Campbell Scientific AVW200-series Vibrating Wire Interfaces - Manual (Page 79)

Appendix D. The Public Table
The public table of the AVW200 displays the current sensor measurement
values as well as the current settings (see TABLE D-1).
When the DeviceConfig runs the troubleshooter, it forces a measurement by
writing to the Timeseries() array in the Public table. When the
Timeseries(1)..Timeseries(4) elements are written with the proper values a
measurement is performed and the files Timeseries.bin and Spectrum.bin are
created or over-written if previous measurements have been forced. These file
are then used by DeviceConfig to graph the time domain and frequency domain
graphs in the troubleshooter.
A Datalogger program can also force a measurement by using the
GetVariable() and/or SetVariable() instructions (see Program Example D.1).
To do this, use the CRBasic SetVariable() instruction to set the TimeSeries(2),
TimeSeries(3) and TimeSeries(4) variables. Once these variables have the
correct values for Begin, End Frequency and Excite voltage, the measurement
can be forced by writing the TimeSeries(1) with the AVW200 channel and
Mux Channel (ie 101 = AVW200 Chan1 and MuxChan1, 205 = AVW200
Chan1 and MuxChan5, or 208 = AVW200 Chan2 and MuxChan8). The
measurement is completed when the TimeSeries(1) value is zeroed by the
AVW200. Once zeroed the TimeSeries(5) through TimeSeries(11) values can
be read using the CRBasic GetVariable() instruction.
TimeSeries(5) through TimeSeries(11) were added to OS version
STD.02. Customers with OS version STD.01 can get these public
variables by downloading a new OS (refer to Section 5.4, Send
OS).
TABLE D-1. Description of the Public Table
Record No Current record number for this set of data
Time
Stamp
Time the record was recorded
Control Parameters for AVW200 Instruction Communications
Result Result of the last measurement
NumReps Number of replications specified for this channel
Chan Channel this record was recorded from
MuxChan Multiplexer channel this data was recorded from
BeginFreq The begin frequency used for this measurement
EndFreq The end frequency used for this measurement
ExciteVolts The excitation voltage used for this measurement
Do_Therm Do the thermistor measurement or not
RScnt
Count down to start of measurement for the RS-232
communication port. -1 if no interval or not used
RFcnt Count down to start of measurement for the RF
communication port. -1 if no interval or not used
NOTE
D-1