Dell Latitude C840 - Manual (Page 110)

2. Press until you locate Infrared Data Port under Basic Device Configuration.
3. Press the down-arrow key to highlight Disabled next to Infrared Data Port.
4. Press the right-arrow key to change the setting to a COM port.
Ensure that the COM port that you select is different from the COM port assigned to the serial connector.
5. Press the down-arrow key to select Infrared Mode, and press the right-arrow key to change the setting to Fast IR or Slow IR.
Dell recommends that you use Fast IR. If the infrared device cannot communicate with your computer, turn off the computer and repeat steps 1 through
5 to change the setting to Slow IR.
6. Press to save the changes and exit the system setup program.
If you are prompted to restart your computer, click Yes.
7. Follow the instructions on the screen while the infrared sensor driver is being installed.
8. At the end of the installation process, click Yes to restart the computer.
After you enable the infrared sensor, you can use it to establish a link to an infrared device. To set up and use an infrared device, see the infrared device
documentation and Windows Help.
NOTE: If the infrared device cannot communicate with your computer after you repeat steps 1 through 5 to change the system setup program setting to
Slow IR, contact the infrared device manufacturer.