| DB-9 Pin Number |
Device 1 Pin Name |
Direction | APC Pin Number |
Device 2 Pin Name |
Description |
|---|---|---|---|---|---|
| 1,4,6 | tied | hardware flow control | |||
| 2 | RX | UPS->PC | 1 | L | |
| 3 | TX | PC->UPS | 2 | R | |
| 5 | GND | --- | 3 | GND | |
| 7,8 | tied | hardware flow control |
Comment:
RX and TX are wrong.
TX should be 1 and RX should be 2 on APC side
Signal levels are zero to positive voltage only
правильная
с ошибками