Configuring the NI USB-6009/6501 for Open-Drain or Push-Pull Digital Operation with NI-DAQmx Base

Hardware: Multifunction DAQ (MIO)>>Portable>>USB-6009, Multifunction DAQ (MIO)>>Portable>>USB-6501

Problem:
I have an NI USB-6009/6501, and I read in the manual that you can configure the DIO lines to be Open-Drain (+5V operation) or Push-Pull (+3.3V operation). How do I do this in DAQmx Base?

Solution:
You can set this property in the NI-DAQmx Base Configuration Utility. There is no way to programatically set the output drive setting in NI-DAQmx Base. This utility can be found in the NI-DAQmx Base folder (typically Hard Drive->Applications->National Instruments->NI-DAQmx Base on a Mac, or /usr/local/natinst/nidaqmxbase/bin on Linux). Complete the following steps to change the output drive setting:

Select "Create New Task"
Choose "Digital I/O" as the acquisition task type and give the task a name
After the task is created, select the Voltage Tab.
In the Voltage Tab, there is a DIO Voltage Level option. For Open-Drain, use the 0-5V option. For Push-Pull, use the 0-3.3V option.

*Note: This picture shows where this selection can be made in the NI-DAQmx Base Configuration Utility.

If you are using a Windows machine, then you can use the NI-DAQmx driver. This will allow you to either configure the output drive setting in Measurement & Automation Explorer, or programatically by setting the properties with the NI-DAQmx driver. Please see the KB linked below for a description of setting the output drive in NI-DAQmx.

- Open-DrainConfig.gif

Report Date: 04/11/2005
Last Updated: 05/23/2007
Document ID: 3KAFMFBH

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