JPS55110451A - Data transmission unit - Google Patents

Data transmission unit

Info

Publication number
JPS55110451A
JPS55110451A JP1750979A JP1750979A JPS55110451A JP S55110451 A JPS55110451 A JP S55110451A JP 1750979 A JP1750979 A JP 1750979A JP 1750979 A JP1750979 A JP 1750979A JP S55110451 A JPS55110451 A JP S55110451A
Authority
JP
Japan
Prior art keywords
line
circuit
units
data transmission
predetermined 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.)
Pending
Application number
JP1750979A
Other languages
Japanese (ja)
Inventor
Akira Watanabe
Masayuki Eguchi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1750979A priority Critical patent/JPS55110451A/en
Publication of JPS55110451A publication Critical patent/JPS55110451A/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

Landscapes

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

Abstract

PURPOSE:To increase the data transmission efficiency without useless time which had been required for the determination of the unit after data transmission, by adding a simple circuit to a plurality of station units connected to common data line. CONSTITUTION:The station units A-D are connected in tree shape to the common data line 3, and the open collector type polling line 2 connected to the clock generation circuit 4 is connected to the units A-D. The special signal on the line 2 sets the initial value on the units A-D, and the conversion point of the clock signal is counted at the counter circuit 5. When the count value of the line 5 is predetermined value, the data line vacancy detection circuit 7 detects the vacancy on the data line 3, and when the request is made from the computer K, the start of transmission is instructed from the first AND circuit 6. Further, when the line 3 is in use, the circuit 5 is a predetermined value, and when the request is made, the second AND circuit 12 fixes the signal on the line 2 to the predetermined value to avoid useless time.
JP1750979A 1979-02-16 1979-02-16 Data transmission unit Pending JPS55110451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1750979A JPS55110451A (en) 1979-02-16 1979-02-16 Data transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1750979A JPS55110451A (en) 1979-02-16 1979-02-16 Data transmission unit

Publications (1)

Publication Number Publication Date
JPS55110451A true JPS55110451A (en) 1980-08-25

Family

ID=11945938

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1750979A Pending JPS55110451A (en) 1979-02-16 1979-02-16 Data transmission unit

Country Status (1)

Country Link
JP (1) JPS55110451A (en)

Similar Documents

Publication Publication Date Title
JPS5549729A (en) Data transfer system
JPS53113401A (en) Light communication system
JPS5326539A (en) Data exchenge system
JPS56140451A (en) Log information holding device
AU510240B2 (en) Common polling logic for input/output interrupt or cycle steal data transfer requests
JPS5230119A (en) Bar code discrimination logical circuit
JPS55110451A (en) Data transmission unit
JPS5337344A (en) Data collecting system
JPS5563426A (en) Data collection and processing system by loop line
JPS55110450A (en) Data transmission unit
JPS5336120A (en) Information transfer system
JPS5394143A (en) High-speed data transmission-reception system
JPS5363833A (en) Cyclic buffer receiving system
JPS52154319A (en) Data transmission unit
JPS52115647A (en) Information multiple retrieval system
JPS53120550A (en) Plant monitoring apparatus
JPS55162144A (en) Assigning circuit for number of digits of transmitted data
JPS5523643A (en) Data transmission system
JPS5525292A (en) Data reception device
ES8103407A1 (en) Data processing system
JPS5620362A (en) Error information system
JPS5576457A (en) Evaluation data collecting device for computer system performance
JPS52106242A (en) Character multiple communication system
JPS53138249A (en) Send-back system for check signal
JPS53127250A (en) Data collection system