CR200/CR200X Series Dataloggers - Campbell Scientific
CR200/CR200X Series Dataloggers - Campbell Scientific
CR200/CR200X Series Dataloggers - Campbell Scientific
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Section 11. Programming Resource Library<br />
Mv!<br />
SDIRecorder () Instruction<br />
SDICommand Entry<br />
Actions Internal to <strong>CR200</strong>(X) and<br />
Sensor<br />
<strong>CR200</strong>(X): Issues aMv! command<br />
Sensor: Responds with atttnn<br />
<strong>CR200</strong>(X): Waits until ttt 1 seconds.<br />
Issues aDv! command(s)<br />
Sensor: Responds with data.<br />
Cv!<br />
<strong>CR200</strong>(X): Issues aCv! command<br />
Sensor: Responds with atttnn<br />
<strong>CR200</strong>(X): If ttt=0 then issues aDv!<br />
command(s)<br />
Sensor: Responds with data.<br />
<strong>CR200</strong>(X): else, if ttt>0 then moves to<br />
next CRBASIC program instruction.<br />
<strong>CR200</strong>(X): At next time SDIRecorder()<br />
is executed, if elapsed time < ttt, moves<br />
to next CRBASIC instruction,.<br />
<strong>CR200</strong>(X): else, issues aDv!<br />
command(s)<br />
Sensor: Responds with data.<br />
<strong>CR200</strong>(X): Issues aCv! command (to<br />
request data for next scan).<br />
Cv (note: no ! termination)<br />
<strong>CR200</strong>(X): Tests to see if ttt expired.<br />
If ttt not expired, loads "1e9" into first<br />
variable then moves to next CRBASIC<br />
instruction. If ttt expired, issues aDv!<br />
command(s).<br />
Sensor: Responds to aDv! command(s)<br />
with data, if any. If no data, loads NAN<br />
into variable.<br />
<strong>CR200</strong>(X): moves to next CRBASIC<br />
instruction (does not re-issue aCv!<br />
command).<br />
1 Note that ttt is local only to the SDIRecorder() instruction.<br />
11.4.3 SDI-12 Power Considerations<br />
When a command is sent by the datalogger to an SDI-12 probe, all probes on<br />
the same SDI-12 port will wake up. Only the probe addressed by the datalogger<br />
118
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