# DB9 Pinout

The pins below are found on a typical male (terminal side, or DTE) DB-9 serial port connector:

Pin | Signal | Direction | Description
--- | --- | --- | ---
1 | DCD | IN | Carrier Detect
2 | RXD | IN | Receive Data
3 | TXD | OUT | Transmit Data
4 | DTR | OUT | Data Terminal Ready
5 | GND | - | Signal Ground
6 | DSR | IN | Data Set Ready
7 | RTS | OUT | Request To Send
8 | CTS | IN | Clear To Send
9 | RI | IN | Ring Indicator