JPS6028341A - Device for transmitting information of abnormal environment - Google Patents

Abstract

PURPOSE:To save expenses of work and installation and also to simplify the circuit constitution by using a transmission signal such as a clock signal, an address signal and a data signal transmitted from a central unit as a power supply for each terminal device while smoothing the signal. CONSTITUTION:A pulse signal is fed to a gate of transistors (TRs) TR1, TR2 via a terminal 12 from a signal processing circuit 10 of the central unit 1, then the TRs TR1, TR2 are turned off alternately, resulting in that the signal such as the address signal or the data signal is transmitted in time series to a transmission line 3. When the pulse is fed to a terminal device 2, the address signal is compared with the own address by an address detector 6 and when they are coincident, a coincidence signal is fed to a data signal return circuit 7. Further, the pulse fed to a smoothing circuit 9 is charged in a capacitor C until the level is nearly equal to the peak value of the pulse, the result is fed to a constant voltage circuit 5, which acts like a power supply for circuits 6, 7 and a sensor 8 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a terminal device that converts changes in smoke, gas, temperature, etc. into digital signals, and returns the data converted into digital signals when addressed from a solid device. Regarding environmental abnormality transmission devices connected to multiple transmission lines extending from the solid device, power supply and address from the solid device to the terminal,
The present invention also relates to an environmental abnormality transmission device in which a pair of lines can be used for transmitting signals such as data.

Conventionally, in such environmental abnormality transmission equipment, in order to synchronize the solid equipment and each terminal, a clock signal line and
Address/data signal lines, power supply lines, etc. were required.

It is also known that an address/data signal is superimposed on the clock signal line, but this requires a separate power supply line.
The circuit configuration was complicated.

As mentioned above, conventional transmission equipment requires a large number of lines between the solid equipment and the terminal equipment, and construction work and construction work when installing it in buildings, etc.
The equipment cost was high and the circuit configuration was complicated.

This invention solves the above-mentioned drawbacks,
A detailed explanation will be given below based on one embodiment.

FIG. 1 is a block diagram showing the overall configuration of the present invention, in which a pair of lines 3 and 3 extending from a solid device 1 is connected to a terminal device for detecting smoke, temperature, gas caused by a gas leak, etc. caused by a fire, etc. 2 are connected in parallel, usually the solid device 1 sequentially and cyclically calls the terminals each having an address.

Changes in temperature, etc. are monitored.

FIG. 2 schematically shows an example of the circuit of the device shown in FIG. 1, and FIG. 3 shows a time chart for explaining the operation of FIG.

The solid device 1 has two 1s that operate complementarily between the power supply terminals.
．． A series circuit in which the transistors Tri and Tr2 are connected in series through the light emitting element of the photocoupler 4, and the transistors Tr1. It also includes a signal processing circuit 10 that controls Tr2 and to which the output of the photocoupler 4 is applied.

One side of the transmission line 3 is connected to the connection point between the collector electrode of the transistor T1'1 and the light emitting diode of the photocoupler 4, and the other side is connected to the negative terminal.

Terminal 2 includes backflow prevention diode D and line 3.
A smoothing circuit 9 consisting of a capacitor C connected in parallel between
, a constant voltage circuit 5 connected to the smoothing circuit, an address detection circuit 6, a take return circuit 7 to which the output of the address detection circuit 6 is applied, and a change in smoke, temperature, etc. to the data return circuit 7. is controlled by the output of the sensor 8 that applies the voltage and the output of the data return circuit 7, and when conductive, the pulse signal that causes the charge of the smoothing capacitor C to flow into the solid device 1 via the transmission line 3 is transmitted to the transistor l'rl, It is applied to the gate electrode of 'i'rz through terminal 12, and transistors Tr + and Tr2i are alternately tg ON・(JFF
1, As a result, address signals, data signals, etc. are transmitted to the transmission line 3 in time series.

When these pulses are applied to the terminal device 2, the address signal is compared with its own address by the address detector 6, and if they match, a match signal is applied to the data signal return circuit 7. Further, the pulse applied to the smoothing circuit 9 charges the capacitor C to approximately the peak value of the pulse, and is applied to the constant voltage circuit 5, which operates as a power source for each circuit 6, 7, sensor 8, etc.

When the address match signal is applied to the data signal return circuit 7, the value of the sensor 8 at that time is converted from analog to digital, and after parallel to serial conversion, is applied to the transistor Tl-3 as a data signal. In this embodiment, a 5-pin data signal is used as shown in D in FIG. is turned on, and the charge stored in the capacitor C is discharged to the line 3. At this time, the transistor Trz side of the solid device 1 is turned on.
Therefore, the discharge of the capacitor flows into the photocoupler 4. By using the data of the terminal device 2 in this manner, it is possible to determine whether there is a fire and perform necessary display or control.

As described above, in the present invention, since the signal line and the power line are shared by a pair of lines, a large number of terminals can be sequentially and cyclically called.
When used in fire alarm equipment or the like that detects the environmental condition of each terminal, it has the advantage that construction costs and equipment costs are low, and the circuit configuration can be extremely simple.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an outline of the overall configuration of an embodiment of the present invention, FIG. 2 is a diagram showing an example of the circuit shown in FIG. 1, and FIG. 3 is a time chart for explaining the operation of FIG. 2. are shown respectively. 1...Solid device, 2...Terminal (number of units), 3...Transmission line, 6...Patent applicant Nittan Co., Ltd.

Claims (1)

[Claims] A solid device sequentially and cyclically calls each of a plurality of terminals having an address using an address signal, and each called terminal sends smoke to the solid device. In environmental abnormality transmission equipment that converts physical quantities such as gas and temperature into electrical signals and sends back data signals, it smoothes transmission signals such as clock signals, address signals, and data signals sent from solid equipment as a power source for each terminal device. An environmental abnormality transmission device characterized in that it is used as