NI DAQ Digital Lines Output High Value While Powering ON or Shutting Down

Updated Aug 6, 2018

Reported In

Software

  • Measurement & Automation Explorer (MAX)

Driver

  • NI-DAQmx

Issue Details

I am using a  NI X-series DAQ hardware, why do I get high output in the DIO lines during the computer powering up state or after computer is shut down. Can this be changed?

Solution

The output of the DIO lines of the NI X series DAQ while powering up or after shutting down will be dependent on the Power Up State setting of the hardware. This value can be configured in the NI MAX. Refer to the knowledge-base How to Set the Digital Output Line Power Up State for more details.

Additional Information


Pull-down / Pull-up Resistor: Some NI devices are capable of programmatically configuring their digital or PFI lines as input, output, or high impedance. Pull resistors are used to ensure that any pin that would otherwise be floating is referenced to a known signal, such as ground or a voltage source. A pull-down resistor will pull a floating signal to a ground state or logic low, and a pull-up resistor pulls a floating signal to the logic high voltage value.

Example: The PXIe-6361 uses a pull-down resistor of 50 kΩ that ensures terminals not being actively driven high or low will float to a low state.

 

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