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Cables
Serial Port to 9-Pin COM Port on PC
Gateway’s |
| CCITT Signal |
| PC’s |
1 DCD | DCD | 1 | ||
2 RXD | TXD | 3 | ||
3 TXD | RXD | 2 | ||
4 DTR | DSR | 6 | ||
5 SGND | SGND | 5 | ||
6 DSR | DTR | 4 | ||
7 RTS | CTS | 8 | ||
8 CTS | RTS | 7 | ||
9 RI | RI | 9 |
Serial Port to 25-Pin DCE Port on Modem
Gateway’s |
| CCITT Signal |
| Modem’s |
|
|
|
| Port |
1 | DCD | 8 | ||
2 | RXD | 3 | ||
3 | TXD | 2 | ||
4 | DTR | 20 | ||
5 | SGND | 7 | ||
6 | DSR | 6 | ||
7 | RTS | 4 | ||
8 | CTS | 5 | ||
9 | RI | 22 |
Serial Port to 25-Pin DTE Port on PC
Gateway’s | Null Modem |
| PC’s |
1 DCD | 1 | 1 | 8 DCD |
2 RXD | 2 | 3 | 3 TXD |
3 TXD | 3 | 2 | 2 RXD |
4 DTR | 4 | 8 | 20 DTR |
5 SGND | 5 | 20 | 7 SGND |
6 DSR | 6 | 7 | 6 DSR |
7 RTS | 7 | 4 | 4 RTS |
8 CTS | 9 | 5 | 5 CTS |
9 RI | 20 | 6 | 22 RI |