JPS5476098A - Normal monitor system for open wire - Google Patents

Normal monitor system for open wire

Info

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
Application number
JP14440877A
Other languages
Japanese (ja)
Inventor
Motoharu Terada
Tsutomu Kondo
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP14440877A priority Critical patent/JPS5476098A/en
Publication of JPS5476098A publication Critical patent/JPS5476098A/en
Pending legal-status Critical Current

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
JP14440877A 1977-11-30 1977-11-30 Normal monitor system for open wire Pending JPS5476098A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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