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Method of controlling message transmission sequence in multi station communication system

  • US 4,445,214 A
  • Filed: 04/22/1982
  • Issued: 04/24/1984
  • Est. Priority Date: 05/30/1980
  • Status: Expired due to Term
First Claim
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1. A method of controlling the sequence of message transmission between processor-controlled stations in a communication system, where each message includes a header having at least a sequence bit indicating first and second binary states and an acknowledge bit and wherein the message may or may not be a data message, the steps comprisingstoring in memory at each station a transmit sequence bit and a receive sequence bit;

  • inserting into the header of each message transmitted from a given station a sequence bit having the state of the transmit sequence bit stored at that station;

    switching the state of the stored transmit sequence bit at a station upon receipt of a message having an acknowledge bit;

    switching the state of the stored receive sequence bit at a station upon receipt of a data message having a sequence bit whose state corresponds to that of the stored receive sequence bit at that station and returning a message having an acknowledge bit;

    retransmitting from a given station a message previously transmitted from that station when a message having an acknowledge bit is not received from the receiving station in a predetermined time after initial transmission; and

    disregarding a message received at a station when the state of the sequence bit in the message is different from the state of the receive sequence bit stored at that station.

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