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JPS5671353A - Multidrop data communication system - Google Patents

Multidrop data communication system

Info

Publication number
JPS5671353A
JPS5671353A JP14731579A JP14731579A JPS5671353A JP S5671353 A JPS5671353 A JP S5671353A JP 14731579 A JP14731579 A JP 14731579A JP 14731579 A JP14731579 A JP 14731579A JP S5671353 A JPS5671353 A JP S5671353A
Authority
JP
Japan
Prior art keywords
terminal
selected sequence
control
communication system
transmission
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
JP14731579A
Other languages
Japanese (ja)
Other versions
JPS58218B2 (en
Inventor
Harumichi Sato
Sanai Hamaguchi
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 JP54147315A priority Critical patent/JPS58218B2/en
Publication of JPS5671353A publication Critical patent/JPS5671353A/en
Publication of JPS58218B2 publication Critical patent/JPS58218B2/en
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To enable to reduce the amount of signal transfer, by the transmission of selected sequence only from a single slave station located nearest the control station side to establish the data link, in a multidrop data communication system of contention system. CONSTITUTION:When data transfer request is produced at slave stations 112, 113... 11n, the terminal (c) of respective selector switches 152, 153...15n is switched from the terminal (b) to the terminal (a). Further, when no character sequence is transferred to transmission line 12 and reception line 13, a control station 14 outputs the control signal of ''L'' to a control 17. Further, the terminal (c) of the switch 15 is connected to the terminal (a) to hold ''H'', then the slave stations 113...11n transmit no selected sequence. Moreover, although the terminal (b) of the switch 151 is at ''L'', an AND circuit (not shown) has no AND condition, and the slave station 111 does not transmit the selected sequence. Accordingly, the reduction in the amount of signal transfer can be made by establishing the data link through the transmission of selected sequence by the slave station 112.
JP54147315A 1979-11-14 1979-11-14 Multi-drop data communication method Expired JPS58218B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54147315A JPS58218B2 (en) 1979-11-14 1979-11-14 Multi-drop data communication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54147315A JPS58218B2 (en) 1979-11-14 1979-11-14 Multi-drop data communication method

Publications (2)

Publication Number Publication Date
JPS5671353A true JPS5671353A (en) 1981-06-13
JPS58218B2 JPS58218B2 (en) 1983-01-05

Family

ID=15427404

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54147315A Expired JPS58218B2 (en) 1979-11-14 1979-11-14 Multi-drop data communication method

Country Status (1)

Country Link
JP (1) JPS58218B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52104803A (en) * 1976-02-28 1977-09-02 Shimadzu Corp Data transmission sequence control device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52104803A (en) * 1976-02-28 1977-09-02 Shimadzu Corp Data transmission sequence control device

Also Published As

Publication number Publication date
JPS58218B2 (en) 1983-01-05

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