I finally started trying to hook my two Linux servers up to my two APC Back-ups UPSs last night (one's a 600, one's a 650). I had monitoring and shutdown working back in the old house with the old UPS and a different version of Linux. I'd forgotten how annoying the cabling issues are. Ick. And I don't want to pay $40 each for cables, and I don't *especially* want to run their Powerchute software, either. Note that my two UPSs use "stupid" communications protocol, not "smart". There's actually a diagram in the Back-ups 600 manual showing what each connection on the 9-pin port is (I believe from reading how-tos and things that they 600 and 650 are about the same in this; the 650 manual doesn't actually give a diagram, though). The diagram actually looks like it would be better off with a pull-up resistor on the line it uses to signal line power fail (the 600 manual, at least, describes that line and two others as open-collector outputs). (Note: It may have sounded like I understand those terms; I don't really. I'm a *software* person. I took a computer instrument interfacing course once in college, but raw transistors are just weird; I kinda jumped from relays to digital logic.) I'm trying to use the "powerd" in the RedHat rpm (2.0.2-1). I'm using motherboard serial port B, which is /dev/ttyS1 I'm really pretty sure. (I've got a modem on /dev/ttyS0, and that works; and I've been using a breakout box, and changing things on /dev/ttyS1 with minicom definitely changes the lights on the breakout box). Using the detectups in that package (what a wonderful idea!), I can't get it to notice the existence of the UPS. I've tried configuring several of the suggested cables from various how-tos using my breakout box. I've also tried simply jumpering various pins that detectups says it monitors to ground, and to a hot line. Nothing I've done has gotten detectups to so much as twitch a finger. Both my motherboard and my UPS have 9-pin connectors. I'm using two straight-through 9 to 9 cables (m to f, too), two 9-to-25 adapters of suitable gender, and my breakout box which is 25 pin on both ends. I mention this in case it's somehow relevant. I'm being careful to read the cable instructions and use the 25-pin pin number not the 9 when I'm jumpering at the breakout box. Anybody have a clue they could spare? I really want to have auto-shutdown on power fail. The more disk and databases there are on these systems, the more I want it. (Though it does help that most of it's EXT3 filesystems now.) And we've had half a dozen power failures, at least three long enough to actually require a shutdown, already this year. -- David Dyer-Bennet, dd-b at dd-b.net / New TMDA anti-spam in test John Dyer-Bennet 1915-2002 Memorial Site http://john.dyer-bennet.net Book log: http://www.dd-b.net/dd-b/Ouroboros/booknotes/ New Dragaera mailing lists, see http://dragaera.info