Methods and system for collecting information on operating state
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United States of America Patent
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N/A
Issued Date -
Jun 20, 2002
app pub date -
Oct 26, 2001
filing date -
Oct 26, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a method and a system for collecting information on the operating state from several devices connected in parallel to the same electric circuit, e.g. from safety lights connected to the same array of safety lights, each of the devices being provided with members for receiving an enquiry about the operating state of the device via the electric circuit from a testing unit and for sending a message indicating the information on the operating state to the testing unit via the electric circuit in response to the enquiry sent from the testing unit. According to the invention, the method comprises steps where the testing unit sends a common enquiry about the operating state of the devices to all members arranged in connection with said devices as at least one pulse-like change in the voltage supplied to the devices via the electric circuit, and the members send their response to the testing unit as a current pulse after a period specific to each device from the pulse change in the supply voltage.
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