>However I think I could use a smaller PIC and simply
>have the chip drive a SS relay to switch between
>destination serial ports. This is a PC to PC serial
>link.

        Keith, why use a relay?

        You will have to use a MAX-232 to shift RS-232C levels to TTL. Just input=
 the TTL signal into an AND gate, and the other pin you use as an "enable".=
 You didn't said if you only need to shift the TX/RX line, or all the=
 control lines (DSR, DTR, etc.). If you only need TX or TX/RX, you can use=
 only one MAX-232 to drive the input and output of your circuit. As simple=
 as it can gets ;o)


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Alexandre Souza
taito@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

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