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Open-loop monitoring system

  • US 20100052874A1
  • Filed: 08/25/2009
  • Published: 03/04/2010
  • Est. Priority Date: 09/01/2008
  • Status: Abandoned Application
First Claim
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1. An open-loop monitoring system comprising:

  • a host device; and

    a plurality of monitoring devices coupled to said host device through a single transmission line such that said host device, said monitoring devices and said transmission line constitute an open-loop structure;

    wherein said host device has a coupling end coupled to one end of said transmission line, and includes a signal generating unit coupled to said coupling end, operable to generate encoded signals and outputting the encoded signals through said coupling end to said transmission line;

    each of said monitoring devices includinga control unit coupled to said transmission line for receiving the encoded signals therefrom, identifying a monitoring signal from the encoded signals received thereby, and outputting the monitoring signal, anda detecting unit includinga detector adapted to be coupled to a plurality of first electronic devices, coupled to said control unit for receiving the monitoring signal therefrom, detecting, in response to the monitoring signal received thereby, whether each of the first electronic devices is activated or deactivated, generating a detecting output associated with states of the first electronic devices based on a detection result made thereby, anda first modulator coupled to said detector and said transmission line, receiving the detecting output from said detector, modulating the detecting output received thereby so as to generate a reply signal that is in the form of carrier waves, and transmitting the reply signal to said coupling end of said host device through said transmission line; and

    said host device further including a processing unit that includesa demodulator coupled to said coupling end for receiving and demodulating the reply signal from each of said monitoring devices, and outputting the reply signal demodulated thereby, anda processor coupled to said demodulator, receiving the reply signal from said demodulator and obtaining state information corresponding to the reply signal from each of said monitoring devices, said processor determining whether said transmission line is cut off based on the reply signals demodulated by said demodulator, and obtaining condition information indicating a section of said transmission line that is discontinuous by analyzing the reply signals when said transmission line is determined to be cut off.

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