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DATA TRANSMISSION METHOD AND SERIAL LOOP DATA TRANSMISSION SYSTEM

  • US 3,633,166 A
  • Filed: 05/05/1970
  • Issued: 01/04/1972
  • Est. Priority Date: 05/16/1969
  • Status: Expired due to Term
First Claim
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1. A method for establishing communications between a central station and a plurality of remote stations connected in a serial loop with said central station comprising the steps of:

  • transmitting from said central station, characters having a first predetermined bit configuration followed by at least one character of a second predetermined bit configuration and immediately followed by characters having said first predetermined bit configuration;

    at each said remote station monitoring the bit configurations on the loop for detecting the presence of said second predetermined bit configuration;

    inserting a unique bit configuration identifying the remote station following the detection of said second predetermined bit configuration when the station has data to send to the central;

    buffering a predetermined number of incoming bits from the loop before passing the buffered bits onto the next remote station on the loop;

    monitoring the buffered bits to detect the said first predetermined bit configuration; and

    passing the received bit stream directly onto the next remote station in the loop when the said first predetermined bit configuration is detected amongst the buffered bits whereby said central station receives from the lAst station in the loop a plurality of unique bit configurations, each identifying one remote station which has data to send to the central and requires service which may be initiated by the central in any order which is appropriate since the central is advised of all remote stations requiring service.

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