9 pin D-SUB male connector at the
computer.
RS-449 is also know as: EIA-449, ISO 4902. Secondary (auxilary) channel.
| Pin | Name | RS232 | V.24 | Dir | Description |
|---|---|---|---|---|---|
| 1 | n/a | 101 | - | Shield | |
| 2 | SSR | SRR | 122 | IN | Secondary Receiver Ready |
| 3 | SSD | SSD | 118 | OUT | Secondary Send Data |
| 4 | SRD | SRD | 119 | IN | Secondary Receive Data |
| 5 | SG | SG | 102 | - | Signal Ground |
| 6 | RC | RC | 102b | - | Receive Common |
| 7 | SRS | SRS | 120 | OUT | Secondary Request To Send |
| 8 | SCS | SCS | 121 | IN | Secondary Clear To Send |
| 9 | SC | SC | 102a | - | Send Common |
Notes
- Direction is DTE (Computer) relative DCE (Modem).
- RS232 column is RS232 circuit name.
- V.24 column is ITU-TSS V.24 circuit name.