Security system

Details Security system Security system

2005-01-04

2005-01-04

Horabik, Michael (Department: 2635)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S506000, C340S522000, C340S005800, C340S538000, C340S288000, C340S286020

Reexamination Certificate

active

06838974

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.

REFERENCES:
patent: 4543574 (1985-09-01), Takagi et al.
patent: 4721954 (1988-01-01), Mauch
patent: 5809027 (1998-09-01), Kim et al.
patent: 6483847 (2002-11-01), Ross
patent: 8-305610 (1996-11-01), None

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