JPS6485518A - Bus line service interruption detector - Google Patents
Bus line service interruption detectorInfo
- Publication number
- JPS6485518A JPS6485518A JP62238802A JP23880287A JPS6485518A JP S6485518 A JPS6485518 A JP S6485518A JP 62238802 A JP62238802 A JP 62238802A JP 23880287 A JP23880287 A JP 23880287A JP S6485518 A JPS6485518 A JP S6485518A
- Authority
- JP
- Japan
- Prior art keywords
- bus line
- service interruption
- circuit
- waveforms
- pulse
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To enable service interruption to be quickly detected, by comparing the waveform of bus line residual-voltage after the service interruption of a bus line, with a reference frequency waveform, and by judging the waveforms as from the service interruption of the bus line when the waveforms are positionally shifted from each other continuously at specified intervals only. CONSTITUTION:A bus line service interruption detector has a combining circuit 1 for putting the waveform of bus line residual-voltage together with a reference frequency waveform, a pulse generating circuit 2 for generating positionally shifted intervals between the combined waveforms, as pulse, and a judging circuit 3, as a comparison stabilizing circuit. To the combining circuit 1, a phase detecting circuit 5 and a reference frequency generator 6 are connected, and when the waveforms of input from the combining circuit 1 are positionally shifted from each other, then by the pulse generating circuit 2, pulse for the positionally shifted intervals is generated. Then, the judging circuit 3 judges that the service interruption of a bus line 8 is generated when the input of two pulses or more of its pulse width at least is continuously provided, thereby outputting bus line service interruption command signal (a).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62238802A JPS6485518A (en) | 1987-09-25 | 1987-09-25 | Bus line service interruption detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62238802A JPS6485518A (en) | 1987-09-25 | 1987-09-25 | Bus line service interruption detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6485518A true JPS6485518A (en) | 1989-03-30 |
Family
ID=17035507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62238802A Pending JPS6485518A (en) | 1987-09-25 | 1987-09-25 | Bus line service interruption detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6485518A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5105307A (en) * | 1988-11-04 | 1992-04-14 | Fuji Electrochemical Co., Ltd. | Optical isolator |
US6075642A (en) * | 1998-06-18 | 2000-06-13 | Hewlett-Packard Company | Multi-port optical isolator |
-
1987
- 1987-09-25 JP JP62238802A patent/JPS6485518A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5105307A (en) * | 1988-11-04 | 1992-04-14 | Fuji Electrochemical Co., Ltd. | Optical isolator |
US6075642A (en) * | 1998-06-18 | 2000-06-13 | Hewlett-Packard Company | Multi-port optical isolator |
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