Wireless fire alarm system
First Claim
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:
- a first receiver configured to receive a fire detection message from any one of said fire detecting terminals;
a first information generator configured to generate a fire information message after receiving said fire detection message from any one of said fire detecting terminals, said fire information message being configured to define a time reference with regard to a series of timeslots each assigned to receive a reply message from each of said fire detecting terminals and to start a multiple synchronous communication with each of said fire detecting terminals by way of said timeslots;
a first transmitter configured to transmit said fire information message to each of said fire detecting terminals;
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;
whereineach 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.
2 Assignments
0 Petitions
Accused Products
Abstract
A power saving wireless fire alarm system has a master station and a plurality of battery-powered fire detecting terminals linked for wireless communication with each other. Upon detection of a fire occurrence at one of the fire detecting terminals, the fire detecting terminal transmit a fire detection message to a master station which in turn transmit a wake-up message to the other fire detecting terminals and thereafter a fire information message which starts a multiple synchronous communication between the master station and the fire detecting terminals. Each fire detecting terminal has a power controller which selects an intermittent reception mode of activating its own receiver only intermittently until receiving the wake-up message or information indicative of the fire occurrence, and select a constant operation mode thereafter to make the fire detecting terminals be ready for the multiple synchronous communication commenced by the fire information message from the master station.
13 Citations
19 Claims
-
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: -
a first receiver configured to receive a fire detection message from any one of said fire detecting terminals; a first information generator configured to generate a fire information message after receiving said fire detection message from any one of said fire detecting terminals, said fire information message being configured to define a time reference with regard to a series of timeslots each assigned to receive a reply message from each of said fire detecting terminals and to start a multiple synchronous communication with each of said fire detecting terminals by way of said timeslots; a first transmitter configured to transmit said fire information message to each of said fire detecting terminals; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. 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: -
a first receiver configured to receive a fire detection message from any one of said fire detecting terminals; a first information generator configured to generate a wake-up message and a fire information message after receiving said fire detection message from any one of said fire detecting terminals, said wake-up message being configured to be destined for all of said fire detecting terminals, said fire information message being configured to include a statement defining (provide) a series of timeslots each assigned to receive a response from each of said fire detecting terminals and to start a multiple synchronous communication (time division multiple access) with each of said fire detecting terminals by way of said timeslots; a first transmitter configured to transmit said wake-up message first for a predetermined period for a predetermined period in response to said fire detection message and subsequently transmit said fire information message to each of said fire detecting terminals; 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 occurrence of said fire condition; a second transmitter configured to transmit said fire detection message; a second receiver configured to receive said wake-up message and said fire information message; an alarm device configured to issue a fire alarm upon receiving said fire detection message or said wake-up 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 wake-up 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.
-
Specification