9 Pin to 25 Pin Serial Cable Pinout -
| 9-Pin | 25-Pin | |
|---|---|---|
| Carrier Detect | 1 | 8 |
| Receive Data | 2 | 3 |
| Transmit Data | 3 | 2 |
| Data Terminal Ready | 4 | 20 |
| System Ground | 5 | 7 |
| Data Set Ready | 6 | 6 |
| Request to Send | 7 | 4 |
| Clear to Send | 8 | 5 |
| Ring Indicator | 9 | 22 |
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