JP4944804B2 - Fire alarm system - Google Patents

Description

  The present invention relates to a fire alarm system in which a plurality of fire alarm devices transmit and receive radio signals using radio waves as a medium.

Conventionally, there is a fire alarm system as described in Patent Document 1. This fire alarm system has a function that multiple fire alarms installed in multiple locations sense fire and sound an alarm sound, and if any fire alarm senses a fire, By transmitting the information (fire detection information) that informs the fire detection to the other fire alarm with the radio wave as a medium, the fire alarm sounds only with the fire source fire alarm. In addition, a plurality of fire alarms can be interlocked to sound an alarm sound all at once, so that the occurrence of a fire can be notified quickly and reliably.
JP 2006-343983 A

  By the way, when linking multiple fire alarms, not only when an alarm sound is sounded in response to a fire detection as described above, for example, when the alarm sound of each fire alarm is There are cases where the ringing stops. At this time, if radio signals including a fire recovery message are transmitted almost simultaneously from a plurality of fire alarms, there is a risk that a collision will occur and reception will fail. On the other hand, while multiple fire alarms are sounding in conjunction with each other, it is ensured by periodically (intermittently) transmitting a radio signal that instructs each fire alarm to sound the alarm sound. It is desirable to make an alarm sound.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a fire alarm system capable of effectively interlocking a plurality of fire alarm devices while avoiding collision of radio signals. .

  In order to achieve the above object, the invention of claim 1 is a fire alarm system comprising a plurality of fire alarms and transmitting a radio signal using radio waves as a medium between the plurality of fire alarms, When a fire alarm is detected by a fire detection means, a fire detection means for detecting a fire, a warning means for informing a fire alarm, a transmission means for transmitting a radio signal, a reception means for receiving a radio signal, and a fire detection means Causes the alarm means to notify the fire alarm and causes the other fire alarm to transmit a radio signal including a fire alarm message for notifying the fire alarm from the transmitting means, and is transmitted from the other fire alarm by the receiving means. Control means for notifying a fire alarm to a warning means when receiving a fire alarm message by receiving a radio signal, and including a fire warning message from any fire alarm When the signal is transmitted, the control means of the specific fire alarm device that has received the radio signal causes the transmission means to transmit a synchronization signal of a certain period, and the reception is received by all fire alarm devices including the specific fire alarm device. After the time when the synchronization signal can be received by the means, the control means stores the radio signal in a specific time slot assigned to itself among the plurality of time slots defined by the synchronization signal, and the transmission means The specific fire alarm control means includes a fire alarm message in the synchronization signal periodically transmitted from the transmission means, and other fire alarm control means excluding the specific fire alarm are at least While receiving the fire alarm message included in the synchronization signal, the alarm means continuously notifies the fire alarm.

  According to the first aspect of the present invention, after fire alarms are started to be notified by all fire alarms, all other fire alarms are placed in a plurality of time slots defined by a synchronization signal transmitted by a specific fire alarm. By assigning and performing wireless communication using time division multiple access, collisions can be avoided, and in addition, a fire alarm message is included in the synchronization signal from a specific fire alarm to all other fire alarms. It is possible to reliably notify the fire alarm by transmitting to. As a result, a plurality of fire alarms can be effectively interlocked while avoiding radio signal collision.

  According to a second aspect of the present invention, in the first aspect of the invention, in any one of the fire alarms other than the specific fire alarm, the fire detection means detects a fire, and the wireless signal including the fire alarm message is transmitted from the transmission means. When transmitted, the control means of the specific fire alarm device sends a radio signal including the fire alarm message from the transmission means to all other fire alarm devices except the fire alarm device that is the source of the fire alarm message. It is characterized by transmitting.

  According to the invention of claim 2, it is possible to reliably link all the fire alarms by arranging a specific fire alarm at a position where wireless communication is possible with all other fire alarms. it can.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the control means of the specific fire alarm device includes a radio signal including a fire alarm stop message instructing to stop the fire alarm when a predetermined condition is satisfied. Is transmitted from the transmission means to another fire alarm.

  According to invention of Claim 3, the alerting | reporting of the fire alarm in all the other fire alarms can be stopped from the specific fire alarm.

  According to a fourth aspect of the present invention, in the invention of the third aspect, an operation input receiving means for receiving an operation input for manually stopping a fire alarm is provided in each fire alarm, and the predetermined condition is a specific fire alarm. Fire alarm stop transmitted by radio signal from the other fire alarm that has received the operation input of fire alarm stop by the operation input reception means provided, or the operation input of fire alarm stop was accepted by the operation input reception means This message is that the specific fire alarm control means has received this message.

  According to the invention of claim 4, it is possible to stop fire alarms in all other fire alarms by simply stopping the fire alarm of any of the fire alarms manually.

  According to a fifth aspect of the present invention, in the third aspect of the present invention, the predetermined condition is that the control unit is configured such that in the fire alarm that has detected a fire with the fire detection unit, the fire detection unit no longer detects the fire. Transmits a radio signal including an alarm stop message for stopping the fire alarm to the transmission means, receives the radio signal by the reception means of the specific fire alarm device, and the control means of the specific fire alarm device outputs the alarm stop message. It is characterized by having received.

  According to invention of Claim 5, the fire alarm in all the fire alarms can be stopped automatically at the time of fire restoration.

  The invention of claim 6 is the invention according to any one of claims 1 to 5, wherein the control means of the specific fire alarm device transmits a synchronization signal including a message to be sent to another fire alarm device from the transmission means. It is characterized by that.

  According to the invention of claim 6, a message can be reliably transmitted from a specific fire alarm to another fire alarm.

  According to the present invention, a plurality of fire alarms can be effectively interlocked while avoiding collision of radio signals.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram of this embodiment, and a fire alarm system is configured by a plurality of (only two in the drawing) fire alarm devices TR. In the following description, when the fire alarm devices TR are individually shown, they are expressed as fire alarm devices TR1, TR2,..., TRn, and when collectively shown, they are expressed as fire alarm devices TR.

  The fire alarm TR transmits a radio signal using radio waves as a medium from the antenna 3 and receives a radio signal transmitted from another fire alarm TR by the antenna 3, and a sound (buzzer sound or voice message). Etc.), the alarm unit 5 for notifying (sounding from the speaker) a fire alarm (hereinafter referred to as “alarm sound”), and the alarm unit 5 when a fire is detected by the fire detection unit 4 using a microcomputer as a main component. A control unit 1 that causes a radio signal including a fire alarm message to be sent to the other fire alarm device TR and a fire alarm message to be transmitted to another fire alarm device TR, and an alarm sound to be output as will be described later An operation input receiving unit 6 that receives an operation input for stopping the operation and a battery power supply unit 7 that supplies an operating power to each unit using a battery such as a dry battery as a power source. The operation input receiving unit 6 has one or more switches (for example, push button switches). When the switch is operated, an operation input corresponding to each switch is received and an operation signal corresponding to the operation input is controlled. Output to part 1. A unique identification code is assigned to each fire alarm device TR1, TR2,..., And the destination of the radio signal and the fire alarm devices TR1, TR2,.

  The radio transmission / reception unit 2 transmits / receives a radio signal using radio waves as a medium in accordance with “specific low-power radio stations” defined in Article 6 of the Radio Law Enforcement Regulations. In addition, the fire detection unit 4 detects fire by detecting smoke, heat, flames, and the like generated with the fire, for example. However, detailed configurations of the wireless transmission / reception unit 2 and the fire detection unit 4 are well known in the art and will not be described in detail.

  The control unit 1 realizes various functions to be described later by executing a program stored in the memory with a microcomputer. When the fire detection unit 4 detects the occurrence of a fire, the control unit 1 drives a buzzer included in the alarm unit 5 to sound an alarm sound, or an alarm voice message (stored in a memory or the like in advance) ( For example, in order to notify the fire alarm by causing the speaker to sound “fire”, etc., and to notify the fire alarm also in other fire alarm devices TR, a wireless signal including a fire alarm message is transmitted from the wireless transmission / reception unit 2. Send it. Also, when the wireless transmission / reception unit 2 receives a wireless signal transmitted from another fire alarm device TR, the control unit 1 controls the alarm unit 5 to sound an alarm sound. That is, in the control unit 1, when the fire detection unit 4 detects a fire, the alarm unit 5 sounds an alarm sound to notify the fire alarm, and the wireless transmission / reception unit 2 transmits a radio signal including the fire alarm message. Have.

  Here, the “specified low-power radio stations” prescribed in Article 6 of the Radio Law Enforcement Regulations mainly stipulate radio equipment for low-power security systems that carry out reports of fire, theft, and other abnormalities, or control associated therewith. In addition, there is a “low-power security system radio equipment radio equipment standard (Radio Industry Association Standard RCR STD-30)”, and in this standard, radio signals may be transmitted continuously (transmission The period (period) is 3 seconds or less, and the period during which the wireless signal should not be transmitted (pause period) provided between the transmission period and the transmission period is defined as 2 seconds or more. For this reason, the control unit 1 according to the present embodiment transmits a radio signal during a transmission period that conforms to the standard, stops transmission during a pause period, and enables reception.

  Further, in order to extend the battery life of the battery power supply unit 7 as much as possible, the control unit 1 repeatedly counts a predetermined intermittent reception interval (however, the intermittent reception interval is longer than the transmission period) with a timer built in the microcomputer. In addition, every time the intermittent reception interval is counted, the wireless transmission / reception unit 2 is activated to check whether a desired radio wave (radio signal transmitted by another fire alarm device TR) can be received, and the radio wave is captured. If not, the average power consumption is greatly reduced by immediately stopping the wireless transmission / reception unit 2 and shifting to the standby state. The radio wave reception check is performed based on the received signal strength indication signal (Receiving Signal Strength Indication: RSSI signal) output from the wireless transmission / reception unit 2 and is a DC voltage signal proportional to the magnitude of the received signal strength. The details are well known in the art and will be omitted.

  Further, the control unit 1 of a specific fire alarm device TR1 (hereinafter referred to as a master station) activates the wireless transmission / reception unit 2 periodically (for example, every 25 hours) to provide other fire alarm devices TR2, TR3,. (Hereinafter, referred to as a slave station) transmits a radio signal including a confirmation message to confirm whether or not it is operating normally (life and death confirmation), and switches the radio transmission / reception unit 2 to the reception state. There is a slave station that does not transmit a radio signal including a response message within a predetermined time after receiving a radio signal including a response message transmitted from the fire alarm device TR2, ... and transmitting a radio signal including a confirmation message. For example, it has a function of notifying the slave station that an abnormality (battery has run out) has occurred by driving a buzzer included in the alarm unit 5 to sound a notification sound.

  In addition, the control unit 1 of the master station detects a fire when the fire detection unit 4 detects a fire and causes the alarm unit 5 to sound an alarm sound and transmits a fire alarm message to each slave station, or sends a fire alarm message from any slave station. After reception, the wireless transmission unit 2 is caused to transmit a synchronization signal at a constant period. This synchronization signal is a signal that defines a time slot necessary for performing TDMA (time division multiple access) wireless communication between a plurality of fire alarms TR, and one cycle is a plurality of times. Each of the slave stations is assigned one time slot that is different from each other. Then, a message from the master station to the slave station is included in the synchronization signal and transmitted, and a radio signal including a message from the slave station to the master station is stored in the time slot assigned to each slave station and transmitted. . Therefore, it is possible to reliably avoid collision of radio signals transmitted from a plurality of fire alarm devices TR (master station and slave station). The time slot assignment for each fire alarm device TR may be fixed, but the time slot assignment information may be notified to each slave station by a synchronization signal transmitted from the master station.

  FIG. 2 shows a data format of a radio signal transmitted and received by the fire alarm device TR. A synchronization bit (preamble: PA), a frame synchronization pattern (unique word: UW), a destination address DA, a source address SA, a message M, One frame is composed of a CRC code. Here, if the identification code of each fire alarm device TR is set as the destination address DA, only the fire alarm device TR of the identification code receives a radio signal and acquires a message. By setting a special bit string that is not assigned to the fire alarm TR (for example, a bit string with all bits set to 1), a wireless signal is broadcast (multicast) to obtain a message for all the fire alarm TRs. Can be made. For example, a radio signal including a fire alarm message is broadcast from the master station to all the slave stations. The control unit 1 transmits the radio signal for one frame from the radio transmission / reception unit 2 continuously in a number that can be transmitted within one transmission period when the radio signal is transmitted asynchronously. When transmitting and receiving data in the TDMA system, it is not necessary to store a plurality of frames of radio signals in one time slot.

  Next, referring to the time chart of FIG. 3, the transmission / reception operation of the present embodiment when shifting to the TDMA wireless communication will be described.

  For example, when the fire detection unit 4 detects a fire in the slave station TR2, the control unit 1 of the slave station TR2 sounds an alarm sound from the alarm unit 5 and activates the wireless transmission / reception unit 2 to transmit a radio signal including a fire alarm message. It transmits to all other fire alarm devices TR (master station TR1 and other slave stations TR3,...). At this time, the control unit 1 of the transmission source slave station TR2 continuously transmits the radio signal by the number of frames that can be transmitted within the transmission period, and the radio transmission / reception unit 2 during the pause period (reception period) after the transmission period. To the receiving state. Here, each fire alarm device TR asynchronously receives intermittently. However, if a transmission period of a certain number of times (for example, three times) is repeated, a radio signal including a fire alarm message can be received.

  Here, if the specific low-power radio is used, the wireless communication distance can be sufficiently covered within an area of a normal house, so that the fire source child station TR2 can receive another fire alarm TR (master station TR1). It is usually possible to send a message to the other slave stations TR3,. However, as described above, the master station TR1 periodically checks the life and death of each of the slave stations TR2 to TR5, and the normality of the communication path is confirmed between the master station TR1 and each of the slave stations TR3 to TR5. However, since the communication path between the slave stations TR2 to TR5 has not been confirmed, there is a possibility that a message does not reach a certain slave station due to the influence of an obstacle, for example.

  Therefore, the control unit 1 of the master station TR1 that has received the fire alarm message continuously transmits a radio signal including the fire alarm message to the other slave stations TR3 to TR5 other than the source slave station TR2 a plurality of times. . When the control unit 1 of the other slave stations TR3 to TR5 receives the fire alarm message transmitted from the slave station TR2 or the master station TR1, it immediately sounds an alarm sound from the alarm unit 5 and confirms the acknowledgment (ACK) from the radio transceiver unit 2. ) In addition, when all of the fire alarms TR notify the fire alarm (sounds an alarm sound) when a fire is detected by at least one fire alarm TR in this manner, hereinafter, it is referred to as “fire interlocking”. .

  When receiving the ACK from all the other slave stations TR3 to TR5, the control unit 1 of the master station TR1 causes the radio transmission / reception unit 2 to transmit a synchronization signal for defining a time slot at a constant period. In this embodiment, the first time slot TS1 is the child station TR2, the second time slot TS2 is the child station TR3, the third time slot TS3 is the child station TR4, and the fourth time slot TS4 is the child. Assigned to station TR5.

  Here, the master station TR1 periodically checks the life and death of each of the slave stations TR2 to TR5, and the normality of the communication path is confirmed between the master station TR1 and each of the slave stations TR3 to TR5. The communication path between the slave stations TR2 to TR5 has not been confirmed. Therefore, when a large number of slave stations TR2,... Are arranged, the number of communication paths between the slave stations TR2,. Since the exhaustion becomes intense, as described above, the specific fire alarm device TR1 is set as the master station, and the other fire alarm devices TR2,. By notifying a message (to be described later), even if there are slave stations that cannot establish a communication path with each other, it is possible to reliably link the fire.

  Further, when the interlocking is started by sounding an alarm sound from all the fire alarm devices TR, a synchronization signal is transmitted from the master station TR1 at a constant cycle as described above, and the operation shifts to TDMA communication. The control unit 1 of the master station TR1 repeatedly transmits a fire warning message to all the slave stations TR2,. Then, the control unit 1 of each slave station TR2,... Checks the state of the alarm unit 5 every time it receives a fire alarm message transmitted from the master station TR1, and if the alarm unit 5 is stopped, the alarm unit 5 Sound the alarm again. Therefore, after the fire alarm is started to be notified by all the fire alarms TR, all the other fire alarms (children) are set in a plurality of time slots defined by the synchronization signal transmitted by the specific fire alarm (master station) TR1. Stations) TR2,... Can be assigned to perform wireless communication by time division multiple access (TDMA) to avoid collisions. Furthermore, all other fire alarms from a specific fire alarm (master station) TR1 The fire alarm can be reliably notified to the slave stations TR2,. As a result, a plurality of fire alarms TR can be effectively interlocked while avoiding collision of radio signals.

  By the way, the fire alarm system of this embodiment is in a state where no fire is detected in any of the fire alarms TR (standby state), and in a state where all the fire alarms TR are sounding an alarm sound (linked sounding) State), as described later, only the fire alarm TR that detects the fire (fire source) sounds the alarm sound, and the fire alarm TR other than the fire source stops the alarm sound (interlocked) The operation state is transited between (stop state). That is, when a fire is detected by at least one of the fire alarm devices TR in the standby state, as described above, the fire alarm is sent from the fire slave station TR2 and the master station TR1 to all the other slave stations TR3,. When the message is transmitted, an alarm sound is generated in all the fire alarm devices TR including the master station TR1 and the slave stations TR2,.

  When an operation input for stopping the alarm sound is received by the operation input receiving unit 6 of any fire alarm device TR in the interlocking sounding state, if the fire alarm device TR is the master station TR1, The station TR1 transmits a message (alarm stop message) requesting stop of the alarm sound to all the slave units TR2,..., Or if the fire alarm device TR is the slave station TR2,. When the master station TR1 receives the alarm stop message from the stations TR2,... And transmits the alarm stop message to the other slave stations TR2,. Transition to the stop state. However, when an operation input for stopping the alarm sound is received by the operation input receiving unit 6 of the fire source fire alarm device TR, the alarm sound is also stopped in the fire alarm device TR of the fire source. Here, the control unit 1 of the master station TR1 keeps the fire detection status of the master station TR1 and each slave station TR2,... Updated as needed in a memory (not shown), and all the fire alarms TR as will be described later. When a fire is no longer detected in, transition from the fire-linked state to the standby state.

  When the interlocking ringing state is changed to the interlocking stop state, the control unit 1 of the master station TR1 starts a time limit for a predetermined alarm sound stop time (for example, 5 minutes). Then, after the alarm sound stop time has elapsed, the control unit 1 of the master station TR1 refers to the fire detection status held in the memory, and if all the fire alarms TR have not detected fire, When a recovery notification message is sent, a transition is made from a fire-linked state to a standby state, and if a fire is detected by at least one fire alarm TR, the fire is stopped by sending a fire alarm message using a synchronization signal. Transition from state to linked ringing state. Even when any fire alarm device TR newly detects a fire in the interlock stop state, the control unit 1 of the master station TR1 transmits a fire alarm message by a synchronization signal to change from the interlock stop state to the interlock ringing state. Transition.

  For example, as shown in the time chart of FIG. 4, in a fire-linked state (linked ringing state) in which the master station TR1 is a fire source, an operation input for stopping an alarm sound is received by the operation input reception unit 6 of the slave station TR4 that is not a fire source. When the alarm stop message is transmitted from the slave station TR4 by being accepted, the control unit 1 of the master station TR1 that has received the alarm stop message transmits the alarm stop message M2 by the synchronization signal and sets the time limit of the alarm sound stop time. Do. However, in the master station TR1 that is the source of fire, the alarm unit 5 continues to sound an alarm sound. After the alarm sound stop time has elapsed, the control unit 1 of the master station TR1 confirms the fire detection status of its own fire detection unit 4 and the fire detection status of the slave stations TR2,..., And at least one of the fires is detected. When the alarm device TR detects a fire, the fire alarm message is transmitted again to each of the slave stations TR2,.

  On the other hand, as shown in the time chart of FIG. 5, if the fire is extinguished within the warning sound stop time and the fire detection unit 4 stops detecting the fire, the control unit 1 of the master station TR1 After a lapse of time, a recovery notification message is transmitted to each slave station TR2,... By a synchronization signal, and when an ACK returned from all the slave stations TR2,. Is stopped from wireless communication using the TDMA method (hereinafter referred to as “synchronous communication”) to wireless communication using intermittent transmission and reception (hereinafter referred to as “asynchronous communication”).

  Further, as shown in the time chart of FIG. 6, if the fire at the fire station extinguishes and the fire detection unit 4 of the slave station TR 4 does not detect the fire in the interlocking ringing state with the slave station TR 4 as the fire source, A recovery notification message is transmitted from the station TR4 to the parent station TR1. The control unit 1 of the master station TR1 that has received the recovery notification message refers to the fire detection status held in the memory, and if no fire is detected by all the fire alarms TR, the recovery notification message M3 is sent by a synchronization signal. It transmits to each slave station TR2,. When the control unit 1 of the master station TR1 receives ACKs returned from all the slave stations TR2,..., Transitions from the interlock stop state to the standby state, and stops the transmission of the synchronization signal, thereby stopping the asynchronous communication from the synchronous communication. Return to.

  On the other hand, as shown in the time chart of FIG. 7, when a fire is newly detected by another fire alarm device (for example, the slave station TR3), a recovery notification message is received from the slave station TR4 that is the first fire source. The control unit 1 of the master station TR1 refers to the fire detection status held in the memory, and since the slave station TR3 is detecting a fire, it does not send a recovery notification message and continues to send a fire alarm message. Maintain a fire-linked condition.

  Here, the processing performed by the control unit 1 of the master station TR1 in the fire-linked state is briefly summarized with reference to the flowchart of FIG. When a fire alarm message is received from any of the slave stations TR2,... In the standby state (step S1), the control unit 1 of the master station TR1 updates the fire detection status held for each slave station TR2,. (Change from fire non-detection to fire detection) (step S2) On the other hand, if a recovery notification message is received from the fire slave station TR2,... (Step S3), the fire detection status of the slave station TR2,. Update from detection to non-fire detection (step S4). When a recovery notification message is not received from any of the slave stations TR2,... In the fire interlocking state, when the alarm stop message is received from any of the slave stations TR2,... (Step S5), the control unit 1 of the master station TR1 issues an alarm. Is determined to be stopped and a synchronization signal including an alarm stop message is transmitted from the wireless transmission / reception unit 2 (step S6). Also, an alarm stop message is periodically transmitted by a synchronization signal from the transition from the interlocking sounding state to the interlocking stop state until the alarm sound stop time elapses (steps S7, S8, S6), and the alarm sound stop time. (Step S8), it is determined whether or not the fire alarms (master station TR1 and slave stations TR2,...) That are detecting fire remain by referring to the fire detection status held in the memory (step S8). S9) If at least one fire alarm is still being detected, it is determined that the fire interlocking is continued and a synchronization signal including a fire alarm message is transmitted from the wireless transceiver 2 (step S10). If the fire alarm is not fire-detected, the recovery from the fire-linked state to the standby state is determined, and a synchronization signal including a recovery notification message is transmitted from the wireless transmission / reception unit 2 (step S11).

  Thus, in the present embodiment, the control unit 1 of the specific fire alarm device (master station TR1) sends a message (alarm stop message) transmitted from other fire alarm devices (slave stations TR2,...) By synchronous communication. And the recovery notification message) and the timing of switching from the linked ringing state to the linked stop state, the linked ringing state, or the linked stop state to the standby state. The fire alarm device TR can be linked more effectively.

It is a block diagram of a fire alarm device (master station and slave station) in an embodiment of the present invention. It is a data format of the radio signal in the same as above. It is a flowchart for demonstrating the operation | movement which changes to a fire interlocking state from a standby state same as the above. It is a time chart for demonstrating the operation | movement which changes to the interlocking stop state from the interlocking ringing state same as the above. It is a time chart for demonstrating the operation | movement which changes to the interlocking stop state from the interlocking ringing state same as the above. It is a time chart for demonstrating the operation | movement which changes to a standby state from a fire interlocking state same as the above. It is a time chart for demonstrating the operation | movement in a fire interlocking state same as the above. It is a flowchart for demonstrating operation | movement of the master station in a fire interlocking state same as the above.

Explanation of symbols

TR1 Fire alarm (master station)
TR2 Fire alarm (slave station)
1 Control unit (control means)
2 Wireless transmission / reception unit (reception means, transmission means)
4 Fire detection part (fire detection means)
5 Alarm section (alarm means)
6 Operation input reception unit (operation input reception means)

Claims (6)

A fire alarm system comprising a plurality of fire alarms and transmitting a radio signal using radio waves as a medium between the plurality of fire alarms,
Each fire alarm detects a fire with a fire detecting means for detecting a fire, an alarm means for notifying a fire alarm, a transmitting means for transmitting a wireless signal, a receiving means for receiving a wireless signal, and a fire detecting means. Sometimes the alarm means is notified of the fire alarm and the radio signal including the fire alarm message for notifying the other fire alarm device of the fire alarm is transmitted from the transmitting means, and the receiving means is transmitted from the other fire alarm device. Control means for notifying the alarm means when receiving the fire alarm message and receiving the fire alarm message,
When a wireless signal including a fire alarm message is transmitted from any fire alarm, the control means of the specific fire alarm device that has received the wireless signal causes the transmitting means to transmit a synchronization signal of a certain period, and In all fire alarms including fire alarms, after the synchronization signal can be received by the receiving means, the control means is assigned to itself among a plurality of time slots defined by the synchronization signal. Store the radio signal in a specific time slot and transmit it from the transmission means,
The control means of the specific fire alarm device periodically transmits the synchronization signal including the fire alarm message from the transmission means,
A fire alarm characterized in that the control means of other fire alarms excluding a specific fire alarm continuously notify the fire alarm from the alarm means while receiving the fire alarm message included in the synchronization signal system.   If the fire detection means detects a fire in any other fire alarm except a specific fire alarm and a wireless signal including a fire alarm message is transmitted from the transmission means, the control means of the specific fire alarm is The fire alarm according to claim 1, wherein a radio signal including a fire alarm message is transmitted from a transmission means to all other fire alarms except the fire alarm which is a transmission source of the fire alarm message. system.   The control means of a specific fire alarm is to transmit a radio signal including a fire alarm stop message instructing the stop of the fire alarm to another fire alarm from the transmission means when a predetermined condition is satisfied. The fire alarm system according to claim 1 or 2, characterized by the above. Each fire alarm is provided with an operation input acceptance means for accepting manual fire alarm stop operation input,
The predetermined condition is that an operation input receiving unit provided in a specific fire alarm has received an operation input for stopping a fire alarm, or other operation input for receiving a fire alarm stopped by an operation input receiving unit. 4. The fire alarm system according to claim 3, wherein the control means of the specific fire alarm device has received a fire alarm stop message transmitted by a radio signal from the fire alarm device.   The predetermined condition is a radio including an alarm stop message for the control means to stop the fire alarm when the fire detection means stops detecting the fire in the fire alarm that has detected the fire by the fire detection means. The signal is transmitted to the transmission means, the wireless signal is received by the reception means of the specific fire alarm device, and the control means of the specific fire alarm device receives the alarm stop message. The described fire alarm system.   The fire alarm system according to any one of claims 1 to 5, wherein the control means of the specific fire alarm device causes the transmission means to transmit a synchronization signal including a message to be sent to another fire alarm device. .

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