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Process for information transmission in a bus system having several participants

  • US 5,982,781 A
  • Filed: 12/09/1993
  • Issued: 11/09/1999
  • Est. Priority Date: 07/04/1991
  • Status: Expired due to Term
First Claim
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1. Process for serially transmitting information entities over a serial bus between a plurality of subscribers (ECU1 to ECU4) connected to said serial bus at a common transmission rate for all of said subscribers, each of said subscribers transmitting said information entities at said common transmission rate, said process comprising the steps of:

  • a) providing each of said information entities with a start bit (Sta), said start bit (Sta) being transmitted on said serial bus at a beginning of transmission of each of said information entities;

    b) prior to transmitting said information entities on said serial bus each of said subscribers transmitting said information entities waits a predetermined bus monitoring time period prior to said transmitting;

    c) setting a flag after one of said subscribers (ECU1 to ECU4) receives one of said information entities, said flag being set indicating receipt of said information entity by said subscriber;

    d) monitoring a logic state of said serial bus with each of said subscribers during said bus monitoring time period (TU) thereof at a monitoring rate sufficiently high so that receipt of one of said information entities is immediately detected during receipt of said start bit (Sta) of said information entity so detected, said start bit (Sta) being transmitted at said common transmission rate;

    e) each of said subscribers (ECU1 to ECU4) determining a state of said flag after expiration of said bus monitoring time period (TU) for said subscriber determining said state of said flag; and

    f) only transmitting said information entities from one of said subscribers if said subscriber does not detect that said flag is set during said bus monitoring time period (TU) of said subscriber.

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