Campbell Scientific AVW200-series Vibrating Wire Interfaces - Manual (Page 60)

AVW200-series 2-Channel Vibrating Wire Spectrum Analyzer Modules
very next measurement will use the bbbb,eeee and vvvv values specified in the
extended command. The second and remaining measurements will revert back
to the settings specified via DevConfig.
An example of an extended command is: 0XVW450,5000,1! This command
will configure the next measurement with Begin Freq=450, End Freq = 5000
and 5Volt excitation. Following the extended command the “aM1!” command
will use the parameters set by the extended command.
TABLE 7-5 shows the specific SDI-12 Command Codes and their returned
values.
TABLE 7-5. SDI-12 Command Codes
SDI12 Measurement Command Returned Values
aM!
(Measures both AVW200 Chan1 &
Chan2)
1) Chan1 Frequency
2) Chan1 Therm Resistance
3) Chan1 Signal Amplitude mV
RMS
4) Chan2 Freq
5) Chan2 Therm Resistance
6) Chan2 Signal Amplitude mV
RMS
aM1!
(Measures AVW200 Chan1)
1) Chan1 Freq
2) Chan1 Signal Amplitude mV
RMS
3) Chan1 Signal-to-Noise Ratio
4) Chan1 Noise Frequency
5) Chan1 Decay Ratio
6) Chan1 Therm Resistance
aM2!
(Measures AVW200 Chan2)
1) Chan2 Frequency
2) Chan2 Signal Amplitude mV
RMS
3) Chan2 Signal-to-Noise Ratio
4) Chan2 Noise Frequency
5) Chan2 Decay Ratio
6) Chan2 Therm Resistance
aV! 1) Battery Voltage
2) Trapcodes
3) WatchDog Counts
aXVWbbbb,eeee,v!
where:
bbbb = Begin Freq (100 < bbbb <
6.5K)
eeee = End Freq (100 < eeee < 6.5K)
v = Excite Voltage (1= 5v and 2 =
12v)
Returns "OK" if accepted
Returns "ERROR" if not accepted
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