JPS5779750A - Isolation circuit for bidirectional digital signal transmission line - Google Patents

Isolation circuit for bidirectional digital signal transmission line

Info

Publication number
JPS5779750A
JPS5779750A JP15609080A JP15609080A JPS5779750A JP S5779750 A JPS5779750 A JP S5779750A JP 15609080 A JP15609080 A JP 15609080A JP 15609080 A JP15609080 A JP 15609080A JP S5779750 A JPS5779750 A JP S5779750A
Authority
JP
Japan
Prior art keywords
digital signal
signal
transmission line
isolation circuit
signal transmission
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.)
Granted
Application number
JP15609080A
Other languages
Japanese (ja)
Other versions
JPS5929983B2 (en
Inventor
Shiro Fukuda
Masashi Kamio
Naoyuki Konishi
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 JP15609080A priority Critical patent/JPS5929983B2/en
Publication of JPS5779750A publication Critical patent/JPS5779750A/en
Publication of JPS5929983B2 publication Critical patent/JPS5929983B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/26—Circuits with optical sensing means, i.e. using opto-couplers for isolation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To achieve an isolation circuit for multi-directional digital signal transmission line decreased with the number of tri-state buffers by inserting two photo couplers between signal high level and low level lines in series and avoiding the switching part of signal transmitting direction. CONSTITUTION:In transmitting a digital signal from the 1st device 1 to the 2nd device 2, enable signals A, B of the both devices 1, 2 are taken as logical ''0'' and ''1''. With this state, when data signals ''0'' and ''1'' are transmitted from a transmission driver 21, this signal is transmitted to the receiver 23 of the 2nd device via a light emitting diode 7 of photo couplers 7, 8. Inversely, in transmitting a signal from the device 2 to the device 1, enable signa A is taken as logical ''1'' and the B is as ''0'', allowing to transmit the digital signal from a transmission driver 22 to a receiver 20 in the device 1.
JP15609080A 1980-11-05 1980-11-05 Insulated circuit for bidirectional digital signal transmission line Expired JPS5929983B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15609080A JPS5929983B2 (en) 1980-11-05 1980-11-05 Insulated circuit for bidirectional digital signal transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15609080A JPS5929983B2 (en) 1980-11-05 1980-11-05 Insulated circuit for bidirectional digital signal transmission line

Publications (2)

Publication Number Publication Date
JPS5779750A true JPS5779750A (en) 1982-05-19
JPS5929983B2 JPS5929983B2 (en) 1984-07-24

Family

ID=15620081

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15609080A Expired JPS5929983B2 (en) 1980-11-05 1980-11-05 Insulated circuit for bidirectional digital signal transmission line

Country Status (1)

Country Link
JP (1) JPS5929983B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006157230A (en) * 2004-11-26 2006-06-15 Asuka Electron Kk Data carrier circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006157230A (en) * 2004-11-26 2006-06-15 Asuka Electron Kk Data carrier circuit

Also Published As

Publication number Publication date
JPS5929983B2 (en) 1984-07-24

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