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Information transmission system having collective data transmission and collection devices

  • US 4,998,245 A
  • Filed: 12/12/1988
  • Issued: 03/05/1991
  • Est. Priority Date: 12/17/1987
  • Status: Expired due to Term
First Claim
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1. A communication control method in a bus type communication network having a plurality of communication control units connected to an information transmission path wherein a selected one of said communication control units collectively collects broadcasting information from other ones of said plurality of communication control units through said information transmission path, comprising the steps of:

  • (a) transmitting, from said selected communication control unit which collects the broadcasting information, a memory address designation message to said information transmission path,said memory address designation message having a destination address in the message, a control field containing a specific code and a data field containing a code indicating a memory address of data to be collected,said code in said control field indicating an attribute of the message,said data field containing data to be transmitted;

    (b) receiving, by all said communication control units except said selected communication control unit which collects the broadcasting information, said memory address designation message is to be collected;

    (c) transmitting from said selected communication control unit, which collects the broadcasting information, an information collection message to said information transmission path,said information collection message having a destination address in the message, a control field containing a specific code, and a data field containing a plurality of sets each comprising an address data field and a send-back information field,said send-back information field containing the information data to be sent back;

    (d) transmitting from said communication control units, which have received said information collection message, unit address data of their own communication control units to said address data field in said information collection message to perform competition control, and preparing, in said communication control units which have won in the competition control, said address data field by using the unit address data of their own communication control units, and preparing said send-back information field by using the send-back information designated by said memory address designation message, and sequentially transmitting from each of said communication control units a set of said address data field and said send-back information field to said information transmission path; and

    (e) receiving by said selected communication control unit, which has transmitted said information collection message, said address data field and said send-back information field so that said selected communication control unit collectively collects the broadcasting information from said other communication control units by using one message,whereby the broadcasting information is collectively collected.

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