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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!hunter.premier.net!news.mathworks.com!news.sprintlink.net!news-peer.sprintlink.net!nntp-hub2.barrnet.net!olivea!quack!quack.kfu.com!nsayer From: nsayer@quack.kfu.com (Nick Sayer) Subject: Re: UPC control software Message-ID: <nDyRI0u@quack.kfu.com> Sender: news@quack.kfu.com (0000-News(0000)) Organization: The Duck Pond public unix, +1 408 249 9630, log in as guest. References: <3277eb48.110093637@news.us.world.net> Date: Thu, 31 Oct 1996 15:42:51 UTC Lines: 23 michaele@mxim.com (Michael Enkelis) writes: >Is there a controll program or monitor for shutdown of system when a >UPS reports "ON-BATTRY". I have a APC SMART-UPS unit, >with RS-232 port (2400bps,8-N-1) Once upon a time there was a program called upsd. It would camp on a serial port checking the CD line every so often. If it went low for more than n minutes, it would start warning everyone and halt. What you did was take a 12 vdc "brick" and plug it into an outlet _not_ protected by the UPS and hook the + line to pin 7 and the - line to pin 8 of a DB-25 RS-232 port. When there was no power to the brick, CD would drop. This trick even works on stupid UPSes. The only time it doesn't work is if the power is restored after the halt takes place, but before the UPS runs out of power. Less likely than not. -- Nick Sayer <nsayer@quack.kfu.com> | "To envision how a 4-processor system N6QQQ @ N0ARY.#NORCAL.CA.USA.NOAM | running [SunOS] 4.1.x works, think of +1 408 249 9630, log in as 'guest' | four kids and one bathroom." URL: http://www.kfu.com/~nsayer/ | -- John DiMarco