Common Options : Full-Duplex, Half-Duplex

Details

The Duplex Select feature is usually found under the Onboard Serial Port 2 BIOS function. It's slaved to the 2nd serial port so if you disable the 2nd serial port, this feature will disappear from the screen or appear grayed out.

This feature allows you to determine the transmission mode of the IR port. Selecting Full-Duplex will permit simultaneous two-way transmission, like a conversation over the phone. However, selecting Half-Duplex permits transmission in one direction at any one time which is more like a conversation over the walkie-talkie.

Naturally, the Full-Duplex mode is the faster and more desirable option. You should use Full-Duplex if possible. Consult your IR peripheral's manual to determine if Full-Duplex is supported or not.