As we show in this article, off the shelf radio modules called Short Range Device (SRDs) with an integrated microcontroller are here, making home construction of a wireless RS232 link a reality for DIY constructors.Wireless transmission of ‘information’, be it digital data, music or video, is sure to find wide application areas. Today, those of you with an active interest in ‘over-the-air’ technology have a large number of options to choose from, ranging from transmission of infrared light pulses (remote controls, IrDA) right up to more challenging fields like RF applications called DECT, Bluetooth, Wireless LAN and so on. For ‘large’ Windows computers you can buy ready-made modules which are not only easy to add to existing equipment, but also certified and complete with a manufacturer’s product warranty, not forgetting a suitable driver for the software link.