Fusion V2 RS485 SDM power meter support (RxEn, TxEn)

[Adminius]

Tested on fusion board v2 with SDM630MCT power meter

pin_mapping.json:

        "powermeter": {
            "rx": 16,
            "tx": 45,
	    "rxen": 15,
	    "txen": 46
        }

[Adminius]

markusdd/OpenDTUFusionDocs#10

[schlimmchen]

This change makes a lot of sense. However, please keep the changes to the lib to an absolute minium.

[schlimmchen]

I could test this, but I won't, at least not right now, as I trust that this works for you. The changes look clean and good and reasonable.

However, the new pins must be documented. Would you be willing to add the respective lines to the table and explain that one can either use the dere pin XOR the rxen/txen pins? Please open a pull-request against the docs repo if possible.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new discussion or issue for related concerns.