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I don't know what a logical way is to you, but it sounds like normal Modbus.
Didn't see a problem with byte order yet? Maybe that will come, maybe maybe not

If you now go back to my example snippets, you may see how the function code and register address
are mapped into a hal pin.
Didn't include the port setup guess it is different everywhere
I would start writing with write to a harmless register, perhaps something that switches on a led, I don't know what is available.