They already have modules already known at TM523 modules.  Connect these to
your PIC and the rest is easy.
A simple websearch will bring up lots of info on these modules and even
include examples with PICs.

Coupling/Decoupling to the AC line is the easiest part.




> OK, for the second part of this project idea, I would like to transmit
> simple codes over the 48VAC lines similar to X10 type I
> suppose.  Just an
> address and data, and not bidirectional.
>
> Codes and such to put out serially isn't an issue, the coupling and
> decoupling to the AC is the trickier part.  I'd assume some
> sort of smallish
> 1:1 transformer and then what?
>
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