How Can I Change the Digital I/O Logic Levels on a NI 6535/6536/6537?

Primary Software: LabVIEW Development Systems>>LabVIEW Professional Development System
Primary Software Version: 8.6.1
Primary Software Fixed Version: N/A
Secondary Software: Driver Software>>NI-DAQmx
Hardware: Digital I/O (DIO)>>High-Speed>>PXIe-6536, Digital I/O (DIO)>>High-Speed>>PXIe-6537

Problem:
I am trying to send and read data from my DUT which operates at 3.3 V. I would like to change the logic level for my NI 6535/36/37 such that a logic high is set to 3.3 V. How can I change the logic family for my digital I/O task in DAQmx?

Solution:
Most DAQmx digital I/O boards are made to use with 5 V TTL logic levels. However, some hardware have the capability for a user to change the logic levels to user-defined values such as the NI 6535/36/37 family. In order to do this in LabVIEW you can use a DAQmx Channel property node and use the property Digital Input » Logic Family or Digital Output » Logic Family as shown in Figure 1.

Figure 1: DAQmx Channel Property Node DI.LogicFamily

Not all DAQmx devices allow users to change the logic levels of the digital channels. The property will not be visible if a device which supports this functionality is not present in your system.

Figure 2: Logic Family property does not appear if supported device is not present in system

If a device which supports a user-configurable Logic Family selection is present in the system, the property will be visible. However, if a DAQmx Channel which includes a device that does not support this feature is wired to this property, error -200452 will occur.

Figure 3: Specified property is not supported

Refer to the device documentation to ensure that your device supports this functionality.

Related Links:
Product Manual: NI 6535/6536/6537

Attachments:

Report Date: 04/01/2009
Last Updated: 12/28/2009
Document ID: 4W0FNJJQ

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