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Multi-user serial data bus

  • US 4,654,655 A
  • Filed: 03/02/1984
  • Issued: 03/31/1987
  • Est. Priority Date: 03/02/1984
  • Status: Expired due to Term
First Claim
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1. A data communications system, comprising:

  • (a) a serial data bus including at least first and second conductors;

    (b) a plurality of peripheral units each having a multi-bit pre-assigned address indicative of a pre-assigned priority and including means coupled to said serial data bus for placing a first bit of its pre-assigned address on said first conductor and the remaining bits of its pre-assigned address on said first conductor in response to clocking information on said second conductor, means for detecting addresses placed on said first conductor, and means for releasing said first conductor in response to detection of an address having a having priority than its pre-assigned address; and

    (c) a bus control unit coupled to said serial data bus for detecting peripheral unit addresses placed on said first conductor and placing the clocking information on said second conductor in response thereto.

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