Why Do I Get Error 65570 When Using a NI 987x Serial Module

Updated Oct 24, 2019

Reported In


  • NI-9870
  • NI-9871
  • CompactRIO Chassis


  • LabVIEW

Issue Details

  • I am trying to use my 9870/9871 serial module for CompactRIO, but when I run my code I get Error 65570.
  • I can write data using my NI 987X, but get error 65570 when trying to read.


This error is most commonly caused because the serial device is not powered correctly. Make sure you have connected the module to a power supply between +8 and +28 VDC (This device will use ~.5W of power typically, and has a 2 W max).
If the power supply is plugged in, make sure the voltage is within specification and there are no damaged cables or pins.