What kind of specialty interface? Maybe it's not something they made up, but another RS standard. RS 4something is also common for industrial stuff, because it has better noise rejection and longer cable runs.

If it is that, you might buy canned hardware to do the trick, and find writups of the software issues already solved.

In reply to Re: Kludging the serial port by John M. Dlugosz
in thread Kludging the serial port by Aighearach

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