DAQmxClearTask of output channel takes 20 seconds

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  Hello

  I use peripheral USB6221.

  I created two digital output, operating on a frequency of 75KHz and duty cycle of 50%. But I need a period of 1 microsecond between the two channels.

  I have craeted the two channel on the same task and guess if I use a delay of 0, the channels will be synchronized, but looking at the scope, the channels are not synchronized. Here's the code I used (I checked also all return codes of coarse and fine).

  Thank you

  Danny.

  Int32 RetCode;

  RetCode = DAQmxCreateTask ("", & m_OCtaskHandle);
  LogMessage (RetCode, "CreateTask", "");
  If (RetCode > = 0)
  {
  define the first output channel for 1 transmitter (75KHz)
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  "Transmit1 Line 1", / * name to assign to the channel * /.
  DAQmx_Val_Hz, DAQmx_Val_High,
  0.0, / * initial delay in seconds * /.
  75000.0, / * Freq * /.
  0.5 / * market factor * /);
  define the second output channel for 1 transmitter (75KHz with 1 microsecond delay)
  RetCode = DAQmxCreateCOPulseChanFreq (m_OCtaskHandle, "/ Dev1/ctr1", ")
  "Line2 Transmitt1", / * name to assign to the channel * /.
  DAQmx_Val_Hz, DAQmx_Val_High,
  0,000001, / * initial delay * /.
  75000.0, / * Freq * /.
  0.5 / * market factor * /);
   
  Describe all channels continuous task
  RetCode = DAQmxCfgImplicitTiming (m_OCtaskHandle, DAQmx_Val_ContSamps, 1000 / * I think that NA since continuous * /);

  RetCode = DAQmxStartTask (m_OCtaskHandle);

  Hello Danny,

  If you are looking for more output channels of the Digital pulse trains, you can create 1 task of counter that is used as the clock for digital multi-line data output. For this digital task, you will need to make the clock source line PFI for the output of your task of counter. Once this has been done, you will need to create the digital signal for each line of output and write to the card. The example called write dig Chan - Ext Clk will explain how to set up the digital task so that the task has an external clock (the counter). I hope this information helps you and if you have any other questions, feel free to post.

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  Thank you

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  Hi Jocker,

  The link was not attached to your message, but I guess that's it: http://digital.ni.com/public.nsf/allkb/CB86B3B174763C3E86256FFD007A2511 as there the example of vi you mention.

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  Pete

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