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Interface module with protection circuit and method of protecting an interface

  • US 6,167,321 A
  • Filed: 06/25/1998
  • Issued: 12/26/2000
  • Est. Priority Date: 06/25/1998
  • Status: Expired due to Term
First Claim
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1. An interface module for a communications system comprising a processing device and a peripheral device which are interconnected through a communications bus having a plurality of data lines, said interface module comprising:

  • a transceiver interface; and

    a protection circuit, said protection circuit substantially positioned between said transceiver interface and a port configured to receive a data signal from a terminal of said communications bus, and configured to automatically provide a protection voltage to the transceiver interface if a power supply for the transceiver interface is inactive, said protection voltage being derived from said data signal received at said terminal.

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