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Portable terminal device, external equipment for the same, and method and computer-readable recording medium storing a program thereon for recognizing the external equipment

  • US 20040229648A1
  • Filed: 06/21/2004
  • Published: 11/18/2004
  • Est. Priority Date: 01/16/2002
  • Status: Abandoned Application
First Claim
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1. External equipment adapted to be connected to a portable terminal device via connecting means which includes an upstream signal line that transfers a signal coming into said portable terminal device and a downstream signal line that transfers a signal going out from said portable terminal device, said external equipment comprising:

  • a control unit which is supplied with a predetermined operation voltage and controls communications between said external equipment and said portable terminal device via said upstream and downstream signal lines; and

    a switch unit which short-circuits said downstream signal line and said upstream signal line with no such operation voltage being supplied to said control unit.

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