Date: Wed, 16 Jan 2002 21:49:32 +0100 From: Bernd Walter <ticso@cicely8.cicely.de> To: Terry Lambert <tlambert2@mindspring.com> Cc: Trevor Johnson <trevor@jpj.net>, Riccardo.Veraldi@fi.infn.it, freebsd-alpha@FreeBSD.ORG Subject: Re: DEC3000/300 Message-ID: <20020116214931.M50371@cicely8.cicely.de> In-Reply-To: <3C45DF84.5990A4E4@mindspring.com> References: <20020116023458.E17814-100000@blues.jpj.net> <3C45DF84.5990A4E4@mindspring.com>
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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
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