This article explains how to use infrared to comunicate diferent kinds of devices. These devices are PCs with Debian GNU/Linux and some HP Jornada 540 and Compaq iPAQ, a kind of PDAs. We have tested the connection between two PCs, a PC and a HP Jornada, and a PC and a Compaq iPAQ.
To test infrared, we have used infrared special devices connected to the serial port. These devices are known as IR Dongles, and in these tests we have used the ACTISYS-IR 220L plus IR Dongles.