USB DAQ Device Loses Communication with LabVIEW, MAX, or Other NI Software

Updated Apr 10, 2018

Reported In

Hardware

  • USB Cable
  • cDAQ-9171
  • cDAQ-9174
  • cDAQ-9178
  • cDAQ-9179

Issue Details

  • My USB DAQ device intermittently loses communication with my machine.
  • I receive an error when creating a DAQmx task saying the USB DAQ device is not present.

Solution

Follow the suggestions below to resolve the communication issues: 
  • Move the cable and USB cDAQ device away from electromagnetic interference (EMI) sources
  • Use a USB cable with EMI shielding 
    • Options range from shielded plastic cables, which resist EMI, to IP67-rated metalized plastic cables, which resist EMI and provide potential physical damage from harsh environments
  • Shield the USB DAQ device with a metal case 
    • You can find the electromagnetic certifications and standards for NI devices by searching for device's Product Certification page. 

Additional Information

USB DAQ device communication issues most commonly occur when there is a rapid changing of current at high voltages near the device or cable. This rapid change causes an inductive kick in the voltage source, which causes EMI. 

Standard USB cabling is not intended for use around magnetic fields and are susceptible to EMI. 

 

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