Method and apparatus implementing a communication protocol for use in a control system
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United States of America Patent
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Aug 9, 2005
Grant Date -
May 6, 2004
app pub date -
Dec 20, 2002
filing date -
Oct 31, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A remote control unit for controlling a locomotive by transmitting signals to a remote receiver mounted onboard the locomotive is provided. The remote control unit includes an input for receiving a signal indicative of a command selected from a set of available commands. A signal transmitting unit transmits a signal indicative of the selected command repetitively to create a succession of signal transmission events. In a first example, each signal transmission event is spaced in time from a previous signal transmission event by a certain time interval having a duration conditioned at least in part on the basis of the selected command. In a second example, each signal transmission event includes a message portion and a header portion and the message portion of the signal has a length conditioned at least in part on the basis of the selected command. In a third example, each signal transmission event is characterized by a signal level conditioned at least in part on the basis of the selected command. The signal transmitting unit includes an RF modulator adapted for modulating data indicative of the selected command to generate a succession of modulated signals, each modulated signal corresponding to a respective signal transmission event in the succession of signal transmission events.
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