JPS5640345A - Data communication system - Google Patents

Data communication system

Info

Publication number
JPS5640345A
JPS5640345A JP11588279A JP11588279A JPS5640345A JP S5640345 A JPS5640345 A JP S5640345A JP 11588279 A JP11588279 A JP 11588279A JP 11588279 A JP11588279 A JP 11588279A JP S5640345 A JPS5640345 A JP S5640345A
Authority
JP
Japan
Prior art keywords
transmission
enable
receiving part
data
signal
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
JP11588279A
Other languages
Japanese (ja)
Inventor
Takao Oka
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 JP11588279A priority Critical patent/JPS5640345A/en
Publication of JPS5640345A publication Critical patent/JPS5640345A/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

Abstract

PURPOSE:To shorten the time required for polling to improve the use efficiency of the communication line, by connecting the central unit and terminal units into a loop by the control line and by arranging them so that the transmission-enable-signal may pass through them in order of the priority level in data communication. CONSTITUTION:Transmission-enable-control parts of terminal units 12a-12d are branched and connected to data transmission and receiving line 13, which is connected to data transmission and receiving part 15 of central unit 11, through the branching line. Central unit 11 and terminal units are connected into a loop by control line 14; and when central unit 11 transmits a polling sequence from data transmitting and receiving part 15, the transmission-enable-signal is input to transmission-enable-signal receiving part 31 of terminal unit 12a of the highest priority level in data communication. When the transmission request flip-flop is set, the transmission-enable-signal is held in this receiving part 31, and transmission to adjacent terminal unit 12b is stopped, and data is transmitted from data transmitting and receiving part 21a.
JP11588279A 1979-09-10 1979-09-10 Data communication system Pending JPS5640345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11588279A JPS5640345A (en) 1979-09-10 1979-09-10 Data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11588279A JPS5640345A (en) 1979-09-10 1979-09-10 Data communication system

Publications (1)

Publication Number Publication Date
JPS5640345A true JPS5640345A (en) 1981-04-16

Family

ID=14673504

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11588279A Pending JPS5640345A (en) 1979-09-10 1979-09-10 Data communication system

Country Status (1)

Country Link
JP (1) JPS5640345A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010329A (en) * 1987-04-10 1991-04-23 Fujitsu Limited Block polling data communication system having optimum block determination means
US5128664A (en) * 1986-03-05 1992-07-07 Ampex Corporation Search technique for identifying slave devices connected to a serial bus
US5200743A (en) * 1989-09-01 1993-04-06 Bently Nevada Multiple remote sensor system for real time analog sensing and differential cummunication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5128664A (en) * 1986-03-05 1992-07-07 Ampex Corporation Search technique for identifying slave devices connected to a serial bus
US5010329A (en) * 1987-04-10 1991-04-23 Fujitsu Limited Block polling data communication system having optimum block determination means
US5200743A (en) * 1989-09-01 1993-04-06 Bently Nevada Multiple remote sensor system for real time analog sensing and differential cummunication

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