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| Description | Signal | 9-pin | 25-pin |
| Carrier Detect | CD | 1 | 8 |
| Receive Data | RD | 2 | 3 |
| Transmit Data | TD | 3 | 2 |
| Data Termial Ready | DTR | 4 | 20 |
| Signal Groung | SG | 5 | 7 |
| Data Set Ready | DSR | 6 | 6 |
| Request to Send | RTS | 7 | 4 |
| Clear to Send | CTS | 8 | 5 |
| Ring Indicator | RI | 9 | 22 |
Page updated 98/07/14
