DB-9 Connector
The following figure and table give the pin locations and descriptions of the DB-9 connector, the 10-position modular jack to DB-9 cable, the cable adapter for the eight-port board, and the DB-9 connectors to the 16-port breakout box.
DB-9 Connector Pin Locations
DB-9 Pin Descriptions
| DB-9 Pin | 232 Signal DTE | 485 Signal |
|---|---|---|
| 1 | DCD* | GND |
| 2 | RXD | CTS+ (HSI+) |
| 3 | TXD | RTS+ (HSO+) |
| 4 | DTR* | RXD+ |
| 5 | GND | RXD– |
| 6 | DSR* | CTS– (HSI–) |
| 7 | RTS | RTS– (HSO–) |
| 8 | CTS | TXD+ |
| 9 | RI* | TXD– |
* These signals are "No Connect" on the isolated 232 boards or ports 9–16 of the PCI-232/16 legacy board.