EIA-449 (RS-449) Secondary
From HwB
Common names: EIA-449, RS-449, ISO 4902
Secondary (auxilary) channel
Pinout
| Pin | Name | RS232 | V.24 | Dir | Description |
|---|---|---|---|---|---|
| 1 | n/a | 101 |  |
Shield | |
| 2 | SSR | SRR | 122 |  |
Secondary Receiver Ready |
| 3 | SSD | SSD | 118 |  |
Secondary Send Data |
| 4 | SRD | SRD | 119 | |
Secondary Receive Data |
| 5 | SG | SG | 102 | |
Signal Ground |
| 6 | RC | RC | 102b | |
Receive Common |
| 7 | SRS | SRS | 120 | |
Secondary Request To Send |
| 8 | SCS | SCS | 121 | |
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.