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APC Smart UPS Cable Pinout - AllPinouts

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connector or cable wiring APC Part # 940-0024C (black cable). Should work with APC PowerChute Plus, PowerChute V/S, PowerChute Pro software

9 pin D-SUB male connector layout
9 pin D-SUB male connector to the UPS

9 pin D-SUB female connector diagram
9 pin D-SUB female connector to the PC

Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
Signal Name
TX / AC Fail 2 2 Rx, Received Data
RX / Shutdown 1 3 Tx, Transmitted Data
Common 9 5 GND


  • At the PC end: pins 1,4 (DCD, DTR) shorted; pins 7,8 (RTS, CTS) shorted.


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