8
SDI-12 COMMAND REFERENCE
The following commands comply with the SDI-12 standard version 1.3. The address of the
LISST-AOBS is represented by
a
.
Command Function
SDI-12
Command
Action
Address query
?!
Request address (requires that only one device is
connected to the SDI-12 bus)
Acknowledge active
a
!
Request response from sensor at address
a
Change address
a
A
x
!
Change address of sensor at address
a
to
x
Send identification
a
I!
Send ID string including SI address, SDI version,
Manufacturers ID and sensor model
Start measurement
a
M!
a
M1!
a
M2!
a
M3!
a
M4!
Sample once
Average for 30 seconds
Average for 60 seconds
Average for 120 seconds
Average for 300 seconds
Run wiper, then start
measurement
a
M5!
a
M6!
a
M7!
a
M8!
a
M9!
Run the wiper, then average for 30 seconds
Run the wiper, then average for 60 seconds
Run the wiper, then average for 120 seconds
Run the wiper, then average for 300 seconds
Run the wiper only; no sampling
Start concurrent
measurement
a
C!
a
C1!
a
C2!
a
C3!
a
C4!
Sample once
Average for 30 seconds
Average for 60 seconds
Average for 120 seconds
Average for 300 seconds
Run wiper, then start
concurrent
measurement
a
C5!
a
C6!
a
C7!
a
C8!
a
C9!
Run the wiper, then average for 30 seconds
Run the wiper, then average for 60 seconds
Run the wiper, then average for 120 seconds
Run the wiper, then average for 300 seconds
Run the wiper only; no sampling
Send data
a
D0!
Requests output data from the preceding M or C
command. The data reply contains three values:
ABS in mg/l, Turbidity in V, and AOBS in mg/l.
