Stan Shankman wrote:
I have this UPS (Uninterruptible Power Supply) that needs a serial
cable to communicate with the computer.
Minuteman Alliance A425
425-Watt Uninterruptible Power Supply

Not really - it is a 425VA UPS (about 275 W). Here's the DB-9 pin outs.

http://www.minutemanups.com/support/...e_manl_eng.pdf

This is a 10 year old UPS and no doubt the batteries are gone by now.
I'd scrap it and buy a 350VA APC UPS next time it is on sale at Staples
for $30.