Minuteman UPS

pinout

9 pin D-SUB male connector

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

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 connector

Source:www.pinouts.ru

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