Date: Fri, 18 Jun 1999 18:14:53 +0930 From: Greg Lehey <grog@lemis.com> To: Don Read <dread@calcasieu.com> Cc: Andrew Johns <ajohns@TurnAround.com.au>, FreeBSD Questions <freebsd-questions@FreeBSD.ORG>, cjclark@home.com Subject: Re: Null-Modem? Message-ID: <19990618181452.B2863@freebie.lemis.com> In-Reply-To: <XFMail.990618012143.dread@calcasieu.com>; from Don Read on Fri, Jun 18, 1999 at 01:21:43AM -0500 References: <000f01beb948$1a080670$4001a8c0@tasajohns.turnaround.com.au> <XFMail.990618012143.dread@calcasieu.com>
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On Friday, 18 June 1999 at 1:21:43 -0500, Don Read wrote: > > On 18-Jun-99 Andrew Johns wrote: >> A null-modem cable is a cable with the correct wires crossed/joined - >> typically if all you want is software flow control (not the best but it >> works) just connect pins 2,3 and 7 in a DB25 serial port connector (aka >> V35 connector) and swap pins 2 and 3 at one end. Pin 2 is transmit, 3 >> receive, 7 ground; so you've got: >> >> One end: Other end: >> >> TX 2 --------\/------------- 3 RX >> RX 3 --------/\------------- 2 TX >> Gr 7 ----------------------- 7 Ground >> > if your terminals pay attention to the control signals then add: > > RTS 4 -- -- 4 > | | > CTS 5 -- -- 5 > > DSR 6 -- -- 6 > | | > CD 8 -- -- 8 > | | > DTR 20 -- -- 20 Right. That's what I call a null modem. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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