Date: Mon, 29 Jul 1996 19:39:13 +0300 (EET DST) From: Andrew Stesin <stesin@gu.kiev.ua> To: Lars_Koeller@odie.physik2.uni-rostock.de (Lars Koeller) Cc: hardware@freebsd.org Subject: Re: Problems connection a terminal!! Message-ID: <199607291639.TAA17631@creator.gu.kiev.ua> In-Reply-To: <199607291551.RAA07802@odie.physik2.uni-rostock.de> from "Lars Koeller" at Jul 29, 96 05:51:12 pm
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Hello, | > I've seen such a caveat. Terminal we used to play with had a DCE-style (!) | > DB25 connector, just like a modem; but it was wired as plain DTE, | > so none of our ready-to-use null-modem cables worked, and | > a "normal" straight DTE-DCE cable didn't work either. | > | > So we were forced to solder a "crazy" nullmodem ourselves. | | Yes, that could be the solution, can you send me the wire scheme for | such a 'crazy cable' please? Just a plain vanilla "full null modem" cable, you should probably find a scheme in any RTFM. TD/RD and RTS/CTS are crossed, GND is straight (of course :). (Sorry, my right arm is still broken, so it's difficult for me to perform ASCII art exercises just now). BUT you need a null-modem with one male and one female connector (usually null-modem cables have 2 female connectors, because DTE be it a PC or a terminal or whatever _usually_ is male connector). The easiest way to do this is to get a cheap miniature device from Patton Electronics, look at http://www.patton.com which allows you to create just any RS232 wiring scheme with a mini plugs and nit also has LEDs to monitor what's going on. I think you might find a null-modem wiring schema on their site, too -- their printed catalog have some. And I've seen this kind of mini devices from other vendors, too. OR you may take a plain modem cable, cut it in the middle and cross-solder appropriate signal wires (that's what we did). Hope this helps. (BTW -- our terminal was an Esprit one). -- nic-hdl: ST73-RIPE
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