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.