JP2004094720A - System for monitoring disaster damage prevention - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance reliability with the minimum configuration by reducing the interference of the calling signal of a transmission signal and the adverse effect of the external noise on a sensor line on the transmission signal. <P>SOLUTION: A transmission line S, a transmission common line SC, a power line V, a telephone line T, and a common line C with respect to the power line V and the telephone line T are pulled out as transmission lines 2 from a receiver 1. A repeater 3 for a sensor comprises a transmission circuit section 13, a CPU (Central Processing Unit) circuit section 14, and a fire reception circuit section 15. The transmission circuit section 13 is connected to the CPU circuit section 14 through electrically isolating photocouplers 16, 17. The transmission circuit section 13 is connected to the transmission line S and the transmission common line SC from the receiver 1. The CPU circuit section 14 and the fire reception circuit section 15 side are connected to the power line V and the common line C from the receiver 1. In addition, the telephone line T from the receiver 1 is connected to one end of a telephone jack 5; and a telephone common line TC from the other end of the telephone jack 5 is connected to the common line C from the receiver 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a receiver repeater is called by designating a terminal address from a receiver to collect and monitor terminal information including a fire detection signal of a fire detector. The present invention relates to a disaster prevention monitoring system that allows a telephone to be selectively inserted into and connected to a telephone jack on a terminal side to enable communication.
[0002]
[Prior art]
FIG. 7 shows an example of a conventional disaster prevention monitoring system that collects and monitors disaster prevention information by a call by address designation between a receiver and a terminal known as an R type.
[0003]
In FIG. 7, reference numeral 100 denotes a receiver, and a plurality of sensor repeaters 104 are connected to a transmission line 102 drawn from the receiver 100. A transmission line 102 from the receiver 100 is a power line V, a transmission line S, a transmission common line SC, and a telephone line T.
[0004]
A plurality of sensor lines L1 to Ln and a sensor common line LC are drawn from the sensor repeater 104, and an ON / OFF type fire is generated between each of the sensor lines L1 to Ln and the sensor common line LC. The sensor 106 is connected.
[0005]
Further, a telephone jack 108 is installed on the terminal side where the sensor repeater 104 is installed. A telephone line T from the receiver 100 is connected to one end of the telephone jack 108, and a telephone call from the other end of the telephone jack 108 is made. The common line TC is connected to the sensor common line LC.
[0006]
The receiver 100 transmits a call command specifying the set terminal address to the repeater for sensor 104, and transmits terminal information including a fire detection signal of the fire detector 106 from the repeater for sensor 104 that has determined coincidence with its own address. Collect and monitor.
[0007]
When the telephone 110 is inserted and connected to the telephone jack 108 of the terminal, a telephone call is made by the receiver 100. When the telephone is inserted and connected to the telephone jack provided on the receiver 100, the telephone line T and the transmission common line SC are connected. Is formed, and the terminal can communicate with the receiver 100 by telephone.
[0008]
FIG. 8 shows an internal circuit together with a receiver, taking one sensor repeater of FIG. 7 as an example. The sensor repeater 104 includes a transmission circuit unit 112, a CPU circuit unit 114, and a fire reception circuit unit 116. The transmission circuit unit 112 operates by receiving a power supply voltage applied between the transmission line S and the transmission common line SC, receives and amplifies a call signal transmitted by being superimposed on the power supply voltage, and inputs the amplified signal to the CPU circuit unit 114. are doing. The response signal from the CPU circuit unit 114 is converted into a current signal and transmitted to the receiver 100.
[0009]
The CPU circuit unit 114 compares the address of the call signal with its own address and determines that the call is its own call, and transmits terminal information including the fire detection signal of the fire detector 106 to the receiver 100 as a response signal. Let it.
[0010]
The fire receiving circuit unit 116 receives a current generated by the fire detection of the fire detector 106 connected between the detector lines L1 to Ln and the detector common line LC, and outputs a fire detection signal for each line to the CPU circuit unit 11. Output. Further, the fire receiving circuit unit 116 also performs disconnection detection between the sensor lines L1 to Ln and the sensor common line LC.
[0011]
[Patent Document 1]
JP-A-4-348498
[Patent Document 2]
JP-A-5-336261
[Patent Document 3]
JP-A-9-81870
[0012]
[Problems to be solved by the invention]
However, in such a conventional disaster prevention monitoring system, since the common lines for the power supply line V, the transmission line S, and the telephone line T are all combined as the transmission common line SC, the transmission signal for the transmission line S is generated by the telephone call sound. And it was very difficult to hear. That is, the data transmission rate between the receiver and the sensor repeater is relatively low, for example, 1200 bps. At this transmission rate, the main component of the transmission pulse exists in the audio frequency band, and the transmission signal is transmitted by the telephone. Superimposed on call sound, very difficult to hear.
[0013]
In addition, when external noise is induced in the sensor lines L1 to Ln, external noise is also induced in the transmission common line SC, and there is a problem that transmission is adversely affected.
[0014]
As a countermeasure, it is conceivable to separate the telephone common TC of the telephone line T from the transmission common line SC as shown in FIG. However, the influence of the external noise induced on the sensor lines L1 to Ln on the transmission common line SC still remains.
[0015]
As another countermeasure, it is conceivable to electrically separate the CPU circuit unit 114 and the fire receiving circuit unit 116 with a photocoupler 118 as shown in FIG. However, for example, four photocouplers 118 are required for one sensor line, and if the number of standard sensor lines is eight, as many as 32 photocouplers are required, and the circuit scale becomes too large to be adopted. It is not possible.
[0016]
Further, in the conventional system of FIG. 7, the disconnection detection between the sensor lines L1 to Ln and the sensor common line LC is also performed by a disconnection detection circuit built in the fire receiving circuit unit 116 of the sensor repeater 104. In this disconnection detection, the line voltage is compared with a predetermined threshold voltage to determine whether there is a disconnection. However, since the telephone common line TC and the sensor common LC are shared, a call sound is superimposed on the sensor line when the telephone 110 is used. However, this may adversely affect the disconnection detection function and cause erroneous disconnection detection.
[0017]
Some disconnection detection circuits perform disconnection detection by changing the voltage applied to the sensing line. In this case, noise due to the change in the voltage of the detector line is superimposed on the call sound, and the telephone call sound is reduced. But there were some difficulties.
[0018]
An object of the present invention is to provide a disaster prevention monitoring system that improves the reliability by reducing the influence of a transmission signal on a call signal and the influence of external noise of a detector line on a transmission signal with minimum equipment and circuit configuration. Aim.
[0019]
[Means for Solving the Problems]
To achieve this object, the present invention is configured as follows.
[0020]
According to the present invention, a plurality of sensor repeaters are connected to a transmission line drawn from a receiver, a fire detector is connected to a sensor line drawn from the sensor repeater, and a terminal address from the receiver is connected. Calls the repeater for the sensor according to the specification, collects and monitors the terminal information including the fire detection signal of the fire detector, and selects the telephone as the telephone jack on the terminal side of the telephone line drawn from the receiver. It is intended for a disaster prevention monitoring system that can be inserted and connected to enable telephone communication.
[0021]
With respect to such a disaster prevention monitoring system, the present invention provides a transmission line, a transmission common line, a power line, a telephone line, a common line for the power line and the telephone line as a transmission line from the receiver, and a repeater for the sensor is provided. , A transmission circuit unit, a CPU circuit unit, and a fire receiving circuit unit. The transmission circuit unit and the CPU circuit unit are coupled by a photocoupler that electrically separates an upstream signal and a downstream signal and exchanges them. Section, connect the transmission line from the receiver and the transmission common line, connect the CPU circuit section and the fire receiving circuit section to the power supply line and the common line from the receiver, and connect the telephone line from the receiver to the telephone jack. It is characterized in that it is connected to one end and a telephone common line from the other end of the telephone jack is connected to a common line from a receiver.
[0022]
As described above, the transmission circuit unit and the CPU circuit unit in the sensor repeater are electrically separated by coupling with a photocoupler, so that the number of photocouplers is minimized, and the transmission line side with respect to the receiver is connected to the transmission line side. Since the detector line side is separated from the fire detector, the transmission signal is not superimposed on the telephone line, and external noise does not adversely affect the transmission signal.
[0023]
In the disaster prevention monitoring system of the present invention, for example, several hundred repeaters for sensors are connected to the transmission line from the receiver. Therefore, in the case of a calling signal from the receiver, the LEDs of the photocouplers provided for separation in all the sensor repeaters are turned on and off at the same time in synchronization with the calling signal. For this reason, the current of the transmission line changes greatly. Since the transmission line has a line resistance, this changes the voltage of the transmission line. Since the fluctuation of the line voltage is synchronized with the transmission signal, the transmission signal changes, and the reliability of the transmission is impaired.
[0024]
Therefore, the present invention, as a transmission circuit section of a repeater for a sensor, receives and amplifies a call signal transmitted by being superimposed on a power supply voltage from a receiver between a transmission line and a transmission common line, and drives the light emitting section of the photocoupler. Amplifier, a constant current circuit that outputs a constant current using the line voltage between the transmission line and the transmission common line on which the calling signal is superimposed, and an amplifier that converts the constant current output of the constant current circuit to a constant power supply voltage. And a constant voltage circuit for applying the voltage to the power supply.
[0025]
As a result, a constant power supply voltage based on the constant current output from the constant current circuit is supplied to the amplifier that drives the light emission of the photocoupler of the transmission circuit unit, so even if the LED of the photocoupler is turned on and off by the transmission signal, The current in the transmission line does not change and does not affect the transmission signal.
[0026]
In the disaster prevention monitoring system according to the present invention, the sensor repeater includes a disconnection detection circuit that detects disconnection of the sensor line, and the receiver detects the insertion connection of the telephone to the telephone jack on the terminal side. And a transmission circuit unit for transmitting a control signal for stopping the operation of the disconnection detection circuit of the sensor repeater while the insertion detection output of the insertion detection unit is obtained.
[0027]
When the telephone is inserted into the telephone jack in this way, the receiver detects the insertion of the telephone, and the sensor repeater can stop the detection of the disconnection of the sensor line. Does not adversely affect the disconnection detection function,
A change in the voltage of the sensor line for detecting a disconnection does not adversely affect the speech sound.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an explanatory diagram of the system configuration of the disaster prevention monitoring system of the present invention. In FIG. 1, the disaster prevention monitoring system of the present invention includes a power supply line V, a transmission line S, a transmission common line SC, a telephone line T, and a transmission line 2 from a receiver 1 installed in an administrator room or the like to a guard area. The common line C is drawn. Here, the common line C is a common line for the power line V and the telephone line T.
[0029]
A plurality of sensor repeaters 3 are provided for the transmission path 2 drawn from the receiver 1. In the disaster prevention monitoring system of the present invention, the receiver 1 transmits a command such as a call by designating the terminal address set in the sensor repeater 3 and receives response information. Can connect as many repeaters 3 as the number of terminals that can be set to the terminal address. In a large-scale disaster prevention monitoring system, several hundred repeaters 3 are connected to the receiver 1. .
[0030]
A plurality of sensor lines L1 to Ln and a sensor common line LC are drawn from the sensor repeater 3, and an ON / OFF type fire detection is provided between each of the sensor lines L1 to Ln and the sensor common line LC. Unit 4 is connected.
[0031]
In this example, a case where one fire detector 4 is connected to each of the detector lines L1 to Ln is taken as an example, but a plurality of fire detectors 4 may be provided for each detector line as necessary. Connected. A terminator for disconnection detection is connected to the ends of the sensor lines L1 to Ln, but this is omitted.
[0032]
On the other hand, a telephone jack 5 is provided in the guard area where the repeater 3 for the sensor is installed, for performing communication between the receiver 1 and the site. Specifically, the telephone jack 5 is provided in a fire transmitter or the like installed in a security area.
[0033]
One end of the telephone jack 5 is connected to a telephone line T drawn from the receiver 1, and the other end of the telephone jack 5 is connected to a sensor common line LC drawn from the sensor repeater 3 by a telephone common line TC. The common line C drawn from the receiver 1 is connected to the sensor common line LC.
[0034]
Here, the telephone 6 is inserted and connected by a plug to the telephone jack 5 provided corresponding to the uppermost sensor repeater 3 among the plurality of sensor repeaters 3. By the insertion connection of the telephone 6, a communication circuit is formed through the telephone line T from the receiver 1, the telephone common line TC, the common line LC, and the sensor common line C, and a telephone call is performed in the receiver 1. On the other hand, by inserting and connecting a telephone to a telephone jack provided in the receiver 1 as will be described later, a telephone call can be made with the telephone 6 on the terminal side.
[0035]
FIG. 2 is a block diagram of an embodiment of the present invention in which one of the sensor repeaters 3 of FIG. 2, the receiver 1 is provided with a monitoring control unit 7, a transmission circuit unit 8, an operation display unit 9, a telephone circuit unit 10, and a telephone jack 11. A telephone 12 is inserted and connected to the telephone jack during a call.
[0036]
On the other hand, the sensor repeater 3 is provided with a transmission circuit unit 13, a CPU circuit unit 14, and a fire reception circuit unit 15. In the sensor repeater 3 of the present invention, photocouplers 16 and 17 are provided for the exchange of the downstream signal and the upstream signal between the transmission circuit unit 13 and the CPU circuit unit 14, and are electrically separated. .
[0037]
The photocouplers 16 and 17 include LEDs 16a and 17a as light emitting units and phototransistors 16b and 17b as light receiving units. The photocoupler 16 is for a downstream signal for transmitting a signal from the transmission circuit unit 13 to the CPU circuit unit 14. The photocoupler 17 is for an upstream signal for transmitting a signal from the CPU circuit unit 14 to the transmission circuit unit 13.
[0038]
Power is supplied to the transmission circuit unit 13 by the transmission line S and the transmission common line SC. Therefore, between the transmission line S and the transmission common line C, a down signal from the transmission circuit unit 8 and an up signal from the transmission circuit unit 13 are superimposed simultaneously with the power supply voltage.
[0039]
Here, the downstream signal from the transmission circuit unit 8 of the receiver 1 is superimposed as a voltage signal between the transmission line S also serving as a power supply line and the transmission common line SC. The upstream signal from the transmission circuit unit 13 of the sensor repeater 3 to the receiver 1 is transmitted by changing the line current flowing between the transmission line S and the transmission common line SC.
[0040]
In the normal monitoring state, the transmission circuit unit 8 of the receiver 1 transmits a paging signal including a paging command in which the terminal addresses of the sensor repeaters 3 are sequentially specified. The signal is received by the transmission circuit unit 13 of the device 3 and input to the CPU circuit unit 14 via the photocoupler 16.
[0041]
The CPU circuit unit 14 extracts a call address from the received call signal, compares the extracted call address with a preset self-address, and when it determines that the address matches, the photocoupler 17 converts the state signal in the sensor repeater 3 at that time into a photocoupler 17. To the transmission circuit unit 13 via the interface, and the transmission circuit unit 13 sends the change to the receiver 1 as a change in line current.
[0042]
As a response signal of the sensor repeater 3 to the call signal from the receiver 1, for example, a detection state such as normal, failure, or fire is set and corresponded to a specific bit in 8-bit response data. A response signal is returned to the receiver by setting the status bit.
[0043]
When a fire is detected, a fire interrupt signal is sent to the receiver 1 so that the receiver 1 performs a fire interrupt process. That is, when receiving the fire interrupt signal from the sensor repeater 3, the receiver 1 executes an address search process for searching for the address of the sensor repeater 3 that has detected the fire, and detects the fire. The repeater 3 for the sensor is specified, and a call signal is continuously transmitted to the repeater 3 for the sensor at the specified address to obtain a response of the fire detection information.
[0044]
Further, the transmission circuit section 8 of the receiver 1 transmits a disconnection detection control signal at a constant period, for example, every one second, in parallel with the transfer of the call signal to the sensor repeater 3. Upon receiving the signal, the CPU circuit unit 14 causes the fire receiving circuit unit 15 to perform a disconnection detection operation between the sensor lines L1 to Ln and the sensor common line LC. The result of the disconnection detection operation is returned by a response signal to the next call signal after the disconnection detection processing is completed.
[0045]
The monitoring control unit 7 of the receiver 1 performs a fire reception process, a failure occurrence process, and the like based on the information about the sensor repeater 3 obtained by the transmission control with the sensor repeater 3 by the transmission circuit unit 8. Perform monitoring control. An operation display unit 9 is provided for the monitoring control unit 7, and an operation input necessary for each display is performed in addition to a fire display and a failure display.
[0046]
Further, when the telephone 6 is inserted and connected to the telephone jack 5 on the terminal side as shown in the figure, the telephone circuit section 10 detects a current flowing between the telephone line T and the common line C and recognizes the telephone connection. Then, it notifies the monitoring control unit 7 of the telephone insertion connection and causes the telephone call operation to be performed.
[0047]
If there is a call, the administrator can take out the telephone 12 installed in the receiver 1 and connect it to the telephone jack 11 to make a telephone call with the telephone 6 on the terminal side. .
[0048]
FIG. 3 is a circuit block diagram showing details of each circuit section of the sensor repeater 3 of FIG. In FIG. 3, the transmission circuit unit 13 is provided with a reception circuit 18 and a transmission circuit 19. The receiving circuit 18 is provided with an LED 16a of the photocoupler 16, drives the LED 16a to emit light by a calling signal transmitted from the receiver, and controls on / off of the phototransistor 16b on the CPU circuit unit 14 side.
[0049]
The transmission circuit 19 is provided with a photocoupler 17 to change the line currents of the transmission line S and the transmission common line SC by turning on and off the phototransistor 17b by the light emission driving of the LED 17a in response to a response signal from the CPU circuit unit 14. Then, a response signal is transmitted to the receiver 1.
[0050]
The CPU circuit unit 14 includes a CPU 20, a light receiving circuit 21, a light emitting circuit 22, a memory 23, a disconnection monitoring control unit 24, an A / D converter 25, and a constant voltage circuit 30. Each circuit section of the CPU circuit section 14 including the CPU 20 inputs a power supply voltage between the power supply line V from the receiver and the common line C to the constant voltage circuit 30. A power supply voltage of 20 volts is output to the fire receiving circuit unit 15 side, for example.
[0051]
As a calling signal to the CPU 20, a signal received at the light receiving terminal te # 21 is input via the photocoupler 16. In the memory 23, a terminal address previously assigned to the sensor repeater 3 is stored, and the CPU 20 compares the address extracted from the calling signal with the light receiving address in the memory 23 to determine the calling of the receiver.
[0052]
Further, when the CPU 20 receives a disconnection detection control signal from the receiver at intervals of, for example, one minute, it drives the disconnection monitoring control unit 24, and the line receiving circuit provided for each of the sensor lines L1 to Ln on the fire receiving circuit unit 15 side. The detection operation of the disconnection detection circuit built in the controller 26 is performed.
[0053]
Further, the CPU 20 inputs, in parallel, the converted voltage of the line current detected by the line receiving circuit 26 of the sensor lines L1 to Ln provided in the fire receiving circuit unit 15 to the A / D converter 25. Is periodically sampled and taken into the CPU 20.
[0054]
Further, at the disconnection detection timing when the disconnection monitoring control unit 24 is operated, since the disconnection detection circuit of the line receiving circuit unit 26 is operating, the line current sampled by the A / D converter 25 at this time is detected. The conversion voltage indicates a disconnection detection state.
[0055]
In the disaster prevention monitoring system of the present invention in which the sensor repeater 3 of FIG. 2 having the respective circuit units as shown in the embodiment of FIG. 3 is connected to the receiver 1, the transmission circuit in the sensor repeater 3 is used. Since the unit 13 and the CPU circuit unit 14 are electrically separated by the coupling of the photocouplers 16 and 17, a call signal (down signal) and a response signal (down signal) transmitted between the transmission line S and the transmission common line SC. Since the transmission pulse of the upstream signal has a data transmission rate of, for example, 1200 bpi, even if it is in the audible frequency band of the telephone 6, the transmission noise due to the transmission pulse is electrically separated because of the electrical separation. , 12 are not superimposed.
[0056]
Conversely, even if extraneous noise is superimposed on the sensor lines L1 to Ln drawn from the fire receiving circuit unit 15, the sensor common line LC and the transmission common line SC are electrically separated from each other. The external noise superimposed on L1 to Ln is superimposed on the transmission line S and the transmission common line SC, and the transmission signal of the call signal and the response signal is not adversely affected by the external noise.
[0057]
Further, since the transmission circuit unit 13 and the CPU circuit unit 14 are electrically separated by the photocouplers 16 and 17, a common line C for the power line V and the telephone line T is newly drawn from the receiver 1. The common line C is connected to the CPU circuit section 14 side of the relay unit 3 for the sensor, and the common line LC is used as it is for the fire detector 4 side.
[0058]
For this reason, the common line C newly drawn from the receiver only needs to reach the relay unit 3 for the detector, and drawing out to the fire detector 4 side becomes unnecessary, and the common line C is newly connected to the transmission line 2 from the receiver 1. Even if one line is added, the scale and man-hours required for the extension can be reduced sufficiently compared to the case where the telephone common line TC is completely separated from the telephone line T as shown in FIG. It is relatively easy to apply the present invention even to the fire alarm system described above.
[0059]
FIG. 4 is a circuit diagram showing an embodiment of the receiving circuit 18 provided in the transmission circuit unit 13 of the sensor repeater 3 of FIG. In the disaster prevention monitoring system of the present invention as shown in FIG. 2, since the photocouplers 16 and 17 are provided between the transmission circuit unit 13 and the CPU circuit unit 14 of the sensor repeater 3, the receiver 1 shown in FIG. Considering the case where, for example, hundreds of sensor repeaters 3 are connected, the photocoupler 16 provided in the transmission circuit unit 13 is synchronized with a calling signal (down signal) from the receiver 1. The LEDs 16a are simultaneously turned on and off in synchronization with the calling signal.
[0060]
The simultaneous operation of the photocoupler LEDs in the transmission circuit section 13 of the sensor repeater 3 causes a large change in the transmission current flowing through the transmission line S and the transmission common line SC. Since the transmission line S and the transmission common line SC have a line resistance, the voltage between the transmission line S and the transmission common line SC increases due to a current change caused by turning on and off the LEDs of the photocoupler at the same time due to the line resistance. Change.
[0061]
Since the transmission circuit unit 13 operates by receiving the supply of the power supply voltage between the transmission line S and the transmission common line SC, when the line current changes due to the simultaneous operation of the LEDs of the photocoupler, the line voltage changes. The voltage greatly fluctuates, the operating characteristics of the amplifier and the like provided in the transmission circuit unit 13 change, and it becomes impossible to correctly receive a transmission signal, so that reliability may be impaired.
[0062]
Therefore, in the receiving circuit 18 of the transmission circuit unit 13 in FIG. 4, a constant current circuit is formed by the Zener diode ZD1, the resistors R1 and R2, and the transistor Q1, and the voltage between the transmission line S and the transmission common line SC is changed by a photocoupler. Even if the LED fluctuates in a pulsed manner, a constant current is always output from the collector of the transistor Q1.
[0063]
A Zener diode ZD2 functioning as a constant voltage circuit is connected to the collector of the transistor Q1. The constant current output is converted to a constant voltage determined by the Zener voltage of the Zener diode ZD2, and a constant power supply voltage is supplied to the amplifier 27. Will be.
[0064]
The transmission line S is connected to the input of the amplifier 27, amplifies the ringing signal superimposed on the voltage of the transmission line S, and drives the LED 16a of the photocoupler 16 to emit light. The current consumed when the LED 16a is driven to emit light by the amplifier 27 is a constant current output of the constant current circuit including the transistor Q1, so that even if the LED 16a is turned on and off, the transmission line S and the transmission common line SC The flowing current is a constant current.
[0065]
For this reason, even if the LED of the photocoupler is driven to emit light in synchronization with the ringing signal by a large number of sensor repeaters 3, the line current does not fluctuate, and the line voltage used as the power supply voltage does not fluctuate. The amplifier 27 of 18 can stably receive and amplify the calling signal and output it to the CPU circuit unit 14 via the photocoupler 16.
[0066]
FIG. 5 shows another embodiment of the disaster prevention monitoring system according to the present invention. In this embodiment, when the receiver detects the insertion connection of the telephone 6 to the telephone jack on the terminal side, the relay for the sensor is detected. The disconnection detection operation of the sensor line in the detector is stopped.
[0067]
In the disaster prevention monitoring system shown in FIG. 5, according to the present invention, a telephone call from the telephone jack 5 is connected to the sensor common line LC of the CPU circuit section 14 and the fire receiving circuit section 15 which are electrically separated by the photocouplers 16 and 17. The common line TC is connected and shared. Therefore, when a telephone 6 is inserted into the telephone jack 5 and connected to the telephone 12 of the receiver 1, a call signal causes the fire detector 4 to communicate. Since the sensor common line LC on the side fluctuates and the disconnection detection of the sensor lines L1 to Ln is set strictly to determine the line current, the disconnection may be erroneously detected due to the variation due to the speech signal. .
[0068]
On the other hand, when viewed from the call side, as shown in FIG. 3, the line receiving circuit 26 provided in the fire receiving circuit unit 15 receives control from the disconnection monitoring control unit 24 of the CPU circuit unit 14, for example, every one minute. A disconnection detection operation is performed every time. As the disconnection detecting operation, the line current flowing through the terminator is monitored while the line voltage of the sensor lines L1 to Ln in the normal monitoring state is changed to a high voltage of, for example, 35 volts, and the presence or absence of a disconnection is monitored. I'm trying to judge.
[0069]
For this reason, when the disconnection is detected, the telephone common line TC is shared with the sensor common line LC by changing the voltage of the sensor lines L1 to Ln in a pulsed manner, so that noise accompanying the disconnection detection operation is reduced. It is superimposed on the call signal, causing a problem that the call is difficult to hear.
[0070]
In the embodiment shown in FIG. 5, the receiver 1 is provided with an insertion detector 28. When the insertion detector 28 detects the insertion connection of the telephone 6 to the telephone jack 5 of the terminal, the insertion detector 28 is inserted into the transmission circuit unit 8. The transmission circuit unit 8 is notified of the detection, and stops transmitting the disconnection detection control signal to the sensor repeater 3 in response to the notification.
[0071]
For this reason, while the telephone 6 is connected to the telephone jack 5 and talking with the telephone 12 of the receiver 1, the disconnection detection signal is not output from the transmission circuit unit 8 to the repeater 3 for the sensor, and Since disconnection detection between the sensor lines L1 to Ln and the sensor common line LC is not performed in the receiving circuit unit 15, the disconnection detection is not adversely affected by the speech signal, and at the same time, noise due to the disconnection detection is eliminated. It is possible to prevent the call from being difficult to hear.
[0072]
FIG. 6 is a flowchart of a transmission process in the transmission circuit unit 8 of the receiver 1 of FIG. The transmission circuit unit 8 transmits a call signal containing a call command while sequentially specifying the terminal address in step S1, and receives a response signal from the repeater 3 for a sensor that has obtained an address match. I have.
[0073]
When a predetermined time, for example, one second, elapses between the call responses, the disconnection detection timing is determined in step S2, and it is checked in step S3 whether the insertion detection unit 28 detects the insertion of the telephone. If there is no insertion of the telephone 6 into the telephone jack 5, a disconnection detection control signal is transmitted in step S4, and the repeater for sensor 3 performs a disconnection detection operation.
[0074]
On the other hand, when the insertion connection of the telephone is detected at the disconnection detection timing, the transmission of the disconnection test signal in step S4 is skipped. As a result, the disconnection detecting operation is not performed in the sensor repeater 3 during a call.
[0075]
Subsequently, a fire interrupt is checked in step S5, and when a fire interrupt is detected, an address search process for specifying an address of the sensor repeater in which a fire is detected is performed in step S6. Then, in step S7, a call signal is continuously transmitted to the repeater for the fire-detecting device whose address has been detected and the data detection process is performed. In response to the detection processing of the fire detection data by the transmission circuit section 8, the monitoring control section 7 of the receiver 1 performs a fire judgment and a fire alarm display.
[0076]
In step S8, when the fire is extinguished and a recovery operation is performed by the monitor, the recovery from the fire is determined, and a series of processes is terminated. If the receiver is not stopped in step S9, the process returns to step S1 again. , Will resume fire monitoring.
[0077]
In the above embodiment, the disaster prevention monitoring system in which only the sensor repeater 3 is provided on the transmission path 2 from the receiver 1 is taken as an example. In addition to the sensor repeater 3, if necessary, the relay for the sensor may be used. An analog fire detector having the same data transmission function as the device 3 or a control repeater for controlling a fire door or smoke emission may be connected.
[0078]
In the above-described embodiment, the disconnection detection circuit provided on the fire receiving circuit unit 15 side of the sensor repeater 3 is periodically driven by a disconnection detection control signal from the receiver, and is used when the disconnection is detected. Although the example in which the disconnection is detected by changing the voltage is shown, a disconnection detection circuit that continuously monitors the disconnection without control from the receiver 1 may be used.
[0079]
Furthermore, in the above embodiment, when a fire is detected on the sensor repeater side, a fire interrupt is issued to the receiver, and an address search for specifying the sensor repeater that has performed the fire detection based on the fire interrupt is performed. However, the present invention is not limited to this, and any transmission may be performed as long as a fire signal is transmitted prior to a response to a normal call signal.
[0080]
【The invention's effect】
As described above, according to the present invention, the transmission circuit and the CPU circuit in the sensor repeater connected to the transmission line from the receiver are electrically separated by coupling with a photocoupler between the transmission circuit and the CPU circuit. The transmission circuit side and the CPU circuit side are also separated for the transmission line from the receiver, so the number of photocouplers used for the sensor repeater is minimized, and the transmission line side and the sensor line And since the telephone line side is separated, it is possible to eliminate the problem that the call signal is hard to hear due to the superimposition of noise due to the transmission signal on the telephone line, and at the same time the external noise on the sensor line side does not superimpose on the transmission line side, It is possible to prevent adverse effects on transmission signals due to external noise.
[0081]
In addition, by providing a photocoupler in the transmission circuit section of the sensor repeater, the LEDs of the photocoupler are simultaneously driven by a call signal to a number of the sensor repeaters connected to the receiver, thereby transmitting. Although the line current of the line fluctuates greatly and the line voltage that is the power supply voltage of the transmission circuit also fluctuates, in the present invention, a constant current circuit is provided on the receiving side of the transmission circuit of the sensor repeater, and the constant current circuit is provided. Since the power of the receiving amplifier is supplied by the output of the current circuit and the LED of the photocoupler is driven by the calling signal, the current of the transmission line from the receiver does not fluctuate even when the LED of the photocoupler is driven. It is possible to prevent the transmission signals from being adversely affected by the simultaneous driving of the LEDs.
[0082]
Further, in the present invention, when the telephone is inserted into the telephone jack on the terminal side, the receiver side detects the telephone insertion connection and the relay for the sensor stops the disconnection detection operation of the sensor line. In addition to preventing noise contamination due to disconnection detection during a call, it also prevents false disconnection detection when a severe threshold is set for disconnection detection due to voltage fluctuations in the detector line due to a call signal. Can be.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a system configuration showing an embodiment of the present invention.
FIG. 2 is a block diagram showing an embodiment of the present invention together with a receiver using one of the sensor repeaters of FIG. 1 as an example;
FIG. 3 is a block diagram showing an embodiment of each circuit unit in the sensor repeater of FIG. 2;
FIG. 4 is a circuit diagram of an embodiment of a receiving circuit of a transmission circuit unit in the sensor repeater of the present invention.
FIG. 5 is an explanatory diagram of a disaster prevention monitoring system according to the present invention in which insertion of a telephone is detected and disconnection detection is stopped by a sensor repeater.
6 is a flowchart of a processing operation of a receiver transmission circuit unit in the embodiment of FIG.
FIG. 7 is an explanatory diagram of a conventional disaster prevention monitoring system.
FIG. 8 is a block diagram showing a circuit configuration together with a receiver using one of the sensor repeaters of FIG. 7 as an example;
FIG. 9 is an explanatory diagram of a disaster prevention monitoring system in which a telephone line and a telephone common line are separated.
FIG. 10 is an explanatory view of a disaster prevention monitoring system in which a CPU circuit unit and a fire receiving circuit unit are electrically separated by a photocoupler in a sensor repeater;
[Explanation of symbols]
1: Receiver
2: Transmission path
3: Repeater for sensor
4: Fire detector
5, 11: telephone jack
6, 12: Telephone
7: Monitoring control unit
8, 13: Transmission circuit unit
9: Operation display section
10: Telephone circuit
14: CPU circuit unit
15: Fire receiving circuit section
16, 17: Photocoupler
16a, 17a: LED
16b, 17b: Phototransistor
18: Receiver circuit
19: Transmission circuit
20: CPU
21: Light receiving circuit
22: Light emitting circuit
23: Memory
24: Disconnection monitoring control unit
25: A / D converter
26: Line receiving circuit
27: Amplifier
28: Insertion detection unit
30: constant voltage circuit

Claims (3)

A plurality of repeaters for sensors are connected to a transmission line drawn from the receiver, and a fire detector is connected to a detector line drawn from the repeater for sensors, and designation of a terminal address from the receiver. By calling the repeater for the sensor to collect and monitor terminal information including a fire detection signal of the fire detector, furthermore, a telephone is connected to a telephone jack on a terminal side of a telephone line drawn from the receiver. In a disaster prevention monitoring system that enables selective call connection and call communication,
From the receiver, as the transmission path, a transmission line, a transmission common line, a power line, a telephone line, a common line for the power line and the telephone line are drawn out,
The repeater for the sensor comprises a transmission circuit unit, a CPU circuit unit, and a fire reception circuit unit, and a photo that electrically separates an upstream signal and a downstream signal between the transmission circuit unit and the CPU circuit unit and exchanges them. Coupled with a coupler, a transmission line and a transmission common line from a receiver are connected to the transmission circuit unit, and a power line and a common line from the receiver are connected to the CPU circuit unit and the fire reception circuit unit side, A disaster prevention monitoring system, wherein a telephone line from the receiver is connected to one end of the telephone jack, and a telephone common line from the other end of the telephone jack is connected to a common line from the receiver. In the disaster prevention monitoring system according to claim 1, the transmission circuit section of the sensor repeater includes:
An amplifier that receives and amplifies a call signal transmitted by being superimposed on a power supply voltage from the receiver between the transmission line and the transmission common line and drives a light emitting unit of the photocoupler,
A constant current circuit that outputs a constant current using the line voltage of the transmission line and the transmission common line on which the calling signal is superimposed as a power supply,
A constant voltage circuit that converts a constant current output of the constant current circuit into a constant power supply voltage and applies the constant power output to the amplifier;
A disaster prevention monitoring system comprising: In the disaster prevention monitoring system according to claim 1,
The sensor repeater includes a disconnection detection circuit that detects disconnection of the sensor line,
The receiver, an insertion detection unit for detecting the insertion connection of the telephone to the telephone jack on the terminal side, and while the insertion detection output of the insertion detection unit is obtained, the disconnection detection circuit of the repeater for the sensor A disaster prevention monitoring system, comprising: a transmission circuit for transmitting a control signal for stopping operation.

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