Take a look at the topic "PicPoint Net" at URL

     http://www.picpoint.com

for lots of ideas, schematics, software and the like (all free) !!!!
Communication is RS-485 over wire. For using mains communication, look at
SGS Thompson (http://www.st.com) for integrated circuit ST7537 (lots of app
notes) or Philips (http://www.semiconductor.philips.com) for integrated
cicuit TDA5051(A).

You could also look at the US Patent Database
(http://patent.womplex.ibm.com) for many good ideas, especially patents
numbers:

4,864,589
5,278,862
5,090,024
5,263,046
5,684,826
5,241,283

and you can do boolean searches like "power line AND modem", "intellon AND
ocala", etc. to get other useful links to patents.......

By the way, if you want someday to market your products in Europe, forget
all the information about Spread Spectrum Power Line Communications you
encounter, it's not allowed there (only taxpaying in huge quantities is 100%
allowed there, so the burocrats can live without working - let the stupids
work  ...... so bad......:(:(:(:(:(:(:(:(:( ).


Regards,

Albert A. Smulders
InSAD - Encarnacion, Paraguay
insad@itacom.com.py

-----Mensaje original-----
De: T_BoNe <ssj@primario.unorpnet.com.br>
Para: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Fecha: Jueves 9 de Julio de 1998 20:38
Asunto: PIC net


>hello folks!
>
>I'm designing a house monitor/controller and need to put the master
>controller
>in comunication with slaves displays (both pic'ed).
>The master will be a "black box" with only I/O's and one port to
communicate
>
>with the remote display(s). I'm thinking in use the mains to make
conections
>
>easier and more portable.
>Any sugestions on how to interface, schematics and what protocol will be
>highly appreciate!
>
>
>thanks!
>
>Silvio B.
>ssj@unorpnet.com.br
>ICQ:2221034