JPS57135551A - Contention type multidrop connection system - Google Patents

Contention type multidrop connection system

Info

Publication number
JPS57135551A
JPS57135551A JP2095681A JP2095681A JPS57135551A JP S57135551 A JPS57135551 A JP S57135551A JP 2095681 A JP2095681 A JP 2095681A JP 2095681 A JP2095681 A JP 2095681A JP S57135551 A JPS57135551 A JP S57135551A
Authority
JP
Japan
Prior art keywords
terminal
control station
transmission line
circuit
logical value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2095681A
Other languages
Japanese (ja)
Inventor
Toshiaki Atsumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2095681A priority Critical patent/JPS57135551A/en
Publication of JPS57135551A publication Critical patent/JPS57135551A/en
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40Bus networks
    • H04L12/407Bus networks with decentralised control
    • H04L12/413Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD)

Abstract

PURPOSE:To enable contention type communication regarding each terminal by providing a contention circuit which sends a transmission request signal from a data terminal equipment to a transmission line a prescribed delay time after the end of a signal being transmitted from another terminal is detected. CONSTITUTION:A data control station 1, a transmission line 2 for transmission from a terminal side to the control station 1, a transmission line 3 for reception from the control station 1 to the terminal side, a data terminal equipment 5, a contention circuit 4, etc., are provided. When a terminal completes communication, no signal wave being transmitted is present on the transmission line 2, so the output of an A/D converter 6D is held at a ''0'' through a coupling transformer 4A regarding another terminal. After a prescribed delay time, the output logical value C of a timer G goes down to ''0'', the output logical value D of an OR circuit 6F goes up to ''1'', and the output logical value B of an AND circuit 6E goes up to ''1''. At another enqueued terminal, switches 6A and 6B are closed to send a request to the control station 1, performing necessary communication.
JP2095681A 1981-02-17 1981-02-17 Contention type multidrop connection system Granted JPS57135551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2095681A JPS57135551A (en) 1981-02-17 1981-02-17 Contention type multidrop connection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2095681A JPS57135551A (en) 1981-02-17 1981-02-17 Contention type multidrop connection system

Publications (1)

Publication Number Publication Date
JPS57135551A true JPS57135551A (en) 1982-08-21

Family

ID=12041629

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2095681A Granted JPS57135551A (en) 1981-02-17 1981-02-17 Contention type multidrop connection system

Country Status (1)

Country Link
JP (1) JPS57135551A (en)

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