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2. Quick Start
The SDI-12 AnalogPlus module arrives ready to use for many voltage measuring applications.
The module has four pluggable terminal blocks with three connections each. One block contains the SDI-12
connection to the SDI-12 Data Recorder (+12V power, Ground, and Data). The other three provide
connections for the sensors.
Left Side Top
Right Side Top
Label
Description
Label
Description
SW‟D
Switched Voltage out (+5 or +12)
Vref
Reference Voltage out (2.5V)
D IN
Digital input
GND
Ground
AN4
Analog input 4 / optional digital in
AN1
Analog input 1
Left Side Bottom (SDI-12 connection)
Right Side Bottom
Label
Description
Label
Description
+12
+12V SDI power from recorder
AN2
Analog input 2
GND
Ground connection to recorder
GND
Ground
DATA
SDI-12 data line to recorder
AN3
Analog input 3
The unit comes configured from the factory at SDI-12 address 0 and ready to make analog readings. Just
issue the basic SDI-12 start measurement command “M” to address 0 ( 0M! ) and the unit will initiate a
reading of all four analog inputs. Get the data back with a “D0” command ( 0D0! ) (done automatically by
most data recorders when they are measuring) and the unit will return the four voltage readings (AN1, AN2,
AN3, AN4).
If using with other SDI-12 sensors, then the unit will need to be set to a unique address. This is done with the
change address command ( aAb! ) where “a” is current address and “b” is the new address. The unit needs to
be only SDI-12 module on the bus at address “a” when this command is issued, or you will end up changing
both units to address “b”. For example, to change the address from the factory default of “0” to “2”, issue the
command:
0A2!
All future commands will then need to be sent to address 2.
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 AnalogPlus module will look
similar to the following:
013 SUTRON 1248-11.0 A1.2
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 1248-1.
Right Bottom
Right Top
Left Bottom
Left Top
