METER TEROS 21 - SDI-12 Communication Setup

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TEROS 21
The SDI-12 protocol requires that all sensors have a unique address. TEROS 21 sensors
factory default is an SDI-12 address of 0. To add more than one SDI-12 sensor to a bus, the
sensor address must be changed as described below:
1. Using a ProCheck connected to the sensor, press the Menu button to bring up the
CONFIGmenu.
NOTE: If the ProCheck does not have this option, please upgrade its firmware to the latest version from the METER
Legacy Handheld Devices webpage.
2. Scroll down to SDI-12 Address. Press Enter.
3. Press the UP or DOWN arrows until the desired address is highlighted.
Address options include 0...9, A…Z, and a…z.
4. Press Enter.
Detailed information can also be found in the application note Setting SDI-12 addresses on
METER digital sensors using Campbell Scientific data loggers and LoggerNet.
When using the sensor as part of an SDI-12 bus, excite the sensors continuously to avoid
issues with initial sensor startup interfering with the SDI-12 communications.
SDI-12 communication can convey multiple parameters from a single function call. In the
data stream, TEROS 21 reports (1) the sensor address, (2) the water potential (in kilopascals),
and (3) the temperature (in Celsius).