UPS Signal Name |
DB-9 Male (UPS end) |
DB-9 Female (PC end) |
PC Signal Name |
Tx | 7 | 2 | RxD |
Rx | 9 | 3 | TxD |
Common | 8 | 5 | GND |
Pins 7 and 8 shorted at the PC end of the connector.
Pins 1 and 4 and 6 shorted at the PC end connector.