The KM693 KELOX BUS connection unit is the intelligent control unit for centralised information processing and communication with all system components. It records and uses numerous measurement data for individual, energy-efficient temperature control in every room, in order to achieve maximum user comfort. A 2-wire BUS connection that is protected against polarity reversal ensures the supply and communication with the connected room thermostats. The actuators are supplied directly via the power supply of the BUS connection unit. The highly-developed system software already fulfils all requirements of current and future systems in the standard version – adaptations and updates for a changing technological environment take place conveniently via a MicroSD card slot. As an Ethernet version, the system is integrated easily into the home network and can be conveniently controlled via PC and/or smartphone via the Internet and is therefore Smart Home ready.