Jason, the relay seems to be the best option. To solve the problem o Power
consumption you could use latching relays, they only require power while
changing state.

Cheers,
Isaac

Em qua, 13 de mar de 2019 12:59, Jason White <
whitewaterssoftwareinfo@gmail.com> escreveu:

> Hello everyone,
>
> My work has a product that has four pins for RS232, RS485, or RS422.
> Previously the product was built as either RS232 or RS485/RS422 - only
> containing a transceiver for one or the other but not both. But now we
> want to make a product that can be electronically configured as one or
> the other. The problem is that the same pins are used for each
> interface!
>
> I was wondering if anybody has any suggestions for a circuit that
> would permit the either of the transceivers (232 and 422) to be
> disconnected from the circuit - so that only one was physically
> connected to the pins at a time. Off the top of my head I can think of
> two solutions:
>
> (1) Signal relays on the input/output of each transceiver. This would
> permit the 232/422/485 to be on the same pins.
> Pros: Robust
> Cons: bulky, power hungry, and expensive.
>
> (2) Electronic switch, would a CD4066B work? An electronic switch is
> desirable but many don't handle the voltages required. For instance
> the MAX232 tolerates +/-30V whereas the seemingly obsolete CD4066B
> only handles 0-15V, requiring protection.
> Pros: Smaller
> Cons: Not sure how to implement, inadequate voltage tolerance
>
> --
> Jason White
> --
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