Alarm system has sensors, actuators that correspond with switching center only via high current electrical system of building installation using electrical voltages with different frequencies

摘要

The system has sensors (34,40) and actuators (13,18) that correspond with a switching center (1) exclusively via the high current electrical system (46-48) of a building installation. The correspondences between the sensors, actuators and center are represented by electrical voltages with at least two different frequencies. pulse code modulated signals with different patterns can be used..