Campbell Scientific AVW200-series Vibrating Wire Interfaces - Manual (Page 51)

AVW200-series 2-Channel Vibrating Wire Spectrum Analyzer Modules
SDIPort The SDIPort parameter is the port to which the SDI-12
sensor is connected. A numeric value is entered:
Code Description
1 Control Port 1
3 Control Port 3
5 Control Port 5
7 Control Port 7
SDIAddress The SDIAddress parameter is the address of the SDI12
sensor that will be affected by this instruction. Valid
addressses are 0 through 9, A through Z, and a through z.
Alphabetical characters should be enclosed in quotes (e.g.,
"0").
SDICommand The SDICommand parameter is used to specify the
command strings that will be sent to the sensor. The
command should be enclosed in quotes. TABLE 6-1 shows
the specific SDI-12 Command Codes and their returned
values.
TABLE 6-1. SDI-12 Command Codes
SDI12 Measurement Command Returned Values
aM!
(Measures both AVW200 Channel 1 and
Channel 2)
1) Chan1 Frequency
2) Chan1 Therm Resistance
3) Chan1 Signal Amplitude mV
RMS
4) Chan2 Frequency
5) Chan2 Therm Resistance
6) Chan2 Signal Amplitude mV
RMS
aM1!
(Measures AVW200 Channel 1; either
this command or the following command
is used for non-Campbell Scientific
dataloggers)
1) Chan1 Frequency
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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