Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!uunet!zephyr.ens.tek.com!wrgate!midas!copper!michaelk
From: michaelk@copper.MDP.TEK.COM (Michael D. Kersenbrock)
Newsgroups: comp.sys.ibm.pc
Subject: Re: DTK expansion-RS232-port pinout wanted (found)
Keywords: In article <1601@bucket.UUCP> leonard@bucket.UUCP (Leonard Erickson) writes:
Message-ID: <3412@copper.MDP.TEK.COM>
Date: 16 Aug 89 18:25:37 GMT
References: <3374@copper.MDP.TEK.COM> <1601@bucket.UUCP>
Reply-To: michaelk@copper.MDP.TEK.COM.UUCP (Michael D. Kersenbrock
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Organization: Tektronix Inc., Beaverton, Or.
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>
>
>They map directly to a "standard" 9-pin D-shell connector. The pinout of
>*that* was standardized by the AT (trans. I don't have it handy)
>
>But just wire them straight to a 9-pin connector and it should work. 
>-- 
>Leonard Erickson		...!tektronix!reed!percival!bucket!leonard
>CIS: [70465,203]
>"I'm all in favor of keeping dangerous weapons out of the hands of fools.
>Let's start with typewriters." -- Solomon Short


Thank you to all who answered.  Some went through quite a bit of effort
to help.  The straight-through answer (AT-style) is what I thought of
first, and it didn't work.  I suspected, there must be some other
"standard", so I asked the net before having to ohm-out the board to see
where things went.

The straight-though answer was very close.  One very important pin is
different though.  Ground is "supposed" to be on pin-5, but on this DTK
card (Hex I/O), ground is on pin-10, and pin-5 is a no-connect.  :-)

I had to make the insulation-displacement connector have 8 consecutive
wires, then shift the 9th wire over one "place".  Alternatively I could
have used a 10-conductor cable.  (I was modifying a "bought" pre-made cable
that didn't work -- it was wired "straight through").

Sigh -- the trivial simple things seem to take up more time than the
complicated things.....

-- 
Mike Kersenbrock
Tektronix Microprocessor Development Products
michaelk@copper.MDP.TEK.COM
Aloha, Oregon