Alarm system having improved communication
First Claim
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1. A method for communication in a fire alarm system, comprising:
- sending, on a pair of power lines, a message to a notification appliance, the notification appliance alerting a person during a fire alarm condition;
at said notification appliance, responding to the message; and
in a standby mode, supplying power to the notification appliance at a first voltage level to provide only enough power to support two-way communications between a system controller and said notification appliance.
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Abstract
In a fire alarm system, a message is sent on a pair of power lines to a notification appliance. The notification appliance responds to the message by activating one or more of its notification devices. In a standby mode, only enough power is supplied to the plural notification appliances, at a first voltage level, to support two-way communications between a system controller and the notification appliances. In an active mode, power is supplied at a second voltage sufficient to operate audible and visible alarms of the notification appliance.
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Citations
21 Claims
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1. A method for communication in a fire alarm system, comprising:
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sending, on a pair of power lines, a message to a notification appliance, the notification appliance alerting a person during a fire alarm condition; at said notification appliance, responding to the message; and in a standby mode, supplying power to the notification appliance at a first voltage level to provide only enough power to support two-way communications between a system controller and said notification appliance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A notification appliance for use in an alarm system, comprising:
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at least one notification device that alerts a person during a fire alarm condition; an electronic circuit that receives messages over a pair of power lines, the notification appliance being responsive to the received messages; and said notification appliances, in a standby mode, being powered at a first voltage level that provides only enough power to support two-way communications between a system controller and said notification appliance. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A fire alarm system, comprising:
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a system controller which sends, on a pair of power lines, a message to at least one notification appliance, the at least one notification appliance alerting a person during a fire alarm condition, the system controller, in a standby mode, supplying power to the notification appliance at a first voltage level to provide only enough power to support two-way communications between a system controller and said notification appliance; the at least one notification appliance, which receives and is responsive to the message. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A fire alarm system, comprising:
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means for sending, on a pair of power lines, a message to a notification appliance, the notification appliance alerting a person during a fire alarm condition; means for responding, at said notification appliance, to the message; and means for supplying power in a standby mode to the notification appliance at a first voltage level to provide only enough power to support two-way communications between a system controller and said notification appliance.
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Specification