Security system
First Claim
1. A security system comprising:
- a plurality of security units; and
a plurality of control units connected to said plurality of security units through a communication line including a transmission line;
each of control units including;
information transmitting means for transmitting a command including control data and address data to at least one of said security units through said transmission line in response to a transmission request;
data collision detection means for detecting data collision on said transmission line, wherein said information transmitting means postpones transmission of said command when said collision detection means detects data collision on said transmission line;
re-transmission interval setting means for setting a different interval for each of said control units; and
information transmitting means for re-transmitting said command after the elapse of said different interval set by said retransmission interval setting means from the detection of said data collision.
1 Assignment
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Accused Products
Abstract
Plural security units are coupled to plural control units through a communication line including transmission and response lines. Each control unit detects data collision on the transmission line to avoid the data collision. Re-transmission interval is independently assigned to each control unit. If the command to or from a security unit in charge of this control unit is received, the control unit rewrites the conditional data of the security unit in accordance with the detected command. The control (security) unit further includes a transmission (response) line monitoring portion, so that bi-directional communication is provided in addition of the response (transmission) line monitoring portion. Address data is classified to provide all unit communication, a group communication, and independent communications.
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Citations
7 Claims
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1. A security system comprising:
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a plurality of security units; and
a plurality of control units connected to said plurality of security units through a communication line including a transmission line;
each of control units including;
information transmitting means for transmitting a command including control data and address data to at least one of said security units through said transmission line in response to a transmission request;
data collision detection means for detecting data collision on said transmission line, wherein said information transmitting means postpones transmission of said command when said collision detection means detects data collision on said transmission line;
re-transmission interval setting means for setting a different interval for each of said control units; and
information transmitting means for re-transmitting said command after the elapse of said different interval set by said retransmission interval setting means from the detection of said data collision. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification