> What IC to be used? Any schematics example?
>
> I going to communicate in full duplex with two PIC 16F877 by
> hardware UART separate around 50m distance.

2-wire? 4-wire? baudrate? ground voltage differences? isolated?

there are loads of RS-485 interface chips, just take what is available
and matches your requirements.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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