JPS54110704A - High impedance detector circuit for defferential transmission - Google Patents

High impedance detector circuit for defferential transmission

Info

Publication number
JPS54110704A
JPS54110704A JP1780478A JP1780478A JPS54110704A JP S54110704 A JPS54110704 A JP S54110704A JP 1780478 A JP1780478 A JP 1780478A JP 1780478 A JP1780478 A JP 1780478A JP S54110704 A JPS54110704 A JP S54110704A
Authority
JP
Japan
Prior art keywords
terminal
bus
impedance state
differential binary
logic
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
JP1780478A
Other languages
Japanese (ja)
Inventor
Kenichi Hashimoto
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1780478A priority Critical patent/JPS54110704A/en
Publication of JPS54110704A publication Critical patent/JPS54110704A/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)
  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To secure the detection of the fact that the driving circuits are all in the high-impedance state in the differential binary transmission circuit without using a special power source nor the cable different from the data cable. CONSTITUTION:Terminal 63 is fixed to logic ''1'', and the micro voltage of, for example, 40mV is generated at reference potential generator circuit 59 to be applied to terminal 65 and 66. The signal line of the bus in the differential binary transmission circuit is connected to terminal 61 and 62. When the signal is being transmitted to the bus, the differential binary code is available. So the potential difference between two lines is equivalent to the signal amplitude which is usually much larger than 40mV. Accordingly, terminal 64 features logic ''1'' at all times. When the driving circuits connected to the bus are all put under the hihg-impedance state, the potential difference between the two lines becomes zero. Thus, terminal 64 features logic ''0''. In such way, the high-impedance state can be detected for the bus.
JP1780478A 1978-02-17 1978-02-17 High impedance detector circuit for defferential transmission Pending JPS54110704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1780478A JPS54110704A (en) 1978-02-17 1978-02-17 High impedance detector circuit for defferential transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1780478A JPS54110704A (en) 1978-02-17 1978-02-17 High impedance detector circuit for defferential transmission

Publications (1)

Publication Number Publication Date
JPS54110704A true JPS54110704A (en) 1979-08-30

Family

ID=11953904

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1780478A Pending JPS54110704A (en) 1978-02-17 1978-02-17 High impedance detector circuit for defferential transmission

Country Status (1)

Country Link
JP (1) JPS54110704A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173951A (en) * 1983-10-27 1985-09-07 オ−チス　エレベ−タ　コムパニ− Industrial communication system
JPS62193435A (en) * 1986-02-17 1987-08-25 ジ−メンス・アクチエンゲゼルシヤフト Series data transmission circuit device
JPS62193434A (en) * 1986-02-17 1987-08-25 ジ−メンス・アクチエンゲゼルシヤフト Circuit device for series data transmission between a plurality of subscribers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173951A (en) * 1983-10-27 1985-09-07 オ−チス　エレベ−タ　コムパニ− Industrial communication system
JPS62193435A (en) * 1986-02-17 1987-08-25 ジ−メンス・アクチエンゲゼルシヤフト Series data transmission circuit device
JPS62193434A (en) * 1986-02-17 1987-08-25 ジ−メンス・アクチエンゲゼルシヤフト Circuit device for series data transmission between a plurality of subscribers
JPH0652901B2 (en) * 1986-02-17 1994-07-06 ジ−メンス・アクチエンゲゼルシヤフト Serial data transmission circuit device between a plurality of subscribers

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