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SN75176BDR
or variants work very well.
in half duplex (RS485) you only need one at each end
or full duple (RS422) you need two on each end.
Cost is low ($0.20 each@1K)
tradeoff is price/power

Really nice part for long distance.

Ray


On Sat, 28 Apr 2007 16:53:50 -0700 (PDT), Orhan Gazi wrote:
>=A0Hello all,
>
>=A0I want to serially communicate two pic16f628s, but the distance
>=A0between them is =A0long, i.e, more than 30 meter, do you know any
>=A0integrated cicuit for obtaining greater voltages-currents from
>=A0pic16f628 output pins (i.e., amplify) =A0and at the receiver side
>=A0convert it to the pic16f628 input level.
>




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