JP2008009566A - Fire alarm system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-use fire alarm system in which a larger number of relays than the number of frequency channels can be used. <P>SOLUTION: The system has a plurality of relays 2 for relaying fire sensing data obtained by receiving wireless signals transmitted from a plurality of fire sensors 1 that sense fire, to a monitoring panel 3 connected through a transmission line Ls. The time division multiplex time slots used by the fire sensors 1 for sending wireless signals to the relays 2 are allotted so that they do not overlap each other for the plurality of the relays 2 using the same frequency channel. Thereby, a larger number of the relays 2 than the number of the frequency channels can be used. In comparison with the case where the time slots used overlap each other, there are fewer restrictions concerning the positions of the fire sensors 1, thereby improving usability. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fire alarm system.

  Conventionally, as shown in FIG. 1, a plurality of fire detectors 1 for detecting a fire, a repeater 2 for transmitting and receiving radio signals between at least one fire detector 1, and each repeater 2 And a monitoring panel 3 connected to each other via a transmission line is provided (see, for example, Patent Document 1). That is, when the fire detector 1 detects a fire, it transmits fire detection data indicating that the fire has been detected as a wireless signal. The repeater 2 receives this wireless signal, and transmits the obtained fire detection data to the monitoring panel 3 via the transmission path. When the fire detection data is received from the repeater, the monitoring panel performs a fire alarm process such as driving an alarm or notifying the management center via a telephone line.

For wireless communication between the fire detector 1 and the repeater 2, the wireless signal is transmitted in a different time slot for each fire detector 1 to avoid a radio signal collision between the fire detectors 1 A multiplex transmission scheme is used. Further, in the wireless communication, by using a different frequency channel for each repeater 2, collision of wireless signals between fire detectors 1 communicating with different repeaters 2 is avoided.
JP-A-5-210790

  When using a wireless fire alarm in Europe, there is a provision for frequency allocation of 860 megahertz short-range radio (SRD) of ERC REC 70-03, among which the dedicated alarm frequency It is necessary to follow the rules for belts. Here, as a frequency of the radio signal, a specific frequency band (alarm dedicated frequency) that avoids a frequency in which noise is likely to be mixed is used, so that the number of usable frequency channels is limited. Specifically, the specific frequency band is, for example, three frequency bands of 868.6 to 868.7 MHz, 869.25 to 869.3 MHz, and 869.65 to 869.7 MHz, and 25 kHz per frequency channel. If the width is secured, a total of eight frequency channels can be used in the frequency band.

  When it is desired to use more repeaters 2 than the number of frequency channels, a method of providing a frequency channel using a frequency band in which noise is likely to be mixed, and two or more repeaters 2 for one frequency channel. There is a method of using in.

  However, the former method naturally tends to cause malfunction due to noise. Further, in the latter method, the fire detector 1 is arranged so that the communicable ranges do not overlap between the repeaters 2 using the common frequency channel, or the fire detector 1 is not arranged in the overlapping range of the communicable ranges. Since the position of 1 and repeater 2 had to be taken into account, it was not easy to use.

  The present invention has been made in view of the above reasons, and it is an object of the present invention to provide a fire alarm system that can use more repeaters than the number of frequency channels and is easy to use.

  The invention of claim 1 is obtained by receiving a plurality of fire detectors for detecting fire and transmitting fire detection data by radio signals using radio waves as a medium, and radio signals transmitted from the fire detectors. A plurality of repeaters that relay fire detection data, and a monitoring panel that is connected to each repeater via a transmission path and performs predetermined fire alarm processing when fire detection data is transmitted from any of the repeaters The fire detector has a sensing means for detecting a fire by detecting at least one of smoke and heat generated by the fire, a wireless communication means for transmitting a radio signal, and a fire by the sensing means. Control means for controlling the wireless communication means to transmit the fire detection data by a wireless signal when a fire is detected, and the repeater is a wireless communication means for receiving the wireless signal transmitted by the wireless communication means of the fire detector And transmission A transmission means for transmitting data to and from the monitoring board via the wireless communication means, and a control means for controlling the wireless communication means and the transmission means, respectively. Transmission means for transmitting and receiving, notification means for informing of the occurrence of a fire, and fire detection data that is data relayed from a repeater via a transmission path and transmission means, the notification means is controlled to control the occurrence of a fire. Control means for performing notification, and the wireless communication means of the fire detector and the wireless communication means of the repeater perform wireless communication with each other among a plurality of frequency channels when transmitting and receiving a wireless signal of fire detection data. Among a plurality of time slots constituting a time division multiplexing frame in a frequency channel preset in each of the repeater and the fire detector so that they coincide with each other in the repeater and the fire detector A fire alarm system that uses a preset time slot for each disaster detector, and the time that the fire detector uses to transmit a radio signal to the repeater for a plurality of repeaters that use the same frequency channel. The slots are assigned so as not to overlap each other.

  According to the present invention, the time slots used by the fire detector to transmit radio signals to the repeater are assigned to a plurality of repeaters that use the same frequency channel so that they do not overlap each other. More repeaters than the number of channels can be used. In addition, since there is no signal collision between fire detectors using the same frequency channel, it is easier to use because there are fewer restrictions on the positions of fire detectors and repeaters than when time slots overlap.

  The invention of claim 2 is the invention of claim 1, wherein the time slots used for transmitting the radio signal from the fire detector to the repeater are divided into a plurality of groups for each frequency channel used, The repeater has setting means for setting which group of time slots to use, and the control means of the repeater sets the time slot used for transmission of wireless communication to the repeater to the fire detector. When specifying, only the time slots within the group set in the setting means are specified.

  According to the present invention, when different groups are designated, time slots do not overlap. Therefore, it is easy to prevent time slots used by fire detectors using a common frequency channel from overlapping each other.

  According to a third aspect of the present invention, in the first aspect of the invention, the control means of the repeater controls the transmission means when a new fire sensor is associated, and information on the frequency channel used by itself. The time slot search data for requesting notification of the usage status of the time slot is transmitted to another repeater via the transmission line, and the other repeater receives the time slot search data via the transmission line and the transmission means The control means controls the transmission means when the frequency channel used by itself coincides with the frequency channel included in the time slot search data, and transmits the time slot notification data indicating the time slot used by itself. The control means of the repeater that transmitted the time slot search data to the repeater that transmitted the time slot search data via the The time slot is determined unused on the basis of the time slot notification data and its own time slot in use, characterized in that assigned to the fire detector.

  According to the present invention, since it is not necessary to manage the usage status of the time slot, the burden on the operator when adding a repeater or a fire detector or constructing a system is reduced.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the monitoring panel includes a storage unit that stores information indicating which time slot is already used in each frequency channel. When a new fire detector is associated, the transmission means is controlled, and time slot request data including information on the frequency channel used by itself and requesting allocation of an unused time slot is transmitted via the transmission line. When the time slot request data is received by the transmission means, there is an unused time slot in the frequency channel used by the repeater that transmitted the time slot request data. In this case, the time slot request data indicating one unused time slot is transmitted via the transmission means and the transmission path. When the time slot instruction data is received by the transmission means, the control means of the repeater that has transmitted to the repeater and transmitted the time slot request data assigns the time slot indicated in the time slot instruction data to the fire detector. It is characterized by that.

  According to the present invention, since it is not necessary to know whether or not the time slot is used, the burden on the operator is reduced when adding a repeater or a fire detector or constructing a system. Further, as compared with the invention of claim 3, the load on the control means of the repeater and the traffic on the transmission path are reduced.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, in each repeater that uses a common frequency channel, the wireless communication means uses the same frequency channel for transmitting a wireless signal. It is characterized by using a time slot different from both the repeater and the fire detector.

  According to the present invention, since there is no radio signal collision between repeaters, a plurality of repeaters in which fire detectors are arranged in areas where the same frequency channels are used and the communicable ranges of each other overlap. An operation of transmitting a radio signal within the same frame is possible.

  According to a sixth aspect of the present invention, in the fifth aspect of the invention, each of the monitoring panel, each repeater, and each fire sensor is provided with time measuring means for measuring the time, and each repeater and each fire sensor is a radio signal. In the monitoring panel, the control means periodically controls the transmission means for each repeater and determines the start timing of the time slot for transmitting and receiving the time slot. In each repeater, when the time data is received by the transmission means, the time correction means corrects the time of its own time measurement means based on the time data, When the wireless communication means is controlled to transmit the time data as a wireless signal, and in each fire detector, the control means obtains the time data from the wireless signal received by the wireless communication means. Characterized by modifying the time of its time counting means based on the time data.

  According to the present invention, it is possible to correct an error caused by a change over time of the time measuring means of the repeater or the fire detector.

  According to the present invention, the time slots used by the fire detector for transmitting the radio signal to the repeater are assigned to a plurality of repeaters that use the same frequency channel so as not to overlap each other. More repeaters than the number of channels can be used. In addition, since there is no signal collision between fire detectors using the same frequency channel, it is easier to use because there are fewer restrictions on the positions of fire detectors and repeaters than when time slots overlap.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
In the present embodiment, as in the conventional example shown in FIG. 1, a plurality of fire detectors 1, a plurality of repeaters 2 that perform wireless communication with at least one fire detector 1, respectively, The monitoring panel 3 is connected to each repeater 2 via a transmission line Ls. As the transmission line Ls, for example, a 10BASE-T cable can be used. For wireless communication between the fire detector 1 and the repeater 2, a frequency channel set in advance for each fire detector 1 or each repeater 2 among a plurality of frequency channels is used, and different frequency channels are used. This avoids radio signal collisions and malfunctions.

  The fire detector 1 is installed, for example, on an indoor ceiling (not shown). As shown in FIG. 2, the fire detector 1 detects a fire by detecting at least one of smoke and heat generated by a fire. A wireless communication unit 12 that has an antenna 12a to transmit and receive wireless signals, and that the fire is detected by controlling the wireless communication unit 12 when a fire is detected by the detection unit 11. And a control unit 13 that transmits fire detection data indicating a wireless signal as a wireless signal. The sensing unit 11 that senses fire by sensing heat, for example, has a pyroelectric sensor and outputs an output indicating that a fire has been sensed when the output of the pyroelectric sensor exceeds a predetermined threshold. What is input to 13 is conceivable. The sensing unit 11 that senses a fire by sensing smoke, for example, emits light such as a light emitting diode in a sensing chamber (not shown) formed in a structure in which outside light is blocked and outside air enters and exits. An element (not shown) and a light receiving element (not shown) such as a photodiode are scattered by the light when the light from the light emitting element does not directly enter the light receiving element and smoke is present in the sensing chamber. It is arranged that the light from the light emitting element is incident on the light receiving element (for example, crossing the optical axes of each other), indicating that a fire has been detected when the output of the light receiving element exceeds a predetermined threshold One that inputs the output to the control unit 13 can be considered. The sensing unit 11 has the above-described configuration, and outputs at least one of heat and smoke indicating that a fire has been sensed when the above-described conditions for determining that a fire has occurred are satisfied. It may be input to the control unit 13. Since the various sensing units 11 can be realized by a known technique, illustration and detailed description thereof are omitted. In addition, the fire detector 1 includes an operation unit 14 that receives an operation input, and a frequency channel used for wireless communication with the repeater 2 can be specified by the operation input to the operation unit 14. Further, the operation unit 14 can set a unique ID for each fire detector 1. Each data transmitted as a radio signal from the radio communication unit 12 includes an ID set in the operation unit 14 in the fire detector 1 of the transmission source.

  As shown in FIG. 3, the repeater 2 has an antenna 21 a and performs radio signal communication with the wireless communication unit 12 of the fire detector 1 and monitors via the transmission line Ls. A transmission unit 22 connected to the panel 3 and a control unit 23 for controlling the wireless communication unit 21 and the transmission unit 22 are provided. When the fire detection data is obtained from the wireless signal received by the wireless communication unit 21, the control unit 23 controls the transmission unit 22 to transmit the fire detection data to the monitoring panel 3. In addition, the repeater 2 includes an operation unit 24 that accepts an operation input, and a frequency channel used for wireless communication with the fire detector 1 can be specified by the operation input to the operation unit 24. Further, in the operation unit 24, a unique ID can be set for each repeater 2. Each data transmitted from the transmission unit 22 of the repeater 2 includes a transmission source ID so that the data transmitted from any of the repeaters 2 can be recognized by the data reception destination. It is also possible to designate a specific repeater 2 as the data transmission destination by ID, and when the transmission destination ID is specified in the data received by the transmission unit 22, it matches the ID. The control unit 23 does not accept the received data except for the repeater 2 in which the ID is set.

  As shown in FIG. 4, the monitoring panel 3 includes a transmission unit 31 connected to the transmission unit 22 of the repeater 2 through the transmission line Ls, a notification unit 32 that notifies of the occurrence of a fire, and a fire detection in the transmission unit 31. And a control unit 33 that controls the notification unit 32 to notify the occurrence of a fire when data is received. As the notification unit 32, for example, a buzzer or siren is provided and a fire is notified by sounding it, or a fire is generated in a management center or a user's mobile phone connected to the public network via the public network. The thing etc. which alert | reports are considered. Further, from the fire detector 1 and the relay 2 ID included in the fire detection data, the control unit 33 of the monitoring panel 3 transmits the fire detection data from which fire detector 1, that is, the fire. It is possible to recognize where is detected. For communication between the transmission unit 31 of the monitoring panel 3 and the transmission unit 22 of each repeater 2, a known technique such as polling can be used.

  Here, time division multiplexing is used for wireless communication between the wireless communication units 12 and 21 between the fire detector 1 and the repeater 2. As shown in FIG. 5, the frame to be used is one time slot B in the downstream direction (relay 2 → fire detector 1) and a plurality of (32 in the figure) upstream (fire detector 1 → relay). And 2) time slots D1 to D32. That is, the time slots D1 to D32 are individually assigned to the fire detectors 1 that use a common frequency channel, thereby avoiding signal collisions and malfunctions. There is a one-to-one correspondence between the ID of the fire detector 1 and the time slots D1 to D32, and the time slot that the fire detector 1 uses to transmit a radio signal is determined according to the ID set in the operation unit 14. Has been. Note that any fire detector may be assigned to any time slot as long as each ID of the fire detector and the time slots D1 to D32 have a one-to-one correspondence.

  The repeater 2 can specify whether to accept fire detection data for each ID of the fire detector 1, that is, for each time slot D1 to D32, by an operation input to the operation unit 24. Specifically, for example, the operation unit 24 has 32 dip switches (not shown) corresponding to 32 IDs corresponding one-to-one with the upstream time slots D1 to D32, and is turned on. Only the fire detection data from the fire detector 1 corresponding to is accepted. That is, the fire detection data transmitted from the fire detector 1 by wireless signal is only when the ID specified in the operation unit 14 of the fire detector 1 is included in the ID specified in the operation unit 24 of the repeater 2. , It is accepted by the repeater 2.

  Moreover, the control part 13 of the fire detector 1 will transmit predetermined | prescribed registration request data to the repeater 2 as a radio signal, if the predetermined operation input which instruct | indicates the matching (registration) to the repeater 2 is received. When the registration request data is obtained from the radio signal received by the radio communication unit 21, the control unit 23 of the repeater 2 receives the ID of the fire detector 1 included in the registration request data and the ID specified by the operation unit 24. Compare Then, if the ID of the fire detector 1 included in the registration request data is included in the ID specified in the operation unit 24, the wireless communication unit 21 is controlled and the frame start time which is the time when the next frame starts Is transmitted to the fire detector 1 that has transmitted the wireless signal of the registration request data by a wireless signal. In the fire detector 1 that has transmitted the wireless signal of the registration request data, when the registration data is obtained from the wireless signal received by the wireless communication unit 12, the control unit 23 thereafter uses the frame start time included in the registration data as a reference. The wireless communication unit 21 is controlled as follows.

  By the way, when the repeater 2 is installed in a narrow room such as a toilet or a storage room and the number of fire detectors 1 associated therewith is small, the time slots D1 to D32 are set in the frequency channel used by the repeater 2. There is often a surplus. The present invention pays attention to this point, and increases the number of usable repeaters 2 by effectively using the remaining time slots D1 to D32 as described above while being allocated to individual frequency channels.

  That is, in the above configuration, if the time slots D1 to D32 used for receiving the radio signal from the fire detector 1 are made different for each repeater 2 using the same frequency channel, two timeslots using the same frequency channel are used. A malfunction due to simultaneous reception of the radio signals of one fire detector 1 by the repeater 2 and collision of the radio signals of the fire detector 1 can be avoided. Therefore, when the fire detector 1 can be arranged at a position where two or more repeaters 2 using the same frequency channel can communicate with each other at the same time, and the time slots D1 to D32 to be used are common between the repeaters 2. Compared to, the position of the fire detector 1 and the repeater 2 is less restricted, so it is easy to use.

  In addition, you may add the fire detector (not shown) connected by the wire without using wireless communication with respect to the repeater 2, the monitoring board 3, or the transmission line Ls. Since the fire detector connected in a wired manner as described above can be realized by a known technique, illustration and detailed description thereof are omitted.

  In FIG. 1, the monitoring panel 3 and the repeater 2 are connected in a ring shape. However, for the connection between the monitoring panel 3 and the repeater 2, other well-known topologies such as a bus shape and a star shape are adopted. Also good.

(Embodiment 2)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, and illustration and description are omitted.

  In the present embodiment, the upstream time slots D1 to D32 used for transmission from the fire detector 1 to the repeater 2 are divided into a plurality of groups (for example, 8 time slots each consisting of 4 time slots). Yes. Then, in the operation units 14 and 24 of the fire detector 1 and the repeater 2, the designation of the ID, that is, the designation of the time slots D1 to D32 used for transmitting the radio signal from the fire detector 1 to the repeater 2 is performed. Instead of specifying individual IDs, that is, specifying individual time slots D1 to D32 as in the first embodiment, only a group of time slots D1 to D32 is specified. For example, the operation unit 24 as the setting unit of the repeater 2 has eight dip switches corresponding to the group one-to-one, and the repeater 2 is connected to the dip switch among the time slots D1 to D32 in the upstream direction. The wireless signal of the fire detection data is not accepted in the group corresponding to the turned off one.

  Hereinafter, an operation when upstream time slots D1 to D32 are assigned to the fire detector 1 in the present embodiment will be described. In the fire detector 1, after a frequency channel and the group are specified in the operation unit 14, when a predetermined operation input instructing the association to the repeater 2 is received by the operation unit 14, the control unit 13 The wireless communication unit 12 is controlled to transmit predetermined registration request data including information on the designated group as a wireless signal.

  In the repeater 2, when the registration request data is obtained from the radio signal received by the radio communication unit 21, the control unit 23 determines the group indicated in the registration request data and the group set in its own operation unit 24. If the group indicated in the registration request data is included in the group set in the operation unit 24, the registration request data is accepted. When the registration request data is received, the unused time slots D1 to D32 are searched for in the group indicated in the registration request data. If there are unused time slots D1 to D32, the wireless communication unit 21 is searched. The fire detector 1 having transmitted the registration request data is caused to transmit time slot designating data for designating one of the unused time slots D1 to D32 as a radio signal. Further, the time slot designation data includes the frame start time as in the registration data of the first embodiment.

  In the fire detector 1, when the time slot designation data is obtained from the radio signal received by the radio communication unit 12, the control unit 13 thereafter uses the time slots D1 to D32 designated in the time slot designation data. A radio signal is transmitted to the repeater 2.

  According to the above configuration, it is only necessary to make different groups for a plurality of repeaters 2 using the same frequency channel, and it is necessary to manage which ID, that is, which time slots D1 to D32 are unused. Therefore, compared to the case of individually specifying the IDs to be used, that is, the time slots D1 to D32 as in the first embodiment, the worker at the time of constructing the system or adding the fire detector 1 or the repeater 2 The burden of is reduced.

(Embodiment 3)
Since the basic configuration of the present embodiment is the same as that of the first embodiment, illustration and description of portions common to the first embodiment are omitted.

  In the present embodiment, the time slots D1 to D32 used for transmitting the radio signal to the repeater 2 in the fire detector 1 are not directly specified by the operation input to the operation unit 14, but the repeater 2 is connected to the transmission line Ls. The other repeater 2 is accessed via a search for an unused time slot in the frequency channel, and the found unused time slot is assigned to the fire detector 1.

  Specifically, in the fire detector 1, after a frequency channel is designated in the operation unit 14, when a predetermined operation input instructing the association with the repeater 2 is received by the operation unit 14, the control unit 13. Controls the wireless communication unit 12 to transmit predetermined registration request data as a wireless signal. In the repeater 2, when registration request data is obtained from the radio signal received by the radio communication unit 21, the control unit 23 controls the transmission unit 22 to transmit the frequency channel used by itself (that is, the registration request data). Time slot search data that includes information on the frequency channel used by the fire detector 1 and that requests notification of the time slots D1 to D32 in use in the frequency channel.

  Further, in the repeater 2, when the time slot search data including the information of the frequency channel used by the repeater 2 is received by the transmission unit 22, the control unit 23 controls the transmission unit 22 so that the repeater 2 can determine any time. Time slot notification data indicating whether the slots D1 to D32 are being used is transmitted to the repeater 2 that has transmitted the time slot search data.

  In the repeater 2 that has transmitted the time slot search data, the control unit 23 receives the time slot notification data over a predetermined period sufficient as the time until reception of the time slot notification data, and the time received by the transmission unit 22 during that period. The contents of the slot notification data and the time slots D1 to D32 that are being used are integrated, and if there are unused time slots D1 to D32, the wireless communication unit 21 is controlled to use the unused time slots D1 to D32. Time slot designating data for designating one of them is transmitted as a radio signal. Further, when the time slot notification data is not received over the predetermined period, it means that no other repeater 2 using the same frequency channel exists in the system. With reference to only D32, one of the unused time slots D1 to D32 is designated in the time slot designation data. The time slot designation data includes the frame start time as in the registration data of the first embodiment.

  In the fire detector 1 that has transmitted the registration request data, when the control unit 13 obtains the time slot designation data from the radio signal received by the radio communication unit 12, the time slot designated in the time slot designation data is used thereafter. A radio signal is transmitted to the repeater 2 using D1 to D32.

  According to the above configuration, unlike the first and second embodiments, it is not necessary to manage which time slot (or group) is in use. The burden on the operator when building or adding the fire detector 1 or the repeater 2 is reduced.

(Embodiment 4)
Since the basic configuration of the present embodiment is the same as that of the third embodiment, illustration and description of portions common to the third embodiment are omitted.

  In the third embodiment, the repeater 2 that has received the registration request data searches the unused time slots D1 to D32 by accessing the other repeater 2, but in the present embodiment, each frequency is monitored in the monitoring panel 3. Channel time slots D1 to D32 are collectively managed.

  Specifically, in the fire detector 1, after a frequency channel is designated in the operation unit 14, when a predetermined operation input instructing the association with the repeater 2 is received by the operation unit 14, the control unit 13. Controls the wireless communication unit 12 to transmit predetermined registration request data as a wireless signal. In the repeater 2, when registration request data is obtained from the radio signal received by the radio communication unit 21, the control unit 23 controls the transmission unit 22 to transmit the frequency channel used by itself (that is, the registration request data). Time slot request data for requesting notification of unused time slots D1 to D32 in the frequency channel is transmitted to the monitoring panel 3.

  In the monitoring panel 3, the control unit 33 has a memory for storing which time slot D1 to D32 is in use in each frequency channel, and when the time slot request data is received by the transmission unit 31, A relay unit that searches for unused time slots D1 to D32 in the frequency channel included in the slot request data and controls the transmission unit 31 if there are unused time slots D1 to D32, and transmits the time slot request data. 2 transmits time slot specifying data specifying one of the unused time slots D1 to D32, and updates the contents of the memory while using the specified time slots D1 to D32.

  In the repeater 2 that has transmitted the time slot request data, when the time slot designation data is received by the transmission unit 22, the control unit 23 controls the wireless communication unit 21 to notify the fire detector 1 that has transmitted the registration request data. On the other hand, time slot designation data is transmitted as a radio signal. The time slot designation data includes the frame start time as in the registration data of the first embodiment.

  In the fire detector 1 that has transmitted the registration request data, when the control unit 13 obtains the time slot designation data from the radio signal received by the radio communication unit 12, the time slot designated in the time slot designation data is used thereafter. A radio signal is transmitted to the repeater 2 using D1 to D32.

  If the said structure is employ | adopted, compared with the case of Embodiment 3, the load concerning the repeater 2 and the traffic of the transmission line Ls can be reduced. Further, by reducing the load applied to the repeater 2, the manufacturing cost of the repeater 2 can be reduced by using an inexpensive microcomputer as the control unit 23 of the repeater 2.

  Each repeater 2 is set with a unique ID in advance, and the time slot request data includes the ID of the repeater 2 as the transmission source. Stores the information on which frequency channel the repeater 2 uses, and the control unit 33 of the monitoring panel 3 transmits the time slot request data by retrieving the ID contained in the time slot request data from the memory. It is good also as a structure which obtains the frequency channel which 2 uses. In this case, the ID of the repeater 2 is used as information indicating the frequency channel.

(Embodiment 5)
Since the basic configuration of the present embodiment is the same as that of the fourth embodiment, illustration and description of portions common to the fourth embodiment are omitted.

  In the first to fourth embodiments, the first time slot B of the frame is used in common for all the repeaters 2 to transmit the radio signal from the repeater 2 to the fire detector 1. When there are a plurality of repeaters 2 that use one frequency channel, time slots D1 to D32 that are normally used for transmission from the fire detector 1 are also allocated to the repeaters 2.

  Specifically, the monitoring panel 3 manages the time slots D1 to D32 of each frequency channel, for example, as in the fourth embodiment. The memory of the control unit 33 of the monitoring panel 3 stores information about which frequency channel is used for each repeater 2 registered in the manner described later, and which time slot B, D1 for transmitting a radio signal. To D32 are stored.

  An example of the operation will be described. When the repeater 2 is newly added and the frequency channel to be used is set, the control unit 23 of the added repeater 2 controls the transmission unit 22 to register registration request data including information on the set frequency channel. Transmit to the monitoring panel 3.

  In the monitoring panel 3, when the registration request data is received by the transmission unit 31, the control unit 33 searches the memory for a repeater 2 that uses the same frequency channel as the frequency channel indicated in the registration request data, and the search result. In response to this, it generates downlink time slot designation data for designating time slots B and D1 to D32 used for transmission of radio signals from the repeater 2 to the fire detector 1, and controls the transmission unit 31 to request registration. The downlink time slot designation data is transmitted to the repeater 2 that has transmitted the data. In the downlink time slot designation data, if the repeater 2 corresponding to the above condition does not exist as a result of the search, the first time slot B of the frame is designated as usual, and if the repeater 2 as described above exists, the second time slot B is designated. Of the subsequent unused time slots D1 to D32, for example, the time slot D1 to D32 having the earliest timing in the frame is designated. In addition, when the time slot search data described in the fourth embodiment is received by the transmission unit 31 and the time slots D1 to D32 used for transmitting the radio signal from the fire detector 1 to the repeater 2 are specified, The time slots D1 to D32 whose timing in the frame is later than the time slots B and D1 to D32 assigned to the repeater 2 that transmitted the time slot search data are designated.

  According to the above-described configuration, since the radio signals do not collide with each other between the repeaters 2, a plurality of relays in which the fire detectors 1 are arranged in areas where the same communicable ranges overlap with each other are used. The operation | movement which the apparatus 2 transmits a radio signal in the same flame | frame becomes possible.

  Here, in the present embodiment, the fire detector 1 and the repeater 2 each have a time measuring unit (not shown) for measuring time, and the start of each time slot B, D1 to D32 is based on the time by the time measuring unit. When determining the timing, the monitoring panel 3 is provided with a reference timing unit, and the fire detector 1 and the repeater 2 correct the time of its own timing unit in accordance with the reference timing unit of the monitoring panel 3 every predetermined time. May be. If this configuration is adopted, a timing shift between the repeater 2 and the fire detector 1 due to a time-dependent change of the timing unit is corrected. Specifically, for example, the control unit 33 of the monitoring panel 3 controls the transmission unit 31 at predetermined intervals to transmit time correction data indicating the time by the reference clock unit to each repeater 2. In the repeater 2 in which the time correction data is received by the transmission unit 22, the control unit 23 corrects the time of its own clock unit to the time indicated in the time correction data and controls the wireless communication unit 21. Time correction data is transmitted as a radio signal to each fire detector 1 associated with itself. In the fire detector 1, when the time correction data is obtained from the radio signal received by the radio communication unit 12, the time of its own clock unit is corrected to the time indicated in the time correction data. Alternatively, in the repeater 2, the control unit 23 counts the number of frames, and resets the count value and controls the transmission unit 22 every time the count value reaches a predetermined number (that is, every time a certain time elapses). Time request data for requesting time correction data is transmitted to the monitoring panel 3. When the time request data is received by the transmission unit 31 in the monitoring panel 3, the control unit 33 controls the transmission unit 31. The time correction data may be transmitted to the repeater 2 that has transmitted. With the latter configuration, it is possible to adopt the first to fourth embodiments by changing the timing of transmitting the time correction data radio signal between the repeaters 2 that use the same frequency channel.

  In Embodiments 2 to 4 and this embodiment, the fire detector 1 and the repeater 2 have a buzzer, a light emitting diode, a liquid crystal panel, and a notification unit (not shown) controlled by the control units 13 and 23. When the unused time slots D1 to D32 do not exist as a result of the search, the control units 13 and 23 control the notification unit, and the buzzer sounds, the light-emitting diodes are turned on, or displayed on the liquid crystal panel. The operator may be notified that there are no unused time slots D1 to D32.

It is explanatory drawing which shows the structure common to each embodiment of this invention. It is a block diagram which shows the structure of a fire detector same as the above. It is a block diagram which shows the structure of a repeater same as the above. It is a block diagram which shows the structure of the monitoring board same as the above. It is explanatory drawing which shows the structure of the flame | frame of the radio signal used for the radio | wireless communication between a repeater and a fire detector in the same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fire detector 2 Repeater 3 Monitoring board 11 Sensing part 12,21 Wireless communication part 13,23,33 Control part 22,31 Transmission part 24 Operation part Ls Transmission path

Claims (6)

Multiple fire detectors that detect fire and transmit fire detection data with radio signals using radio waves as media, and multiple relays of fire detection data obtained by receiving wireless signals transmitted from fire detectors Each of the repeaters, and a monitoring panel connected to each repeater via a transmission path, and performing a predetermined fire alarm process when fire detection data is transmitted from any of the repeaters,
The fire detector is a sensor that detects fire by detecting at least one of smoke and heat generated by a fire, a wireless communication means that transmits a radio signal, and a fire that is detected by the sensor. Control means for controlling the wireless communication means to transmit the fire detection data by a wireless signal,
The repeater includes a wireless communication unit that receives a wireless signal transmitted by the wireless communication unit of the fire detector, a transmission unit that transmits data to and from the monitoring panel via a transmission line, a wireless communication unit, and a transmission unit. Control means for controlling each,
The monitoring panel is data relayed from the repeater via the transmission means for transmitting / receiving data to / from the repeater via the transmission line, the notification means for notifying the occurrence of a fire, and the transmission line and the transmission means. A control means for controlling the notification means when the fire detection data is acquired and notifying the occurrence of a fire,
The wireless communication means of the fire detector and the wireless communication means of the repeater coincide with each other between the repeater and the fire detector that perform wireless communication with each other among a plurality of frequency channels when transmitting and receiving the wireless signal of the fire detection data. As described above, a fire using a time slot preset for each fire detector among a plurality of time slots constituting a time-division multiplexing frame in a frequency channel preset for each repeater and fire detector. A notification system,
A fire alarm system, wherein time slots used by a fire detector for transmitting a radio signal to a repeater are assigned to a plurality of repeaters using the same frequency channel so as not to overlap each other. The time slots used to transmit radio signals from the fire detector to the repeater are divided into groups for each frequency channel used.
The repeater has setting means for setting which group of time slots to use,
The repeater control means designates only the time slot in the group set in the setting means when designating the time slot used for transmission of wireless communication to the repeater to the fire detector. The fire alarm system according to claim 1. The control means of the repeater controls the transmission means when a new fire sensor is associated, and requests a time slot usage notification including information on the frequency channel used by itself. Send search data to other repeaters via the transmission line,
The control means of the other repeater that has received the time slot search data via the transmission line and the transmission means transmits the transmission means when the frequency channel used by itself matches the frequency channel included in the time slot search data. To control the time slot notification data indicating the time slot that is being used to transmit to the repeater that transmitted the time slot search data via the transmission line,
The control means of the repeater that has transmitted the time slot search data assigns the time slot determined to be unused based on the time slot notification data received by the transmission means and the time slot used by itself to the fire detector. The fire alarm system according to claim 1. The monitoring panel includes storage means for storing information indicating which time slot is already used in each frequency channel,
The repeater control means controls the transmission means when a new fire detector is associated, and requests the allocation of an unused time slot including information on the frequency channel used by itself. Request data is sent to the monitoring board via the transmission line,
When the time slot request data is received by the transmission means, the control means of the monitoring panel, when there is an unused time slot in the frequency channel used by the repeater that transmitted the time slot request data, Sending time slot indication data indicating one of the slots to the repeater that sent the time slot request data via the transmission means and the transmission path;
The control means of the repeater that has transmitted the time slot request data assigns the time slot indicated in the time slot instruction data to the fire detector when the time slot instruction data is received by the transmission means. The fire alarm system according to 1.   In each repeater that uses a frequency channel that is common to each other, the wireless communication means uses a time slot that is different from any of the other repeaters and fire detectors that use the same frequency channel in transmitting a wireless signal. The fire alarm system according to any one of claims 1 to 4. The monitoring panel, each repeater, and each fire detector have timekeeping means that time each time, and each repeater and each fire detector uses its own timekeeping timing to start the time slot for transmitting and receiving radio signals. Based on the time of day,
In the monitoring panel, the control means periodically controls the transmission means for each repeater to transmit time data indicating the time by its own time measuring means,
In each repeater, when the time data is received by the transmission means, the control means corrects the time of its time measuring means based on the time data and controls the wireless communication means to transmit the time data to the radio signal. To send
6. In each fire detector, when the time data is obtained from the radio signal received by the wireless communication means, the control means corrects the time of its time measuring means based on the time data. The fire alarm system described.

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