With the help of SCAN_Op in Python with types

I am trying to acquire 2 channels of analog data using SCAN_Op in Python. I call SCAN_Op directly after use types to convert parameters to functions. I get only the data from a channel. I'm looking for examples or help.

nor = windll.nidaq32
c_intVector = numChans * c_int
sampleChans = c_intVector()
sampleGains = c_intVector()
I'm in range (numChans):
sampleChans [i] = [i] chans
sampleGains [i] = gains [i]

cottages. DAQ_OpStatus = neither. SCAN_Op (sampleDeviceNumber, sampleNumChans, sampleChans, sampleGains, sampleBuffer, sampleNum, sampleRate, sampleScanRate)

Theller, you are right. The following code works:

def SCAN_VOp (self, deviceNumber = 1, numChans = 2, chans = (0, 1), gains = (-1, -1), num = 2, rate = 1000.0, scanRate = 0.0, numMuxBrds = 0):
#print "incoming DAQ_VOp.
sampleDeviceNumber = c_int16 (deviceNumber)
sampleNumChans = c_int16 (numChans)
c_int16Vector = numChans * c_int16
sampleChans = c_int16Vector()
sampleGains = c_int16Vector()
I'm in range (numChans):
sampleChans [i] = [i] chans
sampleGains [i] = gains [i]
sampleBuffer = create_string_buffer(2*num)
sampleNum = c_ulong (num)
sample rate = c_double (spleen)
sampleScanRate = c_double (scanRate)
sampleNumMuxBrds = c_int16 (numMuxBrds)
#When DAQ_Op returns with a zero error number, buffer contains the acquired data.
cottages. DAQ_OpStatus = neither. SCAN_Op (sampleDeviceNumber, sampleNumChans, sampleChans, sampleGains, sampleBuffer, sampleNum, sampleRate, sampleScanRate)
cottages. DAQ_OpStatus = neither. SCAN_Demux (sampleNum, sampleNumChans, sampleBuffer, sampleNumMuxBrds)

#convert buffer table to scale
BR = sampleBuffer.raw
FMT = 'h' * num
unpacked = unpack (fmt, br)
unpackedarray = array (unpacked)
ScaledArray = unpackedarray * ((self.max-self.min) /(2 ** self.bits))
#print 'DAQ_VOp leaving.
Return to the self. DAQ_OpStatus, ScaledArray

Tags: NI Hardware

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