 commands, 2. connect screen – Campbell Scientific CS451/CS456 Pressure Transducer User Manual

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CS451/CS456 Submersible Pressure Transducer

FIGURE 8-2. Connect screen

There are three settings that can be changed: SDI-12 address, Pressure/Level

Units, and Temperature Units. Double-click on the window of the units to be

changed. This will open a pick menu box. Select the desired units and

Apply

the changes.

8.2 SDI-12 Commands

This section briefly describes using the SDI-12 commands.

Additional SDI-12 information is available at Appendix D,

SDI-12 Sensor Support,

, or

The CS451/CS456 uses an SDI-12 compatible hardware interface and supports

a subset of the SDI-12 commands. The most commonly used command is the

aM! command, issued by the datalogger, where a represents the sensor

address. The communication sequence begins with the datalogger waking the

sensor and issuing the

aM! command. The transducer responds to the

datalogger indicating that two measurements will be ready within two seconds.

Subsequent communications handle data reporting from the sensor to the

datalogger.

The SDI-12 protocol has the ability to support various measurement

commands. The CS451/CS456 supports the commands that are listed in

NOTE