JPS54110704A - High impedance detector circuit for defferential transmission - Google Patents
High impedance detector circuit for defferential transmissionInfo
- 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
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.
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)
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 |
-
1978
- 1978-02-17 JP JP1780478A patent/JPS54110704A/en active Pending
Cited By (4)
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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