Output >> Onboard Buffer Size

NI-DAQmx C Properties

Output >> Onboard Buffer Size

Data Type: uInt32
Description: Specifies in samples per channel the size of the onboard output buffer of the device.

You can get/set/reset this property using:
  DAQmxGetBufOutputOnbrdBufSize
  DAQmxSetBufOutputOnbrdBufSize
  DAQmxResetBufOutputOnbrdBufSize