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Data transmission system

  • US 5,224,124 A
  • Filed: 01/28/1991
  • Issued: 06/29/1993
  • Est. Priority Date: 06/16/1983
  • Status: Expired due to Fees
First Claim
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1. A central control unit in a data transmission system for an automobile, comprising:

  • a data processing unit;

    at least one local control unit connected to one or more input/output devices of the automobile; and

    a communication control unit connected to said data processing unit and including means for performing data transmission in a half duplex mode on a transmission medium with said local control unit;

    said communication control unit having first means for receiving a frame of data from said local control unit via said transmission medium and for counting the data as it is received, second means connected to said first means for detecting an error in the received frame of data and for outputting a data process requesting signal only when reception the count of received data indicates that of a full frame of data has been completed and there is no error in the received data, and third means for applying an interruption request signal to said data processing unit in response to said data process requesting signal being outputted by said second means, wherein said communication control unit includes means for cancelling an operation for receiving a frame of data when an error is detected in the frame of data by said error detecting means so that said communication control unit is made ready for receiving another frame of data; and

    said data processing unit including means for processing received data in response to the interrupt request signal from said communication control unit.

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