JPS56107661A - Data transmission control system of multidrop system - Google Patents

Data transmission control system of multidrop system

Info

Publication number
JPS56107661A
JPS56107661A JP975380A JP975380A JPS56107661A JP S56107661 A JPS56107661 A JP S56107661A JP 975380 A JP975380 A JP 975380A JP 975380 A JP975380 A JP 975380A JP S56107661 A JPS56107661 A JP S56107661A
Authority
JP
Japan
Prior art keywords
data
polling
machine
master machine
selecting
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.)
Pending
Application number
JP975380A
Other languages
Japanese (ja)
Inventor
Hiroaki Fukuoka
Tsutomu Yamaguchi
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.)
Shinko Electric Co Ltd
Original Assignee
Shinko Electric Co 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 Shinko Electric Co Ltd filed Critical Shinko Electric Co Ltd
Priority to JP975380A priority Critical patent/JPS56107661A/en
Publication of JPS56107661A publication Critical patent/JPS56107661A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling

Abstract

PURPOSE:To improve the operation efficiency of the master machine, by executing in order polling/selecting to plural data terminal equipments and stopping the polling/selecting when a data terminal equipment has been selected, in the data processing equipment. CONSTITUTION:In case when the third slave machine 3 transmits a data to the master machine M, it detects by the first receiver R1 and the second receiver R2 that the signal level is not varied in the transmission lines A and B for a prescribed period of time, and also transmits some data to the master machine M through the transmission line B. When the master machine M has recognized said data, it executes the polling/selecting in order. And, when the third slave machine has been selected, this polling/selecding operation is halted. Subsequently, a data link is firmly established between the master machine M and the third slave machine.
JP975380A 1980-01-30 1980-01-30 Data transmission control system of multidrop system Pending JPS56107661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP975380A JPS56107661A (en) 1980-01-30 1980-01-30 Data transmission control system of multidrop system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP975380A JPS56107661A (en) 1980-01-30 1980-01-30 Data transmission control system of multidrop system

Publications (1)

Publication Number Publication Date
JPS56107661A true JPS56107661A (en) 1981-08-26

Family

ID=11729045

Family Applications (1)

Application Number Title Priority Date Filing Date
JP975380A Pending JPS56107661A (en) 1980-01-30 1980-01-30 Data transmission control system of multidrop system

Country Status (1)

Country Link
JP (1) JPS56107661A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS556918A (en) * 1978-06-30 1980-01-18 Toshiba Corp Polling control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS556918A (en) * 1978-06-30 1980-01-18 Toshiba Corp Polling control system

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