JP6138984B2 - Alarm system - Google Patents

Description

  The present invention relates to an alarm system that transmits and receives radio signals between a plurality of alarm devices.

  The fire alarm system as an example of the alarm system is composed of a plurality of fire alarms. When the fire alarm detects a fire, the alarm means notifies the fire and sends a radio signal to other fire alarms. On the other hand, the other fire alarm device receives the radio signal and notifies the fire by the notification means so that the fire can be notified in the entire system.

  Here, one of the plurality of fire alarms is set as a master unit, the remaining fire alarms are set as slave units, and the master unit is arranged so that all the plurality of slave units are included in the transmission range of the radio signal, Periodic monitoring is performed by periodically transmitting and receiving radio signals between the master unit and the slave unit, and the control unit of the master unit receives an interlock request signal including a notification message for notifying the occurrence of a fire by the receiving unit. Upon reception, all other slave units also send an interlocking command signal including a notification message for driving the notification unit from the transmission unit, and the slave unit control unit detects a fire with the fire detection unit of the slave unit. Then, after transmitting the interlock request signal from the transmitting unit of the slave unit, if the receiving unit of the slave unit receives the interlock command signal transmitted from the transmitting unit of the master unit, the transmitting unit of the slave unit Some stop transmission of the interlock request signal ( In example, see Patent Document 1).

Japanese Patent No. 4466792

  In the fire alarm system of Patent Document 1 above, if an alarm device other than the child device that detects the fire receives either the interlock request signal from the child device that detected the fire or the interlock command signal from the master device, The notification means can be driven. In this system, the transmission timing of the interlocking request signal and the transmission timing of the interlocking command signal are transmitted after being divided in time. It is also desired to be able to notify.

  The present invention has been made in order to solve the above-described problems. In an alarm system having an upper alarm device and a plurality of alarm devices belonging to the lower layer, the system as a whole can be notified of an abnormality. An alarm system that can be used is provided.

The alarm system according to the present invention includes a state detection unit that detects an abnormality in the installation environment, a transmission / reception unit that transmits and receives a radio signal, a notification unit that notifies that an abnormality in the installation environment is detected by the state detection unit, and the state When detecting an abnormality in the detection unit, in order to drive the notification unit and to drive the notification unit of all other alarm devices, a control unit that transmits an interlocking signal notifying the occurrence of abnormality from the transmission / reception unit, An alarm that transmits and receives radio signals between the plurality of alarm devices, and notifies all of the alarm devices of the abnormality when any state detection unit of the alarm device detects the abnormality. In the system, the plurality of alarm devices are provided with a hierarchy, and the upper alarm devices are arranged in an area where radio signals can be transmitted and received with all lower alarm devices belonging to the immediate lower layer , and the control unit of the upper alarm device is ,Previous Upon receiving the interlock signal, for driving the alarm all notifying means of the lower, the interlocking signal is transferred from the transceiver to the lower alarm all, the lower the alarm at all a predetermined time set at different discrete values, having a transfer confirmation period attempting to receive the transferred interlocking signal after transmitting the interlock signal, after transmitting the pre-Symbol interlocking signal, the transfer When the transferred interlocking signal cannot be received within the confirmation period, the control unit retransmits the interlocking signal transmitted from the transmitting / receiving unit , and the higher-order alarm device that transmitted the interlocking signal when the transmission of the signal is completed, the interlock signal is retransmitted from the transmitting and receiving unit after a lapse of idle period is set to a predetermined short time than alarm all the transfer confirmation period of the lower And wherein the door.

In addition, the alarm system of the present invention includes a state detection unit that detects an abnormality of the installation environment, a transmission / reception unit that transmits and receives a radio signal, and a notification unit that notifies that an abnormality of the installation environment is detected by the state detection unit, When the abnormality is detected by the state detection unit, the control unit drives the notifying unit and transmits an interlocking signal for notifying the occurrence of the abnormality from the transmitting / receiving unit in order to drive the notifying unit of all other alarm devices. A plurality of alarm devices that transmit and receive wireless signals between the plurality of alarm devices, and when any state detection unit of the alarm device detects an abnormality, all alarm devices are notified of the abnormality. In the alarm system, a hierarchy is provided in the plurality of alarm devices, and the upper alarm device is arranged in an area where radio signals can be transmitted and received with all lower alarm devices belonging to the immediate lower layer , the lower alarm device, Said After the transmission of the motion signal has been completed, after the first rest period has elapsed, the control unit the interlocking signal is retransmitted from the transmitting and receiving unit, the control unit of the alarm device of the upper, the state detecting unit is abnormal , The interlocking signal is transmitted from the transmission / reception unit, and further, the transmission ends, and after the second suspension period shorter than the first suspension period has elapsed, the state detection unit detects an abnormality. when not detected, when receiving the interlock signal transmitted from the lower alarm device, the interlock signal is transmitted from the transceiver unit to the lower alarm all the previous SL lower alarm A predetermined time that is shorter than the first suspension period, longer than the second suspension period, and set to different values for each of the lower-order alarm devices, and the transfer is performed after transmitting the interlocking signal. attempts to receive the by interlocking signal If you can not receive the transferred interlocking signal to rolling the transmission confirmation period, without waiting for the elapse of the first idle period, characterized in that to re-transmit the interlock signal transmitted from the transceiver unit.

  The present invention includes a state detection unit that detects an abnormality in the installation environment, a transmission / reception unit that transmits and receives radio signals, a notification unit that notifies that an abnormality in the installation environment is detected by the state detection unit, the transmission / reception unit, and the notification A plurality of alarm devices having a control unit for controlling the means, one of the plurality of alarm devices as a parent alarm device, the other alarm device as a child alarm device, between the plurality of alarm devices In an alarm system that transmits / receives a radio signal and reports an abnormality in all alarm devices when any state detection unit of the alarm device detects an abnormality, the parent alarm device is a wireless device for all of the plurality of child alarm devices. The transmission range of the signal is arranged in an overlapping region, the transmission / reception unit of the parent alarm device includes all of the plurality of child alarm devices within the transmission range of the radio signal, and the control unit of the child alarm device has a state detection unit When an abnormality is detected, all other alarms are reported. In order to drive the means, an interlocking signal for notifying the occurrence of an abnormality is transmitted from the transmission / reception unit to all other alarm devices, and further, the transmission ends and a first pause period that is a predetermined time When the state detector detects an abnormality, the control unit of the parent alarm device transmits an interlocking signal for notifying the occurrence of the abnormality in order to drive the notification means of all the child alarm devices. The transmission / reception unit transmits to all child alarm devices, and further, the transmission ends, and after a second pause period, which is a predetermined time shorter than the first pause period, has elapsed, the status is detected. When the interlock signal transmitted from the child alarm device is received when the unit has not detected an abnormality, the interlock transfer signal is sent to all the other child alarms in order to drive the notification means of all other child alarm devices. Send to the alarm device, the child alarm device The parent alarm device is a predetermined time set individually for all the child alarm devices so as to be shorter than the first suspension period and longer than the second suspension period, and after transmitting the interlock signal The control unit of the child alarm device that has transmitted the interlock signal and receives the interlock transfer signal transmitted from the parent alarm device within the transfer confirmation period. When it is impossible, the interlocking signal is retransmitted without waiting for the elapse of the first suspension period from the end of transmission of the interlocking signal.

  In addition, the control unit of the parent alarm device that has transmitted the interlock transfer signal transmits the interlock transfer signal to all other child alarm devices from the transmitter / receiver after the retransmission period of the interlock signal ends. It is made to retransmit.

  Further, the control unit of the child alarm device that has transmitted the interlocking signal provides a transfer confirmation period of a predetermined time after the transmission of the interlocking signal is completed, and the transmitter transmitted from the parent alarm device within the transfer confirmation period. When the interlocking transfer signal cannot be received, the interlocking signal is transmitted from the transmission / reception unit to all other alarm devices again without waiting for the transmission period of the interlocking transfer signal. And

  The transfer confirmation period is a predetermined time set individually for all the child alarm devices, and the control unit of the child alarm device activates the reception function of the transmission / reception unit to detect the carrier. If the carrier is detected during the transfer confirmation period, the interlock signal is not transmitted from the transmission / reception unit.

  In addition, when the state detection unit detects an abnormality, the control unit of the parent alarm device sends an interlocking signal for notifying the occurrence of the abnormality to drive the notification means of all other child alarm devices. To the other child alarm devices, and after the transmission of the interlocking signal is completed and a predetermined period of time has elapsed, the interlocking signal is transmitted from the transmitting / receiving unit to all the other child alarm devices. The suspension period is set to a predetermined time shorter than the transfer confirmation period.

  In addition, the control unit of the alarm device activates the reception function of the transmission / reception unit and performs carrier detection only during a predetermined carrier sense period before starting transmission of the radio signal from the transmission / reception unit. If no carrier is detected during the period, the radio signal is transmitted from the transmission / reception unit, and the carrier sense period is set to a predetermined time longer than the pause period and the transfer confirmation period. To do.

  The interlock signal and the interlock transfer signal are retransmitted a plurality of times.

  The interlock signal is a signal having a predetermined transmission pattern including a transmission period in which the signal is repeatedly transmitted, and the predetermined transmission pattern includes the transmission period and a transmission suspension period in which transmission of the interlock signal is suspended. , And repeatedly executed alternately.

  In addition, the control unit of the alarm device does not perform signal reception processing during the transmission suspension period.

The present invention includes a state detection unit that detects an abnormality in the installation environment, a transmission / reception unit that transmits and receives a radio signal, a notification unit that notifies that an abnormality in the installation environment is detected by the state detection unit, and the state detection unit. A plurality of control units that, when detecting an abnormality, drive the notifying unit and transmit an interlocking signal notifying the occurrence of an abnormality from the transmitting / receiving unit in order to drive the notifying unit of all other alarm devices In the alarm system that transmits and receives radio signals between the plurality of alarm devices, and notifies any abnormality in all alarm devices when any state detection unit of the alarm device detects an abnormality, The plurality of alarm devices are provided with a hierarchy, and the upper alarm devices are arranged in an area where radio signals can be transmitted and received with all the lower alarm devices belonging to the immediate lower layer , and the control unit of the upper alarm device is connected to the interlock. Receive signal Then, in order to drive the alarm all notifying means of the lower, the interlocking signal is transferred from the transceiver to the lower alarm all, the lower alarm device are different individual from each other at all a predetermined time is set to a value, it has a transfer confirmation period attempting to receive the transferred interlocking signal after transmitting the interlock signal, after transmitting the interlock signal, the in the transfer confirmation period When the transferred interlocking signal cannot be received, the control unit retransmits the interlocking signal transmitted from the transmitting / receiving unit , and the upper alarm device that has transmitted the interlocking signal finishes transmitting the interlocking signal. when, since the interlocking signal after the pause period is set to a shorter predetermined time than alarm all the transfer confirmation period of the lower has elapsed it is intended to re-transmitted from the transceiver unit All alarms by receiving the transfer of interlocking signal from the interlocking signal or higher alarm from the lower alarm device, it is possible to drive the notification means, can be notified of the abnormal.

The present invention also includes a state detection unit that detects an abnormality in the installation environment, a transmission / reception unit that transmits and receives a radio signal, a notification unit that notifies that an abnormality in the installation environment is detected by the state detection unit, and the state detection A controller that transmits an interlocking signal for notifying the occurrence of an abnormality from the transceiver unit in order to drive the notifying unit and to drive the notifying unit of all other alarm devices, An alarm system that includes a plurality of alarm devices, transmits and receives wireless signals between the plurality of alarm devices, and notifies any abnormality in all alarm devices when any state detection unit of the alarm device detects the abnormality The plurality of alarm devices are provided with a hierarchy, and the upper alarm device is arranged in an area where radio signals can be transmitted and received with all the lower alarm devices belonging to the immediately lower layer , and the lower alarm device is connected to the interlocking signal. Send After completion, after the first rest period has elapsed, the control unit the interlocking signal is retransmitted from the transmitting and receiving unit, the control unit of the alarm device of the higher-level, the state detection unit detects an abnormality, the When the interlocking signal is transmitted from the transmission / reception unit, and further, the transmission ends, and after the second suspension period shorter than the first suspension period has elapsed, the state detection unit detects no abnormality. , when receiving the interlock signal transmitted from the lower alarm device, to transfer the interlocking signal from said transceiver unit relative to the lower alarm all, the lower alarm device includes a first rest period shorter than, longer than the second rest period, a predetermined time set in the different discrete values in alarm all the lower, the transfer of the transferred interlocking signal after transmitting the interlock signal rolling Oku確that Ru attempt the reception If you can not receive the transferred interlocking signal within the period, without waiting for the elapse of the first idle period, since the interlocking signal transmitted is intended for re-transmitted from the transceiver, all alarms are lower by receiving the transfer of interlocking signal from the interlocking signal or higher alarm from the alarm device, it is possible to drive the notification means, can be notified of the abnormal.

  The present invention also includes a state detection unit that detects an abnormality in the installation environment, a transmission / reception unit that transmits / receives a radio signal, a notification unit that notifies that an abnormality in the installation environment is detected by the state detection unit, and the transmission / reception unit And a plurality of alarm devices having a control unit for controlling the notification means, one of the plurality of alarm devices as a parent alarm device, the other alarm device as a child alarm device, In an alarm system that transmits and receives radio signals between them, and notifies any abnormality in all alarm devices when any state detection unit of the alarm device detects an abnormality, the parent alarm device includes all of the plurality of child alarm devices. The radio alarm transmission range is arranged in an overlapping region, and the parent alarm transmitter / receiver includes all of the plurality of child alarm devices within the radio signal transmission range, and the child alarm control unit detects the status When the unit detects an abnormality, all other alarms In order to drive the notification means, the interlocking signal for notifying the occurrence of abnormality is transmitted from the transmission / reception unit to all other alarm devices, and further, the transmission ends, and the first time which is a predetermined time The control unit of the parent alarm device notifies the occurrence of an abnormality in order to drive the notification means of all the child alarm devices when the state detection unit detects an abnormality when the pause period has elapsed. Is transmitted from the transmission / reception unit to all child alarm devices, and further, the transmission is terminated and retransmitted after a second pause period, which is a predetermined time shorter than the first pause period, When the interlock signal transmitted from the child alarm device is received when the state detection unit has not detected an abnormality, all other interlock transfer signals are sent to drive the notification means of all other child alarm devices. Send to the child alarm The reporting device is a predetermined time set individually for all the child alarm devices so as to be shorter than the first suspension period and longer than the second suspension period, and after transmitting the interlock signal, The control unit of the child alarm device that has a transfer confirmation period that attempts to receive the interlock transfer signal from the parent alarm device, and the control unit of the child alarm device that has transmitted the interlock signal transmits the interlock transfer transmitted from the parent alarm device within the transfer confirmation period. When the signal cannot be received, the interlock signal is retransmitted without waiting for the elapse of the first pause period from the end of transmission of the interlock signal. By receiving this interlocking transfer signal, the notification means can be driven, and in the alarm system having the parent alarm device and the child alarm device, the abnormality can be notified throughout the system.

  In addition, the control unit of the parent alarm device that has transmitted the interlock transfer signal transmits the interlock transfer signal to all other child alarm devices from the transmitter / receiver after the retransmission period of the interlock signal ends. All the other alarm devices can drive the notification means by receiving the interlocking signal from the child alarm device or the interlocking transfer signal from the parent alarm device that are transmitted alternately. In an alarm system having a parent alarm device and a child alarm device, an abnormality can be reported throughout the system.

  Further, the control unit of the child alarm device that has transmitted the interlocking signal provides a transfer confirmation period of a predetermined time after the transmission of the interlocking signal is completed, and the transmitter transmitted from the parent alarm device within the transfer confirmation period. When the interlocking transfer signal cannot be received, the interlocking signal is transmitted again from the transmission / reception unit to all the other alarm devices without waiting for the transmission period of the interlocking transfer signal to elapse. Therefore, all the other alarm devices can receive the interlocking signal and the interlocking transfer signal early.

  The transfer confirmation period is a predetermined time set individually for all the child alarm devices, and the control unit of the child alarm device activates the reception function of the transmission / reception unit to detect the carrier. If the carrier is detected during the transfer confirmation period, the interlock signal is not transmitted from the transmission / reception unit. When a plurality of child alarm devices detect an abnormality at the same time and transmit an interlocking signal, the signals collide with each other, and it is considered that other alarm devices cannot receive the interlocking signal. However, when the interlock signal is transmitted again, the slave alarm device with a short transfer confirmation period among the child alarm devices that detect an abnormality does not receive the interlock signal from the child alarm device with the long transfer confirmation period. Since the carrier is not detected during the transfer confirmation period, the interlocking signal is transmitted. On the other hand, the child alarm device with a long transfer confirmation period transmits the interlock signal from the child alarm unit with the short transfer confirmation period, and the transfer confirmation period. Since the carrier is detected by the carrier detection, the interlocking signal is not transmitted, so that the interlocking signal is transmitted only from one of the child alarm devices, so that no signal collision occurs. For this reason, the other alarm devices can reliably receive the interlocking signal.

  In addition, when the state detection unit detects an abnormality, the control unit of the parent alarm device sends an interlocking signal for notifying the occurrence of the abnormality to drive the notification means of all other child alarm devices. To the other child alarm devices, and after the transmission of the interlocking signal is completed and a predetermined period of time has elapsed, the interlocking signal is transmitted from the transmitting / receiving unit to all the other child alarm devices. The pause period is set to a predetermined time shorter than the transfer confirmation period. When the parent alarm device and the child alarm device detect the abnormality at the same time and transmit the interlocking signal, the signals collide with each other, and it is considered that the other alarm devices cannot receive the interlocking signal. However, when transmitting the interlock signal again, among the alarm devices that have detected an abnormality, the parent alarm device does not transmit the interlock signal from the child alarm device during the transfer confirmation period. On the other hand, the slave alarm device transmits the interlock signal from the master alarm device, and since the carrier is detected by carrier detection during the transfer confirmation period, the interlock signal is not transmitted, so the interlock signal is transmitted only from the parent alarm device. Signal collision does not occur. Therefore, other alarm devices can receive the interlocking signal from the parent alarm device. As a result, the interlock signal from the parent alarm device can be received from the relationship of the arrangement, but the child alarm device (hidden terminal) that cannot receive the interlock signal from the child alarm device that has detected an abnormality quickly outputs the interlock signal. The notification means can be driven upon reception.

  In addition, the control unit of the alarm device activates the reception function of the transmission / reception unit and performs carrier detection only during a predetermined carrier sense period before starting transmission of the radio signal from the transmission / reception unit. If no carrier is detected during the period, the radio signal is transmitted from the transceiver, and the carrier sense period is set to a predetermined time longer than the pause period and the transfer confirmation period. Since the interlock signal from the alarm device that needs to transmit the interlock signal again is given priority over the interlock signal from the alarm device that needs to transmit the interlock signal for the first time, avoiding a collision. Information delay can be reduced.

  In addition, since the re-transmission of the interlocking signal and the interlocking transfer signal is performed a plurality of times, an abnormality can be notified throughout the system.

  The interlock signal is a signal having a predetermined transmission pattern including a transmission period in which the signal is repeatedly transmitted, and the predetermined transmission pattern includes the transmission period and a transmission suspension period in which transmission of the interlock signal is suspended. Since these are repeatedly executed alternately, the other alarm devices can receive the interlocking signal transmitted by the alarm device.

  Further, since the control unit of the alarm device does not perform signal reception processing during the transmission suspension period, power consumption can be reduced.

1 is a configuration diagram of an alarm system according to Embodiment 1. FIG. 2 is a functional block diagram of a fire alarm device according to Embodiment 1. FIG. 3 is a timing chart illustrating a transmission operation of the fire alarm device according to the first embodiment. 3 is a timing chart illustrating a reception operation of the fire alarm device according to the first embodiment. It is a figure explaining the transmission / reception operation | movement of the interlocking signal when the main | base station which concerns on Embodiment 1 detects a fire. It is a figure explaining the transmission / reception operation | movement of the interlocking signal when the subunit | mobile_unit based on Embodiment 1 detects a fire, and the transmission / reception operation of a interlocking transfer signal. In FIG. 6, it is a figure explaining the case where a main unit cannot receive the interlocking signal. It is a figure explaining the case where a plurality of subunits transmit an interlocking signal simultaneously.

Embodiment 1 FIG.
Hereinafter, in the first embodiment, a case where the present invention is applied to an alarm system including a fire alarm device that is driven by a battery and performs wireless communication will be described as an example.

[Configuration of alarm system and fire alarm]
FIG. 1 is a diagram showing a configuration of an alarm system 200 according to an embodiment of the present invention. The alarm system 200 includes a plurality of fire alarms 100. Each of these fire alarm devices 100 has a function of detecting a fire and a function of independently alarming.

  As will be described later, all of the fire alarm devices 100 are configured in the same manner, and can operate as a parent device or a child device by setting of an operation setting unit (not shown). In addition, in order to distinguish and explain each fire alarm device 100, the fire alarm device A, the fire alarm device B, the fire alarm device C, and the fire alarm device D may be referred to. In the first embodiment, the fire alarm device When A is a parent device (parent alarm device), fire alarm devices B to D are child devices (child alarm devices), and are called parent device A, child device B, child device C, child device D There is also. Here, the fire alarm A to the fire alarm D belong to one same group. Moreover, in FIG. 1, the continuous line which connects each fire alarm device 100 has shown that it can communicate mutually by radio | wireless communication. However, as for the arrangement of the fire alarm devices A to D, the parent device A is arranged in a region where the transmission ranges of the radio signals of all of the plurality of child devices B to D overlap, and the transmission / reception circuits 5 of the parent device A are plural. If it is the structure which contains all the subunit | mobile_units B-D in the transmission range of a radio signal, it will be realized as a system. In other words, the slave units B to D need only be arranged so as to communicate with the master unit A, and may not be arranged to communicate with all the slave units B to D.

  FIG. 2 is a functional block diagram showing the main configuration of the fire alarm 100 according to the embodiment of the present invention.

  In FIG. 2, the fire alarm 100 includes a control circuit 1, a battery 2, a power supply circuit 3, a battery voltage detection circuit 4, a transmission / reception circuit 5, an antenna 6, a fire detection circuit 7, an alarm sound control circuit 8, and an indicator lamp circuit 9. Prepare.

  The battery 2 supplies DC power to the power supply circuit 3. The power supply 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, the alarm sound control circuit 8, and the indicator lamp circuit 9.

  The battery voltage detection circuit 4 detects the voltage of the battery 2 applied to the power supply circuit 3 and outputs a battery voltage detection signal corresponding to the detected voltage to the control circuit 1. The battery voltage detection circuit 4 outputs a signal to the control circuit 1 when detecting that the remaining battery level has decreased or the battery depletion threshold has been exceeded, and the alarm sound control circuit 8 and the indicator lamp circuit 9 are connected. The transmitter / receiver circuit 5 outputs a state signal including battery state information.

  The fire detection circuit 7 corresponds to a state detection unit of the present invention, detects a physical quantity or a physical change of a detection object such as smoke or heat based on a fire phenomenon, and outputs a signal corresponding to the detection content to the control circuit 1 To do. The alarm sound control circuit 8 corresponds to the notification means of the present invention, and is a circuit that controls the operation of sounding by a buzzer / speaker or the like. The indicator lamp circuit 9 corresponds to the notification means of the present invention, and 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 51 and a reception circuit 52. The reception circuit 52 is controlled by the control circuit 1 to perform intermittent reception operation at a predetermined cycle to detect a radio signal input from the antenna 6 and perform reception processing in the case of a signal addressed to itself. In the case of a signal other than that addressed to itself, no reception process is performed. The received signal is output to the control circuit 1. Further, the transmission circuit 51 is controlled by the control circuit 1 to perform transmission processing of a radio signal such as a status signal and an interlock signal described later.

  The control circuit 1 has a function of discriminating a fire state or the like based on a signal output from the fire detection circuit 7. In addition, when it is determined that the state is a fire state, the alarm sound control circuit 8 and the indicator lamp circuit 9 are controlled to issue an alarm (notification) by sound and an 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, are transmitted to another fire alarm device.

  The storage element 11 is a nonvolatile memory such as an EEPROM, and stores programs executed by the control circuit 1 and various data. Also, transmission periods Tx1, Tx2, Tx3, transmission suspension periods ST1, ST2, and intermittent reception intervals Ts, carrier sense period C, transfer confirmation period J, inter-block suspension periods M1, M2, interlocking signal transmission period N1, and interlocking described later The transfer signal transmission period N2 is stored, and the control circuit 1 controls the transmission / reception operation of the transmission / reception circuit 5 according to these data.

[Transmission / reception]
Next, the transmission operation and the reception operation of the fire alarm device 100 will be described. FIG. 3 is a timing chart showing the transmission operation of the fire alarm device 100 according to the first embodiment, and FIG. 4 is a timing chart showing the reception operation of the fire alarm device 100 according to the first embodiment.

(Transmission operation)
As shown in FIG. 3, when transmitting a signal such as a status signal or an interlocking signal, which will be described later, the control circuit 1 controls the transmission circuit 51 to transmit a signal during a transmission period and stop transmission of the signal. The pause period is alternately repeated. In the first embodiment, the transmission processing is performed so that the transmission time is 3 seconds or less and the transmission suspension time is 2 seconds or more in conformity with the standard RCR STD-30. As shown in FIG. 3, for example, three transmission periods and two transmission suspension periods are repeated in the order of transmission period Tx1, transmission suspension period ST1, transmission period Tx2, transmission suspension period ST2, and transmission period Tx3. In the first embodiment, these are collectively referred to as one transmission block, and this one block corresponds to the “predetermined transmission pattern” of the present invention. When a status signal or the like is transmitted by an interlocking signal transmission or regular transmission operation, the transmission operation is performed in units of one block. In the present embodiment, reception processing by the reception circuit 52 is not performed during the transmission periods Tx1, Tx2, and Tx3, and reception processing by the reception circuit 52 is not performed during the transmission suspension periods ST1 and ST2. For example, the transmission 1 block is set such that the transmission period Tx1 = 3 seconds, the transmission period Tx2 = 2.5 seconds, the transmission period Tx3 = 3 seconds, the transmission suspension period ST1 = 2 seconds, and the transmission suspension period ST2 = 2 seconds. That is, transmission 1 block = 12.5 seconds. Therefore, an inter-block pause period M1, an interlocking signal transmission period N1, and an interlocking transfer signal transmission period N2, which will be described later, are also used to refer to the transmission 1 block. 5 seconds.

  The fire alarm device 100 performs carrier sense (carrier detection) for a predetermined time before transmitting various radio signals. The carrier sense period C is longer than the transmission suspension periods ST1 and ST2. For example, it is set to 4 seconds. By setting the carrier sense period C in this manner, when a carrier is detected by carrier sense, it is determined that another fire alarm device 100 is transmitting a signal with the transmission pattern shown in FIG. Can be avoided without transmitting the signal. Moreover, when a carrier is not detected by carrier sense, it can be judged that the other fire alarm device 100 is not transmitting a signal with the transmission pattern shown in FIG. 3, and a signal can be transmitted. The carrier sense period C only needs to be longer than the transmission suspension periods ST1 and ST2, and may be longer than 2 seconds in the present embodiment.

(Reception operation)
As shown in FIG. 4, the control circuit 1 activates the reception circuit 52 every intermittent reception interval Ts (for example, 7 seconds), and intermittent reception F1, F2, F3. . . I do. Then, it is checked whether or not a predetermined radio signal can be received. If the radio signal can be detected, reception processing is performed. If the wireless signal cannot be detected, the operation of the receiving circuit 52 is stopped. In this way, the current consumption of the receiving circuit 52 can be greatly reduced by starting the receiving circuit 52 at every intermittent reception interval Ts and leaving it in a stopped state in other cases. In the fire alarm 100, the intermittent reception interval Ts is 7 seconds, and the period from the transmission suspension period ST1 to the transmission suspension period ST2 in the transmission 1 block is set to 6.5 seconds, which is shorter than the intermittent reception interval Ts. Therefore, the radio signal transmitted from the other fire alarm device 100 can be received in any one of the transmission periods Tx1, Tx2, and Tx3 in the transmission 1 block. However, the predetermined transmission pattern (relationship between the transmission period and the transmission suspension period) as the transmission operation and the intermittent reception interval Ts as the reception operation may not be limited to the above.

[Periodic sending operation]
In the alarm system 200 including the fire alarm 100 configured as described above, in order to check the status of each fire alarm 100, periodic transmission for status confirmation is performed during fire monitoring (steady state). Yes.

(Periodic transmission of parent device)
First, periodic transmission performed by the parent device A (fire alarm device A) for the child device will be described.

  The master unit A uses the group ID to which it belongs, a self-address for identifying the transmission source, and information including its own status as status signals for every slave unit B to D ( It transmits all at once to the fire alarms B to D).

  The subunit | mobile_unit BD performs the intermittent reception as mentioned above, and has received the signal addressed to self in this intermittent reception. In this intermittent reception, the slave units B to D determine that the radio wave abnormality has been confirmed when the next periodic transmission cannot be received within the predetermined time G2 since the previous periodic transmission from the master unit A was received. The sub-units B to D that have determined that the radio wave abnormality has been confirmed control the alarm sound control circuit 8 and the indicator lamp circuit 9 to notify the user that a radio wave abnormality has occurred by voice or indicator lamp. On the other hand, if the regular transmission from the parent device A can be received within the predetermined time G2, it is determined that the radio wave abnormality has not occurred and is normal. The predetermined time G2 is longer than the predetermined time G1, which is the periodic transmission cycle of the parent device A. For example, the predetermined time G2 can be approximately three times the predetermined time G1, and the predetermined time G1 = 48 hours. G2 = 144 hours.

(Regular transmission of slave unit)
Next, regular transmission performed by the slave units B to D with respect to the master unit A will be described.

  The slave units B to D transmit the group ID to which the slave unit belongs, the self address for identifying the transmission source, and information including the status of the slave unit B to the master unit A as a status signal. Note that the delay time randomly generated based on the addresses, serial numbers, etc. of the slave units B to D may be increased / decreased to a predetermined time G3 to shift the regular transmission timing of each slave unit B to D. By doing in this way, the probability that the interference by the subunit | mobile_unit BD simultaneously performing regular transmission can generate | occur | produce can be reduced.

  On the other hand, the parent device A performs intermittent reception as described above, and receives a signal addressed to itself in this intermittent reception. In this intermittent reception, if the next periodic transmission cannot be received within a predetermined time G4 since the previous periodic transmission from the subunits B to D was received in this intermittent reception, the parent unit A determines that the occurrence of radio wave abnormality has been confirmed. . The master A that has determined that the radio wave abnormality has been confirmed controls the alarm sound control circuit 8 and the indicator lamp circuit 9 to notify the user that a radio wave abnormality has occurred by means of voice or a display lamp. On the other hand, if the periodic transmission from the slave units B to D can be received within the predetermined time G4, it is determined that the radio wave abnormality has not occurred and is normal. The parent device A determines the presence or absence of radio wave abnormality for each of the child devices B to D registered in its own group. Further, the predetermined time G4 is a time longer than the predetermined time G3, which is the periodic transmission cycle of the slave units B to D, and can be, for example, about three times the predetermined time G3. The predetermined time G3 = 23 hours, The predetermined time G4 = 69 hours.

  Since the status signal transmitted in this periodic transmission includes the self-address of the fire alarm device 100 as the transmission source, which fire alarm device the fire alarm device 100 that received the periodic transmission receives from Can be distinguished. In addition, examples of the status information related to the parent device A and the child devices B to D transmitted in the regular transmission include the remaining battery level, the sensor state of the fire detection circuit 7 (deterioration, contamination, etc.), the number of reception processes (other than prescribed) The number of times of processing for radio). Further, examples of the status information regarding the group include the address and group ID of a slave unit in which an abnormality has occurred, the address and group ID of a slave unit in which wireless communication is not established.

  As described above, as a regular transmission operation (periodic monitoring operation), the parent device A performs periodic transmission to the child devices B to D every predetermined time G1, and the child devices B to D are transmitted from the parent device A. Whether or not a radio wave abnormality has occurred is determined based on whether or not the next periodic transmission has been received within a predetermined time G2 since the previous periodic transmission was received.

  Moreover, the subunit | mobile_unit BD performs regular transmission with respect to the main | base station A every predetermined time G3, and the main | base station A is the predetermined time G4 after receiving the regular transmission from each subunit | mobile_unit B-D last time. The presence / absence of radio wave abnormality is determined based on whether or not the next periodic transmission has been received.

  As described above, the regular monitoring operation is not limited to performing unidirectional communication between the parent device A and the child devices B to D, and may perform bidirectional communication. For example, the parent device A performs periodic transmission to the child devices B to D every predetermined time G5, and the child devices B to D receive the periodic transmission from the parent device A and The base unit A generates a radio wave abnormality depending on whether or not the next periodic response transmission has been received within a predetermined time G6 since the last time the periodic response transmission from the sub units B to D was received. On the other hand, the sub-units B to D determine whether or not a radio wave abnormality has occurred depending on whether or not the next periodic transmission has been received within a predetermined time G7 since the previous periodic transmission from the parent unit A was received. Judging. The predetermined times G6 and G7 are longer than the predetermined time G5, which is the regular transmission cycle of the parent device A, and can be, for example, about three times the predetermined time G5.

[Operation when a fire is detected]
Next, an outline of operation when a fire occurs in the monitoring area of the alarm system 200 during fire monitoring (steady state) will be described.

  First, the transmission / reception operation of the interlocking signal when the master unit detects a fire will be described with reference to FIG. When a fire occurs in the environment where the parent device A is installed, the parent device A detects the fire by the fire detection circuit 7, and controls the alarm sound control circuit 8 and the indicator light circuit 9 to fire alarm by sound or indicator light. To do.

  Next, during the carrier sense period C, the parent device A performs carrier sense before transmission (shown as “CS” in FIG. 5). If a carrier of a predetermined level or higher is not detected by this carrier sense, the interlock signal transmission process is started. Specifically, the transmission circuit 51 broadcasts information related to fire detection to the other fire alarm devices B to D (child devices B to D) as interlocking signals. At this time, the transmission of the interlocking signal is performed for one block, and then, for example, an inter-block pause period M2 of 2 seconds is set, and then the interlocking signal is transmitted again (retransmission) for one block. As described above, when the parent device A detects a fire, it transmits a total of two blocks of interlocking signals. When parent device A detects a fire, transmission of the interlocking transfer signal (transfer of the interlocking signal) is not performed. Therefore, when the master unit A transmits the interlocking signal for two blocks, the slave units B to D are interlocked. Increases the probability of receiving signals.

  On the other hand, the subunits B to D perform the intermittent reception operation at each intermittent reception interval Ts as described above. When the interlock signal is received by this intermittent reception operation, the alarm sound control circuit 8 and the indicator lamp circuit 9 are controlled to perform an interlock alarm by voice or indicator lamp.

  After that, when the master unit A no longer detects a fire, it self-recovers and stops the alarm, and transmits a recovery signal to the other slave units B to D. The restoration signal is transmitted for a total of two blocks in the same manner as the interlock signal. Then, the other slave units (fire alarm devices B to D) that have received the recovery signal also stop the alarm.

  Here, since the inter-block pause period M2 is set shorter than the carrier sense period C, even if the other fire alarms B to D detect a fire, the base unit A is detected by the carrier sense before transmission. Since the carrier of the interlocking signal transmitted from is detected, the interlocking signal or the like is not transmitted during the inter-block pause period M2, and the information delay can be reduced while avoiding a collision.

  Next, the transmission / reception operation of the interlocking signal when the slave detects a fire will be described with reference to FIG. Here, the case where the subunit | mobile_unit B detects a fire is demonstrated as an example. When a fire occurs in the environment where the child unit B is installed, the child unit B detects the fire by the fire detection circuit 7 and controls the alarm sound control circuit 8 and the indicator light circuit 9 to fire alarm by sound or indicator light. To do.

  Next, handset B performs carrier sense before transmission during carrier sense period C (shown as “CS” in FIG. 6). If a carrier of a predetermined level or higher is not detected by this carrier sense, the interlock signal transmission process is started. Specifically, the transmission circuit 51 broadcasts information related to fire detection to other fire alarm devices A, C, D (master device A, slave devices C, D) as interlocking signals. At this time, transmission of the interlocking signal is performed for one block, and then an inter-block pause period M1 of the same time as the transmission period N2 of the interlocking transfer signal transmitted from the parent device A is set. 1 block). As described above, when the slave unit B detects a fire, it performs a total of two blocks of transmission of interlocking signals, thereby increasing the probability that the master unit A, the slave units C and D receive the interlocking signal.

  When the transmission of the first block is completed, the control circuit 1 of the slave unit B activates the reception circuit 52 to receive the transfer signal from the master unit A during the transfer confirmation period J. Try. When a transfer signal is received from the parent device A, an inter-block pause period M1 is set after the end of transmission of the transfer signal, and then one block of interlocking signal transmission (retransmission) is performed again. This transfer confirmation period J is a predetermined time set individually for all the sub-units B to D, for example, a predetermined time randomly generated based on the addresses, serial numbers, etc. of the sub-units B to D. . Here, the transfer confirmation period J is longer than the inter-block pause period M2 and shorter than the carrier sense period C, and is set, for example, between 2 and 4 seconds.

  On the other hand, the parent device A performs an intermittent reception operation at each intermittent reception interval Ts as described above. When the interlock signal is received by this intermittent reception operation, the alarm sound control circuit 8 and the indicator lamp circuit 9 are controlled to perform an interlock alarm by voice or indicator lamp. In addition, when the master unit A receives the interlock signal transmitted from the slave unit B, the master unit A transmits the interlock transfer signal to all the slave units B to D for the purpose of transferring the interlock signal after the transmission of the interlock signal. To do. As shown in FIG. 6, the transmission of the interlocking transfer signal is performed following the transmission of the interlocking signal of each block. As described above, the master unit A performs transmission of the interlocking transfer signal for a total of two blocks, thereby increasing the probability that the slave units B to D receive the interlocking transfer signal.

  Similar to the master unit A, the slave units C and D perform the intermittent reception operation at the intermittent reception interval Ts as described above. When the interlock signal or the interlock transfer signal is received in this intermittent reception operation, the alarm sound control circuit 8 and the indicator lamp circuit 9 are controlled to issue an interlock alarm by voice or indicator lamp.

  Thereafter, when the slave unit B no longer detects a fire, it self-recovers and stops the alarm, and transmits a recovery signal to the other alarm units (master unit A, slave units C and D). When receiving the recovery signal, the master unit A transmits a recovery transfer signal to all the slave units B to D. The recovery signal and the recovery transfer signal are transmitted in two blocks each in the same timing chart as the transmission of the interlock signal and the interlock transfer signal shown in FIG. Then, the other alarm devices (parent device A, child devices C and D) that have received the recovery signal also stop the alarm.

  In addition, when the master unit A receives the interlocking signal in the intermittent reception operation, the master unit A transmits the interlocking transfer signal after the end of the transmission of the interlocking signal. This will be briefly described below.

  For example, in the transmission process of one block, the transmission period Tx1 = 3 seconds, the transmission period Tx2 = 2.5 seconds, the transmission period Tx3 = 3 seconds, the transmission suspension period ST1 = 2 seconds, and the transmission suspension period ST2 = 2 seconds are set. , Tx1 and Tx3 each include 28 frames, and Tx2 includes 24 frames. In this case, a unique frame counter value indicated by numbers “80” to “1”, for example, is added to each transmission frame.

  Then, when receiving the interlock signal from the slave unit B in the intermittent reception process, the master unit A obtains the signal transmission start timing from the frame counter value included in the received interlock signal by a predetermined arithmetic expression. The signal transmission start timing is the length of the transfer standby period K shown in FIG. Here, the master unit A starts the transmission process of the interlocked transfer signal when the transfer standby period K has elapsed after receiving the interlocking signal from the slave unit B, that is, when the transfer start timing comes. Note that the transfer timing may be determined based on a transfer start timing table instead of obtaining the transfer start timing from a frame counter value included in the received interlocking signal by a predetermined arithmetic expression. In addition, when the interlock signal from the slave unit B is received in the intermittent reception process, the reception operation may be continued and it may be confirmed that the transmission of the interlock signal is completed.

  As described above, in the example of FIG. 6, the interlock signal from the slave unit B that detects the fire and the interlock transfer signal from the master unit A are alternately transmitted, so that the master unit A and the slave unit B that detects the fire are detected. The other sub-units C and D can receive the interlocking signal or the interlocking transfer signal, drive the alarm sound control circuit 8 and the indicator lamp circuit 9, and can report the abnormality in the entire system. The re-transmission of the interlocking signal and the interlocking transfer signal may not be performed once but may be performed a plurality of times.

  FIG. 7 is a diagram for explaining a case where the master unit cannot receive the interlocking signal in FIG. As described with reference to FIG. 6, when the slave unit B completes transmission of the first block of the interlock signal, the control circuit 1 of the slave unit B activates the reception circuit 52 and performs the master unit during the transfer confirmation period J. Attempt to receive a linked transfer signal from A. At this time, if the interlock transfer signal from the parent device A cannot be received, the interlock signal is transmitted again without waiting for the inter-block pause period M1 from the end of the interlock signal transmission. The subsequent time charts are the same as those in FIG. As described above, in the example of FIG. 7, the other alarm devices (parent device A, child devices C and D) can quickly receive the interlocking signal and the interlocking transfer signal.

  FIG. 8 is a diagram illustrating a case where a plurality of slave units simultaneously transmit interlocking signals. In the example of FIG. 8, the slave unit B and the slave unit C detect the fire and transmit the interlock signal at the same time. In this case, the slave unit B and the slave unit C transmit the interlock signal at the same time. The other alarm devices (parent device A, child device D) cannot receive signals accurately due to collision of signals, and therefore, the parent device A cannot transmit the interlocking transfer signal.

  At this time, the slave unit B and the slave unit C cannot receive the interlocked transfer signal from the master unit A in the transfer confirmation period J after the transmission of the first block of the interlock signal is completed. Here, as described above, the transfer confirmation period J is set individually for each of the slave units B to D. In the example of FIG. 8, the transfer confirmation period J of the slave unit B is more than the transfer confirmation period of the slave unit C. Also short. Therefore, when the interlock signal is transmitted again, the slave unit B having the short transfer confirmation period J out of the slave units B and C in which the abnormality is detected is transmitted from the slave unit C having the long transfer confirmation period J. Since no carrier is detected during the transfer confirmation period J, the interlock signal is transmitted. On the other hand, the slave unit C having the long transfer confirmation period J receives the interlock signal from the slave unit B having the short transfer confirmation period J. Since the carrier is detected by carrier detection during the transfer confirmation period J, the interlock signal is not transmitted, and therefore, the interlock signal is transmitted only from one slave unit B, so that no signal collision occurs. Therefore, the other alarm devices A and D (including the child device C) can reliably receive the interlocking signal. In addition, the subunit | mobile_unit C does not prevent a series of transmission of the interlocking signal and interlocking transfer signal by the said subunit | mobile_unit B by performing the carrier detection of the carrier sense period C before transmitting an interlocking signal again. Can be. In FIG. 7, the subsequent time charts are the same as those in FIG.

  Although not shown in FIG. 8, assuming that the master unit A and the slave units B and C simultaneously transmit the interlocking signal, the master unit A and the slave units B and C detect the abnormality at the same time. When the interlocking signal is transmitted, the signals collide with each other, so it is considered that the other alarm devices (slave units D) cannot receive the interlocking signal. Here, since the inter-block pause period M2 of the master unit A is set shorter than the transfer confirmation period J of the slave units B and C, when the interlocking signal is transmitted again, the alarm device that has detected an abnormality. Among A, B, and C, the master unit A transmits the interlock signal without transmitting the interlock signal from the slave units B and C during the transfer confirmation period J, while the slave units B and C Since the interlock signal is transmitted from the device A and the carrier is detected by the carrier detection during the transfer confirmation period J, the interlock signal is not transmitted. Therefore, the interlock signal is transmitted only from the parent device A, so that a signal collision occurs. Absent. Therefore, the other alarm devices B to D can receive the interlock signal from the parent device A. Thereby, the signal from the parent device A can be received due to the arrangement, but the child device D that cannot receive the interlocking signal from the child devices B and C that detect the abnormality (for example, the child device D is a hidden terminal). Is present, the slave unit can receive the interlocking signal and drive the alarm sound control circuit 8 and the indicator lamp circuit 9, and can report the abnormality in the entire system.

  As described above, the alarm system 200 in the present embodiment includes the state detection unit 7 (fire detection circuit 7) that detects an abnormality in the installation environment, the transmission / reception unit 5 that transmits and receives radio signals, and the state detection unit 7. A plurality of notifying units 8 and 9 (alarm sound control circuit 8 and indicator lamp circuit 9) for notifying that an abnormality in the installation environment has been detected, and a control unit 1 for controlling the transmitting / receiving unit 5 and the notifying units 8 and 9 are provided. Alarm device 100, one of the plurality of alarm devices 100 as a parent alarm device A, and the other alarm devices as child alarm devices B to D, wireless signals are transmitted between the plurality of alarm devices 100. In the alarm system 200 for transmitting and receiving, the parent alarm device A is arranged in a region where the transmission ranges of all the radio signals of the plurality of child alarm devices B to D overlap, and the transmission / reception unit 5 of the parent alarm device A includes a plurality of Sending radio signals to all child alarms B to D Within the range, periodic monitoring is performed by periodically transmitting and receiving radio signals between the parent alarm device A and the child alarm devices B to D, and the control unit 1 of the child alarm devices B to D When the state detection unit 7 detects an abnormality, in order to drive the notification means 8 and 9 of all the other alarm devices 100, an interlock signal for notifying the occurrence of the abnormality is sent from the transmission / reception unit 5 to all other alarm devices. When the control unit 1 of the parent alarm device A receives the interlock signal transmitted from the child alarm devices B to D, the notification means 8 of all the other child alarm devices B to D are transmitted. , 9, the interlock transfer signal is transmitted to all the other child alarm devices B to D, and the control unit 1 of the child alarm devices B to D that transmitted the interlock signal transmits the interlock transfer signal. When the transmission period elapses, the interlocking signal is sent from the transmitting / receiving unit 5 to all other alarm devices 1. Since all the other alarm devices 100 receive the interlocking signal or the interlocking transfer signal transmitted alternately, the alarm means 8 and 9 can be driven, In the alarm system 200 having the parent alarm device A and the child alarm devices B to D, an abnormality can be notified throughout the system.

  The control unit 1 of the parent alarm device A that has transmitted the interlock transfer signal transmits the interlock transfer signal from the transmission / reception unit 5 to all other child alarm devices after the retransmit period of the interlock signal ends. Since all of the other alarm devices 100 receive the interlocking signal or the interlocking transfer signal transmitted alternately, they can drive the notification means 8 and 9 because they are retransmitted to B to D. In the alarm system 200 having the parent alarm device A and the child alarm devices B to D, the abnormality can be notified throughout the system.

  The control unit 1 of the child alarm devices B to D that transmitted the interlock signal provides a transfer confirmation period J for a predetermined time after the transmission of the interlock signal, and the parent alarm within the transfer confirmation period J. When the interlocking transfer signal transmitted from the device A cannot be received, the interlocking signal is sent again from the transmitting / receiving unit 5 to all other alarm devices without waiting for the transmission period of the interlocking transfer signal to elapse. Since the other alarm device 100 is to be transmitted to 100, it can receive the interlocking signal and the interlocking transfer signal early.

  The transfer confirmation period J is a predetermined time set individually for all the child alarm devices B to D, and the control unit 1 of the child alarm devices B to D When the carrier function is detected by activating the reception function and the carrier is detected during the transfer confirmation period J, the interlocking signal is not transmitted from the transmission / reception unit 5. When a plurality of child alarm devices B to D detect an abnormality at the same time and transmit an interlocking signal, the signals collide with each other, so that the other alarm devices 100 cannot receive the interlocking signal. However, when the interlock signal is transmitted again, among the child alarm devices B to D in which the abnormality is detected, the child alarm devices B to D with the short transfer confirmation period J are the alarm devices B with the long transfer confirmation period J. No interlock signal is transmitted from ~ D, and no carrier is detected during the transfer confirmation period J, so that the interlock signal is transmitted, while the child alarm devices B to D having the long transfer confirmation period J have the transfer confirmation period J Since the interlock signal is transmitted from the short child alarm devices B to D and the carrier is detected by the carrier detection during the transfer confirmation period J, the interlock signal is not transmitted, so the interlock signal is transmitted from one of the alarm devices B to D. Signal transmission, so no signal collision occurs. Therefore, the other alarm devices 100 can reliably receive the interlocking signal.

  In addition, when the state detection unit 7 detects an abnormality, the control unit 1 of the parent alarm device A generates an abnormality in order to drive the notification means 8 and 9 of all the other child alarm devices B to D. The interlocking signal to be notified is transmitted from the transmission / reception unit 5 to all the other child alarm devices B to D, and after the transmission of the interlocking signal is finished and a pause period M2 of a predetermined time has elapsed, the interlocking signal is transmitted. Are retransmitted from the transmitter / receiver 5 to all the other child alarm devices B to D, and the suspension period M2 is set to a predetermined time shorter than the transfer confirmation period J. When the parent alarm device A and the child alarm devices B to D detect the abnormality at the same time and transmit the interlock signal, the signals collide with each other, so that the other alarm devices 100 cannot receive the interlock signal. It is done. However, when transmitting the interlock signal again, among the alarm devices 100 that have detected the abnormality, the master alarm device A has not received the interlock signal from the child alarm devices B to D during the transfer confirmation period J. On the other hand, the child alarm devices B to D do not transmit the interlock signal because the interlock signal is transmitted from the master alarm device A and the carrier is detected by the carrier detection during the transfer confirmation period J. Therefore, since the interlock signal is transmitted only from the parent alarm device A, no signal collision occurs. Therefore, the other alarm device 100 can receive the interlocking signal from the parent alarm device A. Thereby, the signal transmitted from the parent device A can be received in relation to the arrangement, but the slave alarm devices B to D (hidden terminals) that cannot receive the interlocking signals transmitted from the child alarm devices B to D that detect the abnormality. When the alarm is present, the child alarm devices B to D (hidden terminals) can receive the interlock signal and drive the notification means 8 and 9, and can notify the abnormality in the entire system.

  In addition, the control unit 1 of the alarm device 100 activates the reception function of the transmission / reception unit 5 for carrier detection period C for a predetermined time before starting transmission of the radio signal from the transmission / reception unit 5 to perform carrier detection. If the carrier is not detected during the carrier sense period C, the wireless signal is transmitted from the transmission / reception unit 5, and the carrier sense period C is a predetermined period longer than the pause period M2 and the transfer confirmation period J. Since the time is set, the interlock signal from the alarm device 100 that needs to transmit the interlock signal again has priority over the interlock signal from the alarm device 100 that needs to transmit the interlock signal for the first time. Therefore, information delay can be reduced while avoiding collision.

  In addition, the re-transmission of the interlocking signal and the interlocking transfer signal is performed a plurality of times, and at this time, the interlocking signal and the interlocking transfer signal are alternately retransmitted. be able to.

  The interlock signal is a signal having a predetermined transmission pattern including a transmission period in which the signal is repeatedly transmitted, and the predetermined transmission pattern includes the transmission period and a transmission suspension period in which transmission of the interlock signal is suspended. Since this is repeatedly executed alternately, the other alarm devices 100 can receive the interlocking signal transmitted by the alarm device 100.

  Further, since the control unit 1 of the alarm devices B to D does not perform signal reception processing during the transmission suspension period, power consumption can be reduced.

  In the above embodiment, the interlocking signal and the interlocking transfer signal are alternately transmitted once each. However, the interlocking signal and the interlocking transfer signal are not limited to once. It is good.

  In the above description, the case where the present invention is applied to a fire alarm device that is driven by a battery and performs wireless communication has been described as an example, but the power supply method and communication method of the fire alarm device are not limited, In addition to fire alarms, it can also be applied to alarms for detecting abnormalities. Moreover, you may use for the receiver and detector of an automatic fire alarm system.

  DESCRIPTION OF SYMBOLS 1 Control circuit, 2 Battery, 3 Power supply circuit, 4 Battery voltage detection circuit, 5 Transmission / reception circuit, 6 Antenna, 7 Fire detection circuit, 8 Alarm sound control circuit, 9 Indicator light circuit, 11 Memory element, 51 Transmission circuit, 52 Reception Circuit, 100 fire alarm, 200 alarm system, C carrier sense period, J transfer confirmation period, K transfer waiting period, M1 block pause period, M2 block pause period, N1 interlock signal transmission period, N2 interlock transfer signal transmission period .

Claims (2)

When detecting an abnormality in the state detection unit for detecting an abnormality in the installation environment, a transmission / reception unit for transmitting and receiving radio signals, an informing means for notifying that the abnormality in the installation environment is detected by the state detection unit, and the state detection unit A plurality of alarm devices including a control unit that drives the notification unit and transmits an interlocking signal for notifying the occurrence of an abnormality from the transmission / reception unit in order to drive the notification unit of all other alarm devices. In an alarm system for transmitting and receiving radio signals between the plurality of alarm devices, and notifying an abnormality in all alarm devices when any state detection unit of the alarm device detects an abnormality,
A hierarchy is provided for the plurality of alarm devices, and the upper alarm device is arranged in an area where radio signals can be transmitted and received with all lower alarm devices belonging to the immediate lower layer ,
The control unit of the alarm device of the upper receives the interlock signal, the transfer in order to drive the alarm all notifying means of the lower, the interlocking signal from said transceiver unit relative to the lower alarm all Let
The lower alarm is
A predetermined time set to individual values different from each other, and having a transfer confirmation period for trying to receive the transferred interlocking signal after transmitting the interlocking signal,
After transmitting the interlock signal, when it can not receive the transferred interlocking signal in the transfer confirmation period, the control unit is resend the interlocking signal obtained by transmission from the transceiver unit,
Further, when the higher-order alarm device that has transmitted the interlocking signal has completed transmission of the interlocking signal, a pause period that is set to a predetermined time shorter than the transfer confirmation period of all the lower-order alarm devices has elapsed. And then retransmitting the interlocking signal from the transmission / reception unit . When detecting an abnormality in the state detection unit for detecting an abnormality in the installation environment, a transmission / reception unit for transmitting and receiving radio signals, an informing means for notifying that the abnormality in the installation environment is detected by the state detection unit, and the state detection unit A plurality of alarm devices including a control unit that drives the notification unit and transmits an interlocking signal for notifying the occurrence of an abnormality from the transmission / reception unit in order to drive the notification unit of all other alarm devices. In an alarm system for transmitting and receiving radio signals between the plurality of alarm devices, and notifying an abnormality in all alarm devices when any state detection unit of the alarm device detects an abnormality,
A hierarchy is provided for the plurality of alarm devices, and the upper alarm device is arranged in an area where radio signals can be transmitted and received with all lower alarm devices belonging to the immediate lower layer ,
The lower alarm device, after the transmission of the interlock signal, after the first pause period has elapsed, the control unit retransmits the interlock signal from the transceiver unit,
The control unit of the upper alarm device is
When the state detection unit detects an abnormality, the interlocking signal is transmitted from the transmission / reception unit, and further, the transmission ends, and the second suspension period shorter than the first suspension period elapses, and is retransmitted.
When the state detection unit does not detect an abnormality, when receiving the interlock signal transmitted from the lower alarm device, the interlock signal is transmitted from the transceiver unit to the lower alarm all,
The lower alarm is
A predetermined time that is shorter than the first suspension period, longer than the second suspension period, and set to different values for each of the lower-order alarm devices, and is transferred after transmitting the interlocking signal. when unable to receive the transferred interlocking signal to the receive transfer confirmation period Ru attempts interlocking signals, without waiting for the elapse of the first idle period, thereby retransmitting the interlock signal transmitted from the transceiver unit An alarm system featuring.

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