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NI-DAQmx C Properties

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Data Type: bool32
Description: Specifies if an NI-DAQmx Read function automatically starts the task if you did not start the task explicitly by using DAQmxStartTask(). The default value is TRUE. When an NI-DAQmx Read function starts a finite acquisition task, it also stops the task after reading the last sample.

You can get/set/reset this property using:
  DAQmxGetReadAutoStart
  DAQmxSetReadAutoStart
  DAQmxResetReadAutoStart