Life safety system having a panel network with message priority
First Claim
1. A life safety system having a message priority comprising:
- a network of panels, each panel including a first module in the form of a central processing unit, and a plurality of local I/O modules connected to the central processing unit and to each other;
means for establishing message priority in communication between said panels, said means including a two-state token form of coded invitations to transmit messages, the first state of the token representing a low priority invitation and the second state of the token representing a high priority invitation;
said means for establishing message priority further including means for passing said tokens continuously between panels to determine if any panel has a high priority message;
wherein a given panel, having a low priority message and holding the token in its first state, recognizes that state of the token and generates the second state of the token representing a high priority invitation, which it then passes on to determine if any other panel has a high priority message to transmit; and
, wherein that other panel having a high priority message preempts communication of messages between panels by first capturing the token which is in the second state and then transmitting its high priority message to an intended panel.
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Accused Products
Abstract
A life safety system having message priority of a network of panels, each panel including a first module in the form of a central processing unit, and a plurality of local I/O modules connected to the central processing unit and to each other. To establish a message priority in communication between the panels, including a two-state token form of coded invitations to transmit messages, the first state of the token represents the low priority invitation and the second state of the token represents the high priority invitation. Moreover, to further establish message priority including the passing of tokens continuously between panels to determine if any panel has the high priority message, that panel having the high priority message preempts communication of such messages between panels by first capturing the high priority state token.
59 Citations
7 Claims
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1. A life safety system having a message priority comprising:
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a network of panels, each panel including a first module in the form of a central processing unit, and a plurality of local I/O modules connected to the central processing unit and to each other; means for establishing message priority in communication between said panels, said means including a two-state token form of coded invitations to transmit messages, the first state of the token representing a low priority invitation and the second state of the token representing a high priority invitation; said means for establishing message priority further including means for passing said tokens continuously between panels to determine if any panel has a high priority message;
wherein a given panel, having a low priority message and holding the token in its first state, recognizes that state of the token and generates the second state of the token representing a high priority invitation, which it then passes on to determine if any other panel has a high priority message to transmit; and
, wherein that other panel having a high priority message preempts communication of messages between panels by first capturing the token which is in the second state and then transmitting its high priority message to an intended panel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification