Patent ID: 8199002
Filing Date: 2012-06-12
Classification: G08B

Abstract:
1. A wireless fire alarm system comprising a master station and a plurality of battery-powered fire detecting terminals which are linked for wireless communication with each other, said master station comprising: each of said fire detecting terminals comprising: a second battery energizing said fire detecting terminal; a fire sensor configured to detect a fire condition; a second information generator configured to generate said fire detection message upon detection of said fire condition; a second transmitter configured to transmit said fire detection message; a second receiver configured to receive said fire detection message and said fire information message; an alarm device configured to issue a fire alarm upon receiving said fire detection message or said fire information message; wherein each of said fire detecting terminals includes a second power controller which is configured to selectively provide an intermittent reception mode of activating said second receiver in a limited reception period alternating with a rest period, and a constant reception mode of constantly keeping said second receiver ready for receiving said fire information message, said second power controller is configured to select the intermittent reception mode until receiving said fire detection message, and select said constant reception mode thereafter to receive said fire information message for establishing said multiple synchronous communication by way of said timeslots, said master station is powered by an incorporated battery, and includes a first power controller configured to selectively provide an intermittent reception mode of activating the first receiver in a limited reception mode alternating with a rest period, and a constant reception mode of constantly keeping said first receiver ready for receiving the fire information message, said first power controller is configured to select the intermittent reception mode until receiving said fire detection message from anyone of said fire detecting terminals, and select said constant reception mode thereafter to transmit said fire information message for starting said multiple synchronous communication with said fire detection terminals.