Lexmark Optra Color 45 User Manual page 263

Installing Options
246
Chapter 10: Infrared Adapter
3
Plug the adapter cable into the infrared port.
4
Reconnect the power cord to the printer and a properly
grounded electrical outlet.
If any light on the infrared adapter comes on when the
printer is plugged in, the adapter is connected to the port
correctly.
5
Aim the computer infrared port at the infrared port on the
front of the Tri-Port interface option card.
Refer to the documentation that came with your computer
for information about your computer infrared port.