Counter Input >> Two Edge Separation >> First >> Input Terminal

NI-DAQmx C Properties

Counter Input >> Two Edge Separation >> First >> Input Terminal

Data Type: char*
Description: Specifies the source terminal of the digital signal that starts each measurement.

You can get/set/reset this property using:
  DAQmxGetCITwoEdgeSepFirstTerm
  DAQmxSetCITwoEdgeSepFirstTerm
  DAQmxResetCITwoEdgeSepFirstTerm