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| 9 pin D-SUB female connector |
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| 9 pin D-SUB male connector |
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | CD |  |
Carrier Detect |
| 2 | RXD | |
Receive Data |
| 3 | TXD |  |
Transmit Data |
| 4 | GND |  |
System Ground |
| 5 | CTS | |
Clear to Send |
| 6 | DSR | |
Data Set Ready |
| 7 | RI | |
Ring Indicator |
| 8 | RTS | |
Request to Send |
| 9 | DTR | |
Data Terminal Ready |