For DPM RCEs, first ssh to the DTM, then use minicom with the bay and rce number
minicom bay<0-3>.<0|2>
For example:
minicom -w bay0.2
The default username and password are both root.
For DTM RCEs, connect USB cable to COB front panel
Then use console program, such as minicom, on host linux machine.
WARNING - Do not connect to DPM RCE serial console while connected to DTM serial console.