Xylem SDI-12 RADAR - Manual (Page 24)

SDi-12 CommaND & reSPoNSe
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Upon completion of the measurement, a service request “a” is sent to the data recorder
indicating the sensor data is ready. The data recorder may wake the sensor with a break and collect
the data any time after the service request is received or the specified processing time has elapsed.
example of an "am1!" command when Power mode = 0:
Command response Time Values Description
"am1!" "a1844" 184 sec 4 make measurement
Note: The service request is normally sent within 182 seconds of receipt of the command. The
184-second value reported allows time for a few retries when communicating with the radar
subsystem.
Subsequent Command response
"aD0" a+aa.aaa+BB.BBB+CC+DD.D
where:
aa.aaa = Stage (feet, inches, meters etc.)
BB.BBB = Standard Deviation (feet, inches, meters etc.)
CC = Number of outlier data points discarded
DD.D = Power Supply Voltage (Volts)
example of an “am1!” command when Power mode = 1:
Command response Time Values Description
"am1!" “a0014” 1 sec 4 make measurement.
Subsequent Command response
"aD0" a+aa.aaa+BB.BBB+CC+DD.D
where:
aa.aaa = Stage (feet, inches, meters etc.)
BB.BBB = Standard Deviation (feet, inches, meters etc.)
CC = Number of outlier data points discarded
DD.D = Power Supply Voltage (Volts)