How to change output drive mode to open drain for ni-DAQmx

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Oscar Bi
Oscar Bi 2017-1-27
回答： Sruthi Geetha 2017-1-30
I am trying to change the digital output drive mode on my NI 6003 Daq to open-drain mode. How do I do that with the data acquisition tool box and the NI Daq-mx adapter. I don't see a function or a property for it in the digital output channel I created.

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Sruthi Geetha
Sruthi Geetha 2017-1-30
The session interface in Data Acquisition Toolbox does not have direct support for changing the drive type of a digital output channel (when supported by the device).
However, it would be possible to implement a workaround calling low-level NI-DAQmx vendor driver functions for accessing this functionality via the undocumented MEX "projection layer" available in Data Acquisition Toolbox.
The NI-DAQmx driver offers the following functions for changing the output drive type property of a certain channel: DAQmxGetDOOutputDriveType DAQmxSetDOOutputDriveType DAQmxResetDOOutputDriveType
These functions are made available to be called directly from MATLAB using a MEX "projection layer" daq.ni.NIDAQmx.DAQmxGetDOOutputDriveType daq.ni.NIDAQmx.DAQmxSetDOOutputDriveType daq.ni.NIDAQmx.DAQmxResetDOOutputDriveType
Refer to the attached example code and wrapper functions, as a usage example for calling these functions and changing the Output Drive Type for a digital output channel: test_DO_DriveType.m NI_DAQmxSetDOOutputDriveType.m NI_DAQmxGetDOOutputDriveType.m

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