APC Back Pro UPS cable
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APC Back Pro UPS cable

pinout

9 pin D-SUB male
9 pin D-SUB male connector  to the UPS
UPS
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
PC
Signal Name
RX / Shutdown1via R=4k to 3TxD, also connected via R=4k to 1 (DCD)
TX / AC Fail22,9RxD, RI
Common4,95GND

At the PC end pins 4,6,8 (DTR, CTS, DSR) shorted.

9 pin D-SUB female
9 pin D-SUB female connector  to the computer

Source:www.pinouts.ru


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