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Multiple access data communication system

  • US 4,539,677 A
  • Filed: 07/28/1983
  • Issued: 09/03/1985
  • Est. Priority Date: 07/28/1983
  • Status: Expired due to Fees
First Claim
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1. A method of transmitting multi-byte information messages between transceivers linked in a multiple access mode to a common bus, each transceiver interfacing between the bus and a respective user device, each device containing a general purpose computer adapted for multiple applications, comprising:

  • transmitting digital signals representing a said message from any one of said user devices through a respective one of said transceivers to said bus, said signals being arranged in a bit-serial asynchronous baseband form, said signals containing groups of first signals representing information bytes, each such byte group preceded by a respective group of second signals defining the beginning of the respective byte group, each said second group consisting of paired stop and start signal elements;

    the stop and start elements in each pair having different amplitude levels providing a transition on said bus which forms a time reference for reception of the bits in the following byte group;

    receiving and temporarily storing said byte groups one at a time at transceivers connected to other said user devices; and

    timing durations of stop signals in said second groups to allow sufficient time between receptions of consecutive byte groups at said other devices to permit respective computers of said other devices to be interrupted and perform real time processing operations relative to each received byte group while a next byte group is being received, as required for handling reception of the respective message.

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