Counter Input >> Semi-Period >> Input Terminal

NI-DAQmx C Properties

Counter Input >> Semi-Period >> Input Terminal

Data Type: char*
Description: Specifies the input terminal of the signal to measure.

You can get/set/reset this property using:
  DAQmxGetCISemiPeriodTerm
  DAQmxSetCISemiPeriodTerm
  DAQmxResetCISemiPeriodTerm