Counter Output >> General Properties >> More >> Advanced >> Constrained Generation Mode

NI-DAQmx C Reference Help

Edition Date: January 2019

Part Number: 370471AM-01

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Data Type: int32
Description: Specifies constraints to apply when the counter generates pulses. Constraining the counter reduces the device resources required for counter operation. Constraining the counter can also allow additional analog or counter tasks on the device to run concurrently. For continuous counter tasks, NI-DAQmx consumes no device resources when the counter is constrained. For finite counter tasks, resource use increases with the frequency regardless of the constraint mode. However, fixed frequency constraints significantly reduce resource usage, and fixed duty cycle constraint marginally reduces it.


Valid values

DAQmx_Val_Unconstrained 14708 Counter has no restrictions on pulse generation.
DAQmx_Val_FixedHighFreq 14709 Pulse frequency must be above 7.63 Hz and cannot change while the task runs. In this mode, the duty cycle has 8 bits of resolution.
DAQmx_Val_FixedLowFreq 14710 Pulse frequency must be below 366.21 Hz and cannot change while the task runs. In this mode, the duty cycle has 16 bits of resolution.
DAQmx_Val_Fixed50PercentDutyCycle 14711 Pulse duty cycle must be 50 percent. The frequency can change while the task runs.



You can get/set/reset this property using:

  DAQmxGetCOConstrainedGenMode

  DAQmxSetCOConstrainedGenMode

  DAQmxResetCOConstrainedGenMode

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