Table 43. SDI-12 Commands for Transparent Mode
Command Name
Command Syntax
1
Response
2
Notes
Break
Continuous
spacing for at least
12 milliseconds
None
Address Query
?! a<CR><LF>
Acknowledge Active
a! a<CR><LF>
Change Address
aAb!
b<CR><LF> (support for this command is required only if the sensor
supports software changeable addresses)
Start Concurrent Measurement
aC! atttnn<CR><LF>
Additional Concurrent
Measurements
aC1! ... aC9!
atttnn<CR><LF>
Additional Concurrent
Measurements and Request CRC
aCC1! ... aCC9!
atttnn<CR><LF>
Send Data aD0! ... aD9! a<values><CR><LF> or a<values><CRC><CR><LF>
Send Identification
aI!
allccccccccmmmmmmvvvxxx...xx<CR><LF>. For example,
013CampbellCS1234003STD.03.01 means address = 0, SDI-12 protocol
version number = 1.3, manufacturer is Campbell Scientific, CS1234 is the
sensor model number (fictitious in this example), 003 is the sensor version
number, STD.03.01 indicates the sensor revision number is .01.
Start Measurement
3
aM! atttn<CR><LF>
Start Measurement and Request CRC
3
aMC! atttn<CR><LF>
Additional Measurements
3
aM1! ... aM9!
atttn<CR><LF>
Additional Measurements and
Request CRC
3
aMC1! ... aMC9!
atttn<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)
Start Verification
3
aV! atttn<CR><LF>
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 SDI12Recorder() instruction by declaring the Destination variable as String.
3
This command may result in a service request.
SDI-12 Address Commands
Address and identification commands request metadata about the sensor. Connect
only a single probe when using these commands.
?!
Requests the sensor address. Response is address, a.
Syntax:
?!
269
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