![](/images/new-backgrounds/1184125/184125159x1.webp)
80Appendix A Technical specifications
Figure 28 Serial cable (9-pin D-sub plug to RS-232-C modem plug)
10 ft
(3.05 m)
Pin 5 | Pin 1 |
|
|
|
| Pin 1 | Pin 13 |
|
|
| |
Pin 9 | Pin 6 | Pin 14 | Pin 25 |
CAB0056A
Table 20 provides the multiple DB9/DB25 serial interface cable pinouts.
Table 20 Multiple DB9 and DB25 connector pinouts
Serial port |
| Serial port |
|
| Serial port |
| Serial port |
|
DB9 connector | DB25 connector |
| DB25 connector | DB9 connector | ||||
|
|
|
|
|
|
|
|
|
Pinout | Signal | Pinout | Signal |
| Pinout | Signal | Pinout | Signal |
|
|
|
|
|
|
|
|
|
2 | RXD | 3 | TXD | > | 2 | RXD | 3 | TXD |
|
|
|
|
|
|
|
|
|
3 | TXD | 2 | RXD | > | 3 | TXD | 2 | RXD |
|
|
|
|
|
|
|
|
|
4 | DTR | 20 | DSR | > | 6 | DTR | 6 | DSR |
|
|
|
|
|
|
|
|
|
5 | Ground | 7 | Ground | > | 7 | Ground | 5 | Ground |
|
|
|
|
|
|
|
|
|
6 | DSR | 6 | DTR | > | 20 | DSR | 4 | DTR |
|
|
|
|
|
|
|
|
|
7 | RTS | 4 | RTS | > | 5 | CTS | 8 | CTS |
|
|
|
|
|
|
|
|
|
8 | CTS | 5 | CTS | > | 4 | RTS | 7 | RTS |
|
|
|
|
|
|
|
|
|
Modem cable specifications
If you need to connect a modem to a VPN Router 2750, you must obtain an appropriate modem cable. The modem cable must have a