In Reply to: Re: HP Powerwise 2100 UPS Info? posted by Bart Berden on 09/25/01 at 2:12 PM:
The problem is with the outlet that the UPS itself is plugged into. The two most common problems are a missing ground connection and having the hot and neutral lines reversed. Normally, you wouldn't be aware of either unless you tested for them since the outlet appears to work fine. But either problem is a safety hazard.
The warning light wouldn't be affected by not having a load on the output.
By the way, if you want to play with the RS-232 port, here's the pinout.
pin 2 - RS-232 receive
3 - RS-232 xmit
7 - ground
22 - RS-232 high level when AC fails
24 - RS-232 high level when remaining battery time drops below user-configurable threshold
1 - RS-232 input - shuts UPS down when held high for 5 seconds
10 - AC fail normally open
11 - AC fail normally closed
23 - AC fail common
12 - Low battery normally open
13 - Low battery normally closed
25 - Low battery common
These relay contacts are the same as the RS-232 signals, just using open relay contacts instead of RS-232 signals.