Date: Tue, 23 Feb 1999 07:21:24 +0100 (CET) From: Leif Neland <leifn@neland.dk> To: David Kelly <dkelly@hiwaay.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: How to control a relay for the printer Message-ID: <Pine.BSF.4.05.9902230712520.1752-100000@arnold.neland.dk> In-Reply-To: <199902230111.TAA30344@nospam.hiwaay.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, 22 Feb 1999, David Kelly wrote: > Leif Neland writes: > > I have spare com-ports, could I use some modemcontrol-bits to control the > > relay? > > That is one way. It matters as to what the coil voltage and current your > relay requires. Not likely you will be able to activate the relay with > the very small current available on the serial port. The relay is an industrial device in a 10-pin box, integral psu and electronic cut-off delay, and only need its input to be short circuited to activate. I probably just need one optocoupler and/or transistor. So I just need to know how to turn say DTR on and off. Leif > Think a cleaner and quicker solution would be to buy an X-10 Appliance > Module to plug the printer in, and a cheap controller ($15). When you > want to print, push the ON button (several times to make sure it works) > for the Housecode and Unit of your printer. > I haven't seen any X-10 here in the .dk-domain :-( > Modern printers power themselves down when not used for a while. This isn't a modern printer. It's a working horse 18 pages/min duplex printer, I got free, because it was damaged by water from a leaking roof. I can live with the display being broken; it couldn't pay to repair it, the service company told... Leif To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.05.9902230712520.1752-100000>