JP2012215991A - Fire alarm facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire alarm facility capable of restricting current consumption required for relay processing of wireless signals.SOLUTION: A fire alarm facility 100 includes lower-level devices in a communication hierarchy performing state collection processing for transmitting state information signals including their own device state information on the basis of state request signals transmitted from a higher-level device in the communication hierarchy. In the state collection processing, a wireless relay B, a repeater relay C, and a sensor D transmit a state request signal or a state information signal to a transmission destination, if the device of the transmission destination is a wireless relay B or a repeater relay C, and thereafter, the wireless relay B or the repeater relay C of the transmission destination actuates a predetermined time reception function and performs reception processing to receive the state request signal or the state information signal to be transmitted to its relay destination.

Description

  The present invention relates to a fire alarm facility including a sensor, a fire receiver, and the like, and more particularly, to a fire alarm facility in which a part of various signals is converted into a radio signal.

  2. Description of the Related Art Conventionally, as a wireless communication system used for an automatic meter reading system, a security system, or the like, a wireless communication device having a hierarchical structure is known. As such a wireless communication system, “the wireless slave units 3 and 4 relay data transmitted from wireless slave units located at the lower level of the hierarchical structure to the upper level of the hierarchical structure, thereby The data is delivered to the wireless master device 2 and further delivered to the center device 1 ”(see, for example, Patent Document 1).

JP 2008-312062 A (page 4, FIG. 1, FIG. 2, FIG. 5)

  In the technique described in Patent Document 1, each device (master device, slave device), for example, receives a start command from a higher-level device, transmits a response command to the higher-level device, and further The start command is sent to the device of the next level. As described above, when relaying a signal, a device located in the middle layer needs to transmit a response signal to the relay source and transmit a relay signal to the relay destination. Therefore, the device that relays the signal needs to transmit the signal twice in the relay process, resulting in an increase in current consumption. In particular, as the communication hierarchical structure increases, the current consumption required for signal relaying in the entire system increases, and a reduction in current consumption has been desired.

  The present invention has been made to solve the above-described problems, and provides a fire alarm facility capable of suppressing current consumption required for relay processing of a radio signal.

  A fire alarm facility according to the present invention includes a sensor that detects an environmental change based on a fire phenomenon and transmits / receives a wireless signal, a fire receiver that monitors and controls the sensor, and the sensor and the fire receiver. One or a plurality of repeaters that interpose between and configure a plurality of communication layers to relay radio signals, and based on a status request signal transmitted from an upper device in the communication layer, a lower device in the communication layer Is a fire alarm facility for performing a state collection process for transmitting a state information signal including its own device state information, wherein in the state collection process, the one or more relays and the sensor are configured to receive the state request signal. Or, when the destination device of the state information signal is the repeater, after transmitting the state request signal or the state information signal to the destination repeater, the destination repeater is the relay destination. For receiving the state request signal or the status information signal sent for, and performs reception processing by starting a predetermined time reception function.

  According to the fire alarm facility according to the present invention, in the state collection process, the repeater and the sensor receive the state request signal or the state information signal when the destination device of the state request signal or the state information signal is a repeater. After the transmission to the transmission destination repeater, in order to receive the status request signal or the status information signal transmitted to the transmission destination by the transmission destination repeater, the reception function is activated for a predetermined time. Since the repeater and the sensor do not transmit a response signal indicating that the state request signal or the state information signal has been received to the relay source, it is possible to suppress current consumption required for signal relay processing. Moreover, since the number of signals transmitted and received in the state collection process of the fire alarm facility can be reduced, communication traffic can be suppressed, and early transmission of a fire signal when a fire or the like is detected can be realized.

It is a system configuration figure of the fire alarm equipment concerning an embodiment. It is a block diagram which shows the main structures of the sensor which concerns on embodiment. It is a block diagram which shows the main structures of the repeater repeater which concerns on embodiment. It is a block diagram which shows the main structures of the radio | wireless repeater which concerns on embodiment. It is a figure explaining the communication message | telegram transmitted with respect to a wireless repeater or a repeater repeater in the state collection process and fire notification process of embodiment. It is a figure explaining the communication message | telegram transmitted to the sensor and the communication message | telegram which a sensor transmits in the state collection process of embodiment. It is a figure explaining the communication message | telegram which a repeater repeater transmits in the state collection process of embodiment. It is a figure explaining the state collection process which concerns on embodiment. It is a figure explaining the fire notification process which concerns on embodiment. It is a figure explaining the operation example when a sensor detects a fire during the state collection process which concerns on embodiment.

Embodiment 1 FIG.
(Configuration of fire alarm equipment)
First, the fire alarm facility according to the present embodiment will be described.
FIG. 1 is a system configuration diagram of a fire alarm facility according to the first embodiment. The fire alarm facility shown in FIG. 1 is a system that is installed in a building to be monitored and notifies when an occurrence of a fire is detected.

As shown in FIG. 1, the fire alarm system 100 according to the embodiment includes a fire receiver A, a wireless repeater B1 connected to the fire receiver A by a transmission line CL1, and a transmission line to the fire receiver A. And a wireless repeater B2 connected by CL2. Hereinafter, the wireless repeaters B1 and B2 may be collectively referred to as a wireless repeater B. The wireless repeater B is wired to the fire receiver A and operates by receiving power supply.
Sensors D11, D12, D21, D22, D31, D32, D41, D42, and D43 (hereinafter may be collectively referred to as sensor D) are installed in a room or the like of a building to be monitored.
Also, a repeater repeater C1 that relays a radio signal interposed between the wireless repeater B1 and the sensors D21 and D22, and a wireless repeater interposed between the wireless repeater B1 and the sensors D31 and D32. Repeater repeaters C2 and C3 for relaying signals. Hereinafter, the repeater repeaters C1, C2, and C3 may be collectively referred to as repeater repeaters C.
The wireless repeater B1 and the repeater repeater C (one or more) have a communication hierarchical structure, and transmit and receive radio signals from an upper layer to a lower layer or from a lower layer to an upper layer.

Here, a set of devices that perform wireless transmission and reception between each wireless repeater B and the wireless repeater B is referred to as a group. That is, one group is formed for each wireless repeater B. In the example of FIG. 1, the repeater repeater C and the sensor D that perform wireless transmission / reception with the wireless repeater B1 and the wireless repeater B1 are referred to as a group G1. In addition, the wireless repeater B2 and the sensor D that performs wireless transmission / reception with the wireless repeater B2 are referred to as a group G2.
In each group, a plurality of communication paths with the wireless repeater B as a base point can be provided. In the example of the group G1 in FIG. 1, the sensors D11 and D12 that perform direct transmission and reception with the wireless relay B are the communication path F1, the repeater relay C1, and the sensors D21 and D22 that perform transmission and reception via this are the communication path F2. The repeater repeaters C2 and C3 and the sensors D31 and D32 that transmit and receive via the repeater repeaters C2 and C3 are the communication path F3. Further, in the example of the group G2 in FIG. 1, one communication path F4 including sensors D41, D42, and D43 that directly transmit and receive with the wireless relay B2 is provided. For example, the communication frequency between devices can be set to the same setting for each group, but is not limited to this.

(Sensor D)
The sensor D detects a physical quantity or a physical change of the detection target based on the fire phenomenon, and transmits a state signal corresponding to the detected content as a radio signal. The sensor D is, for example, a so-called smoke detector that outputs an analog value based on the detected smoke concentration or a fire signal as a radio signal, or a so-called heat that outputs an analog value or fire signal based on the detected ambient temperature as a radio signal. It is a sensor for detecting a fire, such as a sensor. The sensor D can transmit and receive a radio signal to / from the wireless repeater B or the repeater repeater C.

  FIG. 2 is a block diagram showing a main configuration of the wireless sensor D according to the embodiment. The sensor D includes a control circuit 1, a battery 2, a constant voltage circuit 3, a voltage detection circuit 4, a transmission / reception circuit 5, an antenna 6, a fire detection circuit 7, an indicator lamp circuit 8, and a registration switch 9.

  The battery 2 supplies DC power to the constant voltage circuit 3. The constant voltage circuit 3 controls the voltage of the battery 2 to a predetermined voltage and supplies it to the control circuit 1, the transmission / reception circuit 5, the fire detection circuit 7, and the indicator lamp circuit 8.

  The voltage detection circuit 4 detects the voltage of the battery 2 applied to the constant voltage circuit 3 and outputs a battery voltage detection signal corresponding to the detected voltage to the control circuit 1. When the voltage detection circuit 4 detects that the remaining battery level has dropped or exceeds the threshold value for running out of the battery, the voltage detection circuit 4 outputs it to the control circuit 1, thereby causing the control circuit 1 to drive the indicator lamp circuit 8. Then, the state signal including the state information indicating that the battery is dead is output from the transmission / reception circuit 5.

  The fire detection circuit 7 detects a physical quantity or a physical change of an object to be detected such as smoke or heat based on a fire phenomenon, and outputs a state signal corresponding to the detected content to the control circuit 1. The indicator lamp circuit 8 is a circuit that controls the lighting operation of indicator lamps such as light emitting diodes.

The transmission / reception circuit 5 is connected to an antenna 6 for transmitting / receiving a radio signal, and includes a transmission circuit 5a and a reception circuit 5b. The reception circuit 5b performs a reception sampling operation at a predetermined period to detect a radio signal input from the antenna 6, and performs reception processing according to the content of the radio signal if it is addressed to itself. Then, the reception circuit 5b outputs the signal subjected to the reception process to the control circuit 1. The transmission circuit 5a is controlled by the control circuit 1 to perform transmission processing of signals such as status signals.
The registration switch 9 is a switch used when registering information such as a communication path necessary for transmitting and receiving a radio signal within a group.

  The control circuit 1 has a function as a state determination unit that determines a fire state and the like based on a signal output from the fire detection circuit 7. If it is determined that there is a fire condition, the indicator lamp circuit 8 is controlled to issue an alarm with the indicator lamp. Moreover, while performing a required process based on the signal which the transmission / reception circuit 5 received, the transmission / reception circuit 5 is controlled as needed and signals, such as a status signal and a fire signal, are transmitted to another apparatus.

  The storage element 1a is a nonvolatile memory such as an EEPROM, and stores programs executed by the control circuit 1 and various data.

(Repeater repeater C)
The repeater repeater C is interposed between the wireless repeater B and the sensor D and relays wireless signals. That is, the repeater repeater C expands the reach of the radio wave when the radio repeater B and the sensor D do not reach each other. Like the repeater repeaters C2 and C3 shown in the group G1 in FIG. 1, two or more repeater repeaters C may be provided between the wireless repeater B and the sensor D for relay.

FIG. 3 is a block diagram showing a main configuration of repeater repeater C according to the embodiment of repeater repeater C. The repeater repeater C includes a control circuit 11, a battery 2, a constant voltage circuit 3, a voltage detection circuit 4, a transmission / reception circuit 5, an antenna 6, an indicator lamp circuit 8, and a registration switch 9. The repeater repeater C does not include the fire detection circuit 7 unlike the sensor D described above, and the operation content of the control circuit 11 and the information stored in the storage element 11a are partially different. Is basically the same as sensor D.
For example, the repeater repeater C may be provided with a fire detection circuit 7 as shown in the fire detector D of FIG. 2 or a sensor for detecting smoke, heat, etc., so that the repeater repeater C has a fire detection function.

(Wireless repeater B)
The wireless repeater B has a function of transmitting and receiving a wireless signal between the sensor D and the repeater repeater C and transmitting a wireless signal from the sensor D or the repeater repeater C to the fire receiver A.

FIG. 4 is a block diagram showing a main configuration of the wireless repeater B according to the embodiment.
The wireless repeater B includes a control circuit 21, a constant voltage circuit 3, a voltage detection circuit 4, a transmission / reception circuit 5, an antenna 6, an indicator lamp circuit 8, a registration switch 9, a receiver I / F circuit 22, and a power line terminal 20a. And a signal line terminal 20b. The wireless repeater B is not battery-driven like the above-described sensor D and repeater repeater C, but is connected to the DC from the fire receiver A via the power line connecting the fire receiver A and the power line terminal 20a. Powered. In addition, the fire receiver A and the signal line terminal 20 b are connected by a signal line, and the wireless repeater B transmits and receives signals to and from the fire receiver A via the receiver I / F circuit 22. Although the operation contents of the control circuit 21 and the information stored in the storage element 21a are partially different, other configurations are basically the same as those of the sensor D and the repeater repeater C.

(Overview of fire alarm equipment operation)
The first major operation of the fire alarm system 100 is fire monitoring. Specifically, each sensor D monitors the presence or absence of a fire in its own monitoring area. When the sensor D detects a change in the environment such as smoke or heat due to a fire, this detection information is transmitted to the wireless repeater B through a wireless signal via the repeater repeater C or directly. Further, detection information is transmitted from the wireless repeater B to the fire receiver A. Upon receiving the fire detection information, the fire receiver A controls a sound alarm device (not shown) to notify the fire, and operates a fire door, a smoke evacuator, a shutter (not shown) and the like to prevent the spread of fire.
The second main operation of the fire alarm system 100 is a state collection process. In the fire alarm system 100, if a battery runs out or a wireless communication failure occurs in each device constituting the fire alarm facility 100, the fire notification cannot be performed. In order to prevent such a problem from occurring, a state collection process for collecting the state of each device (battery state, wireless communication function state, etc.) at a predetermined cycle is performed.

In the above-described fire monitoring and status collection transmission / reception processing, communication is performed using radio signals.
The wireless repeater B and the repeater repeater C are interposed between the fire receiver A and the sensor D, and function as a repeater that relays wireless communication to be performed between them.

Moreover, in each device constituting the fire alarm facility 100, information necessary for transmitting and receiving signals is stored in the storage element of each device. The information stored in the storage element includes at least a group ID, a self address, a higher device address, a lower device address, and a device number.
The group ID is an ID uniquely assigned to each group shown in FIG. This group ID is set for all devices of the wireless repeater B, the repeater repeater C, and the sensor D.
The self address is a communication address uniquely assigned to each device, and is set for all devices of the wireless repeater B, the repeater repeater C, and the sensor D.

The upper device address is an address of a device located immediately above itself in the communication hierarchy. Here, the upper level means a side closer to the fire receiver A with respect to each device. For example, in the group G1 in FIG. 1, the upper device of the repeater relay C1 is the wireless relay device B1, and the higher devices of the sensors D21 and D22 are the repeater relay C1. This higher device address is set for the repeater repeater C and the sensor D.
The lower device address is an address of a device located immediately below itself in the communication hierarchy. Here, the low order means the side far from the fire receiver A with respect to each device. For example, in the group G1 of FIG. 1, the low-order device of the repeater repeater C2 is the repeater repeater C3, and the low-order devices of the repeater repeater C3 are the sensors D31 and D32. The lower device address is set for the wireless repeater B and the repeater repeater C.

  The device number is a number uniquely assigned to each terminal in the same type of device belonging to one group. For example, in the present embodiment, the maximum number of repeater repeaters C that can be connected to one group is six, and each repeater repeater C is assigned a device number of 01 to 06. In the present embodiment, the maximum number of sensors D that can be connected to one group is 30, and each sensor D is assigned a device number of 01 to 30. In this embodiment, an example in which a self address and a device number are provided separately is shown, but a self address that is information unique to each device can also be used as a device number.

Here, an outline of a registration process for registering information such as a communication path necessary for transmitting and receiving a radio signal in a group in each device will be described.
First, the wireless repeater B and the repeater repeater C, which are host devices, have a mode called a registration mode as an operation mode for registering a communication path. Further, the repeater repeater C and the sensor D, which are lower devices, can transmit a registration request signal for requesting registration of a communication path.
In such a configuration, a registration request signal including its own address is transmitted from the lower device (repeater repeater C or sensor D) to the upper device (wireless repeater B or repeater repeater C) in the registration mode state. Then, the upper device sets the address included in the registration request signal as its lower device address, and transmits a registration signal including the self address to the lower device. The lower device (repeater repeater C or sensor D) that has received this registration signal sets the address included in the registration signal as its upper device address. By performing such processing for each device constituting the communication path, the communication path is established. The transition to the registration mode and the transmission of the registration request signal are executed by operating the registration switch 9 by the user. Further, this registration process can be performed when newly installing the fire alarm facility 100, or when adding equipment after the fire alarm facility 100 is installed.

(Outline of send / receive processing)
Next, an outline of transmission / reception processing in the fire alarm facility 100 will be described.
The main transmission / reception processes of radio signals in the fire alarm system 100 are (1) state collection process and (2) fire notification process.

(1) State collection process In the state collection process, the wireless relay B collects state information (for example, battery state) of devices (repeater repeater C, sensor D) that transmit and receive wireless signals to and from itself. It is processing. The wireless repeater B transmits a status request signal for requesting its subordinate device to transmit the status information of the device itself, and the device that has received the status request signal further transmits to the subordinate device thereof. To send a status request signal. This state request signal is relayed to the end of the communication path, and the sensor D, which is the terminal device, transmits a signal including its own state information as a state information signal to the host device. The host device that has received this state information signal adds a signal including its own state information to the received signal, and transmits the signal as a state information signal to the host device. This state information signal is transmitted in sequence until reaching the wireless repeater B which is the highest-level device in the communication path. Then, the wireless repeater B determines the state of the state information signal collected from the lower device, and transmits the information included in the state information signal to the fire receiver A if necessary.

  The state collection process is performed for each wireless communication path. That is, in the example of FIG. 1, first, the wireless repeater B1 performs state collection processing between the sensors D11 and D12 (communication path F1), and when this is completed, the wireless repeater B1 becomes the repeater repeater C1. And the state collection processing is performed between the sensors D21 and D22 (communication path F2) that perform transmission and reception with this, and when this is completed, the wireless relay B1 repeaters repeaters C2 and C3 and the sensors that perform transmission and reception with the repeaters A state collection process is performed between D31 and D32 (communication path F3). The state collection processing may be performed at a predetermined cycle (for example, a 24-hour cycle), or the cycle of performing the state collection processing may be changed according to the situation such as the installation years of the fire alarm facility 100.

(2) Fire Notification Processing This is processing for transmitting a wireless signal based on the fire information detected by the sensor D to the fire receiver A via the wireless repeater B. The signal flow is in the order from the lower order device to the higher order device of the communication path: sensor D, repeater repeater C (only when intervening), wireless repeater B, and fire receiver A.

In addition, when transmitting a radio signal, it is necessary to transmit within the range of the transmission time set by the standard etc. In the present embodiment, an example will be described in which the transmission period is 3 seconds or shorter and the transmission pause time is 2 seconds or longer in accordance with the standard RCR STD-30.
In addition, the wireless repeater B, the repeater repeater C, and the sensor D basically perform intermittent reception of receiving wireless signals from other devices at predetermined intervals. In the present embodiment, the intermittent reception interval of the wireless repeater B is TB, the intermittent reception interval of the repeater repeater C is TC, and the intermittent reception interval of the sensor D is TD.

(Communication telegram)
Next, a communication message used in the fire alarm facility 100 according to the present embodiment will be described. The communication message described here is a communication message used in the above-described (1) state collection processing and (2) fire notification processing.
In the fire alarm system 100 according to the embodiment, the communication message to be used depends on the type of transmission / reception processing ((1) state collection processing or (2) fire notification processing), the type of the transmission source device, and the type of the reception source device. Is stipulated. First, each communication message will be specifically described.

FIG. 5 is a diagram illustrating a communication message transmitted to the wireless repeater or the repeater repeater in the state collection process and the fire notification process according to the embodiment.
The communication slot 110 shown in FIG. 5 includes a transmission source (wireless repeater B or repeater repeater C) to a repeater repeater C, or a transmission source (repeater repeater C or sensor D) to a wireless repeater B or A transmission slot 111 for transmitting a signal to the repeater repeater C and a continuous reception slot 112 for receiving a signal from another device.

The transmission slot 111 is composed of a plurality of (60 in this embodiment) basic frames 101 that are continuous. That is, in the transmission slot 111, the basic frame 101 is continuously transmitted a plurality of times. The basic frame 101 includes, for example, a synchronization signal, a group ID for identifying a transmission source, a transmission source address, a frame number, data, and the like.
The length of the transmission slot 111 is set to be longer than the length of the intermittent reception interval TB of the wireless repeater B and the intermittent reception interval TC of the repeater repeater C, and the wireless repeater B and the repeater repeater C Can receive any frame in the transmission slot 111.
Before starting transmission using the transmission slot 111, CS before transmission (carrier sense before transmission) is performed, and transmission is started after confirming that no other device is transmitting a radio signal.

  The continuous reception slot 112 is a transmission suspension period in which no radio signal is transmitted, and is a time period in which the reception circuit is activated to perform a radio signal reception process. The continuous reception slot 112 includes a fire transfer signal area 113, a fire notification signal area 114, and other signal areas 115. A fire transfer signal area 113 is an area for receiving a fire transfer signal transferred from another device, a fire notification signal area 114 is an area for receiving a fire notification signal transmitted from the sensor D, and other signals. The area 115 is an area for receiving a control request signal or a status request signal other than the fire transfer signal and the fire notification signal. Although details will be described later with reference to FIG. 10, other devices can transmit corresponding signals to the fire transfer signal area 113, the fire notification signal area 114, and the other signal areas 115. ing. In the present embodiment, areas are provided in the order of the fire transfer signal area 113, the fire notification signal area 114, and the other signal areas 115 in order of increasing importance of the radio signal.

  FIG. 6 is a diagram illustrating a communication message transmitted to the sensor and a communication message transmitted by the sensor in the state collection process according to the embodiment. 6A shows a communication message transmitted from the wireless repeater B or the repeater repeater C to the sensor D, and FIG. 6B shows a communication message transmitted from the sensor D. . FIG. 6B shows an example of transmission / reception operations of a plurality of detectors D having different intermittent reception timings.

  The block communication 120 shown in FIG. 6A includes a transmission slot 121, a continuous reception slot 122, a transmission slot 123, a continuous reception slot 124, a transmission slot 125, and a continuous reception slot 126. The transmission slots 121, 123, and 125 are composed of a plurality of continuous basic frames 101. That is, in the transmission slots 121, 123, and 125, the basic frame 101 is continuously transmitted a plurality of times. Before starting transmission by the transmission slot 121, CS before transmission (carrier sense before transmission) is performed, and transmission is started after confirming that no other device is transmitting a radio signal.

The continuous reception slots 122, 124, and 126 are transmission suspension periods during which no radio signal is transmitted, and the reception circuit is activated to perform radio signal reception processing.
In the block communication 120, a transmission period (transmission slot 121, 123, 125) for transmitting a radio signal and a transmission suspension period (continuous reception slot 122, 124, 126) for not transmitting a radio signal are alternately repeated.

Here, the time of each slot constituting the block communication 120 will be described. First, the radio signal transmission processing needs to be set in accordance with the standard as described above so that the transmission period is 3 seconds or less and the transmission pause time is 2 seconds or more. On the other hand, the sensor D on the receiving side performs intermittent reception every intermittent reception interval TD (7 seconds in the present embodiment), and the timing of intermittent reception of each sensor D may be different. Therefore, in order for each sensor D to receive a radio signal in intermittent reception, the timing of intermittent reception of each sensor D needs to be included in the transmission slot of the signal transmission source.
Therefore, in the block communication 120 of the present embodiment, the total time of the transmission slot 121, the continuous reception slot 122, and the transmission slot 123 is equal to or shorter than the intermittent reception interval TD (7 seconds) of the sensor D, and the continuous reception slot 122 ( The transmission slot 125 includes 7 seconds after the section T1) in FIG. In this way, all the detectors D can receive the radio signal transmitted in any one of the transmission slots 121, 123, and 125. That is, for example, even when the intermittent reception timing of a certain sensor D is included in the continuous reception slot 122, the sensor D receives the radio signal transmitted in the transmission slot 125 at the next intermittent reception timing. be able to.

  As shown in FIG. 6B, when the sensor D receives a wireless signal from the wireless repeater B or the repeater repeater C, the sensor D transmits a shortened frame 102. The shortened frame 102 includes, for example, a synchronization signal, a group ID for identifying a transmission source, a transmission source address, data, and the like.

Here, the timing at which the sensor D transmits the shortened frame 102 as a response signal will be described. First, the continuous reception slot 122 will be further described. As shown in FIG. 6A, the continuous reception slot 122 includes a sensor return slot 129 divided into areas for receiving radio signals from the respective sensors D. The sensor return slot 129 is divided into areas corresponding to the number of sensors D that can be connected to the group (in this embodiment, 30 areas).
When each sensor D receives any of the basic frames 101 transmitted in the transmission slots 121, 123, and 125, based on the frame number included in the received basic frame 101, each sensor D (transmission slots 121, 123). , 125) is completed. Based on the information regarding the timing of each area of the sensor return slot 129 stored in the storage element 1a of each sensor D in advance, the sensor D is assigned to itself among the areas of the sensor return slot 129. A radio signal is transmitted to the area (time zone) corresponding to the device number. For example, the sensor D having the device number 5 transmits a radio signal to the fifth area of the sensor return slot 129. In this way, by setting the reception time zone (the transmission time zone of the sensor D) by the sensor D, it is possible to suppress the destruction of the telegram due to the simultaneous transmission of signals by the plurality of sensors D. can do. Further, since radio signals from a plurality of detectors D can be received in one transmission slot, the time required for reception can be shortened.

Next, an operation example of the sensor D having different intermittent reception timing will be described with reference to FIG. First, the sensor D having the device number 01 receives the 45th basic frame 101 of the transmission slot 123 by intermittent reception, and sends a shortened frame 102 as a response to the basic frame 101 of the sensor return slot 129 of the continuous reception slot 124. Transmit to the first area. The sensor D with the device number 02 receives the 48th basic frame 101 of the transmission slot 121 by intermittent reception, and sends a shortened frame 102 as a response to this to the sensor return slot 129 of the continuous reception slot 122. Transmit to the second area. The sensor D number 03 receives the 55th basic frame 101 of the transmission slot 125 by intermittent reception, and sends the shortened frame 102 as a response thereto to the sensor return slot 129 3 of the continuous reception slot 126. Send to the second area.
In this way, each sensor D transmits a shortened frame in a continuous reception slot (any of the continuous reception slots 122, 124, 126) following the transmission slot (any of the transmission slots 121, 123, 125) that received the signal. 102 is transmitted.

FIG. 7 is a diagram illustrating a communication message transmitted by the repeater repeater in the state collection process according to the embodiment. More specifically, the communication message shown in FIG. 7 is transmitted by the repeater repeater C to the wireless repeater B or the repeater repeater C in the state collection process.
The communication slot 130 shown in FIG. 7 includes a transmission slot 131 that transmits a signal from the repeater repeater C to another repeater repeater C or the wireless repeater B, and a continuous reception slot that receives signals from other devices. 132.

The transmission slot 131 includes a plurality of continuous transmission frames 103 (10 in the present embodiment). That is, in the transmission slot 131, the continuous transmission frame 103 is continuously transmitted a plurality of times.
The transmission slot 131 is used to transmit a radio signal to the wireless repeater B or the repeater repeater C. Accordingly, the length of the transmission slot 131 is set to be longer than the length of the intermittent reception interval TB of the wireless repeater B and the intermittent reception interval TC of the repeater repeater C. The device C can receive any frame in the transmission slot 131.
Before starting transmission using the transmission slot 131, CS before transmission (carrier sense before transmission) is performed, and transmission is started after confirming that other devices are not transmitting radio signals.

  The continuous transmission frame 103 includes sensor information 201 and repeater repeater information 202. The sensor information 201 is composed of data areas corresponding to the number of sensors D (30 in this embodiment) that can communicate with one wireless repeater B. The repeater repeater information 202 includes data areas corresponding to the number of repeater repeaters C that can communicate with one wireless repeater B (6 in the present embodiment).

  The continuous reception slot 132 is a time zone in which a radio signal is not transmitted and reception of a signal from another device is waited for. A fire transfer signal area 133, a fire notification signal area 134, and other signal areas 135 Is provided. The continuous reception slot 132, the fire transfer signal area 133, the fire notification signal area 134, and the other signal area 135 are respectively the continuous reception slot 112, the fire transfer signal area 113, and the fire notification signal shown in FIG. The configuration is the same as the area 114 and the other signal area 115.

(Details of send / receive processing)
Next, (1) status collection processing and (2) fire notification processing will be further described including communication telegrams used in these processing.

(1) Status Collection Processing FIG. 8 is a diagram for explaining status collection processing according to the embodiment. In FIG. 8, among the communication paths for performing wireless communication with the wireless relay B1 shown in FIG. 1, the communication path F1 (the communication paths of the sensors D11 and D12) and the communication path F3 (the repeater relays C2 and C3). The communication path of the sensors D31 and D) will be described as an example.

First, it is assumed that the wireless repeater B1 has received a status request signal from the fire receiver A.
(S301) The wireless repeater B1 transmits a status request signal to the lower device address stored in the storage element among the devices belonging to the communication path F1. In this example, since the subordinate devices in the communication path F1 of the wireless repeater B1 are the sensors D11 and D12, the wireless repeater B1 sends a status request signal to the block communication 120 (FIG. 6A). Send.
On the other hand, the detectors D11 and D12 perform intermittent reception at the intermittent reception interval TD, and receive the state request signal transmitted by the wireless repeater B1 in any of the transmission slots 121, 123, and 125 of the block communication 120. . In this example, it is assumed that the sensor D12 receives the status request signal transmitted in the transmission slot 123, and the sensor D11 receives the status request signal transmitted in the transmission slot 125.

(S302) Upon receiving the state request signal, the sensor D12 transmits a state information signal including its own state information by the shortened frame 102. More specifically, the state information signal is transmitted in the area corresponding to the number of the sensor return slot 129 of the continuous reception slot 124 of the wireless repeater B1 (FIG. 6).
(S303) Upon receiving the state request signal, the sensor D11 transmits a state information signal including its own state information by the shortened frame 102. More specifically, the state information signal is transmitted in the area corresponding to the number of the sensor return slot 129 of the continuous reception slot 126 of the wireless repeater B1 (FIG. 6).

The state collection process of the communication path F1 is completed by steps S301 to S303, and the wireless relay device B1 has collected the state information of the sensor D11 and the sensor D12.
In the example of FIG. 1, the state collection process of the communication path F2 is performed after the state collection process of the communication path F1 is completed. However, the processing content in the communication path F2 is included in the processing content of the communication path F3. The description is omitted here, and the state collection processing of the communication path F3 will be described below.

(S304) The wireless repeater B1 transmits a status request signal to the lower device address stored in the storage element among the devices belonging to the communication path F3. In this example, since the lower-order device in the communication path F3 of the wireless repeater B1 is the repeater repeater C2, the wireless repeater B1 sends a status request signal to the transmission slot 111 (FIG. 5) of the communication slot 110. Send. After transmitting the status request signal through the transmission slot 111, the wireless repeater B1 activates the reception function and shifts to the reception standby state of the continuous reception slot 112.
On the other hand, the repeater repeater C2 performs intermittent reception at the intermittent reception interval TC, and receives the state request signal transmitted by the wireless repeater B1 in the transmission slot 111.

  (S305) When the repeater repeater C2 receives the state request signal transmitted by the wireless repeater B1, the repeater repeater C2 relays and transmits the state request signal to the lower device address stored in its own storage element. In this example, since the lower-order device of the repeater repeater C2 is the repeater repeater C3, the repeater repeater C2 transmits the status request signal in the transmission slot 111 (FIG. 5) of the communication slot 110.

Here, at the timing when the repeater repeater C2 transmits the state request signal, the wireless repeater B1 is in the reception standby state of the continuous reception slot 112 (S304). The wireless repeater B1 receives the state request signal transmitted from the repeater repeater C2 to the repeater repeater C3 in the continuous reception slot 112 (see the broken line in S304), and the state request signal is normally transmitted to the other party. Recognize that it has been received. Although not shown, when the status request signal transmitted by the repeater repeater C2 cannot be received in the continuous reception slot 112 in step S304, the wireless repeater B1 has an error such as a communication error. And the status request signal is retransmitted.
On the other hand, the repeater repeater C3 performs intermittent reception at the intermittent reception interval TC, and receives the state request signal transmitted by the repeater repeater C2 in step S305.

  (S306) When the repeater repeater C3 receives the state request signal transmitted by the repeater repeater C2, the repeater repeater C3 transmits a state request signal to the lower device address stored in its own storage element. In this example, since the subordinate devices of the repeater repeater C3 are the sensors D31 and D32, the repeater repeater C3 sends the status request signal to the transmission slots 121, 123, and 125 of the block communication 120 (FIG. 6A). Send in.

Here, at the timing when the repeater repeater C3 transmits the state request signal, the repeater repeater C2 is in the reception standby state of the continuous reception slot 112 (S305). The repeater repeater C2 receives the status request signal transmitted by the repeater repeater C3 in the continuous reception slot 112 (see the broken line in S305), and thereby recognizes that the status request signal has been normally received by the other party. . Although not shown, if the status request signal transmitted by the repeater repeater C3 cannot be received in the continuous reception slot 112 in step S305, the repeater repeater C2 is assumed to have some abnormality such as a communication abnormality. Determine and retransmit the status request signal.
On the other hand, the sensors D31 and D32 perform intermittent reception at the intermittent reception interval TD, and receive the state request signal transmitted by the repeater repeater C3 in any of the transmission slots 121, 123, and 125. In this example, it is assumed that the sensor D32 receives the status request signal transmitted in the transmission slot 123, and the sensor D31 receives the status request signal transmitted in the transmission slot 125.

(S307) Upon receiving the state request signal, the sensor D32 transmits a state information signal including its own state information through the shortened frame 102. More specifically, the state information signal is transmitted in the area corresponding to the number of the sensor return slot 129 of the continuous reception slot 124 of the wireless repeater B1 (FIG. 6).
(S308) Upon receiving the state request signal, the sensor D31 transmits a state information signal including its own state information by the shortened frame 102. More specifically, the state information signal is transmitted in the area corresponding to the number of the sensor return slot 129 of the continuous reception slot 126 of the wireless repeater B1 (FIG. 6).

  Through these steps S306, 307, and 308, the repeater repeater C3 has collected the state information of its own lower devices (sensors D31 and D32).

(S309) The repeater repeater C3 transmits a status information signal to the upper device address stored in its own storage element. In this example, since the upper device of the repeater repeater C3 is the repeater repeater C2, the repeater repeater C3 transmits the status information signal through the transmission slot 131 (FIG. 7) of the communication slot 130. The continuous transmission frame 103 transmitted at this time includes the state information included in the state information signal from the sensors D31 and D32 received in step S306 in the sensor information 201, and also repeats the state information of the repeater relay C3 itself. It is included in the vessel information 202. That is, the state information signal transmitted from the repeater repeater C3 includes the state information of the sensors D31 and D32 and the repeater repeater C3, which are lower devices of the repeater repeater C3.
On the other hand, the repeater repeater C2 performs intermittent reception at the intermittent reception interval TC, and receives the status information signal transmitted by the repeater repeater C3 in step S309.

  (S310) When the repeater repeater C2 receives the state information signal transmitted by the repeater repeater C3, the repeater repeater C2 transmits a state information signal to the higher-level device address stored in its own storage element. In this example, since the host device of the repeater repeater C2 is the wireless repeater B1, the repeater repeater C2 transmits the status information signal through the transmission slot 131 (FIG. 7) of the communication slot 130. The sensor information 201 of the continuous transmission frame 103 transmitted at this time includes state information of the sensors D31 and D32, and the repeater repeater information 202 includes state information of the repeater repeaters C3 and C2. That is, the repeater repeater C2 transmits a signal obtained by adding its own state information to the state information signal received from the lower device as a state information signal.

Here, at the timing when the repeater repeater C2 transmits the state information signal, the repeater repeater C3 is in the reception standby state of the continuous reception slot 132 (S309). The repeater repeater C3 receives the status information signal transmitted to the wireless repeater B1 by the repeater repeater C2 in the continuous reception slot 132 (see the broken line in S309), and the status information signal is normally transmitted to the other party. Recognize that it has been received. Although not shown, if the status information signal transmitted by the repeater repeater C2 cannot be received in the continuous reception slot 132 in step S309, the repeater repeater C3 is assumed to have some abnormality such as a communication abnormality. Determine and retransmit the status information signal.
On the other hand, the wireless repeater B1 performs intermittent reception at the intermittent reception interval TB, and receives the state request signal transmitted by the repeater repeater C2 in step S310.

(S311) Upon receiving the status information signal transmitted by the repeater repeater C2, the wireless repeater B1 transmits a reception response signal, which is a signal indicating that the signal has been received, to the transmission source device.
The repeater repeater C2 receives the reception response signal transmitted by the wireless repeater B1 in the continuous reception slot 132 in step S310, and thereby recognizes that the status information signal has been normally received by the other party. Although not shown, when the reception response signal transmitted from the wireless repeater B1 cannot be received in the continuous reception slot 132 in step S310, the repeater repeater C2 has some abnormality such as a communication abnormality. And the state information signal is retransmitted.

  Although not shown, when the state collection processing of all communication paths of its own group is completed, the wireless repeater B1 determines the state of the signal including the collected state information, and if necessary, the state information. The information contained in the signal is transmitted to the fire receiver A. In step S311, the wireless repeater B1 transmits a reception response signal to the repeater repeater C2. However, wireless communication is performed between the wireless repeater B1 and the fire receiver A. If it is a structure, you may replace the signal containing the status information transmitted with respect to the fire receiver A from the radio | wireless repeater B1 with the reception response signal with respect to the repeater repeater C2.

  As described above, in the fire alarm system 100 according to the present embodiment, as shown in steps S305, S306, and S310 in FIG. 8, the status information signal transmitted from the repeater repeater C to the relay destination device is relayed. It also serves as a response signal indicating that it has been received by the original device. For this reason, compared with the case where the response signal which shows having received the signal normally is separately transmitted with respect to a relay origin apparatus, the frequency | count of signal transmission can be reduced, current consumption can be reduced, and communication traffic can be suppressed.

Note that the block communication 120 does not necessarily execute all the slots (transmission slot 121, continuous reception slot 122, transmission slot 123, continuous reception slot 124, transmission slot 125, and continuous reception slot 126). When the status information signals from all the detectors D belonging to are received, the transmission of the signals can be stopped. For example, when the status information signals from all the sensors D are received in the continuous reception slot 122, the repeater repeater C or the wireless repeater B that is the transmission source of the block communication 120 Do not process. In this way, it is not necessary to perform useless communication processing, current consumption can be reduced, and delay in information transmission can be prevented.
If the status information signal cannot be received from the sensor D in any of the continuous reception slots 122, 124, and 126, the repeater repeater C or the wireless repeater B uses the sensor assigned to the sensor D. A signal indicating “no response” is entered in the area of the return slot 129, and this is transmitted as a status information signal to the host device.

(2) Fire Notification Processing FIG. 9 is a diagram for explaining fire notification processing. 9A shows a communication path F1 (communication path of the sensors D11 and D12) among the communication paths for performing wireless communication with the wireless repeater B1 shown in FIG. 1, and FIG. , Communication path F3 (communication path of repeater repeaters C2, C3 and sensors D31, 32). Hereinafter, the fire notification process will be described with reference to FIG. 9 and the above-described FIGS. The processing content of the communication path F2 in FIG. 1 is omitted here because the same processing is included in the communication path F3 and the processing content.

FIG. 9A shows an example where a fire has occurred in the monitoring area of the sensor D12.
(S401) Upon detecting the occurrence of a fire, the sensor D12 transmits a fire signal including fire detection information to the upper device address stored in the storage element by the transmission slot 111 (FIG. 5) of the communication slot 110. In this example, since the host device of the sensor D12 is the wireless relay B1, the sensor D12 transmits a fire signal to the wireless relay B1. After transmitting the fire signal through the transmission slot 111, the sensor D12 activates the reception function and shifts to the reception standby state of the continuous reception slot 112.
On the other hand, the wireless repeater B1 performs intermittent reception at the intermittent reception interval TB, and receives the fire signal transmitted by the sensor D12 in step S401.

(S402) Upon receiving the fire signal from the sensor D12, the wireless repeater B1 transmits a reception response signal, which is a signal indicating that the signal has been received, to the sensor D12 that is a transmission source device. .
The sensor D12 receives the reception response signal transmitted by the wireless repeater B1 in the continuous reception slot 112 in step S401, and thereby recognizes that the fire signal has been normally received by the other party. Although not shown, if the reception response signal transmitted by the wireless repeater B1 cannot be received in the continuous reception slot 112 in step S401, the sensor D12 has assumed that some abnormality such as a communication abnormality has occurred. Determine and resend the fire signal.

FIG. 9B shows an example where a fire has occurred in the monitoring area of the sensor D31.
(S501) Upon detecting the occurrence of a fire, the sensor D31 transmits a fire signal to the upper device address stored in the storage element through the transmission slot 111 (FIG. 5) of the communication slot 110. In this example, since the host device of the sensor D31 is the repeater repeater C3, the sensor D31 transmits a fire signal to the repeater repeater C3. After transmitting the fire signal through the transmission slot 111, the sensor D31 activates the reception function and shifts to the reception standby state of the continuous reception slot 112.
On the other hand, the repeater repeater C3 performs intermittent reception at the intermittent reception interval TC, and receives the fire signal transmitted by the sensor D31 in step S501.

(S502) When the repeater repeater C3 receives the fire signal from the sensor D31, the repeater repeater C3 transmits a fire transfer signal to the upper device address (here, the address of the repeater repeater C2) stored in the storage element. After transmitting the fire transfer signal, the repeater repeater C3 activates the reception function and shifts to the reception standby state of the continuous reception slot 112.
The fire transfer signal transmitted by the repeater repeater C3 is received by the sensor D31 in the continuous reception slot 112 (see the broken line in S501), and the sensor D31 receives the fire transfer signal and receives the fire signal transmitted by itself. Is normally received by the repeater repeater C3.
On the other hand, the repeater repeater C2 that performs intermittent reception at the intermittent reception interval TC also receives the fire transfer signal transmitted by the repeater repeater C3.

(S503) When the repeater repeater C2 receives the fire transfer signal from the repeater repeater C3, the transmission slot 111 (FIG. 5) sends the fire transfer signal to the upper device address (in this case, the wireless device address) stored in the storage element. To the address of the repeater B1. After transmitting the fire transfer signal, the repeater repeater C2 activates the reception function and shifts to the reception standby state of the continuous reception slot 112.
The fire transfer signal transmitted by the repeater repeater C2 is received by the repeater repeater C3 at the continuous reception slot 112 (see the broken line in S502), and the repeater repeater C3 transmits the fire transfer signal by receiving the fire transfer signal. It recognizes that the fire signal has been normally received by the repeater repeater C2.
On the other hand, the wireless repeater B1 that performs intermittent reception at the intermittent reception interval TB also receives the fire transfer signal transmitted by the repeater repeater C2.

(S504) Upon receiving the fire transfer signal from the repeater repeater C2, the wireless repeater B1 transmits a reception response signal to the repeater repeater C2 that is the transmission source of the fire transfer signal.
The repeater repeater C2 receives the reception response signal from the wireless repeater B1 in the continuous reception slot 112, and thereby recognizes that the fire transfer signal transmitted by itself is normally received by the wireless repeater B1. can do.

  Note that, even in the configuration in which the repeater repeater C is interposed between the wireless repeater B and the sensor D as in the example of FIG. In some cases, the wireless repeater B can directly receive the fire signal transmitted from the device D. In such a case, the wireless repeater B recognizes that a fire has occurred due to the fire signal transmitted from the sensor D even if the fire transfer signal from the repeater repeater C has not arrived, and fires the fire signal. Transmit to receiver A. For this reason, a fire signal can be transmitted from the sensor D to the fire receiver A at an early stage.

  8 and 9, each of the state collection process and the fire notification process has been described. For example, the sensor D may detect a fire during the state collection process. Thus, when both communication processes occur simultaneously, the fire notification facility 100 prioritizes the fire notification process. More specifically, when the repeater repeater C receives a fire signal from the sensor D while receiving or transmitting the state request signal, the repeater repeater C stops the transmission / reception process of the state request signal, Start the transmission process of the fire transfer signal. Thus, by giving priority to the transmission of the fire transfer signal, it is possible to suppress the delay in the transfer of the fire signal.

Here, an example of operation when the detector D detects a fire during the state collection processing will be further described. FIG. 10 is a diagram for explaining an operation example when the sensor detects a fire during the state collection processing according to the embodiment.
FIG. 10 shows a situation in which the detector D32 detects a fire while the repeater repeater C is transmitting the status information signal in step S309 shown in FIG.
As shown in step S510, the sensor D32 that has detected a fire performs carrier detection before transmission before transmitting a fire signal. In this pre-transmission carrier sense, it is assumed that the sensor D32 receives the radio signal transmitted by the repeater repeater C3 in step S309. Here, since what is transmitted in step S309 is the continuous transmission frame 103, the sensor D32 cannot transmit a fire signal in order to receive the continuous transmission frame 103 by the carrier sense before transmission. Then, the sensor D32 waits until the transmission slot 131 is completed based on the frame number of the continuous transmission frame 103 received by the carrier sense before transmission. At the timing of the fire notification signal area 134 of the continuous reception slot 132, the sensor D32 transmits a fire signal to the fire notification signal area 134 of the continuous reception slot 132. In this way, the sensor D transmits a signal to the corresponding area of the receiving device depending on the type of signal to be transmitted. In this way, by determining the reception time zone (transmission time zone in the transmission side device) according to the type of signal, it is possible to suppress the destruction of the message by simultaneously transmitting multiple types of signals. Can do. Further, since the reception area (time zone) in the receiving device is divided according to the type of signal to be transmitted, priority can be given to transmission of a fire signal with high importance, and the fire signal can be transmitted early.

  As described above, in the state collection processing according to the present embodiment, the wireless repeater B and the repeater repeater C transmit the state request signal to the counterpart repeater repeater C through the transmission slot 111, and then receive them. The function is activated and continuous reception is performed by the continuous reception slot 112. Then, the wireless repeater B and the repeater repeater C are transmitted in the continuous reception slot 112 by the repeater repeater C as a relay partner to the relay destination device (the repeater repeater C or the sensor D). It is determined whether or not the status request signal is normally relayed to the repeater repeater C of the other party depending on whether or not the request signal can be received. That is, the state request signal transmitted from the other repeater repeater C to the relay destination device (repeater repeater C or sensor D) is a signal to the repeater wireless repeater B or repeater repeater C. Also serves as a response signal for reception. As described above, the repeater repeater C does not transmit a response signal when it receives a state request signal, so that the current consumption required for signal transmission processing is reduced as compared with the conventional case of transmitting a response signal. be able to. Moreover, since the number of signals transmitted and received in the state collection process can be reduced in the fire alarm facility 100 of the present embodiment as compared with the conventional one that transmits a response signal, communication traffic can be suppressed. Further, in this embodiment, since the time required for transmission / reception processing of the repeater repeater C and the sensor D in the state collection processing can be shortened as compared with the conventional case of transmitting a response signal, Early transmission of fire signals when a fire is detected can be realized.

  In the above embodiment, when the wireless repeater B receives the state request signal from the fire receiver A, the state information signal of the sensor D and the like of each path is transmitted to the fire receiver A. Without being limited thereto, the wireless repeater B may collect the state and determine the state of the sensor D of each path at its own timing. In this case, a status information signal may be transmitted to the fire receiver A only when a fire or abnormality occurs.

  1 control circuit, 1a memory element, 2 battery, 3 voltage regulator circuit, 4 voltage detection circuit, 5 transmission / reception circuit, 5a transmission circuit, 5b reception circuit, 6 antenna, 7 fire detection circuit, 8 indicator lamp circuit, 9 registration switch, DESCRIPTION OF SYMBOLS 11 Control circuit, 11a Memory element, 20a Power line terminal, 20b Signal line terminal, 21 Control circuit, 21a Memory element, 22 Receiver I / F circuit, 100 Fire alarm equipment, 101 Basic frame, 102 Short frame, 103 Continuous transmission frame, 110 communication slot, 111 transmission slot, 112 continuous reception slot, 113 fire transfer signal area, 114 fire notification signal area, 115 other signal area, 120 block communication, 121 transmission slot, 122 continuous reception slot, 123 transmission slots, 124 continuous reception slots, 25 Transmission slot, 126 Continuous reception slot, 129 Sensor return slot, 130 Communication slot, 131 Transmission slot, 132 Continuous reception slot, 133 Fire transfer signal area, 134 Fire notification signal area, 135 Other signal area, 201 Sensing Equipment information, 202 repeater repeater information, A fire receiver, B wireless repeater, C repeater repeater, D sensor, F1 communication path, F2 communication path, F3 communication path, F4 communication path.

Claims (2)

A sensor that detects environmental changes based on fire phenomena and transmits and receives wireless signals;
A fire receiver for monitoring and controlling the sensor;
One or a plurality of repeaters that are interposed between the sensor and the fire receiver and constitute a plurality of communication layers and relay radio signals,
Based on the status request signal transmitted from the upper device in the communication layer, the lower device in the communication layer is a fire alarm facility that performs a state collection process of transmitting a state information signal including its own device state information,
In the state collection process, the one or more relays and the sensor are:
When the destination device of the status request signal or the status information signal is the repeater, after transmitting the status request signal or the status information signal to the destination relay, the destination relay In order to receive the said status request signal or the said status information signal transmitted with respect to the relay destination, it activates a receiving function for a predetermined time and performs a receiving process. In the reception process, the one or more repeaters and the sensor are
The state request signal or the status response signal is transmitted again when the status repeater signal or the status response signal transmitted to the relay destination cannot be received by the destination repeater. Item 1. Fire alarm equipment according to item 1.

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