The SRP-04 roller shutter controller is designed for controlling window shutters or other devices powered by single-phase AC 230 V motors. Control can be carried out locally or centrally using the reflector louver buttons. In case of local control, double and single buttons can be used. Only double buttons can be used for central control. For functionality, the controller allows two independent comfort settings (lower and upper) and maximum shutter motion time. The SRP-04 can work as an independent controller or be combined into sections. The special function of the central control inputs allows the blind to be locked in a closed or open position. This enables cooperation with alarm systems and additional devices such as weather station, light sensor, rain sensor, clocks. Triggering signals are pulses from the N line. In the case of an extended central control system, individual controllers can be energized from different phases while maintaining a common N line.