The KELOX BUS system is the intelligent individual room control unit of the future for maximum comfort and energy efficiency for surface temperature control. The control unit of the system is the KM692K KELOX BUS room thermostat - Digital in a modern design. With comprehensive functionality for access to all room-specific and system-specific parameters, as well as precise temperature recording, it allows the set-up of perfectly coordinated individual room control for maximum user comfort. Via the bus connection, it ensures the bi-directional data interchange with the KM693 bus connection unit for the retrieval of numerous status messages, as well as their display on the large, clearly laid out display. It is operated using a rotary knob with a push-turn mechanism and fine detent, as well as the clearly laid out, language-neutral indicator of the high-quality display.