Create a waveform using PCI-6723 AO with various time intervals on the trailing edge of the sample of 200 Hz clock and 0.1% duty cycle

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• 672PCI 6723 error when you try to generate a signal with the sample of 20 kHz clock

  I have a piece of code that worked successfully on the PCI-6224 map, but when I tried to implement the same code on the card PCI-6723 I ran into problems.

  Here is the code I use:

  ManchConversion6723();//produces SendIt array of series of 1s/0s
  
  // DAQmx Configure Clock
  DAQmxErrChk (DAQmxCreateTask("",&taskHandleFRQ));
  DAQmxErrChk (DAQmxCreateCOPulseChanFreq(taskHandleFRQ,"Dev3/ctr0","",DAQmx_Val_Hz,DAQmx_Val_Low,0,20000,0.5));
  DAQmxErrChk (DAQmxCfgImplicitTiming(taskHandleFRQ,DAQmx_Val_ContSamps,72));
  
  // DAQmx Configure Digital Output
  DAQmxErrChk (DAQmxCreateTask("",&taskHandle));MessageBox("D");//vj
  DAQmxErrChk (DAQmxCreateDOChan(taskHandle,"Dev3/port0/line0","",DAQmx_Val_ChanPerLine));MessageBox("E");//vj
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"/Dev3/Ctr0InternalOutput",20000,DAQmx_Val_Rising,DAQmx_Val_ContSamps,72));
  
  // DAQmx Write Code
  DAQmxErrChk (DAQmxWriteDigitalLines(taskHandle,72,0,10.0,DAQmx_Val_GroupByChannel,SendIt6723,NULL,NULL));
  
  // DAQmx Start Code
  DAQmxErrChk (DAQmxStartTask(taskHandleFRQ));
  DAQmxErrChk (DAQmxStartTask(taskHandle));
  

  When I get on the DAQmxCfgSampClkTiming line, I get an error stating:

  DAQmx error: measurements: request the value is not supported for this property value.

  PropertyAQmx_SampTimingType

  You asked: DAQmx_Val_SampClk

  You can select: DAQmx_Val_OnDemand

  Task name: _unnamedTask<0>

  State code:-200077

  I think that the problem comes from the variable of the source of the function. I'm just tring to send the data to the frequency of 20 kHz.

  Any help would be greatly appreciated. Thanks in advance!

  Too bad. The impression that the PCI-6723 does not contain correlated DIO channels. In other words, examples of clock cannot be linked to the DIO channels allowing the generation of digital waveforms. According to the AO Series user manual, this applies to the NI 6731/6733 only. The mistake was trying to tell me that only a single issue or receive channel has been authorized.

  For this reason, I'll stick right with my card PCI-6224.

  Sorry for the confusion.

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