Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 21, 2009
Patent Application Number
10912125
Date Filed
August 6, 2004
Patent Primary Examiner
Patent abstract
A main control apparatus is connected to a single signal line. A plurality of equipments is respectively connected to a multipoint line. Each multipoint line diverges from the single signal line. The main control apparatus sends a control signal to each equipment through the single signal line using a frequency band. Each equipment receives the control signal from the main control apparatus through the multipoint line using the frequency band. Each equipment is assigned a unique frequency from within the frequency band.
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