Frequency communications scheme in life safety devices

G - Physics – 08 – B

Patent

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Details

G08B 29/00 (2006.01) G08B 7/06 (2006.01) G08C 17/02 (2006.01)

Patent

CA 2584463

A method of radio frequency communication for a life safety device including a controller, a hazardous condition sensor, an alarm device, and a radio frequency communications device including transmitting and receiving capability. One method includes receiving a test signal using the radio frequency communications device, lowering a voltage to the hazardous condition sensor to simulate a hazardous condition to test the hazardous condition sensor, and emitting an alarm using the alarm device if the hazardous condition sensor passes the test. Another method includes before transmitting a radio frequency signal, turning on the radio frequency communications device for a period of time, and delaying transmission if the radio frequency communications device receives a header, deadtime and startbit. Yet another method includes sending a test signal at a first transmission power level, and sending an alarm signal at a second transmission power level greater than the first transmission power level.

L'invention concerne un procédé de communication radiofréquence destiné à un dispositif de sécurité des personnes comprenant un contrôleur, un capteur de situation dangereuse, un dispositif d'alarme et un dispositif de communications radiofréquence doté d'une capacité de transmission et de réception. Un procédé consiste à recevoir un signal d'essai à l'aide du dispositif de communications radiofréquence, à abaisser une tension sur le capteur de situation dangereuse afin de simuler une situation dangereuse et de soumettre ledit capteur à un essai, et à émettre une alarme à l'aide du dispositif d'alarme lorsque le capteur de situation dangereuse est soumis à l'essai. Un autre procédé consiste, avant de transmettre un signal radiofréquence, à éteindre le dispositif de communications radiofréquence pendant un certain temps, et à retarder la transmission lorsque ledit dispositif de communications radiofréquence reçoit un en-tête, un temps mort et un bit de départ. Un dernier procédé consiste à envoyer un signal d'essai à un premier niveau de puissance de transmission et à envoyer un signal d'alarme à un second niveau de puissance de transmission plus élevé que le premier.

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