Konnex (KNX), known through the European Installation Bus (EIB), is a standardised digital control system which controls not only the lighting but also other systems such as heating, ventilation and solar screening equipment. KNX is suitable as a network of electronic installations for building automation. Remote monitoring and control make it easy to use. The data is transmitted over a separate 24V control line- twisted pair wire at a rate of 9.6 Kbits/s. The decentralised communication is bidirectional so that the receiver can also provide feedback. Each bus device can transmit independently. An allocation of priorities ensures proper communication and prevents data collisions. Due to the individual addresses of the sensors and actuators, this allocation is flexible and can easily be changed. KNX is used in domestic buildings and in large installations such as offices or airports.