A method of operating a security system is disclosed as including sensors for detecting occurrence of at least one security related event, e.g. motion, and alarm devices, in which the sensors and alarm devices are operatively associated with each other, e g. by being connected with each other via a digital...http://www.google.de/patents/US7187279?utm_source=gb-gplus-sharePatent US7187279 - Security system and a method of operating
