APC BackUPS Pro Cable Pinout -
| UPS Signal Name | DB-9 Male (UPS end) | DB-9 Female (PC end) | PC 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 |
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