Campbell Scientific AVW200-series Vibrating Wire Interfaces - Manual (Page 58)

AVW200-series 2-Channel Vibrating Wire Spectrum Analyzer Modules
TABLE 7-4 shows the wiring used for both Sequential Mode examples.
TABLE 7-4. Wiring for Sequential Mode Examples
Datalogger Port for
Cable Attachment
Cable Needed to
connect to AVW200
AVW200 Port or
Model
COM1 (control port
pairs C1/C2)
17855 Cable (pigtail to
DB9 male cable)
RS-232
7.4.1 AVW200 Controlling Two Multiplexers in Sequential Mode
' Example Program running in the Sequential mode with AVW200 controlling
' 2 muxes. The clock and reset lines of both muxes are connected to the clk
' and rst lines of the AVW200.
SequentialMode
Public PTemp, batt_volt
Public Result1, Result2, AVWDst(32,6)
Const Chan1 = 1 ' AVW200 channel 1
Const Chan2 = 2 ' AVW200 channel 2
Const MuxChan = 1 ' Starting Mux Channel
Const Reps = 16 ' Number of Reps
Const BFreq = 450 ' Begin Frequency
Const EFreq = 6000 ' End Frequency
Const Xvolt = 2 ' 12p-p Volt Excite
BeginProg
SerialOpen (Com1,38400,0,0,10000)
Scan (64,Sec,0,0) ' (2 * 32 measurement) = 64 seconds
PanelTemp(PTemp,250)
Battery (Batt_volt)
AVW200(Result1,Com1,200,200,AVWDst(1,1),Chan1,MuxChan,Reps,Bfreq,Efreq,Xvolt,_60Hz,1,0)
AVW200(Result2, Com1,200,200,AVWDst(17,1),Chan2,MuxChan,Reps,Bfreq,Efreq,Xvolt,_60Hz,1,0)
NextScan
EndProg
7.4.2 Datalogger Controlling Two Multiplexers in Sequential Mode
This example program has the datalogger controlling the multiplexers. Note
that the AVW200( ) parameter for reps is one, and x is a index variable in
AVWDst(x,1).
' Example Program running in the Sequential mode with the Datalogger
' controlling the muxes. For this program, the reset line of both muxes is
' connected to datalogger C3. Mux1 clock line is connected to DL C4 and Mux2
' clock line is connected to DL C5.
SequentialMode
Public PTemp, batt_volt, x
Public Result1, Result2, AVWDst(32,6)
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