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9 pin D-SUB male connector layout
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 layout
9 pin D-SUB female connector
Pinout status: +1 -1
According to 2 reports in our database (1 positive and 1 negative) the Minuteman UPS pinout may be incorrect.

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Minuteman UPS visual pinout:click to enlarge
Source(s) of this and additional information: Tommy"s pinout Collection by Tommy Johnson, from Hardware Book
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