JP3222719B2 - Disaster prevention monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention monitoring device for performing information processing and control of a terminal by calling from a receiver. In particular, when an abnormality such as a fire occurs, an interrupt signal is transmitted from the terminal to the receiver side. The present invention relates to a disaster prevention monitoring device that reports occurrence of an abnormality.

[0002]

2. Description of the Related Art Disaster prevention monitoring devices that perform information processing and control of a terminal by calling from a receiver and transmit an interrupt signal from the terminal when an abnormality such as a fire occurs to inform the receiver of the occurrence of an abnormality have been conventionally available. Various proposals have been made. FIG. 6 is a block diagram showing a configuration of a transmission / reception circuit on a terminal side in a conventional disaster prevention monitoring device.

As shown in FIG. 6, a transmitting / receiving circuit 46 includes a voltage change detecting circuit 47 for detecting a calling signal transmitted in a voltage mode from a receiver (not shown) via a calling line 14-1.
And a level conversion circuit 48 for converting the output of the voltage change detection circuit 47 into an MPU logic level and transmitting it to the MPU 42, and a response line 14-2 in a current mode based on a normal response signal and an interrupt signal from the MPU 42. A response current return circuit 49 that responds to the receiver via the LED, and an LED 5 that lights up and informs the outside during operation of the response current return circuit 49
0.

[0004]

In such a conventional disaster prevention monitoring device, when an interrupt signal is transmitted from a specific terminal, a normal interrupt detection process can be performed by a receiver. For example, when fires occur simultaneously at a plurality of locations, when each sensor transmits an interrupt signal all at once, FIG.
As described above, the transmission line voltage may decrease.

[0005] For this reason, a decrease in transmission line voltage makes it impossible to secure a voltage necessary for the operation of the terminal, affects transmission between the receiver and the terminal, and further reduces the power supply of the receiver. I was afraid. Therefore, it is conceivable to increase the power supply capacity of the receiver, but there is a problem that the cost is increased. The present invention has been made based on such a problem, and an object of the present invention is to reduce the voltage of a transmission line so that the system does not go down even when a plurality of terminals transmit an interrupt signal for notifying an abnormality at the same time. It is to provide a disaster prevention monitoring device that can be maintained.

[0006]

In order to achieve this object, the present invention relates to a transmission line drawn from a receiver.
Terminal having a transmitting / receiving circuit and a terminal control unit using an MPU.
Terminals are connected, and the receiver
The terminal is sequentially called by transmitting the outgoing signal, and the terminal of the terminal is called.
The call control unit receives the call signal received through the transmission / reception circuit.
Match of call address and own address
When a terminal response signal is transmitted to the receiver
To a designated time when abnormalities such as fire occur.
Interrupt signal to the receiver via the transmitting / receiving circuit.
In disaster prevention monitoring apparatus for delivering, wherein the transceiver circuit, before
A paging signal transmitted from the receiver via the transmission line
A detection circuit for detecting and outputting to the terminal control unit;
Terminal response signal and interrupt signal output from the
A return circuit for transmitting to the receiver, and a transmission line voltage,
Detects a drop near the lower limit voltage at which the system operates
A lower limit voltage detection circuit that performs
Detects that the system is near the lower limit voltage
When the signal is transmitted from the return circuit to the receiver.
And a response prohibition circuit for prohibiting output .

Further , the detection circuit operates in a voltage mode from the receiver.
Terminal control by detecting the change in the voltage of the ringing signal sent by
And the return circuit is connected to the terminal output from the terminal control unit.
Receiver in current mode based on the response signal and interrupt signal
To the lower limit voltage detection circuit.
It is also characterized by being shared on the road .

[0008]

In the present invention, when the transmission line voltage becomes close to the lower limit voltage at which the system operates due to the simultaneous transmission of an interrupt signal by a large number of terminals, the lower limit voltage detection section detects this. Since the response prohibition unit prohibits the transmission of the interrupt signal from the terminal based on the detection signal, it is possible to prevent a trouble due to the system down beforehand.

Further, since it is sufficient that the transmission line voltage is maintained to such an extent that the system does not go down, even if the lower limit voltage is detected by the lower limit voltage detector, it is not necessary to put all the terminals in the response prohibition state. The response of one or more terminals whose output is delayed among the interrupt signals having some time lag may be prohibited. Therefore, the receiver can reliably detect the occurrence of an abnormality in any situation.

[0010]

1 is an overall configuration diagram of a disaster prevention monitoring device according to the present invention. In FIG. 1, reference numeral 10 denotes a receiver, and a repeater 22, an analog sensor 28, a fire transmitter 30, and the like are connected as terminals to a transmission line 14 drawn from the receiver 10.

As the analog sensor 28, an analog heat sensor or an analog smoke sensor is used. Each terminal has a unique address. A power / signal line 24 is drawn from the repeater 22, and an on / off sensor 26 is connected through the signal line 24. Receiver 10
Transmits a call signal by polling sequentially specifying individual addresses of the repeater 22, the analog sensor 28, and the fire transmitter 30 as terminals.

The disaster prevention monitoring apparatus of the present invention employs a polling method for transmitting a response signal indicating terminal detection information at the time when the terminal receiving this call signal obtains a match between its own address and the call address. Basic. The present invention
In this polling method, when an abnormal condition that requires urgency is detected on the terminal side, an interrupt signal is transmitted to notify the receiver 10 of the occurrence of the abnormal condition. Here, since the repeater 22, the analog sensor 28, and the fire transmitter 30 are located on the terminal side with respect to the receiver 10, the following description will be made simply as a terminal.

FIG. 2 is a detailed block diagram showing one embodiment of the disaster prevention monitoring device according to the present invention. In FIG. 2, a plurality of terminals 12-1, 12-2,... Are connected to a transmission line 14 drawn from a receiver 10. The transmission line 14 can be apparently divided into a calling line 14-1 and a response line 14-2. That is, in the embodiment of the present invention, a call signal from the receiver 10 to the terminal side is transmitted in the voltage mode via the call line 14-1.

On the other hand, a response signal from the terminal to the receiver 10 is transmitted in a current mode via the response line 14-2. Control unit 3 using MPU for receiver 10
2, a display unit 34, an operation unit 36, and a sounding unit 38 are connected to the control unit 32. The control unit 32
A transmission section 40 using an MPU is provided between the transmission section 14 and the transmission path 14. Note that the control unit 32 and the transmission unit 40 are
May be configured.

On the other hand, the terminals 12-1, 12-2,..., As represented by the terminal 12-1, are a terminal control unit 42 using an MPU, a sensor unit 44, and a calling line 14-1. Receives a call signal by polling from
A transmission / reception circuit 46 for transmitting a terminal response signal to 4-2 and an interrupt signal for notifying the receiver 10 of an interrupt is provided.

The sensor section 44 is a detection section of the on / off sensor 26, the analog sensor 28, and the fire transmitter 30 shown in FIG. 1, and outputs a fire detection signal based on a specific detection principle or operation to the terminal control section. 42. In the present invention, the terminal control unit 42 is provided with the interrupt transmission unit 16 realized by the program control of the MPU. When receiving an abnormality detection output such as a fire detection output or a gas leak detection output from the sensor unit 44, the interrupt transmission unit 16
At the timing of the terminal response signal to the call signal from
It has a function of transmitting an interrupt signal via the transmission / reception circuit 46. Further, the terminal control section 42 is provided with an address setting section 52 formed by a dip switch or the like.

Here, the transmission of the interrupt signal by the terminal control unit 42 is performed in such a manner that the response current from another terminal is destroyed at the response timing to the call signal by polling so that the receiver receives, for example, all 1s. A response current giving a logic level 1 is continuously transmitted over a response period. This is called transmission of a break signal. Further, the terminal control unit 42 receives a call signal for confirming the interruption from the receiver 10 in response to the interruption notification by transmitting the interruption signal. Detailed information on whether the signal is based on the detection output of the transmitter 30, the detection output of the fire detector 26, or a pre-alarm level for starting a fire judgment specific to the analog sensor 28 is used as a terminal response signal. Send out.

The transmission unit 40 of the receiver 10 is provided with an interruption detection unit 18 corresponding to the interruption transmission unit 16 on the terminal side.
The interrupt detection unit 18 monitors a terminal response signal after transmitting a call signal to the terminal. Here, when it is detected that the terminal response signal has become a meaningless invalid signal, for example, all 1s,
It is recognized as an interrupt signal from the terminal. The transmission unit 40 has an MPU
Is provided with a call control unit 20 realized by the above program control. In the steady monitoring state, the call control unit 20 sequentially sends out call signals in which call addresses of the terminals 12-1, 12-2,... Are added to the call command.

The transmitting section 40 is provided with a specifying means 53 for specifying a terminal which has detected an abnormality by searching for a group and searching for an individual address within the group. On the other hand, when an interrupt detection output is obtained from the interrupt detection unit 18, the call control unit 20 sends a call signal including the interrupt confirmation request to the terminal side, and the call control unit 20 performs the interruption based on the terminal response signal to the interrupt confirmation request. The cause of the intrusion is decoded and the corresponding processing is performed.

For example, if the cause of the interrupt is the detection output of the fire transmitter 30, the interrupt information is transmitted to the control unit 32, and the control information discriminating unit 131 of the control unit 32 determines the level of the interrupt information. At the same time, the control device corresponding to the level is determined, the ringing unit 38 is operated by the interrupt information unit 138 to ring the bell, and then the transmission path 40 is used to call a group for specifying the abnormality detection terminal. enter.

On the other hand, if an interrupt is caused by a detection output from an analog sensor, an on / off sensor, or a gas sensor, a group call for specifying an abnormal terminal immediately without issuing a warning such as a bell ringing is performed. enter. FIG. 3 is a block diagram of a terminal transmitting / receiving circuit according to the present invention.
In FIG. 3, a transmission / reception circuit 46 includes a voltage change detection circuit 47 for detecting a call signal transmitted from the receiver 1 of FIG. 1 in the voltage mode via the call line 14-1, and an output of the voltage change detection circuit 47 to the MPU. Convert to logic level and MPU
42, a response current return circuit 49 that responds to the receiver via the response line 14-2 in a current mode based on a normal response signal and an interrupt signal from the MPU 42, and a response current return circuit. An LED 50 that lights up during the operation of 49 and notifies the outside is provided.

In addition to the above, according to the present invention, the transmission / reception circuit 46 is newly provided with a lower limit voltage detecting section 51a and a response inhibiting section 51a.
b is provided. The lower-limit voltage detection unit 51a detects the vicinity of the lower-limit voltage at which the system operates so that the transmission line voltage (S-SC voltage) does not drop too much when a large number of terminals 12 simultaneously respond to the interrupt. It is to detect.

Although the lower limit voltage detecting section 51a is shown separately from the voltage change detecting circuit 47 in FIG. 3, in practice, both can be used as shown in an embodiment to be described later. In addition, the response prohibiting unit 51b includes a lower limit voltage detecting unit 51.
The response current return circuit 49 is inhibited from responding by the lower limit voltage detection signal a. Hereinafter, a specific circuit configuration will be described.

FIG. 4 is a circuit diagram showing a first embodiment of the terminal side transmitting / receiving circuit of FIG. In FIG. 4, a lower limit voltage detector 51a also serving as a voltage change detector 47 includes a transistor (FET) Tr6, resistors R8 and R9, and a capacitor C
4. When the transmission signal is transmitted from the receiver in the voltage mode, the voltage between S and SC becomes, for example, 39.5 V at the H level and changes to 31 V at the L level. This voltage change is made between 0.6V and -8.
The change of 5 V is applied to the gate G of the transistor Tr6.

The transistor Tr6 generates an inverted conversion voltage of 0V at the H level and 3.2V at the L level at the drain D in accordance with the change of the gate voltage. Therefore, the transistor Tr1 in the output stage is turned on when the drain voltage is 0 V at the H level, generates an H level voltage (3.2 V) across the resistor R30, and the transistor Tr1 is driven at the drain voltage 3.2V at the L level. Turns off and resistor R30
Is the L level voltage (0 V), and this is the MP level.
This becomes the transmission detection signal RXD for U.

The response prohibiting unit 51b includes a transistor (FE)
T) It is composed of Tr5, resistor R7, diode D2-2, and zener diode ZD3. Transistor Tr
Reference numeral 5 denotes a cutoff in which the line voltage between the S and the SC is determined by the sum voltage (Vdg + Vf + Vz) of the drain-gate voltage Vdg of the Tr5, the forward drop voltage Vf of the diode D2-2, and the Zener voltage Vz of the Zener diode ZD3. It turns off when the voltage drops below the voltage. This cutoff voltage is S-
When the voltage between SCs decreases and the voltage obtained via the capacitor C4 becomes, for example, 7 V or less, the transistor Tr5 is cut off.

When the S-SC voltage is within the normal range, the transistor Tr5 is turned on and off by the input to the source S of the response signal TXD from the MPU. When the transistor Tr5 is turned on by the H-level response signal TXD,
The transistor Tr4 connected to the base between the connection points of the resistors R5 and R6 is turned on, and further the transistor Tr3 is turned on to flow a prescribed response current between S and SC. At this time, the LED is turned on. When the transistor Tr5 is turned off by the L-level response signal TXD, the transistors Tr4 and Tr4 are turned off.
3 turns off and stops the response current.

When the line voltage becomes equal to or lower than the specified voltage and the transistor Tr5 of the response prohibition unit 51b is cut off by transmitting the interrupt signal from the plurality of terminals, the transistor is output even if the response signal TXD is output from the MPU. Tr5 is fixed to off, and the transmission of the response current by turning on and off the transistors Tr4 and Tr3 is prohibited. The capacitor C5 connected in parallel with the Zener diode ZD3
Prevents the transistor Tr5 from being cut off before reaching a predetermined cutoff voltage due to a voltage drop of about 2 to 3V.

The transistor Tr9 is turned on by a reset signal RST (inverted logic signal) from the MPU to inhibit a current response. This prevents the response current from flowing by turning on the transistor Tr9 by the reset signal RST since the I / O state of the MPU 42 is unstable at the time of power-on start by power-on. The reset signal RST is M
It is also effective when the PU runs away.

FIG. 5 is a circuit diagram showing another embodiment of the transmission / reception circuit on the terminal side in FIG. In this embodiment, the lower limit voltage detection unit 51a and the response prohibition unit 51b of the embodiment of FIG. 4 are integrated into a voltage change detection circuit 47 to simplify the circuit configuration and stabilize the operation. The voltage change detection circuit 47
The line voltage between -SC is input to the gate of the transistor (FET) Tr6 by a circuit including the resistor R11, the capacitor C5 and the Zener diode ZD3. Transistor T
voltage of the drain D of r6 is output from changing as inverted conversion voltage of S-SC voltage, which the MPU as a transmission detection signal RX D is inverted by the inverter G.

When the line voltage between the S and SC drops below a predetermined cutoff voltage due to transmission of an interrupt signal from a plurality of terminals, the transistor Tr6 enters a cutoff state,
The transistor Tr4 is fixed off. For this reason, MPU
Response signal T X D is turned be supplied to the transistor Tr5' from, not off, transmission of the response current by the transistor Tr3 is prohibited.

If the line voltage between S and SC is within the normal range, the transistor Tr6 is turned on and the transistor Tr4 is turned on.
Can be turned on, and the response signal T X from the MPU is
The transistor Tr5 'corresponding to D is turned on and off, and a response current is sent out between S and SC by driving the transistor Tr3. Note that the terminal transmitting / receiving circuit of the present invention is not limited to the circuits of FIGS. 4 and 5, but can be realized by an appropriate circuit as needed.

[0033]

As described above, according to the present invention, even if a large number of terminals simultaneously generate an interrupt signal and the transmission line voltage drops to near the lower limit voltage at which the system operates, it does not matter. Since it is possible to maintain the following conditions, it is possible to provide a highly reliable disaster prevention monitoring device capable of reliably detecting an abnormality without shutting down the system in any abnormality occurrence situation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a disaster prevention monitoring device according to the present invention.

FIG. 2 is a detailed block diagram showing one embodiment of the disaster prevention monitoring device according to the present invention.

FIG. 3 is a block diagram showing an embodiment of a terminal transmitting / receiving circuit according to the present invention.

FIG. 4 is a circuit diagram showing a specific embodiment of the terminal transmitting / receiving circuit of FIG. 3;

FIG. 5 is a circuit diagram showing another embodiment of the terminal transmitting / receiving circuit of FIG. 3;

FIG. 6 is a block diagram showing a configuration of a transmission / reception circuit on a terminal side in a conventional disaster prevention monitoring device.

FIG. 7 is a waveform diagram showing line voltage states on the receiver side and the terminal side that have dropped due to a large number of interrupts by the terminal.

[Explanation of symbols]

 10: Receiver 12: Terminal 14: Transmission line 42: Terminal control unit (MPU) 46: Transmission / reception circuit 47: Voltage change detection circuit 49: Response current return circuit 51a: Lower limit voltage detection unit 51b: Response prohibition unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-282786 (JP, A) JP-A-63-185197 (JP, A) JP-A-3-17899 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G08B 17/00 G08B 21/00-21/24 G08B 23/00-31/00

Claims (2)

(57) [Claims] 1. A transmission line drawn from a receiver,
A terminal equipped with a terminal control unit using a transmitting / receiving circuit and an MPU is
A plurality of receivers are connected, and the receiver
The terminal is sequentially called by transmitting a signal, and the terminal control of the terminal is performed.
The control unit controls the call of the paging signal received through the transmission / reception circuit.
When a match between the outgoing address and the own address is obtained
Sending a terminal response signal to the receiver via the transmitting / receiving circuit;
At the specified timing when abnormalities such as fire occur.
Sends an interrupt signal to the receiver via the transceiver circuit
The transmitting and receiving circuit includes a calling signal transmitted from the receiver via the transmission path.
A detection circuit for detecting and outputting to the terminal control unit,
The terminal response signal and the interrupt signal output from the terminal controller are
A return circuit for transmitting to the receiver, and a transmission line voltage
Has dropped to near the lower limit voltage at which the system operates.
A lower limit voltage detection circuit for detecting,
Therefore, it is confirmed that the voltage is near the lower limit voltage for operating the system.
When detected, a signal from the return circuit to the receiver
And a response prohibition circuit for prohibiting the transmission of a message . 2. The disaster prevention monitoring device according to claim 1, wherein the detection circuit is supplied from the receiver in a voltage mode.
The incoming call signal voltage change is detected and output to the terminal control unit.
The return circuit is adapted to respond to a terminal response output from the terminal control unit.
The receiver in a current mode based on an answer signal and an interrupt signal.
And the lower limit voltage detection circuit is
A disaster prevention monitoring device, which is also used as a detection circuit .