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System and method for distinguishing a device failure from an inter-device communication failure

  • US 6,351,829 B1
  • Filed: 10/28/1998
  • Issued: 02/26/2002
  • Est. Priority Date: 10/28/1998
  • Status: Expired due to Term
First Claim
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1. For use in a control system containing first and second devices coupled together for inter-device communication, a circuit for distinguishing a failure of said first device from a failure of said inter-device communication, comprising:

  • a device failure signal generator, associated with and separately powered from said first device, that communicates a device failure signal to said second device upon occurrence of a predetermined condition; and

    a device failure signal detector, associated with said second device, that detects said device failure signal, detection of said device failure signal contraindicating a failure of said inter-device communication.

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