Though I haven't tried it for data, X-10, and Insteon appaerently work 
fairly well for data with the RS-232 adapters. These should be on the 
same leg of the 120 VAC (Not on the other phase of the 220 VAC single 
phase), but there are bridges available to get the signals on the other 
leg. Also filters are available. Check out the FAQ's at:
> http://www.smarthome.com/_/index.aspx



alan smith wrote:
> I have a client who is wants to do a cheap..ok...inexpensive communications between two PICs that the only connection between them is a 12VAC set of wires.  They only need to transmit a few bytes now and then, and RF
> is too expensive, and may not have range.  The 12VAC also is the supply for the end device.
> 
> The solutions I see are either imposing the data on the AC much like LONworks or X10 does, or actually kill the AC and then transmit the data over the pair.
> 
> So any thoughts? This is not a one off but something they want in small production...few hundred a year so it needs to be simple, easy to build, no custom components.
> 
> Ideas?
> 
> 
>       
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