Accubar SDI-12 Barometric Pressure Sensor Operations & Maintenance Manual Rev-B 30 Nov 2017
pg. 6
To query a module as to its address, ensure that it is the only SDI-12 module on the bus and then issue the
address query command:
?!
The unit will respond with its address.
To confirm the SDI-12 communication with a module, the SDI-12 send identification command can be issued (to
address 0 in the example):
0I!
The unit will respond with its identification string. The string from the SDI-12 barometer will look similar to the
following:
013 SUTRON BARO-12.120120002B1.01
which shows a response from address 0, that the unit supports SDI-12 specification 1.3 (and therefore 1.2, 1.1,
and 1.0), that the manufacturer is SUTRON, and that the model is a BARO-1.
3
Cabling
3.1 Sutron-Supplied Cable
The ACCUBAR
®
comes with a cable pre-wired to an internal terminal strip. The wiring of the cable is as
follows.
Name
Color
Description
SDI-12 DATA
White
Connect to data recorder SDI-12 Data line
POWER
Red
8 to 16V
GND
Black
Connect to Ground
B-OUT
Brown
RS-232 data out
A-IN
Green
RS-232 data in
Only the first three wires are needed to use the ACCUBAR
®
SDI-12 interface. The last can be used as part
of an RS-232 interface to upgrade the firmware in the unit and are not needed for an SDI-12 connection.
