JPH0317899U

JPH0317899U -

Info

Publication number: JPH0317899U
Application number: JP7520189U
Authority: JP
Priority date: 1989-06-27
Filing date: 1989-06-27
Publication date: 1991-02-21
Anticipated expiration: 2004-06-27
Also published as: JP2517864Y2

Description

[Brief explanation of drawings]

第１図は、請求項１に記載の本考案の第１の実
施例のブロツク構成図、第２図はその電圧判別手
段の具体的な回路例、第３図は第２の実施例のブ
ロツク構成図、第４図はその電圧判別手段の具体
的な回路例、第５図は第２の実施例の防災中継器
を従来の防災システムに組み込んだ場合のシステ
ム構成図、第６図は、従来の防災システムの構成
図、第７図はそのシステムに使用される中継器の
断線検出手段の説明図である。符号の説明、２００……防災受信機、ｌ……多
重信号ライン、１１……多重伝送ユニツト、ｌｃ
……感知器電源ライン、ｌｓ……感知器回路、Ｓ
……感知器、１４…………感知回路、１３，１５
……電圧レベル判別手段、１２……ＣＰＵ、ＶＲ
……基準電圧、１５ａ……比較回路、１，１′…
…防災中継器、１３ｂ，１５ｂ……絶縁伝送回路
。 FIG. 1 is a block configuration diagram of a first embodiment of the present invention as set forth in claim 1, FIG. 2 is a specific circuit example of the voltage discrimination means, and FIG. 3 is a block diagram of the second embodiment. 4 is a specific circuit example of the voltage discrimination means, FIG. 5 is a system configuration diagram when the disaster prevention repeater of the second embodiment is incorporated into a conventional disaster prevention system, and FIG. FIG. 7, which is a block diagram of a conventional disaster prevention system, is an explanatory diagram of a disconnection detection means of a repeater used in the system. Explanation of symbols, 200...Disaster prevention receiver, l...Multiple signal line, 11...Multiple transmission unit, lc
...Sensor power line, ls...Sensor circuit, S
……Sensor, 14……Sensing circuit, 13, 15
...Voltage level determination means, 12...CPU, VR
...Reference voltage, 15a... Comparison circuit, 1, 1'...
...Disaster prevention repeater, 13b, 15b...Insulated transmission circuit.

Claims

[Scope of Claim for Utility Model Registration] (1) A multiplex transmission unit that is connected to a disaster prevention receiver via a multiplex signal line and transmits and receives a monitoring signal based on a multiplexed signal superimposed on a DC power supply, and the above-mentioned disaster prevention receiver. It is connected to the sensor by a sensor power line and receives DC power, while
The DC power supply is supplied to the sensor connected to the sensor line, which is derived from receiving the DC power supplied from the sensor power line, and also sends and receives signals including alarm signals to and from the sensor. a sensing circuit; a voltage level determining means for determining the state of DC power supply to the sensing circuit via the sensor power line and outputting a voltage determining signal; is driven by a DC power supply supplied to the multiplex transmission unit, processes multiplexed signals from the multiplex transmission unit and outputs necessary control signals to the sensing circuit, and also outputs control signals including alarm signals from the sensing circuit. and a CPU that processes a voltage discrimination signal from the voltage level discrimination circuit and transmits a reply signal to the disaster prevention receiver via the multiplex signal transmission unit. (2) The voltage level determining means includes a comparison circuit having a predetermined reference voltage, and the voltage level of the DC power supply supplied to the sensing circuit via the sensor power line is set to the reference voltage. When the voltage level exceeds the reference voltage, a voltage normality determination signal is transmitted from the comparator circuit to the CPU, and when the voltage level of the DC power source falls below the reference voltage, a voltage abnormality determination signal is transmitted to the CPU. The disaster prevention repeater according to claim 1, characterized in that: (3) The disaster prevention according to claim 1, wherein the voltage level determining means further includes an insulating transmission circuit for electrically insulating the voltage determination signal transmitted from the determining means to the CPU. Repeater.