Bus coupler Up KNX. Bus coupler Up, interface between user module and bus line. For installation in standard 58 mm switch boxes. Installation without claws, via support ring using device screws. The bus coupler Up is a KNX component in a flush-mounted housing with support ring. It represents the mechanical, electrical and data interface between the user modules and the bus line. By programming with an application (software), telegrams can be generated and sent, received and evaluated. The bus coupler is dimensioned for installation in standard 58 mm flush-mounted switch boxes. Installation takes place via a support ring using the device screws of the switch box. A connection terminal is required to connect the bus line. The bus coupler Up is suitable for connecting user modules of all available Berker designs. The user module and bus coupler must be of the same make.