 |
DB9 pin D-SUB male |
| Pin | Name | Direction | Description |
|---|---|---|---|
| 1 | CD | ← | Carrier Detect |
| 2 | RXD | ← | Receive Data |
| 3 | TXD | → | Transmit Data |
| 4 | DTR | → | Data Terminal Ready |
| 5 | GND | System Ground | |
| 6 | DSR | ← | Data Set Ready |
| 7 | RTS | → | Request to Send |
| 8 | CTS | ← | Clear to Send |
| 9 | RI | ← | Ring Indicator |
RS232 pinout and signals
Serial port pinout and signals
Full DB25 serial (RS232) port pinout and signals
DB25 pinout and signals