Digital Output >> Output Drive Type

Data Type:	int32
Description:	Specifies the drive type for digital output channels.

Valid values

DAQmx_Val_ActiveDrive	12573	Drive the output pin to approximately 0 V for logic low and +3.3 V or +5 V, depending on the device, for logic high.
DAQmx_Val_OpenCollector	12574	Drive the output pin to 0 V for logic low. For logic high, the output driver assumes a high-impedance state and does not drive a voltage.