StarTech.com PCI2S422DB9 - Manual (Page 7)

Configuring Your Serial Card
The PCI2S422DB9 allows you to configure each port based on your needs and the
requirements of the serial devices you are connecting to each port. Consult the
documentation for the device(s) you wish to connect to the card to determine the correct
setting.
Full Duplex: Allows the port to simultaneously send and receive data between itself
and a serial device (default).
Half Duplex: The port will only send or receive data between itself and a serial
device at any one time.
NOTE: The settings for one port do not affect the settings of the other, and both ports
must be configured separately.
To Configure for Full Duplex
Jumper Configuration
CLOSED OPEN
1, 2 3
4, 5 6
7, 8 9
To Configure for Half Duplex
Jumper Configuration
CLOSED OPEN
2, 3 1
5, 6 4
8, 9 7
Instruction Manual
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Example: Both ports configured for Full Duplex (default)