Alarm system for houses and other buildings etc.

摘要

The alarm system has a central unit and several external units. The central unit has a communication device (12). This exchanges data telegrams with corresponding communication units of the central units via a current supply network. The central unit also has a receiver and/or a transmitter unit (14,15) to exchange data telegrams with corresponding transmitter and/or receiver units of the external units via a radio connection. The data telegrams from the external units and from the communication unit (12) may also be sent from a transmitter to the central unit. The current supply network may be an existing ac mains supply.