From owner-freebsd-alpha Wed Jan 16 12:49:43 2002 Delivered-To: freebsd-alpha@freebsd.org Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by hub.freebsd.org (Postfix) with ESMTP id 79CEC37B417 for ; Wed, 16 Jan 2002 12:49:36 -0800 (PST) Received: (from uucp@localhost) by srv1.cosmo-project.de (8.11.6/8.11.6) with UUCP id g0GKnCM35422; Wed, 16 Jan 2002 21:49:12 +0100 (CET) (envelope-from ticso@cicely8.cicely.de) Received: from mail.cicely.de (cicely20.cicely.de [10.1.1.22]) by cicely5.cicely.de (8.12.1/8.12.1) with ESMTP id g0GKnYZ9036793; Wed, 16 Jan 2002 21:49:34 +0100 (CET)?g (envelope-from ticso@cicely8.cicely.de) Received: from cicely8.cicely.de (cicely8.cicely.de [10.1.2.10]) by mail.cicely.de (8.11.0/8.11.0) with ESMTP id g0GKnXW06493; Wed, 16 Jan 2002 21:49:33 +0100 (CET) Received: (from ticso@localhost) by cicely8.cicely.de (8.11.6/8.11.6) id g0GKnWG53185; Wed, 16 Jan 2002 21:49:32 +0100 (CET) (envelope-from ticso) Date: Wed, 16 Jan 2002 21:49:32 +0100 From: Bernd Walter To: Terry Lambert Cc: Trevor Johnson , Riccardo.Veraldi@fi.infn.it, freebsd-alpha@FreeBSD.ORG Subject: Re: DEC3000/300 Message-ID: <20020116214931.M50371@cicely8.cicely.de> References: <20020116023458.E17814-100000@blues.jpj.net> <3C45DF84.5990A4E4@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3C45DF84.5990A4E4@mindspring.com> User-Agent: Mutt/1.3.23i X-Operating-System: FreeBSD cicely8.cicely.de 5.0-CURRENT i386 Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Wed, Jan 16, 2002 at 12:16:04PM -0800, Terry Lambert wrote: > Trevor Johnson wrote: > > > I just got a DEC3000/300 > > > to use the seial console do I have to get a NULL modem or modem serial > > > cable? > > > > I made a quick-and-dirty null modem cable to attach to a PC: > > > > DB25F DB9F > > (DEC 3000) (PC) > > 2 ----------- 2 > > 3 ----------- 3 > > 6 ----------- 6, 8 > > 7 ----------- 5 > > This isn't a NULL-modem cable (2&3 aren't swapped), it's just > "a cable with pin 8 hooked to pin 6 on one side for some reason". You overlooked that one side is DB-9 and the other DB-25. But the bridging of 6 and 8 (CTS and DSR) is questionable. > A real NULL-modem cable looks like: > > TX -------- RX > RX -------- TX > CTS -------- RTS > RTS -------- CTS > GND -------- GND (signal ground, not chassis ground) > DCD -------- DTR > DTR -------- DCD > GND -------- (chassis ground on one end to all other wires) I usually additionaly bridge DSR with DCD on both sides just in case I need to use it for designs requiring DSR. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message