serial interface cable This cable should be used for DTE to DCE (for instance computer to modem) connections with hardware handshaking.
9 pin D-SUB female connector
to the Computer
25 pin D-SUB male connector
to the modem
Modem DSUB9 to DSUB25 cable
| Female | Male | Dir |
|---|---|---|
| Shield | 1 | |
| Transmit Data | 3 | 2 |
| Receive Data | 2 | 3 |
| Request to Send | 7 | 4 |
| Clear to Send | 8 | 5 |
| Data Set Ready | 6 | 6 |
| System Ground | 5 | 7 |
| Carrier Detect | 1 | 8 |
| Data Terminal Ready | 4 | 20 |
| Ring Indicator | 9 | 22 |
Modem DSUB25 to DSUB25 cable
| Female | Male | Dir |
|---|---|---|
| Shield Ground | 1 | 1 |
| Transmit Data | 2 | 2 |
| Receive Data | 3 | 3 |
| Request to Send | 4 | 4 |
| Clear to Send | 5 | 5 |
| Data Set Ready | 6 | 6 |
| System Ground | 7 | 7 |
| Carrier Detect | 8 | 8 |
| Data Terminal Ready | 20 | 20 |
| Ring Indicator | 22 | 22 |