User Guide

7
DB9 Interface Connectors
DB9 Interface
Connectors
There are Quadcable and Octacable models available with DB9 connectors on a
fanout cable.
DB9 Pinouts Use this table and figure for information about the
DB9 connectors that are used on the Quadcable and
Octacable.
Building DB9
Female Loopback
Plugs
Loopback plugs are used with the diagnostics to test serial
ports. This loopback is used with the Quadcable and
Octacable. Wire the following pins together:
• Pins 1 to 4 to 6
•Pins 2 to 3
• Pins 7 to 8 to 9
Pin
RS-232 Signal
1CD
2RxD
3TxD
4DTR
5Signal GND
6DSR
7RTS
8CTS
9Not used
Pin 1
Pin 5
Pin 6
Pin 9
DB9 Male
Pin 1
Pin 5
Pin 6
Pin 9
RS-232 (Back View)