Unable to Communicate over Serial Protocol Using 3rd Party Serial to USB Converter in NI PharLap RT OS

Updated Jul 23, 2018

Reported In


  • USB-485
  • USB-232


  • NI-Serial

Issue Details

I am using an instrument or sensor which has serial port. Using 3rd party serial to USB converter, I connected instrument to USB  port of NI PXI 8840 which has PharLap Real-Time (RT) operating system. But I am not able to communicate with Instrument. Why is it so?


Drivers of Serial to USB converter from vendors other than NI, might not be supported by LabVIEW and LabVIEW RT hence you might not be able to communicate over this device. Hence, NI recommends it's customers to use NI USB-232 or NI USB-485, according to requirement which have driver as NI-Serial and fully supported by NI LabVIEW and NI LabVIEW RT.


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