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JPS54109341A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS54109341A
JPS54109341A JP1727778A JP1727778A JPS54109341A JP S54109341 A JPS54109341 A JP S54109341A JP 1727778 A JP1727778 A JP 1727778A JP 1727778 A JP1727778 A JP 1727778A JP S54109341 A JPS54109341 A JP S54109341A
Authority
JP
Japan
Prior art keywords
photo coupler
data transmission
timer
station
data
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
JP1727778A
Other languages
Japanese (ja)
Inventor
Kanji Okujima
Kozo Fujita
Jun Miyazaki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1727778A priority Critical patent/JPS54109341A/en
Publication of JPS54109341A publication Critical patent/JPS54109341A/en
Pending legal-status Critical Current

Links

Landscapes

  • Debugging And Monitoring (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE: To disconnect a station with its photo coupler in trouble from a transmission line by equipping a slave station, which transmits and receives data to and from a master station via the same transmission line by using a photo coupler, with a method of detecting an abnormal photo coupler.
CONSTITUTION: When the luminous element of photo coupler 5 of slave station 2 shots, data are considered to be received even in a short state since data transmission is negative logic, and timer 10 starts operating via inverter 9. If no reset signal arrives until time (t1) set to timer 10, timer 10 reaches its final stage as shown in the figure and FF11 is set by the rise of its output to operate switching element 8, thereby releasing transmission lines 12 and 13 from the short state. Consequently, the system can be operated without influencing the data transmission between the master station and any other slave station and the reliability of the data transmission can be improved.
COPYRIGHT: (C)1979,JPO&Japio
JP1727778A 1978-02-15 1978-02-15 Data transmission system Pending JPS54109341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1727778A JPS54109341A (en) 1978-02-15 1978-02-15 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1727778A JPS54109341A (en) 1978-02-15 1978-02-15 Data transmission system

Publications (1)

Publication Number Publication Date
JPS54109341A true JPS54109341A (en) 1979-08-27

Family

ID=11939476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1727778A Pending JPS54109341A (en) 1978-02-15 1978-02-15 Data transmission system

Country Status (1)

Country Link
JP (1) JPS54109341A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000655A1 (en) * 1979-08-29 1981-03-05 Fuji Electric Co Ltd Wire data transmission system
JP2007303257A (en) * 2006-05-15 2007-11-22 Tachikawa Blind Mfg Co Ltd Joinery handle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000655A1 (en) * 1979-08-29 1981-03-05 Fuji Electric Co Ltd Wire data transmission system
JP2007303257A (en) * 2006-05-15 2007-11-22 Tachikawa Blind Mfg Co Ltd Joinery handle

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