>Design the PCB so that one line (TX to RX) has a pull up resister, the
    >other (RX to TX) having a pull down resister.

    But....perhaps I am missing something...but it seems to me that the two
    PCB's would have a conflict in that case.

When I made a similar suggestion, I was assuming a single PCB with
"identical" but interconnected processor circuits.  Your two PCBs can't
be completely identical if they're communicating via rs232-like protocols.
Something will have to set one of them as DTE and one as DCE, even if it's
just a "null modem cable."  It'd be pretty easy to put the distinguishing
element into such a cable...

BillW

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