I physically disconnect pins C1:3 & C1:10 (bus B) on an MD4-10. After startup, the message on the screen was for bus -C failure. All channels connected to bus C were in a failed state. I reconnected and communication was re-established. I then disconnected pins C1:4 and C1:9 (bus C). On startup, there was no error message, but no data coming in on C. I disconnected these pins directly at the module, so no chance of a wiring issue.
Originally, the devices on the two buses were configure on bus C only. They were later re-configured to be on the separate buses. All the CAN frames for these two buses are in external functions. This may be related to the timer issue I found related to the external function.
If I am missing something, please someone enlighten me.
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