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

9 pin D-SUB male connector layout 9 pin D-SUB female connector diagram