PXIe Chassis Does Not Appear in MAX with MXI-Express Fiber Cable

Updated Mar 20, 2019

Reported In


  • PCIe-8381
  • PXIe-8384
  • PXIe-8383MC
  • PXIe-8381
  • MXI-Express Fiber Optic Cable


  • PXI Platform Services

Operating System

  • Windows

Issue Details

I am setting up my PXI system using the PXIe-8384 and PXIe-8381 to daisy chain 2 chassis using a fiber-optic cable. Windows Device Manager shows the PCI to PCI bridges but one of the following may occur:
  • MAX shows the PCIe-8381, but not the chassis
  • MAX can't find the card or the chassis
  • Windows Device manager doesn't show the National Instruments SMBus Controller


As mentioned in the System Requirements section of the MXI-Express Fiber Cable Getting Started Guide, the x8 MXI-Express fiber cable requires a Constant Frequency Clock (CFC) be provided to the cable. Gen II x8 PCI Express and PXI Express remote controllers use Spread Spectrum Clocking (SSC) by default.

You must change the setting using the toggle switch on your MXI-Express Gen II x8 remote controller. 

For the PCIe-8381:

Change position 3 of SW1 to ON. The figure below shows the NI PCIe-8381 set to CFC mode by toggling position 3 of SW1 to the ON position. 

For the PXIe-8384 or PXIe-8383mc:

Change SW5 into the CFC position. The figure below shows the NI PXIe-8384 and NI PXIe-8383mc with SW5 toggled in the CFC position. 

To see the images in more detail, please refer to the MXI-Express Fiber Cable Getting Started Guide

Additional Information

If you are already using constant frequency clocking and cannot see your chassis in MAX, please refer to the MXI Compatibility and Connectivity Troubleshooting Guide for additional steps.

If you are experiencing this issue with a PCIe-8381 card with Windows 10 operating system, please refer to Windows 10 PC Will Not Boot with PCIe-8381 Card Installed


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