PCI-8512 CAN FD cannot up to 2M baud rate,which make me confused

[JHON_MIT]

Hi guys,

The description below is from NI offical webside(https://www.ni.com/docs/en-US/bundle/pci-8512-specs/page/specs.html). And the snapshot is the left top corner of my card. The session is opened with CANFD_BRS+ISO CANFD, 500k+2M baud rate, 120Ω termination resistors enabled.  Why it can not up to 2M baud rate?

¹ PCI-8512 revision G and later use the TJA1043 transceiver; previous hardware revisions use the TJA1041 transceiver. To identify your hardware revision, refer to the 19xxxx<rev>-4xL text on the green label in the top left corner on the secondary side of the board; <rev> indicates the hardware revision.

² The TJA1043 transceiver is CiA certified for baud rates up to 5 Mbps in the CAN FD fast phase, while speeds up to 8 Mbps are possible experimentally. NI-XNET provides a warning when a transceiver is used at higher baud rates than it is certified for. As new CiA-certified transceivers with higher baud rates are released, NI will continue to update the hardware with newer revisions.

[ZYOng]

This question is best to be posted on Automotive and Embedded Networks board.

What do you mean by "cannot up to 2M baud rate"?

Did your program return any error when trying to use the 500k + 2M baud rate? Did you capture an unexpected waveform from the oscilloscope? Or the communication fail? Have you ruled out the termination and sample point?

See NI-XNET Troubleshooting Guide and Incorrect/Unexpected Behaviour or Slow CAN Frames When Using NI-XNET in CAN FD & BRS