25 pin D-SUB female connector at the
computer.
25 pin D-SUB male connector at the
cable.
This port is located in SUN Sparcs such as SUN LX/Classic/SS4/5/10/20 and has both serial ports (A/B) in the same connector. Simply plugging in a regular serial cable in results in accessing port A.
| Pin | Name | Port | Dir | Description |
|---|---|---|---|---|
| 2 | TXD | A | OUT | Transmit Data |
| 3 | RXD | A | IN | Receive Data |
| 4 | RTS | A | OUT | Request to Send |
| 5 | CTS | A | IN | Clear to Send |
| 6 | DSR | A | IN | Data Set Ready |
| 7 | GND | - | - | System Ground |
| 8 | CD | A | IN | Carrier Detect |
| 11 | DTR | B | OUT | Data Terminal Ready |
| 12 | CD | B | IN | Carrier Detect |
| 13 | CTS | B | IN | Clear to Send |
| 14 | TXD | B | OUT | Transmit Data |
| 15 | TC | A | IN | Transmit Clock from DCE, usually not used |
| 16 | RXD | B | IN | Receive Data |
| 17 | RC | A | IN | Receive Clock from DCE, usually not used |
| 18 | TC | B | IN | Transmit Clock from DCE, usually not used |
| 19 | RTS | B | OUT | Request to Send |
| 20 | DTR | A | OUT | Data Terminal Ready |
| 21 | TCO | A | OUT | Transmit Clock from DTE, usually not used. |
| 25 | TCO | B | OUT | Transmit Clock from DTE, usually not used. |
Notes
- Direction is DTE (Computer) relative DCE (Modem).
- Do not connect SHIELD(1) to GND(7).