KNX room temperature controller flush-mounted/PI with 4-way button interface. For System M. The device is a room temperature controller and a binary input. Depending on the operating mode, the current temperature setpoint and the room temperature, a control variable for the heating or cooling controller is transferred to the KNX. The temperature can be recorded either via the internal or external temperature sensor, which must be connected to the button interface. The button interface generates an internal signal voltage for connecting a maximum of four conventional buttons or potential-free contacts. Two of these inputs can be used to connect low-current LEDs. With integrated bus coupler. The connection to the bus is made via a bus connection terminal. Functions of the room temperature controller: Controller type: 2-point control, continuous PI control, switching PI control (PWM). Output: continuous in the range 0 to 100% or switching ON/OFF. Controller operation: Heating with one controller output. Cooling with one controller output. Heating and cooling with separate controller outputs. Heating and cooling with one controller output. 2-stage heating with 2 control outputs. 2-stage cooling with 2 control outputs. Operating modes: comfort, comfort extension, standby, night reduction, frost/heat protection. Operation: setpoint adjustment in the range can be parameterized with the adjustment wheel. Presence button functions can be parameterized/switched off. Valve protection, controller deactivation. Functions of the button interface: switching, dimming, external blinds, value transmitter (dim value transmitter, extension for light scenes with/without memory function, temperature value transmitter, brightness value transmitter). Button interface: up to 4 inputs, 2 of which can be used as outputs and one for connecting the remote sensor. Output voltage: 5 V (SELV). Output current: max. 0.8 mA. Max. cable length: inputs/outputs max. 5 m, remote sensor max. 50 m. Material: glossy thermoplastic. Color: polar white, glossy.