John,
The current version of Paul's controller communicates to external devices via RS232 only. I believe the 1000amp version of the controller also includes CANBUS.
This display brd will communicate to either version of the controller using RS232. CANBUS hardware is an option on the display brd, but is currently not supported by my firmware. I don't have any plans to write anything but if someone does, then that opens up the option to have the display communicate to other CANBUS devices and display whatever information is being sent.
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