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9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the UPS
The pinout should fit 3 devices/models. Click to list>
Pin# Signal Type Function
1 RS-232 Earth Ground Signal Common for all RS-232 port signals (earth ground referenced)
2 RS-232 Transmit Output  Serial communication mode - output signal line. 
3 RS-232 Receive Input / Shutdown Serial communication mode - input signal line. Contact Closure mode - shuts down UPS if signal is held high (RS-232 level) for 200 milliseconds while UPS is operating in battery mode.
4 AC Line Fail (normally closed) Contact Closure mode - opened when AC line fails and UPS is operating in battery mode (breaks connection between Pin#4 and Pin#5).
5 Contact Closure Common / RS-232  Common Signal Common for all Contact Closure group / RS-232 Signal Common line.
7 Low Battery (normally open) Contact Closure mode - closed when remaining on-battery runtime drops below the under-defined time limit (makes connection between Pin#7 and Pin#5).
9 AC Line Fail (normally open)  Contact Closure mode - closed when in battery mode (makes connection between Pin#9 and Pin#5).
 
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HP PowerWise L600/L900/L1250 UPS interface visual pinout:click to enlarge
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