Pin Mapping
This is one very common mapping which will work with software that relies on proper assertion of the CD signal.
| Signal Name and Abbreviation | DB-25 Pin | DE-9 Pin | Direction | DE-9 Pin | DB-25 Pin | Signal Name Abbreviation | |
|---|---|---|---|---|---|---|---|
| Frame Ground (chassis) | FG | 1 | – | – | 1 | FG | |
| Transmitted Data (TD) | TxD | 2 | 3 | → | 2 | 3 | RxD |
| Received Data (RD) | RxD | 3 | 2 | ← | 3 | 2 | TxD |
| Request To Send | RTS | 4 | 7 | → | 8 | 5 | CTS |
| Clear To Send | CTS | 5 | 8 | ← | 7 | 4 | RTS |
| Signal Ground | SG | 7 | 5 | 5 | 7 | SG | |
| Data Set Ready | DSR | 6 | 6 | ← | 4 | 20 | DTR |
| Data Carrier Detect (CD) | DCD | 8 | 1 | ||||
| Data Terminal Ready | DTR | 20 | 4 | → | 1 | 8 | DCD |
| 6 | 6 | DSR | |||||
Read more about this topic: Null Modem
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