How do I configure the USB-6501 DIO ports as push-pull?

[scottmorgan]

I am using this code in my Visual C# application to write digital outputs on the USB-6501 after adding NationalInstruments.Common and NationalInstruments.DAQmx as References:

using NationalInstruments.DAQmx;

private static void writeport(int value)
{
    try
    {
        using (Task digitalWriteTask = new Task())
        {
            digitalWriteTask.DOChannels.CreateChannel("Dev1/port2", "MyPort", ChannelLineGrouping.OneChannelForAllLines);

            DigitalSingleChannelWriter writer = new DigitalSingleChannelWriter(digitalWriteTask.Stream);
            writer.WriteSingleSamplePort(true, value);
        }
    }
    catch (Exception ex)
    {
    }
}

I want to configure the USB-6501 DIO ports as push-pull. What is the syntax for doing this and will the USB-6501 retain that configuration after power cycling it?

I found this documentation on the NI website:

https://www.ni.com/docs/en-US/bundle/ni-daqmx-c-api-ref/page/mxcprop/attr1137.html

I see that DAQmxSetDOOutputDriveType() can be used to set the drive type to DAQmx_Val_ActiveDrive but I don't know how to access this API from C#. Any suggestions?

[santo_13]

Somehow your post is exactly the same except for the difference in language - https://forums.ni.com/t5/Digital-I-O/USB-6501-Drive-Type-configuration-with-Python-nidaqmx-and-NI-MA...

There is  a property to set that in DAQmx in .NET

This documentation is available under C:\Users\Public\Documents\National Instruments\NI-DAQ\Documentation if you have installed DAQmx support for .NET

I don't think the value of this property will persist on power cycle, as a safe bet, always set this property on creating the task.

[scottmorgan · Accepted solution]

Thank you for the response. Here is the solution in practice and it works!

DOChannel ch = digitalWriteTask.DOChannels.CreateChannel("Dev1/port1", "MyPort", ChannelLineGrouping.OneChannelForAllLines);
ch.OutputDriveType = DOOutputDriveType.ActiveDrive;

We also have removed all of the weak pull-up resistors from the USB-6501 so that the outputs don't automatically powerup high when the board powers up.