> On Tuesday 08 January 2002 07:47 pm, you wrote: > > If it is just a serial cable... > I don't think it's a normal serial cable. > The UPS PowerChute cable pinout is Male DB9 > to Female DB9 with this wiring: > male pin 1 to female pin 3 > male pin 2 to female pin 2 > male pin 9 to female pin 5 > short pins 1 and 4 on female > short pins 7 and 8 on female > I made mine for a Smart UPS-1400 and I'm guessing > the 400 is the same. I never tried to pinout the Powerchute cable because I think there is a resistor in there. I contributed to the UPS-HOWTO a long time ago with these instructions on how to make a cable for an APC BACK-UPS (or SMART-UPS in "dumb" mode): What they don't tell you in the APC manual, and they should, is that you need to buy a 10 KOhm resistor (50 cents at Radio Shack) and connect pins 5 and 8 on the UPS side using the resistor. Pin 8 provides the "common referenced supply no greater than 40vdc". Here's how you would make the cable (the 1st three lines are the same as the HOWTO): PC side UPS side pin 7 <------------------------------> 1 ShutDownUPS 1 <------------------------------> 2 LineFail 5 <------------------------------> 4 (same as 9 ) GND ? your choice <-----------------> 5 LowBatt | > 10 < KOhm | 8 So then when the LowBatt line is HIGH then the computer has 2 minutes to shut down before the battery runs out. P.S. The APC manual says to use only pin 4 as the common and even though in the diagram it says that pin 9 is connected to pin 4 you might want to be sure and use pin 4 . This differs from the instructions in the HOWTO. You would do well to read the Linux UPS-HOWTO and see if Roger's infor- mation seems to be better than mine. YMMV and it's been so long that I can't remember if mine is right or not. That question mark there doesn't exactly inspire confidence. -- Jim Ockers (ockers@ockers.net) Contact info: please see http://www.ockers.net/ Fight Spam! Join CAUCE (Coalition Against Unsolicited Commercial Email) at http://www.cauce.org/ .