Two-Wire modem (9-25) Cable Pinout - AllPinouts
From AllPinouts
serial interface cable This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.
9 pin D-SUB female connector to the Computer
25 pin D-SUB male connector to the Modem
| Female | Male | Dir | |
|---|---|---|---|
| Shield Ground | 1 | ||
| Transmit Data | 3 | 2 | OUT |
| Receive Data | 2 | 3 | IN |
| System Ground | 5 | 7 | |
| Jumper these: | |||
| Request to Send | 7 | OUT | |
| Clear to Send | 8 | IN | |
| Data Set Ready | 6 | IN | |
| Carrier Detect | 1 | IN | |
| Data Terminal Ready | 4 | OUT | |
| Request to Send | 4 | OUT | |
| Clear to Send | 5 | IN | |
| Data Set Ready | 6 | IN | |
| Carrier Detect | 8 | IN | |
| Data Terminal Ready | 20 | OUT |
