JP5075014B2 - 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.

  In recent years, since the obligation to install fire alarms in houses has become legal, a fire alarm system that links a plurality of fire alarms using radio signals is desired from the viewpoint of workability in existing houses. Such a fire alarm system has a function in which a plurality of fire alarms installed in many places sense a fire and sound a warning sound, and if any fire alarm senses a fire, By transmitting information (fire detection information) that informs fire detection to other fire alarms by radio signal, the fire alarm sounds the alarm sound, and not only the fire source fire alarm but also multiple fires An alarm device can be linked to sound an alarm sound all at once, so that the occurrence of a fire can be notified quickly and reliably (see, for example, Patent Document 1). Such a fire alarm is driven by a battery as a power source in order to take advantage of the characteristic of transmitting fire detection information by radio signal, and is usually in a place where maintenance (battery replacement) is difficult such as indoor ceilings. Since it is installed, it is desirable that it can be used without maintenance for a long period of time such as several years.

Here, in the fire alarm system as described above, when a fire is detected, a wireless signal is transmitted between a plurality of fire alarms. At that time, each fire alarm is arbitrarily (asynchronously). ) When wireless signals are transmitted, the wireless signals collide. As a means for avoiding such a collision, for example, Patent Document 2 describes a fire alarm system in which a plurality of fire alarm devices transmit radio signals by a TDMA (Time Division Multiple Access) method. In the conventional example described in Patent Document 2, each fire alarm device stores and transmits a radio signal in a time slot assigned to itself, so that the above-described collision can be avoided.
JP 2008-4033 A JP 2006-343983 A

  By the way, the fire alarm in the fire alarm system as described above functions as a “small power radio station” defined in Article 4 item 3 of the Radio Law, and its antenna power is 0.01 watt or less. Therefore, wireless communication may become impossible between some fire alarms due to the influence of obstacles and noise. In such a case, a repeater that relays a radio signal between fire alarms that cannot perform direct wireless communication is usually installed.

  However, in a system in which a plurality of fire alarms transmit radio signals by the TDMA (Time Division Multiple Access) method as in the conventional example described in Patent Document 2, when a repeater is simply added, It is necessary to shift in time the time slot in which the fire alarm device that is not the relay target is accommodated and the time slot in which the fire alarm device that is the relay target is accommodated. For example, when the period of the synchronization signal that defines the former time slot and the period of the synchronization signal that defines the latter time slot are the same period, the period of these two synchronization signals is shifted by half a period, and each synchronization signal A time slot is provided only in the first half of the period. Therefore, the time required for the radio signal transmitted from the fire alarm to be relayed to be relayed by the repeater and received by another fire alarm is almost doubled compared to the case without the repeater. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fire alarm system capable of relaying a radio signal in substantially the same time as when no repeater is provided.

  In order to achieve the above object, the invention of claim 1 provides a plurality of fire alarms for transmitting a radio signal using radio waves as a medium, and a radio signal transmitted from any one of the fire alarms as any other Each fire alarm has a fire detecting means for detecting a fire, an alarm means for notifying a fire alarm, a transmitting means for transmitting a radio signal, and receiving a radio signal. When a fire is detected by the receiving means and the fire detecting means, the alarm means is notified of the fire alarm and the other fire alarm device is made to transmit a radio signal including a fire alarm message for notifying the fire alarm, from the transmitting means, And a control means for receiving a radio signal transmitted from another fire alarm by the receiving means and receiving the fire alarm message when the fire alarm message is received, and any one of the fire alarms When a radio signal including a fire alarm message is transmitted, the control means of the specific fire alarm device that has received the radio signal transmits a radio signal including a fire alarm message to all other fire alarm devices from the transmission means. And transmitting the first synchronization signal from the transmission means and transmitting the first synchronization signal from the transmission means of the specific fire alarm in all other fire alarms except the specific fire alarm. Is started, the control means stores the radio signal in a specific time slot assigned to itself among the plurality of time slots defined by the first synchronization signal, and transmits the radio signal from the transmission means. Is transmitted from a fire alarm that is registered in advance among the transmitting means for transmitting a radio signal, the receiving means for receiving a radio signal, and the other fire alarms. When the receiving means receives the wireless signal including the fire alarm message, the transmitting means transmits the wireless signal including the fire alarm message, and the receiving means receives the first synchronization signal transmitted from the specific fire alarm. A repeater control means for storing a radio signal in a specific time slot assigned to itself among a plurality of time slots defined by one synchronization signal and transmitting it from the transmission means, When the first synchronization signal transmitted from the specific fire alarm is received by the reception unit, the second synchronization signal having the same cycle as the first synchronization signal is transmitted from the transmission unit, and in the fire alarm to be relayed, After the transmission of the second synchronization signal is started from the transmission means of the repeater, a plurality of time slots defined by the second synchronization signal by the control means A radio signal is stored in a specific time slot assigned to itself and transmitted from the transmission means, and a time slot defined by the first synchronization signal and a time defined by the second synchronization signal The slots are synchronized and different time slots are assigned to all other fire alarms including the fire alarm to be relayed.

  According to the first aspect of the present invention, the time slot defined by the first synchronization signal transmitted from the specific fire alarm and the time slot defined by the second synchronization signal transmitted from the repeater overlap in time. Therefore, it is possible to relay a radio signal in almost the same time as when there is no repeater.

  According to a second aspect of the present invention, in the first aspect of the invention, the repeater control means transmits a second synchronization signal in synchronization with a leading time slot among a plurality of time slots defined by the first synchronization signal. The second time slot following the head time slot is assigned and transmitted by the means.

  According to the invention of claim 2, the time slot in which the repeater transmits the second synchronization signal to the fire alarm to be relayed and the time slot in which the repeater transmits a radio signal to the specific fire alarm are provided. Since it is continuous in time, the conditions of the transmission period and the suspension period specified by the law can be satisfied.

  According to the present invention, it is possible to relay a radio signal in substantially the same time as when there is no repeater.

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

  FIG. 2 is a system configuration diagram of the present embodiment, and a fire alarm system is configured by a plurality (six in the illustrated example) of fire alarms TR and one relay RY. 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.

  As shown in FIG. 3A, the fire alarm device 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 device TR or the relay device RY by the antenna 3. A wireless transceiver 2, an alarm unit 5 for reporting a fire alarm (hereinafter referred to as “alarm sound”) by sound (such as a buzzer sound or voice message), and a fire detection system including a microcomputer as a main component When the unit 4 senses a fire, the alarm unit 5 is caused to sound an alarm sound and the radio transceiver unit 2 transmits a radio signal including a fire alarm message for notifying other fire alarms TR of the fire alarm. As will be described later, the control unit 1, an operation input receiving unit 6 that receives an operation input for stopping ringing of an alarm sound, etc., and battery power for supplying operating power to each unit using a battery such as a dry battery It is and a part 7. 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. Each fire alarm device TR1, TR2,... Is assigned a unique identification code at the manufacturing stage and stored in storage means (ROM not shown).

  The radio transmission / reception unit 2 transmits / receives a radio signal using radio waves as a medium in accordance with “radio station of low power security system” defined in Article 6, Paragraph 4, Item 3 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, in the radio equipment regulation Article 49-17 “Radio equipment of radio stations of the low power security system” of the Radio Law Enforcement Regulation, the period during which radio signals may be continuously transmitted (transmission period) is 3 seconds or less. A period (pause period) provided between the transmission period and the transmission period in which the radio signal should not be transmitted is defined as 2 seconds or more. For this reason, in the control unit 1 in the present embodiment, the wireless signal is transmitted during the transmission period that complies with the wireless facility rules, and the transmission is stopped and received during the suspension period.

  In order to make the battery life of the battery power supply unit 7 as long as possible, the control unit 1 repeatedly counts a predetermined intermittent reception interval by a timer built in the microcomputer and starts the wireless transmission / reception unit 2 every time the intermittent reception interval is counted. Then, it is checked whether or not a desired radio wave (a radio signal transmitted by another fire alarm device TR or a repeater RY) can be received. The average power consumption is greatly reduced by shifting to. 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, in the control unit 1 of a specific fire alarm device TR1 (hereinafter referred to as a master station), the wireless transmission / reception unit 2 is activated periodically (for example, every 24 hours), and the other fire alarm devices TR2 to TR6 (hereinafter referred to as “fire alarm devices”). In order to confirm whether or not the slave station is operating normally (periodic monitoring), a wireless signal including a periodic monitoring message is transmitted. In the slave stations TR2,..., The control unit 1 monitors whether or not the fire detection unit 4 has failed and whether or not the battery power supply unit 7 has run out of battery at regular intervals (for example, every hour), and the monitoring result ( The presence / absence of a failure and the presence / absence of a battery are stored in a memory (not shown), and when a periodic monitoring message is received from the master station TR1, a radio including a notification message for notifying the monitoring result stored in the memory A signal is returned to the master station TR1. After transmitting the radio signal including the notification message, the control unit 1 of the master station TR1 switches the radio transmission / reception unit 2 to the reception state and receives the radio signal transmitted from each fire alarm device TR2,. There is a slave station TR2, ... that does not send a radio signal containing a notification message within a predetermined time after sending a radio signal containing the message, or there is a failure in a notification message sent by any of the slave stations TR2, ... Alternatively, when the result of monitoring that the battery has run out is to be notified, the slave station TR2,... Malfunctions by driving a buzzer provided in the alarm unit 5 to sound a notification sound (communication is disabled or there is a fault, the battery is dead Etc.) has also been reported. When the control unit 1 of the master station TR1 and the slave stations TR2,... Determines that a failure or a battery has run out, a warning sound for immediately informing the occurrence of an abnormality (failure or battery runout) from the alarm unit 5. (Buzzer sound, voice message, etc.) are sounded from the speaker of the alarm unit 5.

  Further, the control unit 1 of the master station TR1 detects the fire and causes the alarm unit 5 to sound an alarm sound and transmits a fire alarm message to each of the slave stations TR2,..., Or any of the slave stations TR2. After receiving the fire alarm message from,..., The wireless transmission unit 2 is caused to transmit a synchronization signal (first synchronization signal) B1 at a constant period. The first synchronization signal B1 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 (one cycle) thereof. Are divided into a plurality of time slots TS1, TS2,..., TSn, and different time slots TS1, TS2,. Then, a message from the master station TR1 to the slave station TR2,... Is included in the first synchronization signal B1, and a radio signal including a message from the slave station TR2,. And stored in the time slot TSm (m = 1 to n) assigned to the relay RY and transmitted. Therefore, it is possible to reliably avoid collision of radio signals transmitted from the plurality of fire alarm devices TR (the master station TR1 and the slave stations TR2,...) And the repeater RY. Note that the allocation of the time slot TSm to each fire alarm device TR and the repeater RY is performed at the time of registration of the slave stations TR2,.

  As shown in FIG. 3B, the repeater RY transmits a radio signal using radio waves as a medium from the antenna 12, and receives a radio signal transmitted from the fire alarm TR by the antenna 12, and a microcomputer. Repeater control unit 10 whose main components are, an operation input receiving unit 13 that receives an operation input for registration and the like, which will be described later, and a power supply unit that is supplied with power from a commercial AC power supply AC and creates an operating power supply for each unit 14. The wireless transmission / reception unit 11 transmits / receives a wireless signal using a radio wave as a medium in accordance with “radio station of low power security system” defined in Article 6, Paragraph 4, Item 3 of the Radio Law Enforcement Regulations. The operation input receiving unit 13 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 relayed. To the controller 10. It should be noted that a unique identification code is also assigned to the repeater RY at the manufacturing stage and stored in a storage means (ROM not shown).

  Here, in the present embodiment, as shown in FIG. 2, among the five slave stations TR2 to TR6, the three slave stations TR2 to TR4 are installed in a place where direct radio communication with the master station TR1 is possible. Since the remaining two slave stations TR5 and TR6 are installed in a place where direct radio communication with the master station TR1 is not possible, the two slave stations TR5 and TR6 and the master station TR1 are allowed to perform radio communication. It is relayed by the repeater RY. Hereinafter, the group to which the master station TR1 and the slave stations TR2 to TR4 that can directly communicate with the master station TR1 belong is referred to as a main group MG, and the group to which the repeater RY and the relay target slave stations TR5 and TR6 belong is defined as a sub group. It will be called a group SG. The repeater RY belongs to both the main group MG and the sub group SG, and behaves like a slave station in the main group MG and behaves like a master station in the sub group SG.

  The repeater control unit 10 receives the radio signal transmitted from the slave stations TR5 and TR6 belonging to the subgroup SG by the radio transmission / reception unit 11 and causes the radio transmission / reception unit 11 to transmit the radio signal toward the main group MG. When the wireless transmission / reception unit 11 receives the asynchronous relay process and the first synchronization signal B1 transmitted from the master station TR1, the second synchronization signal B2 having the same cycle as the first synchronization signal is directed from the wireless transmission / reception unit 11 to the subgroup SG. When the wireless transmission / reception unit 11 receives the synchronization signal relay process to be transmitted and the wireless signal transmitted and stored in the time slot defined by the second synchronization signal B2 by the slave stations TR5 and TR6 belonging to the subgroup SG will be described later. As described above, the radio signal is stored in the time slot TS2 (or TS4) defined by the first synchronization signal B1, and is transmitted from the radio transmission / reception unit 11 to the master station TR1. A synchronous relay process for transmitting the message transmitted by the master station TR1 using the first synchronization signal B1 from the wireless transmission / reception unit 11 to the slave stations TR5 and TR6 belonging to the subgroup SG using the second synchronization signal B2; Periodic monitoring is performed for the slave stations TR5 and TR6 belonging to the SG, and a periodic monitoring result of the slave stations TR5 and TR6 is returned to the master station TR1 when a radio signal including a regular monitoring message is received from the master station TR1. Execute the monitoring agency process.

  FIG. 4 shows a frame format of a radio signal transmitted and received by the fire alarm device TR or the repeater RY, and includes a synchronization bit (preamble: PA), a frame synchronization pattern (unique word: UW), a header HD, data Data, and a CRC code. One frame is configured. The header HD includes an identification code (hereinafter referred to as “parent station ID”) of the master station TR1 in the main group MG, a count value RC of a later-described registration counter, a source address SA, and a destination address DA. The subgroup SG includes an identification code of the relay RY (hereinafter referred to as “relay ID”), a count value RC of a registration counter, which will be described later, a transmission source address SA, and a transmission destination address DA.

  Here, if a device number (to be described later) assigned to each fire alarm device TR is designated as the destination address DA, only the fire alarm device TR of that device number receives the radio signal and acquires data (message). However, by setting a special bit string (for example, a bit string with all bits set to 1) different from any device number as the destination address DA, all the fire alarms are broadcast (multicast). The message can be acquired by the TR. For example, a radio signal including a fire alarm message is broadcast from the master station TR1 or the repeater RY to all the slave stations TR2,. 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. 5, 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. Send (multicast). 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. Note that each fire alarm device TR is intermittently received asynchronously, but a radio signal including a fire alarm message can be received if the transmission period is repeated a certain number of times (for example, twice).

  Here, if the low-power radio is used, the wireless communication distance can be sufficiently covered as long as it is within an area of a normal house. Therefore, the fire source child station TR2 can connect other fire alarm devices TR (master station TR1 and master station TR1). It is usually possible to send a message to other slave stations TR3,. However, as described above, the master station TR1 regularly monitors the slave stations TR2 to TR4 belonging to the main group MG, and the communication path is normal between the master station TR1 and each of the slave stations TR3 and TR4. However, since the communication path between the slave stations TR2 to TR4 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 wirelessly transmits a radio signal (frame) including the fire alarm message N times continuously to all the slave stations TR2 to TR4 belonging to the main group MG. While transmitting / receiving from the transmission / reception unit 2, the wireless transmission / reception unit 2 is switched to the reception state after the N times of transmission. When the control unit 1 of the slave stations TR3 and TR4 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 receives the fire alarm message from the wireless transceiver unit 2. A response message (ACK) to be confirmed is returned by a radio signal. 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”. .

  Here, when each slave station TR2,... Receiving the fire warning message from the master station TR1 returns a radio signal including a response message asynchronously, the radio signals transmitted from the plurality of slave stations TR2,. If the master station TR1 does not reach the station TR1 and repeats the retransmission of the fire alarm message, the battery may be exhausted earlier, or the switching from asynchronous communication to synchronous communication, which will be described later, may be delayed. Therefore, the control unit 1 of the master station TR1 stores the order i (i = 1, 2,..., N) of the frame at the head of the message M in each radio signal (frame). In the control unit 1 of..., The timing at which the radio transmission / reception unit 2 of the master station TR1 switches from the transmission state to the reception state is estimated based on the order i stored in the message M of the received radio signal. That is, assuming that the frame length of one frame is Tf [seconds], when Tf × (N−i) [seconds] has elapsed from the end of the received wireless signal, the wireless transmission / reception unit 2 of the master station TR1 is in a transmission state. Can be estimated to switch to the receiving state.

  Then, the period during which the radio transmission / reception unit 2 of the master station TR1 is switched to the reception state is divided into M time slots, and time slots k (k = 1, 2,...) Determined for each slave station TR2,. .., M), if a radio signal including a response message is stored and returned from each slave station TR2,... To the master station TR1, collision of radio signals including a response message transmitted from the slave station TR2,. be able to. In FIG. 5, each of the slave stations TR2, TR3, TR4 stores a radio signal including a response message in time slots 1, 2, 3, and sends it back to the master station TR1.

  When receiving the ACK from all the slave stations TR2 to TR4 belonging to the main group MG, the control unit 1 of the master station TR1 transmits a radio signal including a relay start message to the repeater RY. Since the repeater RY is always supplied with power from the commercial AC power supply AC, the repeater RY is always in a receiving state except when a regular monitoring message is transmitted to the slave stations TR5 and TR6 belonging to the subgroup SG. Therefore, the radio signal including the relay start message transmitted from the master station TR1 is immediately received by the radio transmission / reception unit 11 of the repeater RY, and the repeater control unit 10 that has received the relay start message receives the control unit of the master station TR1. 1, a wireless signal including a fire alarm message and storing the order i (i = 1, 2,..., N) of the frame at the beginning of the message M is transmitted from the wireless transmission / reception unit 11 continuously N times. Then, after the N times of transmission, the wireless transmission / reception unit 11 is switched to the reception state.

  In the control unit 1 of each of the slave stations TR5 and TR6 belonging to the subgroup SG, the self-transmission unit 11 of the repeater RY switches itself to a reception state among a plurality of time slots divided into M times. A radio signal including a response message (ACK) is stored in the assigned time slot k (k = 1, 2,..., M) and returned to the repeater RY.

  When receiving the ACK from all the slave stations TR5 and TR6 belonging to the subgroup SG, the repeater control unit 10 of the repeater RY sends a response message (ACK) for notifying the master station TR1 of completion of relay preparation. The wireless signal included is transmitted from the wireless transmission / reception unit 11.

  When the control unit 1 of the master station TR1 receives the response message from the relay RY, the control unit 1 causes the radio transmission / reception unit 2 to transmit the first synchronization signal B1 for defining the time slot at a constant period. In the present embodiment, the first time slot TS1 and the second time slot TS2 are assigned to the repeater RY as described later.

  Here, the master station TR1 (and the repeater RY) regularly monitors each of the slave stations TR2 to TR6, and communication is performed between the master station TR1 (and the repeater RY) and each of the slave stations TR2 to TR6. The normality of the path is confirmed, but the communication path between the slave stations TR2 to TR6 is not 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.

  On the other hand, when the repeater control unit 10 of the repeater RY receives the first synchronization signal B1 transmitted from the master station TR1, as shown in FIG. 1, the repeater control unit 10 sets the first time slot TS1 defined by the first synchronization signal B1. The second synchronization signal B2 is stored and transmitted from the wireless transmission / reception unit 11. Here, the second synchronization signal B2 has the same period as the first synchronization signal B1, and a plurality of time slots defined by the second synchronization signal B2 and a plurality of time slots defined by the first synchronization signal B1. TSn is synchronized. Further, different time slots TS are assigned to the slave stations TR2 to TR4 belonging to the main group MG and the slave stations TR5 and TR6 belonging to the subgroup SG, and the system includes the main group MG and the subgroup SG. TDMA synchronous communication can be performed as a whole.

  When all the fire alarms TR start sounding by alarm sound, as described above, the first synchronization signal B1 is transmitted from the master station TR1 at a constant cycle, and the communication shifts to TDMA communication. However, the control unit 1 of the master station TR1 repeatedly transmits a fire alarm message to all the slave stations TR2,... At a predetermined period by including it in the first synchronization signal B1. 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 fire alarms are started to be notified by all fire alarm devices TR, all other fire alarms are provided in a plurality of time slots defined by the first synchronization signal B1 transmitted by the specific fire alarm device (master station) TR1. Can be avoided by assigning devices (slave stations) TR2,... To perform wireless communication by time division multiple access (TDMA), and from the specific fire alarm (master station) TR1 to all other The fire alarm can be reliably notified by periodically transmitting the fire alarm message to the fire alarm devices (slave stations) TR2,. As a result, a plurality of fire alarms TR can be effectively interlocked while avoiding collision of radio signals.

  Here, two time slots TS1 and TS2 are allocated to the repeater RY, and the repeater control unit 10 transmits the second synchronization signal B2 to the radio transmission / reception unit 11 in the first time slot TS1. A radio signal including a message for the master station TR1 is transmitted to the radio transmission / reception unit 11 in the time slot TS2. The repeater control unit 10 includes the fire alarm message in the second synchronization signal B2 transmitted in the first time slot TS1 while receiving the fire alarm message repeatedly transmitted from the master station TR1. The fire alarm message is relayed to the slave stations TR5 and TR6 belonging to SG. Therefore, the fire alarm message is periodically transmitted not only to the slave stations TR2 to TR4 belonging to the main group MG but also to the slave stations TR5 and TR6 belonging to the sub group SG, so that the fire alarm is surely notified. Can do.

  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 the stop of the alarm sound to all the slave stations 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 audible alarm stop time has elapsed, the control unit 1 of the master station TR1 refers to the fire detection status held in the memory. If all the fire alarms TR have not detected a fire, the first synchronization When a recovery notification message is sent by signal B1, the fire-linked state transitions to the standby state, and if a fire is detected by at least one fire alarm TR, a fire alarm message is sent by the first synchronization signal B1. Sending a transition from the linked stop state to the linked ringing state. Even if any fire alarm 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 the first synchronization signal B1 to interlock from the interlock stop state. Transition to ringing state.

  For example, as shown in the time chart of FIG. 6, 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 first synchronization signal B1 and the alarm sound stop time. Do the time limit. 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,... By the first synchronization signal B1, thereby shifting from the interlock stop state to the interlock ringing state.

  On the other hand, as shown in the time chart of FIG. 7, 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 the elapse of time, a recovery notification message is transmitted to each slave station TR2,... By the first synchronization signal B1, and when the ACK returned from all the slave stations TR2,. Then, by stopping the transmission of the first synchronization signal B1, the wireless communication by the TDMA system (synchronous communication) returns to the wireless communication by intermittent transmission / intermittent reception (hereinafter referred to as “asynchronous communication”).

  Further, as shown in the time chart of FIG. 8, if the fire of the fire source is extinguished 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 stored in the memory. If no fire is detected by all the fire alarms TR, the recovery notification is made by the first synchronization signal B1. A message M3 is transmitted to each of the slave stations TR2,. Then, when the control unit 1 of the master station TR1 receives ACKs returned from all the slave stations TR2,..., The synchronous communication is performed by shifting from the interlock stop state to the standby state and stopping the transmission of the first synchronization signal B1. Return to asynchronous communication.

  On the other hand, as shown in the time chart of FIG. 9, 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.

  The alarm stop message and the recovery notification message described above are relayed between the master station TR1 and the slave stations TR5 and TR6 belonging to the subgroup SG by the relay RY.

  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 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 to fire non-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. The wireless transmission / reception unit 2 transmits a synchronization signal (first synchronization signal B1) including an alarm stop message (step S6). Also, an alarm stop message is periodically transmitted by the synchronization signal (first synchronization signal B1) until the alarm sound stop time elapses after the transition from the interlock sounding state to the interlock stop state (steps S7, S8, S6) When the alarm sound stop time has elapsed (step S8), whether there are any remaining fire alarms (master station TR1 and slave stations TR2,...) Being detected by referring to the fire detection status held in the memory. (Step S9) If at least one fire alarm is still being detected, it is determined that the fire interlock is continued and a synchronization signal (first synchronization signal) including a fire alarm message from the wireless transceiver 2 is determined. B1) is transmitted (step S10). On the other hand, if all the fire alarms are not fire-detected, the recovery from the fire-linked state to the standby state is determined, and the wireless transmission / reception unit 2 includes a recovery notification message. To transmit a period signal (step S11).

  Here, if any of the slave stations TR2,... Does not return an ACK in response to the recovery notification message, the control unit 1 of the parent station TR1 transmits a radio signal including the recovery notification message from the radio transmission / reception unit 2 again. It is desirable to stop the radio transmission / reception unit 2 from transmitting a synchronization signal when an ACK is received from the slave stations TR2,..., Or when a predetermined time has elapsed after the recovery notification message is retransmitted a predetermined number of times. When the master station TR1 fails and the synchronization signal (first synchronization signal B1) is not transmitted in the interlocking ringing state or the interlocking stopped state, the radio transmission / reception unit 2 of the slave stations TR2,. Since the battery may be remarkably consumed in order to receive the signal B1), the control unit 1 of the slave stations TR2,... Cannot receive the synchronization signal (first synchronization signal B1). When the period continues for a predetermined time (for example, a time corresponding to several cycles of the first synchronization signal B1) or more, it is desirable to stop the transmission / reception unit 2 to suppress battery consumption. If the first synchronization signal B1 is not transmitted from the master station TR1, the second synchronization signal B2 is not transmitted from the repeater RY, so that the control unit 1 of the slave stations TR5 and TR6 belonging to the subgroup SG is synchronized. It is desirable to suppress battery consumption by pausing the transmitter / receiver 2 when a period during which the signal (second synchronization signal B2) cannot be received continues for a predetermined time (for example, several cycles of the second synchronization signal B2) or longer. .

  By the way, as described above, the master station TR1, the slave stations TR2,... And the repeater RY have a unique (unique) identification code without distinction between the master station, the slave station, the fire alarm device TR, and the repeater RY at the manufacturing stage. Is stored in the memory, but when the identification code is designated as the transmission source address SA and the transmission destination address DA of the wireless signal, the bit length of the header HD becomes relatively long, so that the transmission / reception time of the wireless signal Will increase the battery consumption. Therefore, in the main group MG, the identification code (master station ID) of the master station TR1 is included in the header HD, and device numbers are assigned to the slave stations TR2 to TR4 and the repeaters RY belonging to the main group MG for transmission. Each fire alarm device TR and repeater RY in the same system (main group MG) is identified and transmitted / received radio signals by the combination of the device number specified in the source address SA and the destination address DA and the master station ID. I am doing so. Further, in the subgroup SG, the identification code (relayer ID) of the relay RY is included in the header HD, and device numbers are assigned to the slave stations TR5 and TR6 belonging to the subgroup SG, and the source address SA and A radio signal is transmitted and received by identifying each fire alarm device TR in the same system (subgroup SG) by a combination of the device number specified in the transmission destination address DA and the repeater ID. In this embodiment, “0” is assigned to the master station TR1, “1” to “5” are assigned to the slave stations TR2 to TR6, and “14” is assigned to the repeater RY. The device number also corresponds to the allocation of the time slot TS. As shown in FIG. 1, the first time slot TS1 immediately after the first synchronization signal B1 and the second time slot TS2 are relays RY whose device number is 14. The last time slot TS16 is assigned to the slave station TR2 with the device number 1, and the time slots TS15 to TS12 are assigned to the slave stations TR3 to TR6 with the device numbers 2 to 5 in ascending order toward the top. .

  Next, the identification code (hereinafter referred to as “child station ID”) of the slave stations TR2,... Is stored in the master station TR1, and the device numbers are assigned to the slave stations TR2,. (Hereinafter referred to as “registration”) will be described with reference to the sequence diagram of FIG.

  First, when an operation input for switching to a mode for registering (registration mode) is received by the operation input receiving unit 6 of the master station TR1, an operation signal for switching from the operation input receiving unit 6 to the registration mode is sent to the control unit 1. In response to the operation signal, the control unit 1 shifts to the registration mode. On the other hand, when an operation input for transmitting a registration message is received by the operation input reception unit 6 of the slave station (for example, TR2) to be registered, an operation signal instructing transmission of the registration message from the operation input reception unit 6 is controlled. In response to the operation signal, the control unit 1 wirelessly transmits a radio signal having its own slave station ID as a transmission source address SA, a multicast address as a transmission destination address DA, and a registration message as data Data. The transmission / reception part 2 transmits.

  When receiving the registration message from the slave station TR2, the control unit 1 of the master station TR1 assigns a device number (for example, “1”) to the slave station ID specified in the transmission source address SA, and the slave station ID And the device number are associated with each other and stored in the memory unit 1a. Here, as will be described later, the control unit 1 of the master station TR1 has a registration counter that is incremented every time the registration contents (slave station ID and device number stored in the memory unit 1a) are deleted, and the transmission source address A registration message consisting of the assigned device number and the count value of the registration counter (initial value is 0) is set as data with SA as the master station ID, the destination address DA as the slave station ID of the slave station TR2 that is the source of the registration message. A radio signal as Data is transmitted from the radio transmission / reception unit 2 to the slave station TR2. However, information indicating that the device number is allocated (hereinafter referred to as “registration mode information”) is included in the head portion of the data Data.

  If the registration mode information is included in the head part of the data Data of the radio signal received by the radio transmission / reception unit 2, the control unit 1 of the slave station TR2 includes the master station ID that is the transmission source address SA of the radio signal, The device number and the count value of the registration counter included in the registration message received by the radio signal are stored in the memory unit 1a in association with each other. As a result, the control unit 1 of the master station TR1 stores the slave station ID and device number of the slave station TR2 and the count value of the registration counter in the memory unit 1a, and the control unit 1 of the slave station TR2 stores the master station ID of the master station TR1. The device number and the count value of the registration counter are stored in the memory unit 1a, whereby the registration of the slave station TR2 with the master station TR1 is completed. The other slave stations TR3,... And the repeater RY may be registered in the same procedure. If the operation input reception unit 6 of the master station TR1 receives an operation input for returning from the registration mode to the normal operation mode and an operation signal is output from the operation input reception unit 6 to the control unit 1, the control unit 1 ends the registration mode and switches to the normal operation mode.

  Here, when transmitting and receiving radio signals between the master station TR1 and the slave stations TR2,... In the registration mode, the identification codes (slave station IDs) of the slave stations TR2,. For example, even when registration messages are transmitted almost simultaneously from a plurality of slave stations TR2,..., The same device number is assigned to the plurality of slave stations TR2,. Can be prevented.

  By the way, once registered, the master station ID, slave station ID, device number, and count value can be deleted from the memory unit 1a. As shown in FIG. 11, when the operation input receiving unit 6 of the master station TR1 receives an operation input for switching to a mode (erase mode) for deleting registered contents, the operation input receiving unit 6 switches to the erase mode. An operation signal is output to the control unit 1, and the control unit 1 shifts to an erasing mode according to the operation signal. In this erasure mode, when the operation input accepting unit 6 of the master station TR1 accepts an operation input for confirming erasure, an operation signal for confirming erasure is output from the operation input accepting unit 6 to the control unit 1, and according to the operation signal The control unit 1 erases the slave station ID and the device number stored in the memory unit 1a and increments the count value of the registration counter. When the operation input receiving unit 6 of the master station TR1 receives an operation input for returning from the erasure mode to the normal operation mode and an operation signal is output from the operation input receiving unit 6 to the control unit 1, the control unit 1 ends the erase mode and switches to the normal operation mode.

  On the other hand, when the operation input receiving unit 6 of the slave stations TR2,... Receives an erasing operation input, an operation signal for erasing is output from the operation input receiving unit 6 to the control unit 1, and in accordance with the operation signal, the control unit 1 erases the master station ID, the device number and the count value stored in the memory unit 1a.

  Thus, even if the registered contents of the registered slave stations TR2,... Are not deleted even though the registered contents of the master station TR1 are deleted, the newly registered slave stations TR2,. Since the count value of the registration counter is incremented and changed for ..., even if the same device number is assigned to different slave stations TR2, ..., it is currently valid depending on the count value of the registration counter of the master station TR1. The device number that is can be specified. Therefore, the slave stations TR2,..., Whose registered contents remain without being erased, do not receive the radio signal because the count values included in the header HD of the radio signal transmitted from the master station TR1 do not match. Therefore, it is possible to avoid a problem that a plurality of slave stations TR2,.

  Thus, in the normal operation mode already described, as shown in FIG. 4, the master station ID of the master station TR1 is designated as the master station ID of the header HD, and the master station TR1 and the slave stations TR2 are designated as the count value RC. The count value stored in the memory unit 1a is designated, and radio signals designating device numbers assigned to the transmission source address SA and the transmission destination address DA are transmitted and received. Compared to the case where the source and destination addresses are specified using only the assigned unique identification code, the device number whose information amount may be sufficiently smaller than the identification code (for example, the identification code is usually The device number may be 4 to 8 bits compared to 48 bits), so that the length of one frame is relatively shortened, and as a result, the transmission time of the radio signal is shortened. It is possible to reduce the drain on the battery Te.

  In addition, when the fire alarm system of the present embodiment is installed in a plurality of houses in a densely populated area, radio signals may interfere in the normal operation mode because the master station ID is different from the fire alarm system of the neighboring house. However, in the registration mode, the slave stations TR2,... That have received the radio signal transmitted from the neighbor fire alarm system may erroneously store the master station ID of the neighbor parent station TR1. Therefore, in the present embodiment, the control unit 1 of the master station TR1 transmits registration mode information together with the registration message to the slave stations TR2,..., And the control unit 1 of the slave stations TR2,. Only when the registration mode information is included in the head portion of the data Data, the master station ID that is the transmission source address SA of the wireless signal, the device number included in the registration message received by the wireless signal, and the registration The count value of the counter is associated with and stored in the memory unit 1a. Therefore, even if the slave station TR2,... Receives a radio signal in the normal operation mode transmitted from the fire alarm system of the neighboring house, the erroneous information is not included unless the registration signal information is included in the radio signal. There is no risk of registration.

  Next, registration of repeaters RY and slave stations TR5 and TR6 belonging to the subgroup SG will be described. However, it is assumed that registration of the slave stations TR5 and TR6 to the master station TR1 has already been completed.

  First, when an operation input for switching to the registration mode is received by the operation input receiving unit 13 of the repeater RY, an operation signal for switching to the registration mode is output from the operation input receiving unit 13 to the control unit 10 according to the operation signal. Then, the control unit 10 shifts to the registration mode. On the other hand, when an operation input for transmitting a registration message is received by the operation input receiving unit 6 of the slave station (for example, TR5) to be registered, an operation signal instructing transmission of the registration message from the operation input receiving unit 6 is controlled. In response to the operation signal, the control unit 1 sets its own slave station ID as the transmission source address SA, sets the multicast address as the transmission destination address DA, and includes the master station ID and the count value of the registration counter. A wireless signal having the registration message as data Data is transmitted from the wireless transmission / reception unit 2.

  When receiving the registration message from the slave station TR5, the control unit 10 of the repeater RY associates the slave station ID specified in the transmission source address SA with the master station ID and the count value included in the registration message, and stores the memory unit 10a. , The transmission source address SA is set as the relay ID, the transmission destination address DA is set as the slave station ID of the slave station TR5 that is the transmission source of the registration message, and the registration message including the count value received from the slave station TR5 is received. A radio signal as data Data is transmitted from the radio transceiver 11 to the slave station TR5. However, registration mode information is included in the head portion of the data Data.

  The control unit 1 of the slave station TR5 sets a flag indicating that it belongs to the subgroup SG if the registration mode information is included in the head portion of the data Data of the radio signal received by the radio transmission / reception unit 2. Then, the repeater ID, which is the transmission source address SA of the wireless signal, is associated with the count value and stored in the memory unit 1a, the transmission source address SA is set as its own slave station ID, and the transmission destination address DA is set as the relay ID. Then, the wireless transmission / reception unit 2 causes the relay RY to transmit a radio signal having the registration response message including the count value received from the relay RY and the device number stored in the memory unit 1a as data Data.

  If the count value included in the registration response message received from the slave station TR5 matches the count value stored in the memory unit 10a, the control unit 10 of the repeater RY is a device included in the registration response message. The number and the slave station ID of the slave station TR5 are associated with each other and stored in the memory unit 10a.

  Subsequently, the repeater RY in which the slave stations TR5 and TR6 are registered is registered in the master station TR1. When the operation input receiving unit 13 of the repeater RY receives an operation input for transmitting a registration message, an operation signal instructing transmission of the registration message is output from the operation input receiving unit 13 to the control unit 10, and the operation signal Accordingly, the control unit 10 sets its own repeater ID as the transmission source address SA, sets the master station ID stored in the memory unit 10a as the transmission destination address DA, and includes the count value stored in the memory unit 10a. A wireless signal having the registration message as data Data is transmitted from the wireless transmission / reception unit 11.

  If the count value included in the registration message received from the repeater RY matches the count value stored in the memory unit 1a, the control unit 1 of the master station TR1 relays that is designated as the source address SA. A device number (for example, “14”) is assigned to the device ID, and the repeater ID and the device number are associated with each other and stored in the memory unit 1a. Further, the registration including the assigned device number and the count value of the registration counter is performed. A radio signal having a message as data Data is transmitted from the radio transmission / reception unit 2 to the repeater RY.

  The repeater control unit 10 of the repeater RY includes a master station ID that is a transmission source address SA of a wireless signal received by the wireless transmission / reception unit 11, a device number included in the registration message received by the wireless signal, and a registration counter. The count value is associated and stored in the memory unit 10a, and the transmission source address SA is set as its own repeater ID, the transmission destination address DA is set as the master station ID, and the count value received from the master station TR1 and assigned to itself The radio transmission / reception unit 11 transmits a radio signal using the registration response message including the device number and the device number of the slave stations TR5 and TR6 belonging to the subgroup SG to the master station TR1.

  If the count value included in the registration response message received from the relay RY matches the count value stored in the memory unit 1a, the control unit 1 of the master station TR1 relays the relay included in the registration response message. The device number of the device RY and the relay device ID of the relay device are stored in the memory unit 1a in association with each other, and the device numbers of the slave stations TR5 and TR6 included in the registration response message belong to the subgroup SG. The flag shown is set and stored in the memory unit 1a.

  As described above, registration of the slave stations TR5 and TR6 belonging to the subgroup SG to the repeater RY and registration of the subgroup SG to the master station TR1 are completed.

  Thus, in the synchronous communication, the control unit 10 of the repeater RY receives the second synchronization signal B2 including the message (such as an alarm stop message) received from the master station TR1 with the first synchronization signal B1 in the first time slot TS1. The second time slot stores a radio signal including a message (alarm stop message, recovery notification message, etc.) received from the slave stations TR5 and TR6 of the subgroup SG while being stored and transmitted to the slave stations TR5 and TR6 of the subgroup SG Store in TS2 and transmit to parent station TR1. Thus, since the period (time slot TS1, TS2) in which the radio signal is transmitted from the repeater RY is continuous, it is possible to satisfy the conditions of the transmission period and the pause period specified by the law. In asynchronous communication, since the radio transceiver 11 of the repeater RY is always in a receiving state except during regular monitoring, the fire alarm message transmitted from the slave station TR5 or TR6 belonging to the subgroup SG is transmitted. It is possible to immediately relay to the master station TR1 and the slave stations TR2 to TR4 belonging to the main group MG.

  As described above, according to the present embodiment, the time slot defined by the first synchronization signal B1 transmitted from the specific fire alarm (master station TR1) and the second synchronization signal B2 transmitted from the repeater RY are defined. Since the time slots to be overlapped in time, the radio signal can be relayed in substantially the same time as when there is no repeater RY.

It is explanatory drawing of the time slot in embodiment. It is a system block diagram same as the above. (A) is a block diagram of the fire alarm device in the above, and (b) is a block diagram of the repeater in the above. It is a frame format of the radio signal in the same as above. It is a timing chart for demonstrating the operation | movement which changes to a fire interlocking state (synchronous communication) from the standby state (asynchronous communication) 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. It is a sequence diagram for demonstrating operation | movement of the registration mode and deletion mode same as the above.

Explanation of symbols

TR1 Fire alarm (master station)
TR2 Fire alarm (slave station)
RY repeater 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)
10 Repeater control unit (Repeater control means)
11 Wireless transceiver (reception means, transmission means)

Claims (2)

A plurality of fire alarms that transmit radio signals using radio waves as a medium, and a relay that relays radio signals transmitted from any of the fire alarms to any of the other 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 radio signal including a fire alarm message is transmitted from any fire alarm, the control means of the specific fire alarm that has received the radio signal includes a fire alarm message for all other fire alarms A wireless signal is transmitted from the transmission unit and a first synchronization signal having a fixed period is transmitted from the transmission unit,
In all other fire alarms except the specific fire alarm, after the transmission of the first synchronization signal is started from the transmission means of the specific fire alarm, the control means is defined by the first synchronization signal. A wireless signal is stored in a specific time slot assigned to itself among a plurality of time slots and transmitted from the transmission means,
The repeater is configured to transmit a fire alarm message transmitted from a relay target fire alarm registered in advance among a transmission unit that transmits a radio signal, a reception unit that receives a radio signal, and the other fire alarms. When the receiving means receives the wireless signal including the fire alarm message, the transmitting means transmits the wireless signal including the fire alarm message, and when the receiving means receives the first synchronization signal transmitted from the specific fire alarm, A relay control means for storing a radio signal in a specific time slot allocated to itself among a plurality of defined time slots and transmitting it from a transmission means;
The repeater control means causes the transmission means to transmit the second synchronization signal having the same period as the first synchronization signal when the reception means receives the first synchronization signal transmitted from the specific fire alarm.
In the fire alarm device to be relayed, after the transmission of the second synchronization signal is started from the transmission device of the relay device, the control device is assigned to itself among a plurality of time slots defined by the second synchronization signal. The radio signal is stored in a specific time slot and transmitted from the transmission means,
The time slot defined by the first synchronization signal and the time slot defined by the second synchronization signal are synchronized, and each time slot is different for all other fire alarms including the relay fire alarm. Fire alarm system, characterized in that is assigned.   The repeater control means causes the second synchronization signal to be transmitted from the transmission means in synchronization with the first time slot among the plurality of time slots defined by the first synchronization signal, and the second following the first time slot. The fire alarm system according to claim 1, wherein the time slots are assigned.

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