Here3+ Disappears from CAN line when FDCAN is turned on

[CjF (Christopher)]

The Here3+ units disappear from the can line screen in mission planner when FDcan is turned on. This means mission planner can no longer be used to change parameters on the Here3+, so FDcan cannot be turned back off. The GPS units still function on the platform so the FDcan is working, but there seems to be a strange interaction between them and Mission planner.
Is this intended operation? Is there another way to modify the settings on a Here3+ GPS so that FDcan can someday be turned off or the firmware can be updated?

This post is a followup to another, since the issue evolved from the previous post:

Here 3+ GPS in series failing 5hz latency, becoming unhealthy

I am attempting to use two Here3+ GPS in a daisy chain series, in order to use less CAN ports on the flight controller. Both GPS units are able to connect, get unit node ID’s, and find satellites, but I receive a GPS unhealthy warning on the GPS at the end of the daisy chain. I have tried using terminating resistors, and going without them, but I still get the same issue. The GPA delta graph shows that the GPS is frequently communicating too slowly, but I am not sure why. The issue goes away w…

[sidbh (Siddharth Purohit)]

Please try dronecan gui tool, ensure that CANFD is enabled on Cube as well. Overview - DroneCAN

[CjF (Christopher)]

Can FD was enabled on the cube, but it did not help. The image included above was taken from the DroneCAN gui tool.

After working with Michael Oborne, I updated to a new beta version of Mission planner, and there was a small change that allowed me to connect to the FD enabled GPS units. I was then able to change the Here3+ GPS back to normal CAN.