JP2019179329A - Wireless alarm and alarm system employing the same - Google Patents

Abstract

To provide a wireless alarm which prevents an interlocked alarm function from being impaired for a long time, and an alarm system.SOLUTION: In a wireless alarm configured by accommodating inside of a housing a circuit board on which a detection circuit for detecting occurrence of a fire, a radio communication circuit and a control circuit are mounted, the circuit board comprises: a first storage unit (16B) storing a program to be executed when operating as a master station; second storage units (16A and 16B) storing a program to be executed when operating as a slave station; switch means (17) capable of selectively reading the program in the first storage unit or the program in the second storage unit; and storage means (18) capable of rewriting data storing a management table to be referenced in the case of communication by the radio communication circuit. The control circuit reads and executes the program in the first storage unit or the second storage unit, the wireless alarm is configured to be operable as the master station or the slave station.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless alarm device having a fire detection function and a wireless communication function, and an alarm system using the same, for example, a plurality of fire detectors having a wireless communication function are installed so as to be able to communicate with each other. The present invention relates to a technology effective for use in a fire alarm system.

Conventional fire alarm systems installed in buildings transmit the fire detection signal of the fire detector to the fire receiver via the district line, and the fire receiver rings the alarm bell to generate a fire. There is a fire alarm system that performs an interlocking alarm by installing a plurality of wireless alarm devices that do not have a fire receiver and have a wireless communication function so that they can communicate with each other.
Of these, in a fire alarm system including a plurality of wireless alarm devices, generally, one of the sensors is set as a parent device and the other sensors are set as child devices, and communication is performed between the parent device and the child devices. (For example, refer to Patent Document 1).

JP 2010-146356 A

In a conventional fire alarm system consisting of multiple wireless alarms, when any alarm detects a fire, an alarm is issued by a buzzer or speaker, etc., and alarm information is transmitted wirelessly to other alarms in the same group. The alarm device that sends out and receives the alarm information is configured to issue an alarm according to the setting.
In order to efficiently realize the information sharing and the linked alarm function by wireless communication as described above, a system in which any one sensor is set as a parent device and the other sensors as child devices is effective.

However, in the conventional interlocking alarm system by wireless communication including the fire alarm system of Patent Document 1, an alarm device set as a parent device is fixed. The parent device played a central role in exchanging information with all child devices. In general, the wireless alarm device serving as a parent device or a child device is driven by a battery.
Therefore, battery consumption of the alarm device set as the parent device is large, and the parent device is likely to become inoperable due to a decrease in the battery voltage earlier than the child device. And if a parent machine becomes inoperable, the interlocking alarm function of the whole system (group) will be impaired, and there exists a subject that there exists a possibility that alerting | reporting, such as a fire outbreak, may be overdue. A similar problem occurs when the master unit fails.

In addition, if a master unit fails, the alarm unit must be replaced or one of the slave units must be re-set as the master unit. There is a problem that it is necessary to perform a re-registration operation of the slave unit by performing communication with the device.
The present invention has been made paying attention to the problems as described above, and an object thereof is to provide a wireless alarm device and an alarm system in which the interlocking alarm function is not impaired over a long period of time. is there.
Another object of the present invention is to provide a wireless alarm device that does not impair the interlocking alarm function even when the alarm device of the master station breaks down, and that does not require manual resetting or re-registration. To provide an alarm system.

In order to solve the above problems, the present invention provides:
An element for detecting a change in an object to be monitored, a detection circuit for detecting a state of the target part based on a signal from the element, a wireless communication circuit for performing wireless communication, and a control circuit for controlling the detection circuit and the wireless communication circuit Is a wireless alarm device in which a circuit board mounted with is housed in a housing,
In the circuit board,
A first storage unit storing a program to be executed when operating as a master station;
A second storage unit storing a program to be executed when operating as a slave station;
A switching means that can be controlled by the control circuit to selectively read the program of the first storage unit or the program of the second storage unit;
A data rewritable storage means storing a management table to be referred to during communication by the wireless communication circuit,
The control circuit is configured to operate as a master station or a slave station by reading and executing a program in the first storage unit or the second storage unit via the switching unit.

  According to the wireless alarm device having the above-described configuration, since one alarm device can operate as a master station or a slave station for communication, any one of the alarm systems including a plurality of wireless alarm devices can be operated. By operating the alarm device as a master station, when any alarm device detects a fire, etc., it is possible to execute a linked alarm by transmitting detection information to other alarm devices by wireless communication. Even if a station alarm device fails and communication cannot be performed, the slave station alarm device can become a master station so that communication can be maintained and the interlocking alarm function will not be impaired over a long period of time. Can be.

Here, preferably, the circuit board is provided with setting means capable of setting whether to operate as a master station or a slave station during communication by the wireless communication circuit,
The control circuit is configured to operate as a master station or a slave station for communication by reading and executing the program of the first storage unit or the second storage unit according to the setting in the setting unit To do.
According to such a configuration, the alarm device set as the master station can be operated as the slave station alarm device, or the alarm device set as the slave station can be operated as the master station alarm device. Since it is not necessary to design and manufacture the alarm device and the alarm device for the slave station separately, the manufacturing cost can be reduced.

Preferably, in the management table, flag information indicating whether each of the plurality of wireless alarm devices constituting the communication group operates as a master station or a slave station includes an identification code of the wireless alarm device. Is described in correspondence with
The flag information can be rewritten by the control circuit,
The control circuit is configured to execute wireless communication according to the flag information.
According to such a configuration, when the alarm device for the master station is changed to the alarm device for the slave station, or the alarm device for the slave station is changed to the alarm device for the master station, manual resetting or resetting is performed. Communication between the master station and the slave station can be executed without performing operations such as registration.

Further preferably, when the wireless communication circuit receives a signal transmitted from a wireless alarm device of a master station, the wireless communication circuit transmits a response signal after a delay time corresponding to a timer value stored in the storage means. And
The identification code is described in ascending or descending data,
In the storage means, different timer values are described corresponding to the identification codes,
The timer value is set to a smaller value as the data in ascending or descending order is smaller.
According to such a configuration, when a plurality of slave station alarm devices are associated with one master station alarm device, one-to-one communication can be executed in order, and erroneous information transmission can be performed. It is possible to prevent information transmission without causing confusion.

Further preferably, the control circuit comprises:
When the flag information indicates a slave station and a signal transmitted from the radio alarm device of the master station cannot be received for a predetermined period, the radio alarm of the management table stored in the storage means Change the flag information corresponding to the identification code of the device to the content indicating the master station,
The switching means is configured to switch to the side capable of reading the program in the first storage unit.
According to such a configuration, when a master station alarm device fails and communication cannot be performed, a predetermined one slave station alarm device is automatically promoted to the master station alarm device. Interlocked alarms can be continued without performing registration and other work.

Preferably, the detection circuit is a fire detection circuit capable of detecting the occurrence of a fire,
The control circuit is stored in the storage means when the flag information indicates a master station and the fire detection circuit detects the occurrence of a fire or receives fire detection information from a wireless alarm device of a slave station. The fire detection information is transmitted to the wireless alarm device of another slave station with reference to the management table.
According to such a configuration, it is possible to realize a fire alarm system that includes a plurality of wireless fire alarms and performs a linked alarm.

Preferably, the control circuit has a self-diagnosis function, and when the master station recovers from a failure, confirms the presence or absence of a communication timing signal from another alarm device. The flag information in the management table is rewritten to the slave station, and the switching means is switched to the second storage unit so that the slave station program is read and executed to perform wireless communication as the slave station. Configure.
According to such a configuration, communication between the master station alarm device and the slave station alarm device is temporarily disabled due to circuit malfunction or deterioration of radio wave environment, and any of the slave station alarm devices is promoted to the master station alarm device. When the master station alarm device recovers from the failure when the communication is maintained, it can operate as a slave station alarm device, so that the area where the interlocking alarm is performed can be quickly restored.

Preferably, the circuit board includes a voltage drop detection means capable of detecting a drop in the power supply voltage,
When the control circuit detects that the voltage drop detection means has dropped to a predetermined voltage, it stops transmitting the communication timing signal, rewrites its own flag information in the management table to the slave station, and The switching means is switched to the second storage unit side so that the slave station program is read and executed to perform wireless communication as the slave station.
According to such a configuration, when a battery voltage drop is detected in the master station alarm device where battery consumption is extremely high, the master station alarm device is automatically demoted to the slave station alarm device, and any one slave station alarm device becomes the master station alarm device. Since the communication is promoted to the station alarm and the communication is maintained, it is possible to delay the time when the interlock alarm cannot be performed due to the exhaustion of the battery, as compared with the alarm system in which the master station alarm is fixed and kept operating.

Another invention of the present application is an alarm system in which a plurality of wireless alarm devices having the above-described configuration are gathered to form one communication group and are installed so as to be able to monitor different areas.
One of the plurality of wireless alarm devices is set as a master station, and the remaining wireless alarm devices are set as slave stations,
Of the remaining wireless alarm devices, one wireless alarm device rewrites its own flag information in the management table to the master station when communication with the wireless alarm device of the master station is interrupted. At the same time, the switching means is switched to the first storage section so that the program for the master station is read out and executed so that wireless communication can be executed as the master station.

  According to the alarm system having the above-described configuration, it is possible to execute information transmission without confusion, and when communication with the slave station alarm device cannot be performed due to a failure of the master station alarm device, Since any one of the slave station alarm devices is automatically promoted to the master station alarm device and maintains communication, it is possible to avoid a situation in which the interlock alarm cannot be performed due to a failure of the master station alarm device.

  According to the present invention, it is possible to realize a wireless alarm device and an alarm system in which the interlocking alarm function is not impaired over a long period of time. In addition, the realization of a wireless alarm system and alarm system that does not impair the linked alarm function even when the master station alarm device fails, and that does not require manual resetting or re-registration. There is an effect that can be.

It is a functional block diagram which shows one Embodiment of the wireless alarm device which concerns on this invention. The example of a structure of the management table memorize | stored in the memory | storage circuit of the alarm device of embodiment is shown, (A) is a figure which shows initial content, (B) shows the content after the subunit | mobile_unit shown is promoted to a main | base station. FIG. It is a timing chart which shows the operation timing at the time of communication of the alarm device of an embodiment. It is a flowchart which shows an example of the procedure of the initialization routine in the alarm device of embodiment. It is a flowchart which shows an example of the procedure of the own station determination routine in the alarm device of embodiment. It is a timing chart which shows the operation timing at the time of communication after the subunit | mobile_unit of an alarm device is promoted to a main | base station. It is a system configuration figure showing an example of an alarm system constructed using an alarm device of an embodiment. It is a flowchart which shows an example of the procedure of the parent-child change process routine in the alarm device of embodiment. FIG. 9 is a timing chart showing operation timings during communication when the parent device is promoted to the child device and the child device is promoted to the parent device in the parent-child conversion process of FIG. 8;

DESCRIPTION OF EXEMPLARY EMBODIMENTS An embodiment of a wireless alarm device to which the invention is applied and an alarm system using the same will be described below with reference to the drawings.
The wireless alarm device of the present embodiment (hereinafter simply referred to as an alarm device) includes a circuit board housed in a case formed by a main body base and an alarm device cover, and is configured to detect the occurrence of a fire or the like. It is installed on the ceiling of a building. Moreover, the alarm device of the present embodiment has a wireless communication function using radio waves as a medium, and is configured to be able to transmit and receive alarm information such as the occurrence of a fire with other alarm devices.

FIG. 1 is a functional block diagram including electronic components such as an IC mounted on the circuit board of the alarm device of the present embodiment.
As shown in FIG. 1, an alarm circuit board 10 includes a CPU (Central Processing Unit), a memory such as a ROM and a RAM, and an oscillator that operates according to a program stored in the ROM. A control circuit 11 comprising: a power supply circuit (voltage regulator) 12 that receives the voltage from the built-in battery BT and generates an operating voltage of the internal circuit including the control circuit 11; and a light receiving element disposed in the dark box. A fire detection circuit 13 that detects a fire based on the signal and a wireless communication circuit 14 that has an antenna AT and performs wireless communication with another alarm device are provided.

  Further, the circuit board 10 of the alarm device has a setting device 15 including a dip switch for setting whether to operate as a master station (master station) or a slave station (slave station), and when operating as a master station. The program can be selectively read from either the program memory 16A storing the processing program to be executed in the program, the program memory 16B storing the processing program executed when operating as a slave station, or the program memory 16A or 16B. And a storage circuit 18 composed of a rewritable EPROM or the like for storing a management table used for communication or the like. The setting device 15 may be provided with a switch for setting or designating the ID (identification code) of the own alarm device. The storage circuit 18 may store a self-diagnosis program.

Further, the circuit board 10 of the alarm device includes a display circuit 19 for turning on a lamp or the like when a fire is detected by the fire detection circuit 13, and an acoustic circuit 20 for sounding a piezoelectric sounder or a speaker.
The control circuit 11 includes a parent-child determination circuit 11a that reads the setting state of the setting device 15 and determines whether the setting is a parent station or a slave station, and controls the switching circuit 17 according to the determination result. The program corresponding to the setting can be read from the program memory 16A or 16B.

FIG. 2 shows a configuration example of the management table stored in the storage circuit 18.
As shown in FIG. 2A, the management table includes, for example, an ID column in which IDs (identification codes) that do not overlap each other, such as serial numbers serving as communication addresses, and group IDs indicating that the same communication group is configured. Column, a parent / child flag column indicating whether it is set as a master station or a slave station, a timer value column describing a timer value used in communication, and the like. Among these, the parent / child flag column is determined by reading and determining the setting state of the setting device 15 by the parent / child determination circuit 11a at the time of activation. The management table may be provided with a column describing a unique ID unique to a device used for product management or the like.

The timer value described in the timer value column is different for each alarm device, that is, the ID. Although not particularly limited, in this embodiment, a shorter timer value is assigned as the ID is smaller. In addition, the management table memorize | stored in the memory circuit 18 of each alarm device is the same, and the control circuit 11 grasps | ascertains what ID the own alarm device corresponds. The timer value may be held as an information table different from the management table in FIG. In addition, a device-specific ID column may be provided in the management table of FIG.
FIG. 2B shows the state of the management table when there is a failure in the master station (when the master station is lost). Note that “failure” includes not only a state in which the device does not operate normally but also a state in which communication is not possible due to a decrease in battery voltage or a change in radio wave environment even if the device is operating normally.

Next, the timing of wireless communication between the alarm device of the master station and the alarm device of the slave station will be described using the timing chart of FIG.
In the present embodiment, as shown in FIG. 3, the parent station alarm device (ID0) transmits a communication timing signal TS to the child station alarm devices (ID1 to IDn), and the child station receives the signal ( Timing t1). Subsequently, the alarm device (ID1) of the slave station in which the smallest timer value T1 is set transmits the response signal RS, and the master station receives the signal (timing t2). The communication timing signal TS includes a command for requesting transmission of information to the slave station, a command for instructing a linked alarm to the slave station, and if the alarm device has a self-diagnosis function, the slave station executes self-diagnosis. Command to specify

Thereafter, the alarm device (ID2) of the slave station in which the second smallest timer value T2 is set transmits the response signal RS, and the master station receives the signal (timing t3). By repeating this, the alarm device (IDn) of the slave station in which the largest timer value Tn is set transmits the response signal RS, and the series of communication ends when the master station receives the signal ( Timing tn). After that, the alarm device (ID0) of the master station transmits the communication timing signal TS to the alarm devices (ID1 to IDn) of the slave stations again, whereby the second communication is started (timing tn + 1).
When sending a response from the slave station to the master station, in addition to information on whether or not a fire has been detected, the smoke concentration / temperature of the fire personnel, status information such as the presence or absence of a failure, battery voltage drop, etc. The information corresponding to the command from is included.

Next, the initialization routine and the own station determination routine by the control circuit 11 will be described with reference to the flowcharts of FIGS.
The initialization process of FIG. 4 is started when the circuit board is powered on, and the local station determination process of FIG. 5 can be executed at predetermined intervals by, for example, timer interruption.
As shown in FIG. 4, when the initialization process is started, first, the setting state of the setting device (setting switch) 15 is read (step S1).

Then, it is determined whether the setting switch is set to the master station or the slave station (step S2). When it is determined that the setting switch is set to the master station, the process proceeds to step S3, and the switching circuit 17 is set to the master station side. Then, the master station processing program is read from the program memory 16A (step S4), and the read program is executed to start communication (step S7).
If it is determined in step S2 that the slave station is set, the process proceeds to step S5, the switching circuit 17 is switched to the slave station side, and the processing program for the slave station is read from the program memory 16B (step S2). S6) The read program is executed to start communication processing (step S7).

As shown in FIG. 5, in the own station determination process, first, it is determined whether the own station is a master station or a slave station (step S11). The presence / absence of the timing signal is determined, and if it is determined that there is no signal from the master station (YES), the process proceeds to step S13, the timer value corresponding to its own ID is read with reference to the management table of FIG. Set to.
Subsequently, the presence / absence of a timing signal generated by the master station is determined (step S14). If it is determined that there is no signal from the master station (NO), the process proceeds to step S15, and whether or not the timer set in step S13 has expired. judge. If it is determined that the time is not up (NO), the process returns to step S14 and the above determination is repeated.

  On the other hand, if it is determined in step S15 that the timer has expired (YES), the process proceeds to step S16, and the management table in FIG. Then, the local station determines whether or not it is the station with the smallest ID among the valid (live) alarm devices in the communication group (step S17), and determines that it is the station with the smallest ID (YES). Then, the process proceeds to step S18, and the management table is rewritten as shown in FIG. 2B and the switching circuit 17 is switched to the master station side. Then, the processing program for the master station is read from the program memory 16A and the read program is executed. Then, the communication process is started (step S19).

If it is determined in step S11 that the local station is a master station, the process proceeds to step S21 and the management table shown in FIG. It is determined whether or not a response is received from the station (step S22). If it is determined that no response is received (NO), the process proceeds to step S23, and a lost slave station alarm is transmitted. The slave station that has received this information can recognize the currently effective alarm device by rewriting the management table.
Note that the first time up in step S15 is the slave station with the smallest timer value (small ID) among the live alarm devices, so steps S16 and S17 are omitted. It is also possible. In addition, according to the above flowchart, after the master station is demoted to a slave station, if the original master station has the smallest ID in the group, the new slave station may become the master station again. In addition, the largest ID may be assigned to the initial master station.

In FIG. 2 (B), when the original master station (ID = 00) fails and the alarm device with ID = 01, which is the station with the smallest ID among the plurality of slave stations, is changed to the master station. A management table is shown. The parent / child flag in the management table is deleted for the failed master station. Therefore, when the failed master station recovers from the failure, it is possible to perform warning in its own monitoring area, but wireless communication with other alarm devices cannot be performed, so that it does not participate in the linked alarm.
However, if the alarm device has a self-diagnosis function and is configured to recognize that it has recovered from a failure, the presence or absence of a communication timing signal from another alarm device will If there is a communication timing signal, the parent / child flag is rewritten to the slave station, the switching circuit 17 is switched to the program memory 16B side, and the slave station program is read and executed. You may comprise so that wireless communication may be performed.

FIG. 6 shows the timing of wireless communication between alarm devices when the master station (ID = 00) breaks down and the alarm device with ID = 01, which is the slave station with the smallest ID, changes to the master station. Yes.
As shown in FIG. 6, when the alarm timing (ID0) of the master station fails and the communication timing signal TS is not transmitted from the master station, the slave station side transmits the transmission timing signal TS transmitted from the master station. When the timer starts counting from the transmission start time (timing t11) and the master station lost is confirmed (master station timing signal lost), the alarm is changed from the slave station to the master station at the time t12 when the predetermined time Tid required for setting has elapsed. The communication timing signal TS is transmitted from the device ID1 to the other slave stations (ID2 to IDn), and the signal is received by the slave station. The predetermined time Tid is different for every ID, and the value may be a value correlated with the ID or may be stored in the management table in advance.

  Thereafter, the alarm device (ID2) of the slave station in which the second smallest timer value is set transmits the response signal RS, and the master station receives the signal (timing t13). Subsequently, the alarm device (ID3) of the slave station in which the third smallest timer value T3 is set transmits the response signal RS, and the master station receives the signal (timing t14). By repeating this, the alarm device (IDn) of the slave station in which the largest timer value Tn is set transmits the response signal RS, and the series of communication ends when the master station receives the signal ( Timing tn). Thereafter, the alarm device (ID1) of the master station transmits the communication timing signal TS to the alarm devices (ID2 to IDn) of the slave stations again, whereby the second communication is started (timing tn + 1).

Next, a preferred embodiment in the case of constructing a fire alarm system using a plurality of alarm devices having the configuration and functions as described above will be described.
FIG. 7A shows an initial state immediately after the construction of the fire alarm system. Here, six alarm devices are respectively installed in a predetermined monitoring area. In the case of such a layout, the alarm device 10A located at the center is set as a master station. This is because good wireless communication can be performed with all other alarm devices.
For the other alarm devices 10B to 10F, the alarm device (10B in the figure) next to the center of the layout next to the alarm device 10A is set as the slave station 1 (= ID1) having the smallest timer value. Similarly, the slave station 2, the slave station 3, the slave station 4, and the slave station 5 are set in order from the alarm device closest to the layout center.

  In the fire alarm system set as described above, if the alarm device 10A as the master station fails and wireless communication with the slave station cannot be performed, the alarm device that is the slave station 1 with the smallest timer value 10B first detects the lost of the master station, and as shown in FIG. 7B, it is promoted to the master station by its own judgment and transmits the communication timing signal TS to the alarm devices 10C to 10F which are the slave stations. To do. In a system in which a plurality of alarm devices having a conventional wireless communication function are arranged, communication between alarm devices is interrupted when a master station fails, but in a system in which an alarm device to which this embodiment is applied is arranged. As can be seen from FIG. 7B, good wireless communication can be continuously performed between the alarm devices 10B to 10F excluding the master station.

In the above description using FIG. 5 to FIG. 7, the wireless communication can be continued when the master station breaks down. For example, when the battery of the master station is exhausted, the parent's status is abandoned. Any of the slave stations may be changed to the master station so that wireless communication can be continued.
FIG. 8 shows an example of a flowchart of a parent-child switching process of a program executed by the master station to realize such a function. The flowchart of the program executed by the slave station may be the same as the flowchart shown in FIG.

  When the flowchart of FIG. 8 is started, the control circuit (CPU) 11 of the master station first reads the battery voltage of its own power supply circuit 12 (step S31). Subsequently, it is determined whether or not the read battery voltage is equal to or lower than a predetermined value (step S32). If it is determined that the battery voltage is equal to or lower than the predetermined value (YES), the process proceeds to step S33 to stop transmission of the communication timing signal. To do. Then, after rewriting the parent / child flag in the management table and setting the timer value to the shortest value in the group (step S34), the switching circuit (switch) 17 is switched to the slave station side (step S35). Thereafter, the slave station processing program is read from the program memory 16B, and the read program is executed to start communication processing (step S36).

On the other hand, in the alarm device on the slave station side, if the master station abandons the parent's position and changes to a slave station as described above, it receives the communication timing signal from the master station as if the master station failed. Therefore, by executing the flowchart of FIG. 5, the slave station having the smallest timer value is promoted to the master station and wireless communication can be continued.
Note that the “predetermined voltage” in step S32 is selected to be a voltage value that does not hinder the execution of warning, although the life of the battery is considerably reduced and frequent radio communication is impossible. Thereby, although battery voltage falls and it cannot participate in an interlocking alarm, the alert of its own monitoring area can be implemented continuously.

In FIG. 9, the battery voltage of the master station (ID = 00) decreases to switch to a slave station, and the alarm device with ID = 01, which is the slave station with the smallest ID, changes to the master station. The timing of wireless communication is shown in FIG.
As shown in FIG. 9, when the parent station alarm device (ID0) battery voltage decreases and the communication timing signal TS is not transmitted from the parent station, the slave station transmits a transmission timing signal transmitted from the parent station. The timer starts counting from the TS transmission start time (timing t11), and when the master station lost is confirmed (master station timing signal lost), it changes from the slave station to the master station at a time t11 when a predetermined time Tid required for setting has elapsed. The communication timing signal TS is transmitted from the alarm device ID1 to the alarm device ID0 changed from the master station to the slave station and the other slave stations ID2 to IDn, and the slave station receives the signal (timing t12).

  Thereafter, the alarm device (ID0) of the former master station set to the smallest timer value transmits the response signal RS, and the alarm device (ID1) changed to the master station receives the signal (timing t13). Subsequently, the alarm device (ID2) of the slave station in which the second smallest timer value T2 is set transmits the response signal RS, and the alarm device (ID1) changed to the master station receives the signal (timing) t13). By repeating this, the alarm device (IDn) of the slave station in which the largest timer value Tn is set transmits the response signal RS, and the series of communication ends when the master station receives the signal ( Timing tn).

As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the thing of the said embodiment. For example, in the above embodiment, it has been described that the smallest timer value is set in the alarm device (ID0) that has changed from the master station to the slave station due to a decrease in battery voltage, but the largest timer value is set. Also good.
In the above-described embodiment, the alarm device is described assuming that it has a fire detection function by smoke detection having a light emitting element and a light receiving element, but the present invention is not limited thereto, and a pyroelectric element that detects infrared rays, The present invention can be widely used in an alarm system using an alarm device in which an element such as a thermal sensor such as a thermistor, a gas sensor for detecting harmful gas such as CO, or a human sensor is mounted.

10A to 10F Alarm 10 Circuit board of alarm 11 Control circuit 12 Power supply circuit 13 Fire detection circuit 14 Wireless communication circuit 15 Setter 16A, 16B Program memory 17 Switching circuit 18 Storage circuit

Claims (9)

An element for detecting a change in an object to be monitored, a detection circuit for detecting a state of the target part based on a signal from the element, a wireless communication circuit for performing wireless communication, and a control circuit for controlling the detection circuit and the wireless communication circuit Is a wireless alarm device in which a circuit board mounted with is housed in a housing,
In the circuit board,
A first storage unit storing a program to be executed when operating as a master station;
A second storage unit storing a program to be executed when operating as a slave station;
A switching means that can be controlled by the control circuit to selectively read the program of the first storage unit or the program of the second storage unit;
A data rewritable storage means storing a management table to be referred to during communication by the wireless communication circuit,
The control circuit is configured to operate as a master station or a slave station by reading and executing a program in the first storage unit or the second storage unit via the switching unit. Wireless alarm. The circuit board is provided with setting means capable of setting whether to operate as a master station or a slave station during communication by the wireless communication circuit,
The control circuit reads and executes the program in the first storage unit or the second storage unit according to the setting in the setting means, and can operate as a master station or a slave station for communication. The wireless alarm device according to claim 1. In the management table, flag information indicating whether each of the plurality of wireless alarm devices constituting the communication group operates as a master station or a slave station is described corresponding to the identification code of the wireless alarm device. And
The flag information can be rewritten by the control circuit,
The wireless alarm device according to claim 1, wherein the control circuit performs wireless communication according to the flag information. The wireless communication circuit is configured to transmit a response signal after a delay time corresponding to a timer value stored in the storage means when receiving a signal transmitted from a wireless alarm device of a master station,
The identification code is described in ascending or descending data,
In the storage means, different timer values are described corresponding to the identification codes,
4. The wireless alarm device according to claim 3, wherein a smaller value is set as the timer value is smaller in ascending order or descending order data. 5. The control circuit includes:
When the flag information indicates a slave station and a signal transmitted from the radio alarm device of the master station cannot be received for a predetermined period, the radio alarm of the management table stored in the storage means Change the flag information corresponding to the identification code of the device to the content indicating the master station,
5. The wireless alarm device according to claim 4, wherein the switching means is configured to switch to a side capable of reading a program stored in the first storage unit. The detection circuit is a fire detection circuit capable of detecting the occurrence of a fire,
The control circuit includes:
The management table stored in the storage means when the flag information indicates a master station and the fire detection circuit detects the occurrence of a fire or receives fire detection information from a wireless alarm device of a slave station The wireless alarm device according to any one of claims 3 to 5, wherein the fire alarm information is transmitted to a wireless alarm device of another slave station with reference to FIG.   The control circuit has a self-diagnosis function. When the master station recovers from a failure, the control circuit checks the presence or absence of a communication timing signal from another alarm device. The self-flag information is rewritten to the slave station, and the switching unit is switched to the second storage unit side to read and execute the program for the slave station to perform wireless communication as the slave station. The wireless alarm device according to any one of claims 1 to 6. The circuit board includes a voltage drop detection means capable of detecting a drop in power supply voltage,
When the control circuit detects that the voltage drop detection means has dropped to a predetermined voltage, it stops transmitting the communication timing signal, rewrites its own flag information in the management table to the slave station, and 8. The wireless communication system according to claim 1, wherein the switching unit is switched to the second storage unit to read out and execute a program for a slave station and perform wireless communication as a slave station. The wireless alarm device described in 1. A plurality of wireless alarm devices according to any one of claims 1 to 8 constitute one communication group, and is an alarm system installed so that different areas can be monitored,
One of a plurality of wireless alarm devices is set as a master station, and the remaining wireless alarm devices are set as slave stations.
Of the remaining wireless alarm devices, one wireless alarm device rewrites its own flag information in the management table to the master station when communication with the wireless alarm device of the master station is interrupted. In addition, the alarm system is configured to switch the switching means to the first storage unit side, read and execute a program for a master station, and execute wireless communication as a master station.

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