JPS57204648A - Input and output device of optical data - Google Patents

Input and output device of optical data

Info

Publication number
JPS57204648A
JPS57204648A JP56089597A JP8959781A JPS57204648A JP S57204648 A JPS57204648 A JP S57204648A JP 56089597 A JP56089597 A JP 56089597A JP 8959781 A JP8959781 A JP 8959781A JP S57204648 A JPS57204648 A JP S57204648A
Authority
JP
Japan
Prior art keywords
pulse
station
high level
duration
central processor
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
JP56089597A
Other languages
Japanese (ja)
Inventor
Mitsuo Matsumoto
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56089597A priority Critical patent/JPS57204648A/en
Publication of JPS57204648A publication Critical patent/JPS57204648A/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]
    • H04L12/42—Loop networks
    • H04L12/423—Loop networks with centralised control, e.g. polling

Landscapes

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

Abstract

PURPOSE:To store the output given from a central processor at a slave station and at the same time transmitting the data of the slave stations to the central processor, by securing a loop-shape connection between a central processor and plural slave stations. CONSTITUTION:A central processor 1 is connected in a loop shape with the slave stations 4(1), 4(2)-4(n) which are set at n-units of plant input/output points via the optical fibers 7(1), 7(2)-7(n). The processor 1 transmits at the first stage of a frame period a pulse train comprising a pulse of a large duration and high level and a pulse having a low level and showing 1 or 0 according to the duration of the pulse. The station 4(1) reduces the level of the first pulse of a high level and a large duration and the discriminates the duration of the subsequent pulse which is allotted to own station to store 1 or 0. At the same time, the station 4(1) sets a high level and decides the duration of the pulse in accordance with the data on the own station and transmits the subsequent pulses as they are. The following slave station changes a high level to a low level of the pulse and transmits and receives the data by the following pulse of the own station to set the final pulse of the own pulse at a high level.
JP56089597A 1981-06-12 1981-06-12 Input and output device of optical data Pending JPS57204648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56089597A JPS57204648A (en) 1981-06-12 1981-06-12 Input and output device of optical data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56089597A JPS57204648A (en) 1981-06-12 1981-06-12 Input and output device of optical data

Publications (1)

Publication Number Publication Date
JPS57204648A true JPS57204648A (en) 1982-12-15

Family

ID=13975175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56089597A Pending JPS57204648A (en) 1981-06-12 1981-06-12 Input and output device of optical data

Country Status (1)

Country Link
JP (1) JPS57204648A (en)

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