A KNX bus coupler consists of the bus coupler controller with microcontroller and the transmission module.The KNX bus coupler is the interface between the application modules and the KNX bus. Due to increasingly memory-intensive function logics and address extensions, even controllers / chipsets are transferred to the user interface (modules) and the bus coupler is only used for managing group addresses and ensuring a standardized data transmission according to the KNX protocol. In the normal case, the application is loaded into the bus coupler. Each KNX device with a red / black bus connection terminal has a bus coupler. In top hat rail-mounted devices such as KNX switch actuators, KNX dimming actuators, etc., the bus coupler is not visible as a single device, but integrated in the device. In the case of touch sensors, the bus couplers must usually be ordered separately from the push button. The device (temperature controller, motion sensor, push button sensor, etc.) is plugged onto the bus coupler via a multi-pole application interface. As a rule, you must order the bus coupler and the application modules from the same manufacturer. You cannot, for example, operate a Gira KNX push button with a Hager KNX bus coupler. More often, touch sensors and room controllers (combined push buttons with room temperature controllers) incl. bus couplers are supplied. Please pay attention to the description of the product and the price. Eibabo provides all EIB, KNX bus couplers of the relevant KNX brand manufacturers, particularly, ABB, Berker, Busch-Jaeger, Gira, Hager, Jung, Lingg & Janke, Merten, Siemens, Theben.