Two common chips are the SN75176 and the MAX485. Check out the Maxim
website (http://www.maxim-ic.com) for datasheets on the MAX485. The
reference schematics in there should be a good starting point.

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams

Si Kian Boon wrote:
> Anybody can give me a guideline for RS422 / RS485?
>
> 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.

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu