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Minuteman UPS

pinout

9 pin D-SUB male
9 pin D-SUB male connector
Pin Description
1Unused
2Battery power
3Unused
4Common (same as 7)
5Low battery
6RS-232 level shutdown
7Common (same as 4)
8Ground level shutdown (A500 and above, reserved on <A500)
9Reserved

Pins 2 and 5 are connected to Common when they are true.
On pin 6, an rs-232 high level (>9V) will shutdown, when running off the battery.
On pin 8, shorting to ground will shutdown.

9 pin D-SUB female
9 pin D-SUB female connector

Source:www.pinouts.ru