JPS5476098A - Normal monitor system for open wire - Google Patents
Normal monitor system for open wireInfo
- Publication number
- JPS5476098A JPS5476098A JP14440877A JP14440877A JPS5476098A JP S5476098 A JPS5476098 A JP S5476098A JP 14440877 A JP14440877 A JP 14440877A JP 14440877 A JP14440877 A JP 14440877A JP S5476098 A JPS5476098 A JP S5476098A
- Authority
- JP
- Japan
- Prior art keywords
- line
- open wire
- capacitor
- pulse
- pulse voltage
- 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
- Burglar Alarm Systems (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Abstract
PURPOSE: To enable to monitor the open wire of line at all times, by detecting the pulse from the pulse generator provided with the senseor groups parallelly connected each other, with the pulse voltage detection circuit placed at the beginning end of the sensor groups.
CONSTITUTION: The receiver 11 is provided with the pulse generator 12, and the pulse voltage detection circuit 13 is connected to the beginning end of the sensor group 1 in parallel connection and the end capacitor 14 is connected to the end point. Thus, at normal state, the input side of the circuit 13 is in short circuit in high frequency by means of the capacitor 14, and the zener diode 15 and the triac 17 are remained off. On the other hand, if open wire is caused to line, the shortening by the capacitor 14 is released, the pulse voltage is fed to the input terminal of the line 13 via the relay 4, conducting the diode 15 turning on the triac 17, and the buzzer 19 is activated and the occurrence of the open wire of line is informed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14440877A JPS5476098A (en) | 1977-11-30 | 1977-11-30 | Normal monitor system for open wire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14440877A JPS5476098A (en) | 1977-11-30 | 1977-11-30 | Normal monitor system for open wire |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5476098A true JPS5476098A (en) | 1979-06-18 |
Family
ID=15361469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14440877A Pending JPS5476098A (en) | 1977-11-30 | 1977-11-30 | Normal monitor system for open wire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5476098A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60117398A (en) * | 1983-11-29 | 1985-06-24 | 松下電工株式会社 | Disconnection detecting circuit for fire alarm receiver |
-
1977
- 1977-11-30 JP JP14440877A patent/JPS5476098A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60117398A (en) * | 1983-11-29 | 1985-06-24 | 松下電工株式会社 | Disconnection detecting circuit for fire alarm receiver |
JPH0215110B2 (en) * | 1983-11-29 | 1990-04-11 | Matsushita Electric Works Ltd |
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