Aaeon PFM-C20N Manual page 41

C AN B u s M o d u l e P F M - C 2 0 N
If you want to stop the Monitor Port to monitor data bus, just let the
Terminal on focus and press ctrl+c to stop. If you did not stop
receiving data via the Monitor Port, the resource of the port will be
occupied.
Step 7: Cross check
Set can0 (Monitor Port), can1 (Transmit Port) can1 (Monitor
Port), can0 (Transmit Port) in terms of the Step 6. To make sure the
transmitting and receiving is working OK on can0 and can1.
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Chapter 3 Driver Installation