NI XNET help file documents the pinout - https://www.ni.com/docs/en-US/bundle/ni-xnet-20.5/page/nixnet/flexraypinout.html
The following table describes the CAN DB-9 pinout on PCI and PXI FlexRay interfaces, such as PCI-8517 and PXI-8517.
|2||FlexRay A BM||FlexRay channel A bus minus|
|3||COM||FlexRay reference ground|
|4||FlexRay B BM||FlexRay channel B bus minus|
|6||(COM)||Optional FlexRay reference ground|
|7||FlexRay A BP||FlexRay channel A bus plus|
|8||FlexRay B BP||FlexRay channel B bus plus|
|9||(Ext_VBat)||Optional external bus voltage|
Thank you very much for your reply！I have another question：Does it means that each port provides two channels of FlexRay bus? When connecting a terminal, use pin2 and Pin7 or pin4 and pin8 all can meet the communication requirements?Thanks!