Section 11. Programming Resource Library
113
SDI-12 commands and responses are defined by the SDI-12 Support Group
(www.sdi-12.org) and are summarized in TABLE. Standard SDI-12 Command
& Response Set (p. 113). Sensor manufacturers determine which commands to
sup
port. The most common commands are detailed below.
Table 14. Standard SDI-12 Command & Response Set
Name Command
1
Response
2
Break Continuous
spacing for at least
12 milliseconds
None
Acknowledge Active a! a<CR><LF>
Send Identification aI! allccccccccmmmmmmvvvxxx...xx<CR><LF>
Change Address aAb! b<CR><LF> (support for this command is required only
if the sensor supports software changeable addresses)
Address Query ?! a<CR><LF>
Start Measurement
3
aM! atttn<CR><LF>
Start Measurement and Request
CRC
3
aMC! atttn<CR><LF>
Send Data aD0!
.
.
.
aD9!
a<values><CR><LF> or a<values><CRC><CR><LF>
a<values><CR><LF> or a<values><CRC><CR><LF>
a<values><CR><LF> or a<values><CRC><CR><LF>
a<values><CR><LF> or a<values><CRC><CR><LF>
a<values><CR><LF> or a<values><CRC><CR><LF>
Additional Measurements
3
aM1!
.
.
.
aM9!
atttn<CR><LF>
atttn<CR><LF>
atttn<CR><LF>
atttn<CR><LF>
atttn<CR><LF>
Additional Measurements and
Request CRC
3
aMC1! ... aMC9! atttn<CR><LF>
Start Verification
3
aV! atttn<CR><LF>
Start Concurrent Measurement aC! atttnn<CR><LF>
Additional Concurrent
Measurements
aC1!
.
.
.
aC9!
atttnn<CR><LF>
atttnn<CR><LF>
atttnn<CR><LF>
atttnn<CR><LF>
atttnn<CR><LF>
Additional Concurrent
Measurements and Request CRC
aCC1! ... aCC9!
atttnn<CR><LF>
Continuous Measurements aR0! ... aR9! a<values><CR><LF> (formatted like the D commands)
Continuous Measurements and
Request CRC
aRC0! ... aRC9! a<values><CRC><CR><LF> (formatted like the D
commands)
1
If the terminator '!' is not present, the command will not be issued. The CRBASIC SDI12Recorder () instruction, however, will
still pick up data resulting from a previously issued "C!" command.
2
Complete response string can be obtained when using the SDIRecorder () instruction by declaring the Destination variable as
String.
3
This command may result in a service request.
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