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System for data communication on automobile

  • US 5,305,355 A
  • Filed: 04/27/1992
  • Issued: 04/19/1994
  • Est. Priority Date: 04/26/1991
  • Status: Expired due to Term
First Claim
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1. A data communication system for use on a motor vehicle, comprising:

  • a communication bus;

    at least one master unit connected to said communication bus; and

    at least one slave unit connected to said communication bus;

    said master unit having connection request demand means for outputting connection request demand data to demand a request for a connection to the communication bus to said slave unit when the master unit is enabled;

    said slave unit having connection request means for transmitting its own connection request information to said master unit in response to said connection request demand data from the master unit if said connection request demand data is received by said slave unit, and for continually transmitting the connection request information to said master unit in each predetermined time period as long as said data communication system is energized if said connection request demand data is not received by said slave unit.

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