[go: up one dir, main page]

JPS5686546A - Loop-shape communication device - Google Patents

Loop-shape communication device

Info

Publication number
JPS5686546A
JPS5686546A JP16277379A JP16277379A JPS5686546A JP S5686546 A JPS5686546 A JP S5686546A JP 16277379 A JP16277379 A JP 16277379A JP 16277379 A JP16277379 A JP 16277379A JP S5686546 A JPS5686546 A JP S5686546A
Authority
JP
Japan
Prior art keywords
signal
gate
transmission
line vacant
loop
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
JP16277379A
Other languages
Japanese (ja)
Inventor
Yasuo Kaminaga
Nobuhiro Hamada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16277379A priority Critical patent/JPS5686546A/en
Publication of JPS5686546A publication Critical patent/JPS5686546A/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

Landscapes

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

Abstract

PURPOSE:To avoid the transmission of improper transmission frame, by detecting line vacant signal before the line vacant signal is input to communication control LSI of station. CONSTITUTION:When the transmission signal passes through the shift register 11, the data is monitored at the gate 12. The gate 12 produces a signal when the content of the shift register 11 is a line vacant signal, and it is given to the AND gate 14. Further, the communication control LSI 5 produces the detection signal of flag of transmission, and when it is given to the AND gate 14, the AND gate 14 gives the line vacant signal to a microcomputer 7 while the flag and line vacant signal are continuous.
JP16277379A 1979-12-17 1979-12-17 Loop-shape communication device Pending JPS5686546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16277379A JPS5686546A (en) 1979-12-17 1979-12-17 Loop-shape communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16277379A JPS5686546A (en) 1979-12-17 1979-12-17 Loop-shape communication device

Publications (1)

Publication Number Publication Date
JPS5686546A true JPS5686546A (en) 1981-07-14

Family

ID=15760940

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16277379A Pending JPS5686546A (en) 1979-12-17 1979-12-17 Loop-shape communication device

Country Status (1)

Country Link
JP (1) JPS5686546A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5941941A (en) * 1982-09-01 1984-03-08 Hitachi Ltd signal transmission circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5941941A (en) * 1982-09-01 1984-03-08 Hitachi Ltd signal transmission circuit
JPH0245860B2 (en) * 1982-09-01 1990-10-12 Hitachi Ltd

Similar Documents

Publication Publication Date Title
JPS5686546A (en) Loop-shape communication device
JPS5246285A (en) Distant supervisory control
JPS5361946A (en) Electronic device
JPS5310912A (en) Two-way multiplex transmission control system
JPS51137340A (en) Data processing unit
JPS5355902A (en) Data transmission system
JPS51144510A (en) Fault detecting device for a transmission unit
JPS5361375A (en) Counting circuit apparatus
JPS5376785A (en) Receiver of fire alarm system
JPS54140848A (en) Electronic cash register
JPS57106261A (en) Data transmission device
JPS5293889A (en) Transmission control system
JPS5221760A (en) Input judgement circuit
JPS5379407A (en) Terminal equipment for serites type interface
JPS5422135A (en) Command chanin process system
JPS5321512A (en) Multiplex transmission system
JPS51138107A (en) Signal detection output system
JPS5374851A (en) Communication control monitor device between computers
JPS5344782A (en) Sequence control device
JPS53120309A (en) Terminal test system
NO147931C (en) DEVICE FOR MONITORING AN INPUT SIGNAL.
JPS5239084A (en) Display circuit
JPS5758439A (en) Data transmission device
JPS5324718A (en) Signal transmitter
JPS52153137A (en) Coupler circuit for remote carrier supervisory control device