TrippLite Support has not responded to my email messages, so before contacting the TrippLite CPO, I am hoping someone out there on this Linux list has had success with the serial (DBD-9) interface from UPS to SuSE 7.3. With the ups monitoring software installed and TrippLite BC PRO 850 UPS connected, my system shuts down within seconds of entering: rcups start I am using a 9-wire cable that connects the same pins (straight-through) on either end. I have tried genericups type numbers of "4" and "5". Further, due to no answer from TrippLite Support, I attempted to do some reverse engineering. I disconnected the UPS from 110v, and monitored resistences and voltages on the unit's DBD-9 connector. I expect there are contact-closures on the other side. It ran my computer and CRT 40 minutes before the low-battery indicator lit up. Through the whole process, pins 3,6,7,8 indicated near-zero resistance together and connected to ground. No changes occurred through the power disconnect and discharge sequence! Your help appreciated. It seems like a good unit, and I would hate to have to return it to the vendor. ... Reed (reply to alta@alta-research.com) ----------email-to-TrippLite------------ Dear technical Support ... I am having difficulty getting your BC PRO 850 to work with Linux. Can you send me pin-outs for the the DBD-9 connector on the BC PRO 850? Or, can you tell me where to find the information? In other words, I need details for the "contact closure" style interface -- which pins are used for what event? I have spent a number of hours attempting to get the unit to work with a Linux system, without success. The BC PRO 850 manual contains no informantion on the DBD-9 interface. I have searched the TrippLite web site, without success. I have attempted to locate the active power-fail pins by taking ohm and voltage readings... The technical information would be a big help. No RS-232 cable was supplied with the unit. I am using a straight-through cable, where each pin is connected to the same pin at the other end. Sincerely ... Reed -- Reed White - ALTA RESEARCH - www.alta-research.com Phone: 877-360-2582 - Email: alta@alta-research.com