| General assignment of V.24 (RS-232C) connectors | ||||
|---|---|---|---|---|
| ||||
| DB25 - male (plug) | DB25 - female (socket) | |||
| 2 | TxD | 2 | RxD | |
| 3 | RxD | 3 | TxD | |
| 4 | RTS | 4 | CTS | |
| 5 | CTS | 5 | RTS | |
| 6 | DSR | 6 | DTR | |
| 7 | GND | 7 | GND | |
| 8 | DCD | 8 | DCD | |
| 20 | DTR | 20 | DSR | |
| 22 | RI | 22 | RI | |
|
| ||||
| DB9 - male (plug) | DB9 - female (socket) | |||
| 1 | DCD | 1 | DCD | |
| 2 | RxD | 2 | TxD | |
| 3 | TxD | 3 | RxD | |
| 4 | DTR | 4 | DSR | |
| 5 | GND | 5 | GND | |
| 6 | DSR | 6 | DTR | |
| 7 | RTS | 7 | CTS | |
| 8 | CTS | 8 | RTS | |
| 9 | RI | 9 | RI | |