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Scan tool with dropped communications detection and recovery and improved protocol selection

  • US 6,928,349 B1
  • Filed: 10/01/2003
  • Issued: 08/09/2005
  • Est. Priority Date: 06/01/2001
  • Status: Active Grant
First Claim
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1. A method of operating an off-board device to communicate with a diagnostic system of a vehicle, the diagnostic system having one or more modules, comprising the steps of:

  • (a) determining a number of pieces of information received from one or more modules using a first communications protocol;

    (b) determining a number of pieces of information received from the one or more modules using a second communications protocol; and

    (c) selecting from the plurality of communications protocols a communications protocol to use for communications between the off-board device and the diagnostic system using at least the number of pieces of information received from the one or more modules using the first communications protocol and the number of pieces of information received from the one or more modules using the second communications protocol.

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