Appendix D.  The Public Table 
 
Values and Control Parameters for SDI-12 Communications 
SDI12val(1)  Frequency value obtained by SDI Recorder Instruction, if 
used; unchanged if not using SDI-12. 
SDI12val(2)  Amplitude value obtained by SDI Recorder Instruction, if 
used; unchanged if not using SDI-12. 
SDI12val(3)  Signal to noise ratio obtained by SDI Recorder Instruction, if 
used; unchanged if not using SDI-12. 
SDI12val(4)  Signal to noise frequency obtained by SDI Recorder 
Instruction, if used; unchanged if not using SDI-12. 
SDI12val(5)  Decay ratio obtained by SDI Recorder Instruction, if used; 
unchanged if not using SDI-12. 
SDI12val(6)  Thermistor reading obtained by SDI Recorder Instruction, if 
used; unchanged if not using SDI-12. 
SDIChan  Channel used for SDI-12 measurement 
SDIBFreq  Begin frequency used for SDI-12 measurement 
SDIEFreq  End frequency used for SDI-12 measurement 
SDIExVolt  Excitation voltage used for SDI-12 measurement 
Value of Last Instruction That’s Running 
Ch1Freq  Frequency value measured on channel 1 
Ch1Amp  Amplitude value measured on channel 1 
Ch1SNR  Signal to noise ratio measured on channel 1 
Ch1SNRFreq  Signal to noise frequency measured on channel 1 
Ch1Decay  Decay ratio measured on channel 1 
Ch1Therm  Thermistor reading measured on channel 1 
Ch2Freq  Frequency value measured on channel 2 
Ch2Amp  Amplitude value measured on channel 2 
Ch2SNR  Signal to noise ratio measured on channel 2 
Ch2SNRFreq  Signal to noise frequency measured on channel 2 
Ch2Decay  Decay ratio measured on channel 2 
Ch2Therm  Thermistor reading measured on channel 2 
D-2