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 Distribution: na Organization: Tektronix Inc., Beaverton, Or. Lines: 40 Summary: Expires: Sender: Followup-To: > >>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