JP5134424B2 - 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.

  For radio stations used in Japan, the characteristics of radio waves used (RF characteristics) such as occupied frequency bandwidth and adjacent channel leakage power must satisfy the provisions of the Radio Law. In the Radio Law, different standards (communication standards) are defined for each purpose of use. For example, “low-power radio stations” defined as one of the radio stations that do not require a license in the proviso to Article 4 of the Radio Law include “wireless stations for cordless telephones”, “specified low-power radio stations”, “low-power radio stations” There are “security system”, “low-power data communication system radio station”, etc., and the standards for the radio equipment of each radio station are stipulated by the equipment regulations of the law.

  On the other hand, since the obligation to install fire alarms in houses has been legislated to reduce the number of victims of house fires, multiple fire alarms are linked using radio signals from the viewpoint of ease of installation in existing houses. A fire alarm system is desired. Such a fire alarm system has a function in which a plurality of fire alarms (radio stations) installed at multiple locations sense the fire and sound an alarm sound, and any one of the fire alarms When a fire is detected, the relevant fire alarm sounds an alarm sound and transmits information (fire detection information) notifying the fire detection to other fire alarms by radio signal, so that not only the fire source fire alarm A plurality of fire alarms can be interlocked to sound an alarm sound all at once, thereby quickly and reliably informing the occurrence of a fire. 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. In order to avoid such a collision, for example, Patent Document 1 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 1, since each fire alarm device stores and transmits a radio signal in a time slot assigned to itself, the above-described collision can be avoided.

In recent years, security systems that detect and notify abnormalities such as gas leaks other than fire and intrusion of suspicious persons are also becoming widespread (see, for example, Patent Document 2). This type of security system performs wireless communication between a security sensor that detects an abnormality in a target area (for example, a gas leak, breakage of a window glass, intrusion into a monitoring area, etc.) and each security sensor. And a security parent device for notifying the occurrence of the abnormality by sound or light when a wireless signal for notifying abnormality detection is received from the security sensor.
JP 2006-343983 A JP 2007-233681 A

  However, conventionally, the fire alarm system and the security system are operated independently, and when the fire alarm is issued by the fire alarm system, the security system cannot notify the occurrence of the abnormality.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a fire alarm system with improved safety by notifying a fire alarm even in a security system when a fire occurs.

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 alarms to transmit a radio signal including a fire alarm message to notify the fire alarm from the transmitting means, and further activates the receiving means intermittently to cause another fire alarm. comprising a control means for notifying the fire alarm to the alarm means when it receives the radio signal transmitted from the vessel receiving the fire alarm message, and a battery for power supply, one of the fire alarm 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. A security parent for transmitting an error and detecting wireless communication between the security sensor and the security sensor, and notifying the occurrence of the abnormality when receiving a wireless signal notifying the detection of abnormality from the security sensor. A wireless signal including a fire alarm message is transmitted from the transmission means to the security master unit of the security system having a machine, and the control means of the other fire alarm is a fire alarm message transmitted from a specific fire alarm device. A wireless signal including a response message for confirming reception of the wireless signal including The control means of the specific fire alarm device receives the wireless signal including the response message transmitted from all other fire alarm devices by the receiving means, and then transmits the security signal to the specific fire alarm device. A radio signal including a response message for confirming that a radio signal including a fire alarm message is received and transmitted from the security master unit is transmitted from a transmission unit to the base unit. When it is received by the receiving means, the transmission of the synchronization signal with a fixed period is started, and the control means of the specific fire alarm device includes the message for the other fire alarm device in the synchronization signal and is transmitted from the transmitting means, and other fire alarms After the time when the synchronization signal can be received by the reception unit, the control unit of the receiver assigns itself to a plurality of time slots defined by the synchronization signal. Ri relies its dependent particular time slot contains the radio signal, characterized in Rukoto is transmitted from the transmitting means.

According to the invention of claim 1, when a fire occurs, not only a fire alarm is notified by all the fire alarms, but also a security master of the security system that has received the fire alarm message can notify the fire alarm. . As a result, the user has more opportunities to perceive the fire alarm, so that safety can be improved. In addition, all other fire alarms that have transmitted wireless signals including response messages will include a fire alarm message from a specific fire alarm to the security master unit if the receiving means is activated to enable reception. A synchronization signal transmitted from the transmission means of a specific fire alarm can be received after the transmission of the radio signal is completed.

  According to a second aspect of the present invention, in the first aspect of the invention, the specific fire alarm device includes a storage means for storing an identification code for identifying another fire alarm device and the security master unit. The control means causes the transmission means to transmit a radio signal including a fire alarm message only to the other fire alarm device and the security master device whose identification codes are stored in the storage means.

  According to the invention of claim 2, if the identification code of the other fire alarm and the security master is stored in the storage means of the specific fire alarm, the storage means can be stored without any other setting work. Since the control means of the specific fire alarm device transmits a radio signal including the fire alarm message to the other fire alarm device and the security master device in which the identification code is stored, the system can be easily constructed.

The invention of claim 3 is the invention of claim 1 or 2, wherein the control means of all the fire alarms other than the specific fire alarm are in the case of performing synchronous communication, period in which the control unit can not be received on the receiving means a synchronizing signal to be transmitted from the transmitting means, a particular fire alarm control means completes the transmission of radio signals, including alarm stop message or restoration notification message to the security base unit The receiving means is paused when it continues for a predetermined time longer than the time until.

According to the invention of claim 3 , a wireless communication including a fire alarm message from a specific fire alarm to a security master while performing time division multiplex transmission between the specific fire alarm and all other fire alarms. A signal can be transmitted.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, the control means of the specific fire alarm device transmits a radio signal including a message to the security master unit when the synchronization signal is transmitted from the transmission means. Before transmitting to the means, the transmission means includes the interruption notification message to notify all other fire alarms that the transmission of the synchronization signal is interrupted for a certain period of time , and transmits the synchronization signal . The control means of all other received fire alarms stop the receiving means until the predetermined time notified by the interruption notification message elapses, and start the receiving means after the predetermined time elapses. .

According to the invention of claim 4 , wireless communication including a fire alarm message from a specific fire alarm to a security master while performing time division multiplex transmission between the specific fire alarm and all other fire alarms. A signal can be transmitted.

  According to the present invention, safety is improved by notifying a fire alarm even in a security system when a fire occurs.

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

  FIG. 1 is a system configuration diagram of the present embodiment. A fire alarm system is configured by a plurality (only two in the drawing) of fire alarms TR, and a plurality (two in the illustrated example) of security sensors 11 and A security system is configured with the security base unit 10. 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 security sensor 11 of the security system has a detection function for detecting an abnormality (for example, gas leakage, window glass breakage, intrusion into a monitoring area, etc.) in a target area (for example, a house) and the Radio Law Enforcement Regulation No. 6 When a detection function detects an abnormality with a transmission function that transmits a radio signal using radio waves as a medium in compliance with the “radio station of the low-power security system” specified in Article 4, Paragraph 3 A wireless signal for notifying the occurrence of abnormality by the transmission function is transmitted to the security master unit 10. The security master 10 has a communication function for transmitting and receiving 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; It has a notification function for notifying the occurrence of an abnormality with sound or light, and when a wireless signal is received from any security sensor 11 by the communication function, the occurrence of the abnormality is notified by the notification function. However, since the security master device 10 and the security sensor 11 are well known in the art as described in Patent Document 2, a detailed description of the configuration and operation is omitted.

  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). The main component is an alarm unit 5 for informing (sound from a speaker) a fire alarm (hereinafter referred to as “alarm sound”) and a memory unit 1a including a microcomputer and a rewritable nonvolatile semiconductor memory. When a fire is detected by the fire detection unit 4, a radio signal including a fire alarm message is transmitted from the radio transmission / reception unit 2 to cause the alarm unit 5 to sound an alarm sound and to notify other fire alarms TR of the fire alarm. The control unit 1 to be transmitted, the operation input receiving unit 6 that receives an operation input for stopping the alarm sound, as will be described later, and a battery such as a dry battery as a power source. And comprising a battery power supply unit 7 supplies power. 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 of the fire alarm devices TR1, TR2,... Is assigned a unique identification code and stored in the memory unit 1a. The destination of the radio signal and the fire alarm devices TR1, TR2,. Can be identified.

  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. It is stipulated that the period (pause period) provided between the transmission period and the transmission period in which the radio signal should not be transmitted is 2 seconds or more (see No. 5 of the same article). 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.

  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,. A radio signal including a periodic monitoring message is transmitted in order to confirm (periodic monitoring) whether or not (hereinafter referred to as a slave station) is operating normally. 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, receives the radio signal transmitted from each of the slave stations TR2,. There is a slave station TR2,... That does not transmit a radio signal including a notification message within a predetermined time after transmission of the included radio signal, or a notification message transmitted from any of the slave stations TR2,. When notifying the result of monitoring that the battery has run out, the slave station TR2,. ) 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 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 (hereinafter referred to as “synchronous communication”) between a plurality of fire alarms TR. The one cycle is divided into a plurality of time slots, and one different time slot is allocated to each of the slave stations TR2,. Then, a message from the master station TR1 to the slave stations TR2,... Is transmitted in a synchronization signal, and a radio signal including a message from the slave station TR2,... To the master station TR1 is assigned to each slave station TR2,. Stored in the current time slot and transmitted. Therefore, it is possible to reliably avoid collision of radio signals transmitted from a plurality of fire alarm devices TR (the master station TR1 and the slave stations TR2,...). Although the time slot assignment for each fire alarm device TR may be fixed, the time slot assignment information may be notified to each slave station TR2,... By a synchronization signal transmitted from the master station TR1.

  FIG. 2 shows a frame 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 TR1 to all the slave stations TR2,.

  Here, in the security system, in order to avoid interference with the fire alarm system, radio signals are transmitted and received using a frequency channel different from the frequency channel used in the fire alarm system. And a radio signal can be transmitted to and received from the security master unit 10 by switching the frequency channel. In the master station TR1, the identification code of the security master unit 10 is stored in the memory unit 1a in order to transmit and receive radio signals to and from the security master unit 10, and the security master unit 10 also has the master station TR1. Are stored.

  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. Note that each fire alarm device TR is intermittently received asynchronously. However, if the transmission period is repeated a certain number of times (for example, three times), a radio signal including a fire alarm message can be received.

  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 periodically monitors 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 a 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 sends a fire alarm message from the radio transceiver unit 2. A response message (ACK) for confirming reception 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”. .

  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 the present embodiment, the first time slot TS1 is the slave station TR2, the second time slot TS2 is the slave station TR3, the third time slot TS3 is the slave station TR4, and the fourth time slot TS4 is the slave station. Each is assigned to TR5.

  Here, the master station TR1 periodically monitors 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 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.

  In addition, when all the fire alarms TR start the alarm sound, the synchronization signal is transmitted from the master station TR1 at a constant cycle as described above, and the asynchronous communication is shifted to the TDMA synchronous communication. However, the control unit 1 of the master station TR1 repeatedly transmits a fire alarm 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 periodic monitoring is performed almost once a day. Even if the communication path is normal in the regular monitoring described above, the cause (from generation of a new noise source or sudden failure) Etc.), a communication path between any of the slave stations TR3 to TR5 and the master station TR1 may not be established. Therefore, when the control unit 1 of the master station TR1 does not receive an ACK from any of the slave stations TR3 to TR5 (for example, TR5), the radio signal including the fire alarm message is transmitted again from the radio transceiver unit 2, and the slave station TR5 When the ACK is received from the wireless transmission / reception unit 2, the wireless transmission / reception unit 2 transmits the synchronization signal. However, if the ACK cannot be received from the slave station TR5 even if the fire alarm message is transmitted a predetermined number of times, the control unit 1 of the master station TR1 stops the retransmission of the fire alarm message and sends it to the radio transceiver unit 2. Send a sync signal. Further, the control unit 1 of the master station TR1 includes the above-described fire alarm message for the slave stations TR2,... That have not been able to establish a communication path in the regular monitoring, or have received a notification message that the battery is dead in the regular monitoring. The wireless signal may not be retransmitted, the number of retransmissions may be reduced, or the synchronization signal may be transmitted regardless of whether a response message is received from the slave stations TR2,. However, for the slave stations TR2,... That have notified only the monitoring result with failure by the notification message in the regular monitoring, it is possible that the alarm unit 5 can sound an alarm sound in response to the fire alarm message. Therefore, it is desirable that the control unit 1 of the master station TR1 retransmits the radio signal including the fire alarm message.

  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 retransmission of the fire alarm message, there is a risk that the battery will be exhausted earlier or the switching from asynchronous communication to synchronous communication may be delayed.

  Therefore, in the fire alarm system of the present embodiment, as shown in FIG. 4, the control unit 1 of the master station TR1 transmits a radio signal (frame) including a fire alarm message from the radio transmission / reception unit 2 continuously N times. The wireless transmission / reception unit 2 is switched to the reception state after N times of transmission. At this time, 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). The control unit 1 of TR2,... Estimates the timing at which the radio transceiver unit 2 of the master station TR1 switches from the transmission state to the reception state based on the order i stored in the message M of the received radio signal. .

  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 the order determined for each of the slave stations TR2,. In the synchronous communication of the system, a radio signal including a response message is stored in a time slot k (k = 1, 2,..., M) that matches a time slot number (slot number) TS, and the parent station TR2,. If the response is made to the station TR1, collision of radio signals including response messages transmitted from the slave stations TR2,... Can be avoided. In FIG. 4, each of the slave stations TR2, TR3, TR4, and TR5 stores a radio signal including a response message in each of the time slots 1, 2, 3, and 4, and sends it back to the master station TR1. The control unit 1 of each slave station TR2,... Returns a radio signal including a response message to the master station TR1, and then switches the radio transmission / reception unit 2 to the reception state and receives a synchronization signal transmitted from the master station TR1. Maintained in a possible state.

  Furthermore, when the control unit 1 of the master station TR1 receives response messages from all the slave stations TR2,... Or transmits a radio signal including a fire alarm message a predetermined number of retransmissions, the frequency channel of the radio transmission / reception unit 2 is changed. After switching to the frequency channel used in the security system, a wireless signal including a fire alarm message is transmitted from the wireless transmission / reception unit 2 to the security master unit 10 (see FIG. 4). The security master device 10 that has received the radio signal returns a radio signal including a response message (ACK) for confirming that the fire alarm message has been received to the master station TR1, and also receives the fire alarm received from the master station TR1. Based on the message, fire alarm is notified by sound and light. Then, after receiving the response message from the security master unit 10, the control unit 1 of the master station TR1 causes the wireless transmission / reception unit 2 to start transmitting a synchronization signal. In each slave station TR2,..., The radio transmission / reception unit 2 is maintained in the reception state, so that it is possible to receive the synchronization signal transmitted from the master station TR1 and immediately shift to synchronous communication.

  As described above, according to the present embodiment, when a fire occurs, not only the fire alarm is notified by all the fire alarm devices TR, but also the security master 10 of the security system that has received the fire alarm message notifies the fire alarm. Therefore, safety can be improved because the user has more opportunities to perceive a fire alarm (listen to an alarm sound).

  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 (for example, the slave station TR2) in the standby state, as described above, all the other slaves from the fire source slave station TR2 and the master station TR1. When the fire alarm message is transmitted to the stations TR3,..., 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 holds the fire detection status for each master station TR1 and each slave station TR2,... 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 unit 1a, and if all the fire alarms TR do not detect a fire, the control unit 1 By sending a recovery notification message with a signal, the state transitions from a fire-linked state to a standby state. If a fire is detected by at least one fire alarm TR, a fire alarm message is sent with a synchronization signal. Transition from the linked stop state to the 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. 5, in a fire-linked state (linked ringing state) with the master station TR1 as 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. 6, 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,. By stopping the transmission, the wireless communication (synchronous communication) by the TDMA system returns to the wireless communication (asynchronous communication) by intermittent transmission / intermittent reception.

  Further, as shown in the time chart of FIG. 7, 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 held in the memory unit 1a. If no fire is detected by all the fire alarms TR, the recovery notification message is sent by a synchronization signal. M3 is transmitted to each of the slave stations 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. 8, when a fire is newly detected by another fire alarm (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 unit 1a, and does not transmit a recovery notification message because the slave station TR3 is detecting a fire, and continues to transmit a fire alarm message. To maintain a fire-linked state.

  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 one 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-linked state, when the alarm stop message is received from any of the slave stations TR2,. 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).

  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. Further, when the master station TR1 fails in the interlocking ringing state or the interlocking stop state and the synchronization signal is not transmitted, the radio transmission / reception unit 2 of the slave stations TR2,... Remains in the reception state in order to receive the synchronization signal. If the control unit 1 of the slave stations TR2,... Continues to receive a synchronization signal for a predetermined time (for example, a time corresponding to several cycles of the synchronization signal) or longer, the battery may be consumed significantly. It is desirable to stop the wireless transmitter / receiver 2 to reduce battery consumption.

  By the way, during the synchronous communication, the radio transmission / reception unit 2 of the master station TR1 transmits the synchronization signal at a constant period and is stored in the time slot TS during the period in which the synchronization signal is not transmitted. Since the reception state is maintained so that the wireless signal transmitted from... Can be received, the wireless signal including the alarm stop message and the recovery notification message described above cannot be transmitted to the security master unit 10.

  Therefore, the control unit 1 of the master station TR1 temporarily stops the transmission of the synchronization signal, switches the frequency channel of the radio transmission / reception unit 2 to the frequency channel of the security system, and transmits a radio signal including an alarm stop message or a recovery notification message. When the ACK returned from the security master 10 is received, the frequency channel of the wireless transmission / reception unit 2 is returned to the frequency channel of the fire alarm system to resume transmission of the synchronization signal. At this time, the control unit 1 of each of the slave stations TR2,... Pauses the radio transmission / reception unit 2 when the period during which the synchronization signal cannot be received continues for a predetermined time or longer. A time longer than the time required to send and receive a radio signal including an alarm stop message, a recovery notification message, etc. and a radio signal including a response message (ACK) with the base unit 10 (for example, several cycles of the synchronization signal) If it is set to (time), it is possible to prevent the radio transmission / reception units 2 of the slave stations TR2,.

  Alternatively, the control unit 1 of the master station TR1 notifies a message (interruption notification message) to interrupt the transmission of the synchronization signal for a predetermined time to the slave stations TR2,. The wireless transmission / reception unit 2 is suspended from the time when the unit 1 receives the interruption notification message until the predetermined time elapses. When the predetermined time elapses, the wireless transmission / reception unit 2 is activated to resume transmission from the master station TR1. It is also possible to receive the synchronized signal. When the security master device 10 receives an alarm stop message or a recovery notification message, it performs processing corresponding to the message (for example, stop of a fire alarm).

  By the way, in the control unit 1 of the master station TR1, none of the identification codes of the slave stations TR2,... Is stored (registered) in the memory unit 1a, and the identification code of the security master unit 10 must also be stored (registered). For example, the radio transmission / reception unit 2 is stopped at all times, and when a fire is detected by the fire detection unit 4, an alarm input from the alarm unit 5 is notified and an operation input for stopping the alarm sound from the operation input reception unit 6 is provided. When it is accepted or when the fire detection unit 4 no longer detects a fire, only the process of causing the alarm unit 5 to stop reporting the fire alarm is executed. Further, when only the identification code of the security master unit 10 is stored (registered) in the memory unit 1a, the control unit 1 of the master station TR1 operates the wireless transmission / reception unit 2 to perform a fire-linked process with the security master unit 10 Also do. As described above, the master station TR1 operates as a single fire alarm device in a state where none of the identification codes of the slave stations TR2,... And the security master unit 10 is stored (registered) in the memory unit 1a of the control unit 1. If at least one of the identification codes of the slave stations TR2,... Or the security master unit 10 is stored (registered), the above-described processing such as the fire interlock is executed, and the memory unit 1a of the master station TR1 Since there is no need to perform a work other than the work of registering the identification code in, for example, a work for setting whether or not to link with the security system, there is an advantage that the system can be easily constructed. In order to register the identification codes of the slave stations TR2,... And the security master unit 10 in the master station TR1, for example, the slave stations TR2,... And security in the state where the control unit 1 of the master station TR1 is operated in the registration mode. It is only necessary to transmit a registration radio signal from the master unit 10 and store the source address SA of the received radio signal in the memory unit 1a. The identification code of the master station TR1 to the slave units TR2,. Can be registered in the same way.

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 frame 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 transfers to asynchronous communication from 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.

Explanation of symbols

TR1 Fire alarm (master station)
TR2 Fire alarm (slave station)
1 Control unit (control means)
1a Memory unit (storage means)
2 Wireless transmission / reception unit (reception means, transmission means)
4 Fire detection part (fire detection means)
5 Alarm section (alarm means)
10 Security Master 11 Security Sensor

Claims (4)

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 informs the fire alarm and other fire alarms send a radio signal including a fire alarm message to inform the fire alarm from the transmitting means, and the receiving means is activated intermittently to cause another fire. A control means for notifying the alarm means of a fire alarm when receiving the fire alarm message by receiving a radio signal transmitted from an alarm device, and a battery for power supply ,
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 When a wireless signal is transmitted from the transmission means, wireless communication is performed between the security sensor for detecting an abnormality in the target area and the security sensor, and a wireless signal for notifying abnormality detection is received from the security sensor, the abnormality is detected. Sending a wireless signal including a fire alarm message from the transmission means to the security parent device of the security system having a security parent device that notifies the occurrence ,
The control means of the other fire alarm is configured to transmit a radio signal including a response message for confirming that the radio signal including the fire alarm message transmitted from the specific fire alarm is received from the specific fire alarm. Send to
The control means of a specific fire alarm device receives a wireless signal including a response message transmitted from all other fire alarm devices, and then transmits a wireless signal including a fire alarm message to the security master unit. When the receiving means receives the wireless signal including the response message for confirming that the wireless signal including the fire alarm message, which is transmitted from the security device and transmitted from the security master unit, is received, the synchronization signal is transmitted at a constant period. Start,
A specific fire alarm control means includes a message for other fire alarms in the synchronization signal and is transmitted from the transmission means, and the other fire alarm control means can receive the synchronization signal by the reception means. after the time, the fire alarm system according to claim isosamples stores a wireless signal to a particular time slot assigned to the self is transmitted from the transmitting means of the plurality of time slots defined by the synchronization signal.   The specific fire alarm has a storage means for storing an identification code for identifying another fire alarm and the security master unit, and the control means for the specific fire alarm has an identification code stored in the storage means. 2. The fire alarm system according to claim 1, wherein a radio signal including a fire alarm message is transmitted from the transmission means only to the other fire alarm device and the security master device. Control means of all the other fire alarm excluding particular fire alarm, in case where performing synchronous communication, received by the receiving means a synchronizing signal a particular fire alarm control means is transmitted from the transmitting means When the control period of a specific fire alarm device has continued for a predetermined time longer than the time until the completion of the transmission of a radio signal including an alarm stop message or a recovery notification message to the security master unit The fire alarm system according to claim 1 or 2, wherein the fire alarm system is stopped. When the control means of a specific fire alarm is transmitting a synchronization signal from the transmission means, before sending the wireless signal including the message for the security parent unit to the transmission means, all other fire alarms are controlled. Including the interruption notification message to notify that the transmission of the synchronization signal is interrupted for a certain time from the transmission means,
The control means of all the other fire alarm devices that have received the synchronization signal stop the receiving means until the fixed time notified by the interruption notification message elapses, and activate the receiving means after the fixed time has elapsed. The fire alarm system according to claim 1 or 2.

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