Some of the Linear Technology RS232 transcievers let you externally
shut down the chip, I don't recall if it puts the inputs and outputs
in a high-Z state.

On Fri, 19 May 1995, Paul Greenwood wrote:

> > RS232 interfacing made easy.
> >
> > What you need:
> > --------------
> >                 1. MAX232 / MAX233
>
> Anyone know of a solution like this that allows you to tri-state the RS232
> outputs?  (The +/-12V side - NOT the TTL side.)
>
> --
>             -- Paul Greenwood --  (pablo@austin.ibm.com)
> For an idea to be fashionable is ominous, since it must afterwards be
> always old-fashioned.
>
> "His super power is to turn into a scotch terrier."
>