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APC BackUPS Pro Cable Pinout -
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
Signal Name
RX / Shutdown 1 via R=4k to 3 TxD, also connected via R=4kOhm to pin 1 (DCD)
TX / AC Fail 2 2,9 RxD, RI
Common 4,9 5 GND

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