JPH10334357A - Fire alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set and give an address to the prescribed number of fire sensors in the site by permitting the respective fire sensors to recognize the address based on the generation order of response signals for reception parts and storing it in a setting means. SOLUTION: The plural fire sensors 4 are connected in parallel between common line 2 and a line 3 from the reception parts of a fire receiver 1 and an inspection unit 12. The control circuits of the fire sensors 4 are provided with random number generation means storing random number lists, response means outputting the response signals by timing introduced by using the random number lists for reference signals from the reception pats and the setting means storing the addresses. The fire sensors 4 recognize the address based on the generation order of the response signals and stores them in the setting means. The fire sensors 4 can automatically and individually respond to the reception parts. The sensors themselves can discriminate them in the response order or the address which is to be set from the reception part can be transmitted to the fire sensor 4 which makes a response at first.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convenient fire alarm which can easily assign an individual address to each fire detector.

[0002]

2. Description of the Related Art Conventionally, an operation test of a fire detector has been performed by actually applying heat or smoke using a heating tester or a smoke tester depending on the type of the detector. Also, a test in which heat or smoke is directly applied takes human time and contaminates the detector, so apply a test voltage to the circuit inside the fire detector and operate the detector to perform a simulated test. There are various test methods.

[0003] Such inspection must be performed individually for each fire detector, and an individual address is set for each fire detector so that the fire receiver can individually monitor and control it.

[0004]

When a large object such as a building requires a large number of fire detectors, a so-called R-type system is adopted, and a fire receiver as a receiving unit or a distributed relay is used. The monitoring and control data is transmitted and received by sophisticated signal transmission between the device and a large number of terminal devices such as a fire detector and a repeater for a controlled device by code signals. At this time, it is necessary to individually set 100 or more addresses on the terminal side. Conventionally, at the time of manufacturing at a factory, a contact means such as a dip switch or the like is used for hardware and EE.
It is set by writing in a non-volatile memory such as a PROM as software.

[0005] In such a large-scale system, it is necessary to set a large number of addresses for each fire detector, and it is not possible to automatically assign each fire detector provided in one system or set it on the spot. .

However, since a monitoring system is configured with a receiver and a certain amount of a fire detector for a small number of rooms in a system for a house or the like, it is easier to set the address on site than fixing the address at the time of manufacture. It is preferable that the information is automatically given.

It is an object of each invention of the present application to be able to easily set an address on the spot for a predetermined number of fire detectors and to automatically assign an address.

[0008]

In view of the above, a first aspect of the present invention comprises a plurality of fire sensors connected in parallel between a common line and a line line from a receiving unit such as a fire receiver. In the fire alarm, each of the fire detectors includes a random number generating means storing a random number table, and a response for outputting a response signal at a timing derived using the random number table with respect to a reference signal from the receiving unit. Means, and setting means for storing an address, wherein each fire detector recognizes the address based on the order in which the response signals are generated and stores the address in the setting means.

Therefore, each fire detector can be automatically and individually made to respond to the receiving unit, and the fire detector which has issued the first response signal may be determined by the detector itself in accordance with the response order. The address to be set may be transmitted from the receiving unit to the sensor.

In a second aspect of the present invention, there is provided a fire alarm in which a plurality of fire detectors are connected in parallel between a common line and a line from a receiving unit such as a fire receiver. Has a response means for outputting a response signal, and a setting means for storing an address, wherein a predetermined coil and a predetermined resistance component are respectively provided immediately before a common line or a line line connected to each of the fire detectors. Being formed,
The receiving unit outputs the common line and the line line so as to change the frequency component to high and low, and outputs a response signal to each of the fire detectors individually. Based on this, the address is recognized and stored in the setting means.

Therefore, if the frequency component is changed and transmitted from the receiving unit, each fire detector automatically has an output individually, and the response signal is output to the detector having the output at that time, thereby receiving the signal. The address to be set may be transmitted from the unit, or each fire sensor may determine its own address by counting the number of response signals.

According to a third aspect of the present invention, there is provided a fire alarm in which a plurality of fire detectors are connected in parallel between a common line and a line from a receiver such as a fire receiver. Includes a response unit that outputs a response signal, a setting unit that stores an address, and a resonance frequency generation unit that connects a coil and a varicap in parallel, and the receiving unit includes the common line and A line component is output to change the frequency component to high and low, and a resonance output is generated when the frequency coincides with the resonance frequency generation means in each of the fire sensors, and the addresses are recognized in the order of generation of the resonance outputs. And storing it in the setting means.

Therefore, if the frequency component is changed and transmitted from the receiving unit, a response signal is individually generated from each fire sensor, and the address to be set may be transmitted from the receiving unit. May determine its own address by counting the number of response signals. In this case, by setting the varicap, a desired address can be easily set regardless of the connection order.

Further, a fourth invention provides a fire alarm in which a plurality of fire detectors are connected in parallel between a common line and a line from a receiving unit such as a fire receiver. Setting means for storing an address, and address generating means in which an electric circuit element corresponding to a predetermined address is replaceably arranged, and each of the fire detectors is provided with a predetermined value based on the electric circuit element. Is stored in the setting means.

Therefore, each fire detector can generate an individual voltage, electric capacity, or the like based on the electric circuit element, and can generate a reference signal from the receiving unit and individually respond to the address to be set. Alternatively, each fire sensor may determine its own address by capturing an individual voltage or the like. In this case, by selecting and setting an electric circuit element such as a resistance element or a capacitor, a desired address can be easily set regardless of the connection order.

[0016]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram schematically showing an embodiment of the system.

For example, a plurality of fire detectors 4 provided in each room or the like are connected in parallel to a power / signal line consisting of a common line 2 and a line line 3 drawn from a fire receiver 1 provided in a living room in a dwelling unit. The signal lines 2 and 3 are connected at the rear ends thereof to a terminating resistor 5.

A line switch between the fire detectors 1 of the signal lines 2 and 3 and each of the fire detectors 4 always connects and connects the common line 2 and the line line 3 to the fire receiver 1. 6
Is arranged.

Normally, each fire detector 4 is connected to the signal lines 2 and 3
The fire monitoring operation is performed by the power supply supplied from the fire receiver 1 through the switch, and when a fire is detected, the switching operation is performed to bring the signal lines 2 and 3 into a low-impedance substantially short-circuit state. The fire receiver 1 detects a substantially short-circuit state based on the switching operation and performs a fire notification operation. At this time, the fire receiver 1 performs a fire display on an outdoor indicator 10 provided and connected to the entrance of a dwelling unit, for example. When installed, the necessary fire signal is output to the living room receiver.

At the time of inspection, a connector 11 pulled out from the track changer 6 to the outside, for example, to the side of the outdoor display 10,
The checker 12 is connected to the connector. On the basis of the inspection operation from the inspection device 12, the line switch 6 outputs an inspection start output to the fire receiver 1 via the inspection output line 9, displays the inspection being performed on the fire receiver 1, and detects each fire. Disconnect the signal lines 2 and 3 to the fire detector 1 from the fire receiver 1
Connect to 2. In this state, the fire receiver 1 performs an inspection display based on the inspection start output of the line switch 6 and enables the outdoor inspection from the inspector 12. At this time, each fire detector 4 operates by the power supply voltage supplied from the checker 12 through the signal lines 2 and 3.

FIG. 2 is a schematic circuit diagram of the fire detector 4 used in the system of FIG.

The fire detector 4 is provided with a constant voltage circuit B2 for supplying a stable voltage and current using terminals C and L to which the power / signal lines 2 and 3 are connected, respectively, and for charging a resistor and a capacitor. When a fire is determined by the control circuit B3, a control circuit B3 such as an oscillating circuit (not shown) or a microcomputer that performs interrupt input to the microcomputer based on a constant, a sensor circuit B4 for detecting heat due to a fire based on the temperature characteristics of the thermistor, And a fire output circuit B1 for switching between terminals C and L to a low impedance substantially short-circuit state and for turning on a confirmation light (not shown).
A signal receiving circuit B6 for detecting an input of a pulse as a check signal from a terminal L to which an input side of the signal line 3 is connected for performing a check operation, and a check for a sensor circuit B4 based on the control of the control circuit B3 during the check operation. Test circuit B for performing operation
5, a constant current control circuit B7 for flowing a predetermined constant current between the terminals C and L for a predetermined time based on the control of the control circuit B3;
Having.

Next, the inspection operation by the control circuit B3 in the case of using a thermistor is performed by connecting a resistor in parallel to the thermistor in the sensor circuit B4, for example, in order to form a pseudo high temperature state. A temperature condition can be detected. Then, based on the result, the control circuit B3 determines that the inspection result is normal, and the fire output circuit B1
Turn on. In the above, the thermistor-type heat detector as a specific example of the fire detector 4 used in the system of FIG. 1 has been described. However, other types such as a photoelectric smoke detector and a flame detector can be used. However, at that time, it is necessary to provide necessary circuits for this system.

The entire inspection device 12 is controlled by using a microcomputer or the like, and causes the line switching device 6 to perform a line switching operation via a terminal ST, and also supplies an inspection start input to the fire receiver 1. The checker 12 includes fire detection means (not shown) for detecting a switching state between the terminals C and L, and signal transmission means (not shown) for outputting a pulse between the terminals C and L to transmit a code signal. Is provided.

Further, the line switch 6 is connected to the fire detector 1 input to the fire receiver 1 via the terminal STt and the terminal ST.
The terminal LO to each detector 4 connected to the terminal LI to the fire receiver 1 is connected to the terminal LO to the inspector 12 by switching the contact. Connected to terminal Lt. In addition, from the terminal CI connected to the common wire 2 to the terminal CO, and further, the inspection device 1
The terminal Ct from 2 is always connected.

Regarding the operation of the inspection device 12, as shown in FIG. 1, after the inspection device 12 is connected to the connector 11 from outside, the power is turned on. Then, an inspection start input is given from the line switch 6 to the fire receiver 1. And each sensor 4
The signal lines 2 and 3 are switched from the fire receiver 1 to the inspection device 12 and the signal lines 2 and 3 are disconnected from the fire receiver 1, but based on the test start input to the terminal ST,
Does not display the fire receiver 1 disconnection.

In this state, the inspection operation is started. When the inspection operation is started, the signal transmission means is operated from the inspection device 12 to start transmitting the code to the terminal L at the interval of the pulse representing the inspection signal.

At this time, each of the fire detectors 4 connected between the signal lines 2 and 3 detects a pulse by the signal receiving circuit B6 and inputs the pulse to the control circuit B3. When the own address recognized by the control circuit B3 among the fire detectors 4 is designated, the pulse signal is received.
The test circuit B5 is operated based on the control of the control circuit B3 to check the sensor circuit B4. Then, when the sensor circuit B4 is normal, the control circuit B3 of the fire detector 4 operates the fire output circuit B1 to make the signal lines 2 and 3 substantially short-circuit and emit a predetermined constant current. The checker 12 detects the substantially short-circuit state as a result of the check by a fire signal detecting means constituted by a comparator (not shown) and the like. It is possible to recognize that the inspection has not been completed. In this constant current control, the current between the terminals L and C of the checker 12 is A / D converted and taken in, and the number of responding sensors can be determined.

Then, the inspection device 12 individually performs an inspection operation on each of the fire detectors 4 in address order, and outputs the result as a fire signal for a predetermined time.

Next, a signal transmission method between the signal lines 2 and 3 in operation will be described with reference to FIGS.

The inspection device 12 connects the signal lines 2 and 3 from the terminals C and L.
FIGS. 3 and 4 show the overall structure of the signal to be transmitted in between. The checker 12 first sends a preparation signal to make each fire detector 4 recognize that transmission starts, a header signal indicating the head of the control unit, a control code signal indicating the contents of the check requested, and each fire detector. An address signal for individually designating the detectors 4 and a footer signal indicating the end of the control unit are regarded as one control unit. Send while changing. Finally, an END signal for causing each fire detector 4 to recognize the end of the transmission is transmitted. During this signal transmission, when the address signal of the control unit matches its own address, each fire detector 4 performs the check operation indicated by the control signal of the control unit at the timing Tt of the footer signal. Then, the response of the designated fire detector 4 corresponds to the next header signal (address 1).
The switching operation is performed at the timing Tr of 0 (END signal).

Next, specific forms of the transmission signals shown in FIGS. 3 and 4 are shown in FIGS. First, the preparation signal continues a steady potential for T1, for example, 1 second or more, then forms a plus-side pulse in a predetermined width T2, for example, a width of 30 ms, and continues the steady potential for T3, for example, 500 ms. In response to this preparation signal, each fire detector 4 interrupts the operation currently being processed and makes preparations for transmission. At this time, the pulse width T2 needs to be a width that can be reliably detected during the operation of the fire detector 4.

Then, the header signal and the footer signal are
T4, for example a pulse of 12 ms width and T5, for example 20
A steady potential of 0 ms is continued. The rising of the first pulse is the same for other signals, but indicates the end of the steady potential of the immediately preceding signal. The pulse of the header signal and the like corresponds to a code signal portion indicating a control code and an address described below. The pulse and the shape are different. This facilitates the distinction between the control code and the signal portion whose address is desired to be indicated.

For a code signal portion indicating a control code or an address, a pulse T6 having a width different from a pulse of a header signal or the like, for example, a pulse of 3 ms, is formed, and the time of a subsequent steady potential is defined as a width T7 indicating "0". For example, the width is set to 12 ms, or the width T8 indicating “1”, for example, 24 ms. The control code and the address are represented by the combination of "0" and "1". For example, in the control code, two bits represent various modes at the time of inspection, and the address is four bits from address 1 to address 10. Is represented.
Therefore, the code signal portion in this case is equivalent to 6 bits.

In the code signal portion shown in FIG. 5, the control code portion is "01" and the address portion is "0001", and it is specified that the fire detector at address 1 operates in the inspection mode. In the code signal part of FIG. 6, the control code part is “01” and the address part is “1010”.
It is specified that the fire detector at the address 10 is operated in the inspection mode.

The addressed fire detector 4 performs the process specified in the control code, operates the fire output circuit B 1, and responds to the checker 12. In FIG. 5, the timing of this response is as follows. In FIG. 5, the sensor 4 of the address 1 performs the inspection mode operation processing with the footer signal portion of the control unit having the address signal portion designating itself, T9 at the potential portion, for example 2
The switching operation is performed for 0 ms. The inspection device 12 detects this switching operation, and detects that the fire detector 4 of the address specified by the previous control unit has responded by using fire signal detection means (not shown).

Also, the addressed fire detector 4
Performs the process specified by the control code and responds to the checker 12, but when recognizing the address designation, activates the constant current control circuit 7 during the period of the footer signal. The timing of this response is not shown as a potential change in FIG. 5 and the like, but the constant current control between the signal lines 2 and 3 is performed, for example, for 20 ms from the fall of the footer signal pulse. At this time,
On the inspector 12 side, the current value between the terminals C and L is monitored. As a result, the checker 12 can confirm the presence of the fire detector 4 at the address specified by the control unit and the presence / absence of address duplication. If the fire detector 4 corresponding to the specified address does not exist, the constant current control is not performed, and if there are two or more fire detectors with the specified address, that is, if there is an overlap, the fire detector 4 responds. Is detected.

When the control unit as described above is transmitted from address 1 to address 10, it sends out an END signal. The END signal continues a pulse having a width of T10, for example, 12 ms, and a steady potential of T5, for example, 1 second. Each of the fire detectors 4 detects the steady state for one second or more, ends the transmission, and starts the normal fire detection operation.

Here, the fire detector 4 which is not addressed is naturally not subjected to the inspection operation, but in the present embodiment, the fire detection operation is performed. Accordingly, the fire detectors other than the target fire detector 4 can detect a fire even during the inspection period. When a fire is detected, the fire output circuit B1 is activated to perform a switching operation. Inspection device 12
The side recognizes the occurrence of a fire based on continuous fire signal detection by a fire signal detection means (not shown), terminates the inspection operation, activates the line switch 6, and connects the signal lines 2 and 3 to the fire receiver 1 To cause the fire receiver 1 to perform a fire operation such as fire notification.

The inspection mode based on the control code will be described. The normal inspection mode is represented by "01", and each fire detector 4 performs an inspection operation between the footer signal and the next header signal. By the way, the fire output circuit B1 is operated to send out a fire signal. On the other hand, "10"
Represents a detector specific mode, and each fire detector 4 outputs a fire output circuit B for, for example, 150 msec in a header signal portion.
1 is operated so that the switching of the fire detector 4 can be visually confirmed from the external appearance. That is, in the inspection mode, the designated fire detector 4 responds to the inspection device 12 with the inspection result, but the switching interval is confirmed by the inspection device 12 and the result is individually displayed on a display unit (not shown). Is displayed, but the inspection worker only needs to look at the number of the defective address, and the location of the defective fire detector requires data. Therefore, the operation time of the fire output circuit B1 is made longer so that a confirmation lamp (not shown) that is turned on can be visually checked.

It is also possible to change the purpose of the control unit by changing the pulse width of the header signal. In the present embodiment, when the pulse width of the header signal is increased to, for example, 24 ms, The fire detector 4 can be recognized as the data setting mode. In this data setting, since the signal configuration differs depending on the purpose of the inspection and the purpose, it is advantageous that the data can be distinguished by the header signal at the beginning of transmission.

Further, as a circuit configuration in the fire detector 4, a constant current control circuit and a fire output circuit may be separately provided, and a predetermined voltage is left between the signal lines 2 and 3 in the fire output circuit. It may be of a type that switches to a substantially short-circuit state. In this case, it is necessary to make the switching operation, which is a fire signal, substantially short-circuited, in distinction from the constant current control as the whole system.

In the above-described embodiment, the address is stored in a storage means such as an EEPROM provided in the control circuit B3, although not shown in detail.
An embodiment of means for setting an individual address for each fire detector 4 will be described.

As a second embodiment, FIG. 7 shows a fire detector having an address setting method by changing the resistance element.

This fire detector comprises a base 41 for wiring and the like in advance on a surface where the fire detector is installed, such as a ceiling surface, and a sensing unit 42 provided with a fire detection element and a circuit element for processing. The base 41 and the sensing unit 42 are
The blade circuit is provided on one side, and the other is provided with a blade holder, and is electrically and mechanically connected by fitting each other. The block circuit shown in FIG. Side.

Then, the terminal C and the terminal L of the base 41 are branched from the L terminal, and between the terminal and the spare terminal, as an electric circuit element,
A resistance element 43 is provided for which a predetermined number of resistance values indicating addresses are prepared. In this state, the sensing unit 4
When 2 is fitted to the base 41, it is connected to the terminal C of the base 41 via the spare terminal on the sensing unit 42 side,
Although not shown in detail, the potential of resistance division with the fixed resistance inside the sensing unit 42 is input to the control circuit B3. This potential may be taken in at any timing as required, such as when the power is turned on or when the sensing unit 42 is attached. A contact is provided so as to be based on the control circuit B3. I just need. If the address is duplicated, another address can be easily obtained by removing the sensing section 42 from the base 41 and replacing the resistance element 43. The resistance element 43 may be provided on the sensing unit 42 side. However, when the sensing unit 42 is replaced, for example, when it is defective, the resistance element 43 must be the same, which is troublesome.

In this embodiment, with respect to the fourth invention,
The control circuit B3 is an example of a setting unit, and the resistance element 43 of the base 41 is an example of an address generation unit. Further, in this embodiment, by preparing the resistive elements 43 for the addresses in advance, the address can be easily set in the field, and the change is easy. Also, here, a resistance element is used as an electric circuit element,
Other circuit elements such as a capacitor may be used. In the case of a capacitor, a charging circuit is formed and the control circuit B3 performs time measurement based on the CR time constant, and the like can be distinguished.

Next, as a third embodiment, FIG. 8 shows a fire detector having an address setting method by setting a resonance frequency from a coil and a varicap.

In this fire detector, a coil 45 and a varicap 46 are connected in parallel between terminals C and L, and a preset voltage is supplied from a microcomputer 47 which is a control circuit B3 not shown in detail in FIG. Then, a resonance frequency based on the setting of the varicap 46 is generated. This varicap 4
Reference numeral 6 denotes a so-called variable capacitance diode, which can vary the capacitance based on the width of the depletion layer, and can set the individual frequency of each sensor.

Here, the signal lines 2, 3 from the inspection device 12 side
After the setting start signal is transmitted to the power supply voltage, the frequency component is sequentially changed by adding the frequency component, so that resonance occurs at a frequency unique to each sensor, and a resonance output is given to the microcomputer 47. The microcomputer 47 having obtained the resonance output generates a response pulse between the terminals C and L. Then, the checker 12 detects the response pulse via the signal lines 2 and 3 and suspends the superposition of the frequency component, and outputs the address signal in the order of response. The fire detector 4 that has output the response pulse stores that it has output the pulse, and uses an address signal obtained thereafter as its own address. After sending this address signal, checker 1
2 sequentially changes the frequency component again from the point of interruption, and makes each fire detector 4 respond individually and sequentially. Then, each fire detector 4 stores the address in the order of response. Here, the address recognized by each fire detector 4 may be determined by counting the number of pulses generated from the setting start signal, without depending on the signal transmitted from the checker 12. In addition, the inspection device 12 can recognize the number of sensors by counting the number of pulses.

In this embodiment, the control circuit B3 is an example of a response unit and a setting unit, and the coil 45 and the varicap 46 are an example of a resonance frequency generation unit. In this embodiment, similarly to the second embodiment, when the address is duplicated, the capacity of the varicap 46 can be adjusted from outside the sensor main body, so that another address can be easily obtained. be able to. Therefore, by setting the varicap 46 to the capacity for the address, the address can be easily set at the site, and the change can be easily made.

Further, as a fourth embodiment, FIG. 9 shows a fire detector having an address setting system in which a coil and a resistance component are provided in a signal line portion to automatically set a frequency in a connection order.

In this embodiment, a coil 49 having a predetermined number of turns and a minute resistance component 50 are connected to each of the common line 2 and the line line 3 connected to each of the fire detectors 4, and these are connected in advance to each of the fire detectors. Although it may be set on the base portion of the sensor 4, it may be simply wound around a driver or the like a predetermined number of times when the signal line is connected to the base. Then, similarly to the third embodiment, after the inspection start signal is transmitted, the signal lines 2 and 3 are sent from the inspection device 12 side.
When the power supply voltage is changed by adding a frequency component to the power supply voltage, resonance occurs in order at a frequency unique to each sensor, and a resonance output can be given to a microcomputer (not shown). The microcomputer (not shown) that has obtained the resonance output similarly generates a response pulse, and the inspection device 12 detects the response pulse, suspends the superposition of the frequency component, and outputs the address signal in the order of response. The fire detector 4 that has output the response pulse stores that it has output the pulse, and uses an address signal obtained thereafter as its own address. By sequentially changing the frequency component from the checker 12 again, each fire detector 4
Are individually and sequentially responded, and the addresses are stored in the order of the responses. Here, the address recognized by each fire detector 4 may be determined by counting the number of pulses generated from the setting start signal, without depending on the signal transmitted from the checker 12. In addition, the inspection device 12 can recognize the number of sensors by counting the number of pulses.

In this embodiment, with respect to the second invention,
The control circuit B3 is an example of a response unit and a setting unit,
The coil 49 and the resistance component 50 are shown as an example. Further, different addresses can be easily set as compared with the second and third embodiments. That is, at the site, addresses can be assigned in the order of connection from the inspection device 12 without having to easily set addresses.

Finally, as a fifth embodiment, FIG. 10 and FIG. 1 show a setting operation of a fire detector having a method in which individual addresses can be automatically set by software.
1 is shown.

In this embodiment, the number of fire detectors is specifically four, and each of the detectors A, B, C,
The timing at which each of the sensors D responds to the pulse from the reference pulse from the checker 12 is individually responded based on a random number generated by software. In FIG.
When each sensor receives two reference pulses generated in the same shape, it uses a random number table stored in an internal storage unit (not shown), and detects a noise level or the last two digits of a supply voltage as a numerical value recognized by a microcomputer (not shown). , A response pulse is generated in the order of the sensor A, the sensor D, the sensor C, and the sensor B based on the random number. Since the generated pulse can be detected in each sensor, the order of the pulse generated by itself can be identified.

Then, the checker 12 generates the next reference pulse in FIG. 11, and further generates pulses in order, thereby causing each sensor to perform constant current control. In each of the sensors, the reference pulse is applied only once, and then the first pulse is generated.
Performs constant current control after the first pulse. Then, the sensor D setting the address 2 after the second pulse, the sensor C setting the address 3 after the third pulse, and finally setting the address 4 after the fourth pulse Detector B performs constant current control in order.

Here, when pulses based on random numbers as shown in FIG. 10 overlap with a very small probability, two or more sensors may recognize the same address. At this time, the constant current control is performed, and the checker 12 is connected to the signal lines C and L
The presence or absence of the overlap can be detected by taking in and discriminating the current value between them. Then, when an overlap is detected, the reference pulse shown in FIG. 10 is transmitted again to generate a random number again. By repeating this, different addresses can be set for all the sensors.

In this embodiment, with respect to the first invention,
The control circuit B3 is an example of a random number generating unit, a responding unit, and a setting unit. In this embodiment, as in the fourth embodiment, each sensor is more easily provided than in the second and third embodiments. It can be another address. That is,
At the site, addresses can be individually assigned without having to easily set addresses.

In the embodiment in which the second to fifth addresses are set, the fire detector responds without performing the operation of the first embodiment in which the address is set in the fire detector responding from the receiving unit. An inspection operation may be performed at a timing, and the result may be output as a response signal. Furthermore, if the response is performed not only by switching but also by constant current control, the simultaneous response of a plurality of sensors can be determined.

As described above, in the above embodiment, the first
According to the invention, a plurality of fire detectors 4 are connected in parallel between the common line 2 and the line line 3 from the receiving unit such as the fire receiver 1 and the inspection device 12. A random number generating means storing a random number table, a response means outputting a response signal at a timing derived using the random number table with respect to a reference signal from the receiving unit, and a setting means storing an address. In addition to the circuit B3, each fire detector 4 recognizes the address based on the order of generation of the response signal and stores the address in the setting unit.

Therefore, each fire detector 4 can be automatically and individually made to respond to the receiving unit, and the detector itself may determine according to the order of response, or the response signal may be issued first. The address to be set may be sent from the receiving unit to the fire detector 4.

According to the second aspect of the present invention, each of the fire detectors 4 is provided with a control circuit B3 including a response means for outputting a response signal and a setting means for storing an address. A predetermined coil 49 and a predetermined resistance component 50 are respectively formed immediately before the common line 2 or the line line 3 connected to the common line 2 and the reception line. It outputs so that it changes, and makes each said fire detector 4 output a response signal individually, and each fire detector 4 recognizes the said address based on the generation order of the said response signal, and stores it in the said setting means. .

Therefore, if the frequency component is changed and transmitted from the receiving unit, each fire detector 4 automatically has an output individually, and by outputting a response signal to the detector having the output at that time, The address to be set may be transmitted from the receiving unit, or each fire detector 4 may determine its own address by counting the number of response signals.

In the third aspect of the invention, each fire detector 4 includes, in the control circuit B3, a response means for outputting a response signal and a setting means for storing an address, a coil 45 and a varicap 46. And a resonance frequency generating means connected in parallel with the common line 2.
And output the line component 3 to change the frequency component to high and low, and generate a resonance output when the frequency matches the frequency by the resonance frequency generation means in each of the fire detectors 4. The address is recognized and stored in the setting means.

Therefore, if the frequency component is changed and transmitted from the receiving unit, a response signal is individually generated from each fire detector 4, and the address to be set may be transmitted from the receiving unit. The device 4 may determine its own address by counting the number of response signals. In this case, by setting the varicap 46, a desired address can be easily selected regardless of the connection order.

Further, according to the fourth aspect of the present invention, each of the fire detectors 4 includes a setting means for storing an address therein.
3, an electric circuit element such as a resistance element 43 corresponding to a predetermined address is replaceably disposed, and in each of the fire detectors 4, based on the impedance of the electric circuit element such as the resistance value of the resistance element 43. Then, a predetermined address is determined and stored in the setting means.

Therefore, an individual voltage or the like can be generated in each fire detector 4, and a reference signal can be generated from the receiving unit, and after individually responding, an address to be set can be transmitted. The sensor 4 may take in individual voltages or the like to determine its own address. In this case, the resistance element 4
By selecting and setting 3, a desired address can be easily selected regardless of the connection order.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a system.

FIG. 2 is a schematic block circuit diagram of the fire detector of FIG. 1;

FIG. 3 is a schematic diagram showing a configuration of a transmission signal used in FIG. 1;

FIG. 4 is a schematic diagram simply showing the continuation of FIG. 3;

FIG. 5 is a schematic diagram simply showing the pulse shape of FIG. 3;

FIG. 6 is a schematic diagram simply showing the pulse shape of FIG. 4;

FIG. 7 is a simple circuit diagram showing a second embodiment.

FIG. 8 is a circuit diagram showing a main part of a fire detector according to a third embodiment.

FIG. 9 is a schematic connection diagram showing a fourth embodiment.

FIG. 10 is a waveform diagram schematically showing a pulse shape according to a fifth embodiment.

FIG. 11 is a waveform diagram schematically showing a pulse shape similar to FIG. 10;

[Explanation of symbols]

 2, 3 signal line 4 fire detector 12 checker

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G08B 25/00 520 G08B 25/00 520D 25/01 25/01 D

Claims (4)

[Claims] 1. A fire alarm in which a plurality of fire detectors are connected in parallel between a common line and a line from a receiving unit such as a fire receiver. A random number generator, a response unit for outputting a response signal to the reference signal from the receiving unit at a timing derived using the random number table, and a setting unit for storing an address. A fire alarm, wherein the detector recognizes the address based on the order of generation of the response signals and stores the address in the setting unit. 2. A fire alarm in which a plurality of fire detectors are connected in parallel between a common line and a line line from a receiver such as a fire receiver, wherein a response signal is provided to each of the fire detectors. A response unit for outputting, and a setting unit for storing an address, a predetermined coil and a predetermined resistance component are respectively formed immediately before a common line or a line line connected to each of the fire detectors, The receiving unit outputs the common line and the line line so as to change the frequency component to high and low, and causes each of the fire detectors to individually output a response signal.Each of the fire detectors is based on the generation order of the response signal. And recognizing the address and storing the address in the setting means. 3. A fire alarm in which a plurality of fire detectors are connected in parallel between a common line and a line line from a receiving unit such as a fire receiver, wherein a response signal is provided to each of the fire detectors. A response unit for outputting, a setting unit in which an address is stored, and a resonance frequency generation unit in which a coil and a varicap are connected in parallel, the reception unit transmits a frequency component to the common line and the line line. It outputs so as to change the height and generates a resonance output when it matches the frequency by the resonance frequency generation means in each of the fire detectors, recognizes the address in the order of generation of the resonance outputs, and gives the setting means A fire alarm that is stored. 4. A fire alarm in which a plurality of fire sensors are connected in parallel between a common line and a line line from a receiving unit such as a fire receiver, wherein an address is stored in each of the fire sensors. Setting means, and address generation means in which an electric circuit element corresponding to a predetermined address is replaceably arranged.The fire detectors each determine a predetermined address based on the electric circuit element. And storing the information in the setting means.