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Multi-user serial bus system

  • US 4,962,378 A
  • Filed: 11/09/1987
  • Issued: 10/09/1990
  • Est. Priority Date: 11/09/1987
  • Status: Expired due to Fees
First Claim
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1. A digital data communication system for transferring data between a plurality of terminals to a central processor, comprising:

  • a first serial data conductor connected between the central processor and the plurality of terminals for outputting data to the central processor;

    a second serial data conductor connected between the central processor and the plurality of terminals for receiving data from the central processor;

    a clear-to-send control conductor connected from the central processor to the plurality of terminals for enabling a data transfer between the central processor and one of the plurality of terminals;

    request-to-send means for outputting a request-to-send indicator to the central processor enabling the data transfer from the central processor to one of the plurality of terminals;

    means for detecting a not-busy condition of the first and second serial data conductors;

    means responsive to the not-busy detecting means for controlling the outputting of data to the central processor from one of the plurality of terminals via the first serial data conductor on a first-come, first-served basis; and

    delay means for preventing each terminal from initiating a data transfer for a preselected delay period after the cessation of the busy condition to provide the terminal and the central processor a period to respond to the data transfer therebetween.

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