I did this recently, using 2 MAX323 chips to isolate the 2 ports.  The
MAX323's went between the pic and the MAX232.  This also gave me the
advantage of being able to select which port I wanted to listen to at any
given time, and sending was isolated as well.  Remember to use pullup
resistors between the 323 chips and the pic!

--Joe Jansen


pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU> wrote on
04/22/2004 07:00:19 AM:

> Resending, was missing the tag...
>
> I have two rs232 connections and I would like to send/receive from both
of
> them, *not* at the same time.  Can I connect the two of them to the same
> RX/TX line and somehow select comm1 and comm2 from the pic?
>
> Thanks,
>
> Omer
>
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