JP2006343982A - Fire-reporting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely receive a response message, returned from a fire detector, with a receiver. <P>SOLUTION: All fire sensors 10 receive and store response messages transmitted from any other fire sensors 10. When a response message from one of the fire sensors 10 is not received by a wireless relaying device 1 (a receiver), a transfer request message, which requests the transfer of the response message from the fire sensor 10, is distributed by broadcasting from the wireless relaying device 1 to all the fire sensors 10. According to the transfer request message, any other fire sensors 10, which receive and store the response message of the fire sensor 10, transfer the response message. Accordingly, a response message returned from one of the fire sensors 10 can surely be received by the wireless relaying device 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fire alarm system having a plurality of fire detectors for detecting a fire and a receiving device for performing wireless communication using a radio wave as a medium between the fire detectors.

  2. Description of the Related Art Conventionally, various fire alarm systems have been provided that include a plurality of fire detectors that detect a fire and a receiver that receives a fire detection signal transmitted from the fire detector that detects a fire in a wired manner. On the other hand, wireless communication between the fire detector and the receiving device should be performed due to the advantage that the wiring between the fire detector and the receiving device is not required when newly installed in an existing facility. A fire alarm system has been proposed (see Patent Document 1).

  On the other hand, in either the wired or wireless communication system, a reply request message is periodically sent from the receiving device to each fire detector in order to confirm that a plurality of fire detectors are operating normally. Each fire detector returns a response message indicating the operating state of its own device to the receiving device, and based on the response message, determines whether or not a failure such as a dead battery has occurred in the fire detector. Yes.

  Here, in order to improve the reliability of the fire alarm system, it is necessary to exchange the periodic transmission request message and the response message as described above as frequently as possible. For example, in the EN standard (European unified standard), a standard (EN54-25) that obligates the exchange of messages at a rate of once every 300 seconds is planned.

By the way, periodic message exchange is frequently performed as described above, and the more the number of fire detectors included in the system, the higher the probability that a collision will occur due to overlapping transmission timings of the fire detectors. Therefore, it is necessary to avoid such a collision. Therefore, in the thing of patent document 1, while the carrier used for radio | wireless communication is detected, the carrier sense system which transmits a radio signal when a carrier is not detected without transmitting a radio signal is detected. It has been adopted.
Japanese Patent No. 2840367

  However, in the carrier sense system, since a certain time is required for switching between transmission / reception of radio circuits, collision cannot be completely avoided. Therefore, as another collision avoidance method, wireless communication between the receiving apparatus and the plurality of fire detectors may be performed by a time division multiple access (TDMA) method. That is, in the TDMA system, a collision can be avoided because a plurality of fire detectors transmit a message in a time slot assigned individually. However, even when such a TDMA system is adopted, a message from the fire detector may not be received by the receiving device due to the influence of the external environment (external noise, interference wave, etc.).

  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 reliably receiving a response message returned from a fire detector by a receiving device.

  In order to achieve the above object, the invention of claim 1 includes a plurality of fire detectors for detecting a fire, and a receiver for performing wireless communication using radio waves as a medium between the fire detectors. The sensor includes a sensing means for sensing a fire by detecting a temperature change and smoke generated by a fire, a wireless transmitting means for transmitting a wireless signal, a wireless receiving means for receiving a wireless signal, and at least a sensing means. And a control means for controlling the wireless transmission means to transmit the fire detection information by a wireless signal when a fire is detected by the wireless communication means, and the receiving device is a wireless transmission means for transmitting the wireless signal, and a wireless for receiving the wireless signal. A reception means, a wireless transmission means and a control means for controlling the wireless reception means. The control means of the reception device periodically sends a transmission request message requesting a predetermined response from the wireless transmission means to all fire detectors. Target When a transmission request message is received, the control unit of the fire detector sends a predetermined response message indicating the operation state of the own device to the receiving device from the wireless transmission unit as a wireless signal. The control means for the apparatus and the fire detector includes one downstream time slot from the receiving device to the fire detector, and a plurality of upstream times from the fire detector to the receiving device assigned to each fire detector. A fire alarm system for exchanging a transmission request message and a response message in a superframe in which a certain number of frames composed of slots are collected, and the control means of the receiving device is a fire detector in which the response message could not be received Means for wirelessly transmitting a transfer request message for requesting transfer of the response message to all fire detectors in a downlink time slot When the fire sensor control means stores the response message of the radio signal transmitted from another fire sensor and received by the wireless receiving means, and receives a transfer request message from the receiving device. The stored response message of the other fire detector is transmitted as a radio signal from the radio transmission means in the uplink time slot assigned to the own fire detector.

  According to a second aspect of the present invention, in the first aspect of the invention, the control means of the fire detector transmits a radio signal of a response message to the transfer request message in the upstream time slot prior to the upstream time slot assigned to the fire detector. When received by the wireless receiving means, the wireless signal is not transmitted in the uplink time slot assigned to the own device.

  According to a third aspect of the present invention, in the first aspect of the present invention, the receiving device further includes a signal strength detecting unit that detects a signal strength of a radio signal received by the wireless receiving unit. Among the fire detectors that did not receive the response message and the other fire detectors that transmitted the response message of the fire detector, the fire detector with the highest signal strength detected by the signal strength detection means If the same fire detector response message is not received again in the superframe after this time, for other fire detectors that store the combination with that fire detector Only the transfer request message is transmitted.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the control means of the receiving device transfers a fire detector that has not received a response message in the previous superframe and a response message of the fire detector. The combination with other fire detectors is memorized, and when the response message of the same fire detector is not received again in the subsequent superframe, the combination with the fire detector is memorized. The transfer request message is transmitted only to any one of the other fire detectors, and the other fire detectors to which the transfer request message is transmitted are sequentially replaced every superframe.

  In order to achieve the above object, the invention of claim 5 includes a plurality of fire detectors for detecting a fire, and a receiving device for performing wireless communication using radio waves as a medium between the fire detectors. The sensor includes a sensing means for sensing a fire by detecting a temperature change and smoke generated by a fire, a wireless transmitting means for transmitting a wireless signal, a wireless receiving means for receiving a wireless signal, and at least a sensing means. And a control means for controlling the wireless transmission means to transmit the fire detection information by a wireless signal when a fire is detected by the wireless communication means, and the receiving device is a wireless transmission means for transmitting the wireless signal, and a wireless for receiving the wireless signal. A reception means, a wireless transmission means and a control means for controlling the wireless reception means. The control means of the reception device periodically sends a transmission request message requesting a predetermined response from the wireless transmission means to all fire detectors. Target When a transmission request message is received, the control unit of the fire detector sends a predetermined response message indicating the operation state of the own device to the receiving device from the wireless transmission unit as a wireless signal. The control means for the apparatus and the fire detector includes one downstream time slot from the receiving device to the fire detector, and a plurality of upstream times from the fire detector to the receiving device assigned to each fire detector. A fire alarm system for exchanging a transmission request message and a response message in a super frame in which a certain number of frames composed of slots are collected, and for each fire detector, the fire detector and one or more other ones The receiving device is provided with storage means for storing the combination with the fire detector, and the control means of the receiving device is combined with the fire detector that has not received the response message. The other fire detector is searched from the storage means, and a transfer request message for requesting transfer of the response message is transmitted to the other fire detector by a wireless signal from the wireless transmission means in a downlink time slot, The control means of the other fire detector that has received the transfer request message receives the wireless signal transmitted from the fire detector by the wireless receiving means, and the response message stored therein is assigned to the own device. It is characterized in that it is transmitted by a radio signal from a radio transmission means in a time slot.

  According to a sixth aspect of the invention, in the fifth aspect of the invention, the combination of fire detectors stored in the storage means of the receiving device is determined based on the line-of-sight distance between the fire detectors or the signal strength of the radio signal. Features.

  The invention according to claim 7 is the invention according to claim 5, wherein the combination of fire detectors stored in the storage means of the receiving device is one fire detector and a plurality of other fires installed around the fire detector. It consists of a combination with a sensor.

  According to the invention of claim 1, when each fire detector receives and stores the response message of the other fire detector, and the receiving device cannot receive the response message of any of the fire detectors. Since a transfer request message requesting transfer of the response message of the fire detector is transmitted to all the fire detectors, the response message is transferred from the other fire detectors to the receiving device in response to the request. The response message returned from the sensor can be reliably received by the receiving device.

  According to the second aspect of the present invention, since a plurality of other fire detectors do not transfer the response message in response to the transfer request message, the traffic can be reduced.

  According to the invention of claim 3, when an error in receiving a response message occurs again in the same fire detector, among other fire detectors having a track record of transferring the response message of the fire detector in the first reception error. Since the transfer request message is transmitted to the fire detector with the highest signal strength and only the other fire detector transmits the response message, the response message can be received more reliably by the receiving device and the traffic is reduced. be able to.

  According to the invention of claim 4, when an error in receiving a response message occurs again in the same fire detector, another fire detector with a track record of transferring the response message of the fire detector in the first reception error. Since the transfer request message is transmitted and only the other fire detector transmits the response message, the response message can be received more reliably by the receiving device and the traffic can be reduced. Since the previous fire detectors are sequentially changed, it is possible to prevent only the traffic of a specific fire detector from increasing.

  According to the invention of claim 5, each fire sensor can receive and store a response message of another fire sensor that has been combined in advance, and the reception device can receive the response message of any fire sensor. If not, a transfer request message for requesting transfer of the response message of the fire detector is transmitted to the other fire detector combined, and the response message is sent from the other fire detector to the receiving device in response to the request. Therefore, the response message returned from the fire detector can be reliably received by the receiving device. The combination is determined based on the line-of-sight distance between the fire detectors or the signal strength of the radio signal, as in the invention of claim 6, or one fire detection as in the invention of claim 7. It is desirable to combine a firearm with a number of other fire detectors installed around it.

  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, in which a plurality of receiving devices (wireless repeaters 1) that perform wireless communication with a plurality of fire detectors 10 are centrally monitored via a signal line Ls. A fire alarm system is configured by being connected to the panel 100. That is, the fire detection information transmitted from the fire detector 10 is transmitted from the wireless repeater 1 to the central monitoring panel 100 via the signal line Ls, and an alarm sound and a fire occurrence place are controlled under the control of the central monitoring panel 100. Necessary countermeasures such as reporting to the fire department and reporting to the fire department are performed. In the following description, when a plurality of fire detectors 10 are indicated individually, they are indicated as fire detectors 10 ₁ , 10 ₂ ,..., 10 _n, and when collectively indicated, they are indicated as fire detectors 10.

  The fire detector 10 is installed, for example, on the ceiling of a facility, and as shown in FIG. 1, sensing means (not shown) for detecting a fire by detecting temperature changes and smoke generated by the fire. ), An antenna 11 for transmitting and receiving a radio signal using radio waves as a medium, a sensor transmission means 12 that modulates a data format, which will be described later, into a carrier wave of a prescribed frequency, and outputs it to the antenna 11; Sensor receiving means 13 for demodulating a data format from a radio signal, a sensor for controlling the sensor transmitting means 12 and the sensor receiving means 13 to send and receive fire detection information, a reply request message and a response message to be described later by radio signals And control means 14. The sensor control means 14 includes a microcomputer and a nonvolatile memory such as an EEPROM as main components, and executes various processes described later by executing a program stored in the nonvolatile memory. Each fire detector 10 is given a unique address at the time of manufacture or construction and is stored in the nonvolatile memory of the detector control means 14.

  On the other hand, the wireless repeater 1 is installed in a communication area with the fire detector 10, for example, and is connected to a central monitoring panel 100 installed in a management room of the facility by a signal line Ls. As shown, an antenna 2 for transmitting and receiving a radio signal, a repeater transmission means 3 that modulates the data format into a carrier wave of a prescribed frequency and outputs it to the antenna 2, and a data format demodulated from the radio signal received by the antenna 2 And a repeater control means 5 that controls the repeater transmission means 3 and the repeater reception means 4 to transmit and receive fire detection information, a reply request message, and a response message by radio signals. The repeater control means 5 includes a microcomputer and a nonvolatile memory such as an EEPROM as main components, and executes various processes described later by executing a program stored in the nonvolatile memory. Note that a unique address different from that of the fire detector 10 is assigned to the wireless repeater 1 at the time of manufacture or construction, and is stored in the nonvolatile memory of the repeater control means 5.

  Here, a frequency that does not require a license is used for wireless communication between the wireless repeater 1 and the fire detector 10. For example, radio characteristics conforming to low power security and specific low power radio standards in Japan, FCC Regulations Part 15 SubpartC in the US, and Short Range Device standards in Europe must be satisfied.

  The data format of data exchanged between the wireless repeater 1 and the fire detector 10 is shown in FIG. This data format includes a 32-bit preamble (bit synchronization pattern) PR in which 1 and 0 alternate, a 16-bit unique word (frame synchronization pattern) UW consisting of a prescribed bit string, one wireless repeater 1 and its A 32-bit unique ID (system ID) SysID assigned to a subsystem consisting of a plurality of fire detectors 10 communicating wirelessly with the wireless repeater 1, and an 8-bit unique ID assigned to each fire detector 10 (Sensor ID) It is composed of a NodeID, a 16-bit message Msg, and a 16-bit error detection code CRC. That is, the unique address of the fire detector 10 is system ID + sensor ID, and the unique address of the wireless repeater 1 is system ID.

  When the wireless repeater 1 designates a specific fire sensor 10 in the subsystem and transmits a message, the sensor ID of the fire sensor 10 is designated as the sensor ID of the data format, and the When a message is transmitted to all the fire detectors 10 by broadcasting, it is only necessary to specify “0” for the sensor ID of the data format and transmit it. Further, when the fire sensor 10 sends a reply to the wireless repeater 1, the sensor ID of its own device may be set to the sensor ID of the data format and transmitted.

  On the other hand, in the fire detector 10 and the wireless repeater 1 that have received the wireless signal, the sensor receiving means 13 and the repeater receiving means 4 amplify the received signal and demodulate the data format to detect the sensor control means 14 and the repeater. Output to the control means 5. The sensor control means 14 and the repeater control means 5 sample the data demodulated by the sensor reception means 13 and the repeater reception means 4 at a digital input port provided in the microcomputer, and perform bit timing during reception of the preamble PR. And a unique word is detected by shifting the next 16 consecutive received bits one bit at a time until it matches the specified unique word. Furthermore, the sensor receiving means 13 and the repeater receiving means 4 collate the received system ID and sensor ID with the unique address stored in the non-volatile memory, and when they match and no bit error is detected. The message Msg is accepted.

  By the way, in this embodiment, the radio | wireless communication between the radio repeater 1 and the some fire detector 10 is performed by a time division multiple access (TDMA) system. That is, as shown in FIG. 4, one downlink direction (wireless repeater 1 → fire detector 10) time slot B and a plurality (99 in the illustrated example) of upward slots (fire detector 10 → wireless repeater 1). A plurality of (30 in the illustrated example) frames F1 to F30 including the time slots D1 to D99 are collected to form a super frame SF, and the upstream time slots D1 to D99 in the frames F1 to F30 are assigned to the fire detectors. When the interval between periodic message exchanges (reply request message and response message exchange) is relatively short, for example, once every 300 seconds in the above-mentioned EN standard. However, the collision of the radio signals transmitted from the fire detector 10 can be surely avoided. The time slots B and Di (i = 1 to 99) in the down direction and the up direction have a period of 100 milliseconds. The breakdown is 50 milliseconds in the above data format, the repeater transmission means 3 of the wireless repeater 1 and the fire. The time (start-up time) until the sensor transmission means 12 of the sensor 10 is started and transmission is possible at a stable carrier frequency is assigned 20 milliseconds, and the guard time is assigned 15 milliseconds each before and after. The guard time absorbs the timing difference caused by the error in the operation clock frequency of the fire detector 10 and the wireless repeater 1 (the operation clock frequency of the microcomputer constituting the detector control means 14 and the repeater control means 5). It is free time for. Also, the allocation of the upstream time slots D1 to D99 to each fire detector 10 is set by, for example, a dip switch provided in the fire detector 10, or in advance in the nonvolatile memory of the detector control means 14 in the manufacturing process. It may be stored, or may be performed by a method such as assigning each fire detector 10 in order from the wireless repeater 1 using wireless communication at the time of installation and storing it in the nonvolatile memory of the sensor control means 14.

  Next, the operation of this embodiment will be described. First, a reply request message is periodically transmitted from the wireless repeater 1 to all the fire detectors 10, and a response message returned from each fire detector 10 is received by the wireless repeater 1. The operation for confirming whether or not the fire detector 10 is operating normally will be described with reference to the flowchart of FIG.

  When the power is turned on, the repeater control means 5 of the wireless repeater 1 sets the sensor ID of the data format to “0” in the downstream time slot B of the first frame F1 of the super frame SF, and as a message Msg A reply request message is broadcast to all the fire detectors 10. On the other hand, in the fire detector 10, immediately after the power is turned on, the detector control means 14 activates the sensor receiving means 13 until the synchronization signal (reply request message) is received (see FIG. 5). Steps S1, S2). If the reply request message can be received, the detector control means 14 of the fire detector 10 activates the first timer, the second timer, and the third timer built in the microcomputer (step S3 in FIG. 5). The first timer is the time from the end of the downlink time slot B in the first frame F1 to the end of the superframe SF (for example, each of the frames F1 to F30 is 10 seconds, the superframe SF is 300 seconds, If the time slot in each of the downstream and upstream directions is 100 milliseconds, 300−0.1 = 299.9 seconds) is counted. In addition, the second timer is configured so that the upstream time slot Di (i = 1 to 99) individually assigned to each fire detector 10 from the time when the downstream time slot B ends in each frame Fk (k = 1 to 30). ) Is counted (for example, 0.1 × (number of upstream time slot Di i−1)). Further, the third timer is a time (for example, 10−0.1 = 9.9) from the time when the downlink time slot B ends in each frame Fk (k = 1 to 30) to the time when the frame Fk ends. Seconds).

  The sensor control means 14 of each fire sensor 10 operates the sensor receiving means 13 until the count of the second timer is completed, and in the upstream time slot before the upstream time slot assigned to itself. A wireless signal is received to obtain a response message from another fire sensor 10, and the obtained response message is stored in a nonvolatile memory in association with the sensor ID of the other fire sensor 10 (FIG. 5). Step 4). In addition, the sensor control means 14 can determine the start point of the upstream time slot Di assigned to itself by the end of the counting of the second timer, and in the assigned upstream time slot Di. A response message of its own device to the reply request message of the wireless repeater 1 is transmitted from the sensor transmission means 12, and then a fourth timer built in the microcomputer is started (steps S5 and S6 in FIG. 5), and further sensing is performed. The receiver receiving means 13 is operated to receive a radio signal in an upstream time slot after the upstream time slot assigned to itself, to acquire a response message from another fire detector 10, and to the acquired response The message is stored in the nonvolatile memory in association with the sensor ID of the other fire sensor 10 (step 7 in FIG. 5). The fourth timer is a time from the end time of the uplink time slot Di assigned to itself in a certain frame Fk to the start time of the uplink time slot Di assigned to itself in the next frame Fk + 1 ( For example, 10−0.1 = 9.9 seconds) is counted.

  On the other hand, the repeater control means 5 of the wireless repeater 1 receives the response message returned from each fire detector 10 in the upstream time slots D1 to D99 in the first frame F1 that transmitted the reply request message. The content of the response message is the presence or absence of an abnormality in the fire detector 10 (for example, the battery voltage drops below a threshold value or the malfunction of the sensing unit 11), and the fire detector returns an abnormal response message. Ten sensor IDs are transmitted to the central monitoring board 100 via the signal line Ls to notify the system administrator.

  The sensor control means 14 of the fire sensor 10 receives the downstream time slot B in the second frame F2 by operating the sensor receiving means 13 when the third timer expires (step S8 in FIG. 5). S9).

By the way, even if the fire detector 10 is normal, there may be a case where the wireless repeater 1 cannot receive a response message from the fire detector 10 due to the influence of external noise, interference waves, or the like. For example, if the response message of the second uplink time slot D2 cannot be received by the radio repeater 1, the repeater control means 5 of the radio repeater 1 determines that the uplink time slot D2 in which the response message could not be received. all fire assigned a transfer request message to request the transfer of a response message corresponding to the detector ID of the fire detector 10 ₂ are as message Msg data format, the second downlink timeslot B frame F2 is Broadcast transmission to the sensor 10.

  Here, if the response messages from all the fire detectors 10 are normally received by the wireless repeater 1, the transfer request message should not be received in the downlink time slot B in the second frame F2. Therefore, when the sensor control means 14 of the fire sensor 10 does not receive the transfer request message (step S10 in FIG. 5), the sensor transmission means 12 and the sensor reception means 13 until the first timer expires. When the operation is stopped (step S11 in FIG. 5) and the first timer expires and the next superframe SF is started, the downstream time slot in the first frame F1 is operated by operating the sensor transmission means 12 again. B is received (step S12 in FIG. 5), the first to third timers are started, and the above-described processing is repeated for each superframe SF.

On the other hand, when the transfer request message is received in the downlink time slot B in the second frame F2, the sensor control means 14 of the other fire detectors 10 ₁ , 10 ₃ ,. It is checked whether or not a response message corresponding to the ID is stored in the non-volatile memory, and if it is stored, the response message is read and waits until the fourth timer ends (step S13 in FIG. 5). When the fourth timer expires, the response message read in the uplink time slots (D1, D3,...) Assigned to the device in the second frame F2 is transmitted (transferred) (step S14 in FIG. 5). . The sensor control unit 14 repeats the processes of steps S13 and S14 in the frame (for example, F2) that has received the transfer request message from the wireless repeater 1, and the frame that has not received the transfer request message (for example, F3). Until the last frame F30, that is, until the next super frame SF starts, the operations of the sensor transmitting means 12 and the sensor receiving means 13 are stopped.

  Next, the operation when a fire is detected by any of the fire detectors 10 will be described with reference to the flowchart of FIG. The following process performed by the control unit 13 of the fire detector 10 when a fire is detected is an interrupt process (subroutine) for the above-described process (main routine shown in the flowchart of FIG. 5) that is always repeated.

  The sensor control means 14 of the fire sensor 10 determines whether or not the second timer is counting when a fire is detected by a sensing means (not shown) (step S1 in FIG. 6). In other words, if the second timer is counting, the uplink time slot Di assigned in the frame Fk has not yet passed, so the uplink direction assigned to the own device when the second timer ends. The fire detection information is transmitted as a message Msg to the wireless repeater 1 by the time slot Di, and the fourth timer is started after the transmission (steps S2 and S3 in FIG. 6). If the second timer is not counting, the uplink time slot Di assigned in the frame Fk has already passed, so that the sensor control means 14 is the time when the fourth timer ends, that is, the next time. The fire detection information is transmitted as a message Msg to the wireless repeater 1 by the uplink time slot Di assigned in the frame Fk + 1 of the first frame, and the fourth timer is started after the transmission (steps S7 and S3 in FIG. 6).

  The repeater control means 5 of the wireless repeater 1 that has received the fire detection information from the fire detector 10 transmits the fire detection information to the central monitoring panel 100 via the signal line Ls, and the fire of the source of the fire detection information is transmitted. In the frame Fk + 1 (or Fk + 2) next to the frame Fk (or Fk + 1) that has received the fire detection information, with the reception completion message indicating that the sensor ID of the sensor 10 is specified and the fire detection information is received as the message Msg Transmit in downlink time slot B.

  In the sensor control means 14 of the fire detector 10 that has transmitted the fire detection information, the downstream time slot B in the next frame Fk + 1 (or Fk + 2) is set by operating the sensor receiving means 13 when the third timer ends. At the same time, the third timer is started again (steps S4 and S5 in FIG. 6). Furthermore, if the sensor control means 14 receives a reception completion message from the wireless repeater 1 in the downlink time slot B, the sensor control means 14 returns to the main routine (flow chart of FIG. 5) without retransmitting the fire detection information. However, if the wireless repeater 1 cannot receive fire detection information from the fire detector 10 due to the influence of external noise, interference waves, etc., the reception completion message is not transmitted from the wireless repeater 1. If the reception completion message is not received, the fire detection information is transmitted again in the uplink time slot assigned to itself in the next frame Fk + 2 (or k + 3) (step S8 in FIG. 6) and received from the wireless repeater 1 Until the completion message is received, retransmission of the fire detection information is repeated so that the wireless repeater 1 is surely notified of the occurrence of the fire. That is, the fire detector 10 that has detected a fire with the sensing means transmits the fire detection information to the wireless repeater 1 in the frame Fk + 1 next to the frame Fk at the time of detecting the fire at the latest. The fire detection information can be transmitted to the wireless repeater 1 within 10 seconds of the cycle, and the European EN standard (EN54-25) standard value (within 10 seconds from detection) can be satisfied.

  As described above, according to the present embodiment, the response messages transmitted from the other fire detectors 10 are received and stored in all the fire detectors 10, and the response message of any of the fire detectors 10 is stored. When the wireless repeater 1 fails to receive, a transfer request message for requesting the transfer of the response message of the fire detector 10 is broadcast from the wireless repeater 1 to all the fire detectors 10, and the transfer request is sent. In response to the message, the other fire detector 10 that has received and stored the response message of the other fire detector 10 transfers the response message, so the response message returned from the fire detector 10 is relayed wirelessly. The device 1 can reliably receive the data.

  By the way, in this embodiment, the response message is transferred according to the transfer request message from all the other fire detectors 10 storing the corresponding response message, but the other fire detectors 10 transfer the response message. If the sensor receiving means 13 receives a wireless signal to be transmitted, the sensor control means 14 can prevent a plurality of fire detectors from transmitting response messages in the upstream time slot assigned to the sensor receiving means 13. Since 10 does not redundantly transfer the response message to the transfer request message, traffic can be reduced.

When, for example in the same fire detector 10 ₂ situations can not receive the response message in the wireless relay 1 followed, other fire against the repeater control unit 5 of the radio repeater 1, the first transfer request message Measures the signal strength of the response message (wireless signal) transferred by the sensors 10 ₁ , 10 ₃ ,..., And stores the combination with the fire sensor (for example, 10 ₃ ) having the highest signal strength in the nonvolatile memory. The second and subsequent transfer request messages are transmitted only to the one fire detector 10 ₃ combined with the highest signal strength, and only the one fire detector 10 ₃ sends a response message. if configured to transfer, each fire detector 10 ₁ of a plurality, 10 _3, than to transfer the reply message to ..., more reliably receive the response message at the wireless repeater 1 Rutotomoni can reduce traffic.

Alternatively, a combination of a fire detector (for example, 10 ₂ ) for which no response message has been received and other fire detectors 10 ₁ , 10 ₃ ,. The repeater control means 5 stores it in the non-volatile memory, and for the second and subsequent transfer request messages, one unit selected in order from the stored combination, for example, the first fire detector 10 ₁ , the second fire. send only to detector 10 _3, the fire detector 10 ₁ in one such, 10 _3, be configured such that only ... forwards a response message, more reliably receive the response message at the wireless repeater 1 And the traffic can be reduced, and since the fire detector 10 to which the transfer request message is transmitted is sequentially changed, the traffic of the specific fire detector 10 is changed. Ikku only can be prevented from increasing.

By the way, each fire sensor 10 is combined with another fire sensor 10 that forwards the response message of the fire sensor 10 when the response message is not received by the wireless repeater 1, for example, the fire sensor 10 ₁ and 10 ₂ , 10 ₂ and 10 ₃ , one pair each, or 10 ₁ and 10 ₂ and 10 ₃ , 10 ₂ and 10 ₃ and 10 ₄ , and so on A combination of a plurality of units is determined in advance and stored in the non-volatile memory of the repeater control means 5, and if no response message is received from any of the fire detectors 10, the repeater control means 5 is non-volatile. A transfer request message is transmitted only to any one of the fire sensors 10 combined with the fire sensor 10 stored in the memory, and only the fire sensor 10 is a response message. It is also possible to configure to transfer. In this case, the sensor control means 14 of each fire sensor 10 does not need to receive all the upstream time slots other than the upstream time slot assigned to the fire detector 10, and one or more combined ones or more It is only necessary to receive only the upstream time slot assigned to the fire detector 10 and store the response message.

  The combination of the fire detectors 10 stored in the non-volatile memory by the repeater control means 5 is the line-of-sight distance between the fire detectors 10 in the installed state, or the fire detector 10 is a radio signal of another fire detector 10. It is preferable to determine based on the signal strength at the time of receiving or to combine one fire detector 10 with a plurality of other fire detectors 10 installed around it. If a plurality of fire sensors 10 are combined with the sensor 10, the response message can be transferred more reliably.

It is a block diagram which shows embodiment of this invention. It is a system block diagram same as the above. It is explanatory drawing of the data format in the same as the above. It is a block diagram of the super frame in the same as the above. It is a flowchart for demonstrating the operation | movement of the periodic message exchange same as the above. It is a flowchart for demonstrating the operation | movement at the time of the fire detection in the same as the above.

Explanation of symbols

1 Wireless repeater (receiver)
5 relay control means 10 fire detector 12 sensor transmission means 13 sensor reception means 14 sensor control means

Claims (7)

A plurality of fire detectors for detecting a fire, and a receiver for performing wireless communication using radio waves as a medium between the fire detectors;
The fire detector includes at least sensing means for sensing a fire by detecting a temperature change and smoke generated by the fire, a wireless transmitting means for transmitting a wireless signal, and a wireless receiving means for receiving a wireless signal. Control means for controlling the wireless transmission means to transmit the fire detection information by a wireless signal when a fire is detected by the means,
The receiving apparatus includes a wireless transmission unit that transmits a wireless signal, a wireless reception unit that receives a wireless signal, a wireless transmission unit, and a control unit that controls the wireless reception unit.
The control means of the receiving device periodically transmits a transmission request message for requesting a predetermined response from all the wireless detectors to the fire detector by a wireless signal.
The control unit of the fire detector returns a predetermined response message indicating the operation state of the device when receiving a transmission request message to the receiving device by a wireless signal from the wireless transmission unit,
The control means of the receiving device and the fire detector includes one downstream time slot from the receiving device to the fire detector, and a plurality of upstream directions from the fire detector assigned to each fire detector to the receiving device. A fire alarm system that exchanges a transmission request message and a response message in a superframe in which a certain number of frames composed of time slots are gathered,
The control means of the receiving device transmits a transfer request message for requesting transfer of the response message of the fire detector, which has not received the response message, to all the fire detectors in a downlink time slot as a wireless signal from the wireless transmission means. Send
The control unit of the fire detector stores the response message of the wireless signal transmitted from the other fire detector and received by the wireless receiving unit, and when the transfer request message is received from the receiving device, the stored other A fire alarm system characterized in that a response message of the fire detector is transmitted as a wireless signal from a wireless transmission means in an uplink time slot assigned to the fire detector.   The control means of the fire detector, when receiving the wireless signal of the response message to the transfer request message in the upstream time slot prior to the upstream time slot assigned to the own equipment, the upstream direction assigned to the own equipment 2. The fire alarm system according to claim 1, wherein no radio signal is transmitted in a time slot. The receiving apparatus includes signal strength detection means for detecting the signal strength of a radio signal received by the wireless receiving means,
The control means of the receiving device detects the signal strength among the fire detector that did not receive the response message in the previous superframe and the other fire detectors that transmitted the response message of the fire detector. Memorize the combination with the fire detector with the highest signal intensity detected by the means, and when the response message of the same fire detector is not received again in the superframe after this time, the combination with the fire detector 2. The fire alarm system according to claim 1, wherein the transfer request message is transmitted only to other stored fire detectors.   The control means of the receiver stores a combination of a fire detector that has not received a response message in the previous superframe and a plurality of other fire detectors that have transmitted the response message of the fire detector. When the response message of the same fire sensor is not received again in the superframe after this time, it is transferred only to one of the other fire sensors storing the combination with the fire sensor. 2. The fire alarm system according to claim 1, wherein other fire detectors that transmit the request message and that are the transmission destination of the transfer request message are sequentially changed every superframe. A plurality of fire detectors for detecting a fire, and a receiver for performing wireless communication using radio waves as a medium between the fire detectors;
The fire detector includes at least sensing means for sensing a fire by detecting a temperature change and smoke generated by the fire, a wireless transmitting means for transmitting a wireless signal, and a wireless receiving means for receiving a wireless signal. Control means for controlling the wireless transmission means to transmit the fire detection information by a wireless signal when a fire is detected by the means,
The receiving apparatus includes a wireless transmission unit that transmits a wireless signal, a wireless reception unit that receives a wireless signal, a wireless transmission unit, and a control unit that controls the wireless reception unit.
The control means of the receiving device periodically transmits a transmission request message for requesting a predetermined response from all the wireless detectors to the fire detector by a wireless signal.
The control unit of the fire detector returns a predetermined response message indicating the operation state of the device when receiving a transmission request message to the receiving device by a wireless signal from the wireless transmission unit,
The control means of the receiving device and the fire detector includes one downstream time slot from the receiving device to the fire detector, and a plurality of upstream directions from the fire detector assigned to each fire detector to the receiving device. A fire alarm system that exchanges a transmission request message and a response message in a superframe in which a certain number of frames composed of time slots are gathered,
For each fire detector, the receiving device is provided with storage means for storing a combination of the fire detector and one or more other fire detectors,
The control means of the receiving device searches the storage means for another fire sensor combined with the fire sensor for which the response message could not be received, and sends a transfer request message for requesting the transfer of the response message to the other fire sensor. Transmitting by radio signal from the radio transmission means in the downlink time slot
The control means of the other fire detector that has received the transfer request message receives the wireless signal transmitted from the fire detector by the wireless receiving means, and the response message stored therein is assigned to the own device. A fire alarm system, wherein a radio signal is transmitted from a wireless transmission means in a time slot.   6. The fire alarm system according to claim 5, wherein the combination of fire detectors stored in the storage means of the receiving device is determined based on a line-of-sight distance between the fire detectors or a signal strength of a radio signal.   The combination of fire detectors stored in the storage means of the receiving device is a combination of one fire detector and a plurality of other fire detectors installed around the fire detector. 5. The fire alarm system according to 5.

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