Long-distance IrDA link:

The infrared data link discussed in this article is based on the IrDA (Infrared Data Association) standard, and is suitable for any modern computer in combination with any peripheral device having an RS232 se rial interface. The long-distance IrDA system goes even further, however. A full-duplex mode operating at up to 19.2 kbit/s coupled with RTS/CTS handshaking enables links to be established which used require cables. In contrast with the standard IrDA specification (range up to 3 m), distances of up to 20 m may be covered.