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6 pin RJ12 (6P6C) female connector layout
6 pin RJ12 (6P6C) female connector
rarely used 6-pin jack
Pin Signal Description
1 <--  Shutdown when set by computer for 1-5 seconds.
2 -->  On battery power
3 -->  Low battery
4 --  Signal ground
5 <--  Begin signalling on other pins
6 N/C   
According to 2 reports in our database (0 positive and 2 negative) the APC Back-UPS Office connector pinout may be incorrect.

Is this pinout
APC Back-UPS Office connector visual pinout:click to enlarge
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