 25 pin D-SUB male connector at the computer | | Pin | Port | Name | Dir | Description |
|---|
| 1 | | n/c | | Not connected |
| 2 | 1 | TXD |  | Transmit Data |
| 3 | 1 | RXD |  | Receive Data |
| 4 | 1 | RTS | | Ready To Send |
| 5 | 1 | CTS | | Clear To Send |
| 6 | 1 | DSR | | Data Set Ready |
| 7 | 1+2 | GND | - | Ground |
| 8 | 1 | DCD | | Data Carrier Detect |
| 9 | | n/c | | Not connected |
| 10 | | n/c | | Not connected |
| 11 | 2 | DTR | | Data Terminal Ready |
| 12 | 2 | DCD | | Data Carrier Detect |
| 13 | 2 | CTS | | Clear To Send |
| 14 | 2 | TXD | | Transmit Data |
| 15 | | n/c | | Not connected |
| 16 | 2 | RXD | | Receive Data |
| 17 | | n/c | | Not connected |
| 18 | | n/c | | Not connected |
| 19 | 2 | RTS | | Ready To Send |
| 20 | 1 | DTR | | Data Terminal Ready |
| 21 | | n/c | | Not connected |
| 22 | 1 | RI | | Ring Indicator |
| 23 | 2 | DSR | | Data Set Ready |
| 24 | | n/c | | Not connected |
| 25 | 2 | RI | | Ring Indicator |
Note: Direction is DTE (Computer) relative DCE (Modem).
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