Dynamic message sign display panel communication error detection and correction
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United States of America Patent
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Jul 24, 2007
Grant Date -
Jul 21, 2005
app pub date -
Dec 31, 2003
filing date -
Dec 31, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
In accordance with the invention, there is described a sign display panel made up of a controller connected in a serial communication network with a set of display units. Each of the display units receives messages from the controller and detects errors in the messages. The controller sends a series of communication integrity messages to the set of display units. When a display unit receives the communication integrity message, it sends it to the next display unit or back to the controller. If a display unit does not receive a communication integrity message within a set time interval, the display unit sends an error message that is received by the controller.
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