This poor man's approach ...
I do quite a bit of work with serially controlled equipment
and by far the best tool I have in my bag-o-tricks is a
simple box with red/green LEDs and a pair of DB25
connectors. That, a null modem adapter, four DB25-to-DB9
connectors (different permutations of 9 vs. 25 and male vs.
female) and a cable and I can connect just about anything
I've run into. Get the physical connection made with a
DB25 junction somewhere in the link. Disconnect that
junction and connect the LED box (winkey-blinkey to one of
my interns :) ) to each side of the gap only one side at a
time. If the same light TX or RX light up both times, you
need to add the null modem. Now plug it all together with
the LED box inline and see that the flow control lines make
sense. If they don't, only then do you need the MUCH more
expensive breakout boxes.
My $0.02
-- Paul
BTW: Anybody working on a protocol analyzer on a Palm?
___________________________________________________________
Paul A. Dugas, Computer Engineer Dugas Enterprises, LLC
mailto:[EMAIL PROTECTED] 1711 Indian Ridge Drive
tel:404-932-1355 Woodstock, GA 30189-6856
fax:770-516-4841 http://pauld.dugas.com/
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