Omer wrote:

> 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?
>

You can use them in the same circuit, but you have to isolate them from each
other and only enable one at a time.  You could use a MUX IC to switch
between the lines on the TTL side such as the 74LS151.


Brian.

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