Campbell CR800 Series - Page 247

Section 7. Installation
247
SDI-12 Commands for Programmed (SDIRecorder()) Mode
Command Name
SDIRecorder()
SDICommand
Argument
SDI-12 Command Sent
Sensor Response
1
CR800 Response Notes
CR800: else, if ttt > 0 then moves to next CRBasic
program instruction
CR800: at next time SDIRecorder() is executed, if
elapsed time < ttt, moves to next CRBasic instruction
CR800: else, issues aDv! command(s)
Sensor: responds with data
CR800: issues aCv! command (to request data for next
scan)
Alternate Concurrent
Measurement
Cv
(note — no !
termination)
2
CR800: tests to see if ttt expired. If ttt not expired, loads 1e9 into first variable
and then moves to next CRBasic instruction. If ttt expired, issues aDv!
command(s). See section Alternate Start Concurrent Measurement Command
(Cv) (p. 248)
Sensor: responds to aDv! command(s) with data, if any.
If no data, loads NAN into variable.
CR800: moves to next CRBasic instruction (does not re-
issue aCv! command)
Send Identification
I!
CR800: issues aI! command
Start Measurement
M!, Mv!, MCv!
CR800: issues aMv! command
Sensor: responds with atttnn
CR800: If nnn = 0 then NAN put in the first element of
the array.
CR800: waits until ttt
3
seconds (unless a service request
is received). Issues aDv! command(s). If a service
request is received, issues aDv! immediately.
Sensor: responds with data
Continuous Measurements
Rv!, RCv!
CR800: issues aRv! command
Start Verification
V!
CR800: issues aV! command
1
See table SDI-12 Commands for Transparent Mode (p. 242) for complete sensor responses.
2
Use variable replacement in program to use same instance of SDI12Recorder() as issued aCV! (see the CRBasic
example Using Alternate Concurrent Command (aC) (p. 251) ).
3
Note that ttt is local only to the SDIRecorder() instruction. If a second SDIRecorder() instruction is used, it will
have its own ttt.