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Monitoring system for remote devices

  • US 5,410,590 A
  • Filed: 02/18/1992
  • Issued: 04/25/1995
  • Est. Priority Date: 02/18/1992
  • Status: Expired due to Term
First Claim
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1. An apparatus for auditing the usage of a device and communicating the status of the audited device to a central computer via a telecommunications line, comprising:

  • (a) a power supply connected to the telecommunications line;

    (b) a microcontroller including memory means, said microcontroller being connected to said power supply;

    (c) means to receive and transmit data signals, comprising a receiver and a transmitter, said means to receive and transmit data signals being connected to said microcontroller and to the telecommunications line;

    (d) means to detect voltage levels input via the telecommunications line which are a function of the operation of the audited device, said means to detect being connected to said microcontroller;

    (e) program logic means residing in said microcontroller, for receiving data signals and voltage levels pertaining to the operation of the audited device and reporting the status of the audited device to the central computer at a predetermined time, said program logic means periodically disrupting power usage by the apparatus; and

    (f) clock control means connected to said micro controller and to said means to receive and transmit data signals, wherein said receiver alternately strobes a plurality of said data signals to detect differing frequencies simultaneously in said data signals.

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