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Multiplex transmission apparatus and multiplex transmission method

  • US 5,398,240 A
  • Filed: 12/24/1992
  • Issued: 03/14/1995
  • Est. Priority Date: 12/26/1991
  • Status: Expired due to Term
First Claim
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1. A multiplex transmission apparatus in which a plurality of control units separately connected to a common multiplex transmission path perform transmission/reception of information with each other, comprising:

  • transmission data storage means for storing transmission data to be transmitted from each of said control units onto said multiplex transmission path;

    reception data storage means for storing reception data transmitted by each of said control units via said multiplex transmission path;

    means for setting a flag for indicating a state that the transmission data is being stored in said transmission data storage means and waiting to be transmitted; and

    means for resetting the flag for indicating a state that the transmission data has been transmitted from said transmission data storage means onto said multiplex transmission path;

    wherein each of said control units reads out the flag together with the reception data stored in said reception data storage means and determines that the reception data is not response data to the transmission data when said reception data storage means stores the reception data while the flag is set, or determines that the reception data is response data to the transmission data when said reception data storage means stores the reception data while the flag is reset.

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