JP2006126920A - Monitoring system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a monitoring system available for caring an aged person, or the like by an inexpensive and simple device, and to provide the system of easy operation and high practicality. <P>SOLUTION: A portable master unit 1 for selecting specific tag ID, and for transmitting/receiving an electric wave signal is set at a predetermined location, and a portable slave unit 2 for transmitting/receiving an electric wave signal(response signal) in response to the electric wave signal received from the master unit 1 is mounted on an object to be monitored, and the receiving status of the electric wave signal from the slave unit 2 is displayed or outputted with a sound in a monitor mode. Thus, it is possible to monitor the entry of an object to be monitored to a predetermined region, and to search the object to be monitored by gradually weakening electric wave strength from electric wave strength which is stronger than electric wave strength in a normal time in the monitor mode while moving the master unit 1 in a search mode. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a monitoring system and a monitoring method for monitoring a person such as an elderly person or a patient, or a predetermined article.

  With recent aging, various techniques for reducing the burden on caregivers have been developed. In particular, there is a technique disclosed in, for example, Patent Document 1 as a technique for monitoring the behavior of a care recipient and preventing wrinkles of a dementia patient or the like or early detection.

  In the technique disclosed in Patent Document 1, a radio wave generation source attached to a human body or an object, a position specifying device that specifies the position of the human body or an object from the intensity or direction of the radio wave, an infrared sensor, a distance sensor, Build a house with radio wave receiving means for receiving radio waves from various sensors such as acceleration sensors and RF-ID mats, collect sensor information from each sensor at the base station, and integrate these informations into the human body Behavior information such as posture, movement, body movement, behavior, activity state, etc. is stored in the data storage means, compared and evaluated to determine abnormalities in human body behavior, and reported to the person or another person.

According to the technique disclosed in Patent Document 1, information in each room can be shared through a network, and the behavioral state of each individual in all rooms can be grasped, greatly reducing the burden on the caregiver. can do.
JP 2002-149824 A

  However, since the technique disclosed in Patent Document 1 described above is a large-scale system in which a large number of various sensors are arranged in each room, and collected and integrated in a base station through a network, the apparatus becomes complicated and operation is performed. However, there is a problem that the equipment cost becomes excessive and the system operation / maintenance costs increase. For this reason, it is difficult to install this system in ordinary homes and the like, and there is a fear that it is not practical.

  Therefore, the present invention has been made in view of the above points, and realizes a monitoring system and a monitoring method that are easy to operate and highly practical while realizing a monitoring system that can be used for elderly care and the like with an inexpensive and simple device. The issue is to provide

  In order to solve the above-described problems, the present invention sets a base unit that is portable and transmits / receives a radio wave signal at a predetermined position when detecting the position of the monitoring object, and is portable and received from the base unit. Depending on the radio signal, a slave unit that transmits the radio signal to the master unit is attached to the monitored object, and the reception status of the radio signal from the slave unit is displayed or acoustically output in the monitoring mode of the master unit, thereby providing a predetermined Stronger than the normal radio field intensity in the monitoring mode according to the reception state of the radio signal from the slave unit while monitoring the entry of the monitoring object into the area and moving the master unit in the search mode in the master unit The radio wave signal is transmitted using the radio wave intensity, and the monitoring target is searched for by displaying or acoustically outputting the reception state of the radio wave signal.

  In the above invention, in the search mode, when the radio signal from the slave unit can be received, the transmission radio field strength is reduced. When the radio signal from the slave unit cannot be received, the transmission radio field strength is increased. It is preferable to transmit a radio signal with a transmission pattern that follows.

  In the above-described invention, in the monitoring mode, a transmission pattern that periodically transmits a radio signal having a radio field strength stronger than a normal radio field strength is used to check a location in the transmission / reception area of the slave unit based on a reception signal from the slave unit. It is preferable to do.

  In the above invention, it is preferable that a radio signal is transmitted from the master unit in the call mode of the master unit, and predetermined display or sound output is executed on the slave unit side in accordance with the transmitted radio signal.

  In the above invention, it is preferable that the display of the reception state or the sound output in the master unit is performed remotely by a portable reporting slave unit.

  As described above, according to the present invention, in the monitoring mode, a radio signal having a weak radio wave intensity is transmitted from the parent device, and the monitoring target is monitored to enter a predetermined area (transmission / reception area having a weak radio wave intensity). it can. For example, it is possible to monitor the passage of a monitoring object (person or object) to which a child device is attached by setting the parent device at an entrance or the like. This approach (passage) of the monitoring object can be notified to a caregiver or the like by the lighting display of the LED or the sound output of the warning sound in the parent device or the reporting child device.

  On the other hand, in the search mode, it is possible to expand the range of radio wave transmission / reception with respect to the slave unit by moving the master unit to a radio field strength (for example, maximum output strength) stronger than the normal radio field strength in the monitoring mode. Also, when the radio signal from the handset can be received, the transmission radio wave strength is reduced. When the radio signal from the handset cannot be received, the transmission pattern increases the transmission radio wave strength. By changing the radio wave intensity step by step, it is possible to narrow down while adjusting the search range and to specify the position of the monitoring object.

  In the present invention, if a plurality of slave units are provided, each slave unit is identified by a unique tag ID, and an arbitrary slave unit is selected from the plurality of slave units to transmit and receive radio signals. A single master unit can monitor a plurality of slave units collectively.

  In the monitoring mode according to the present invention, if the location of the slave unit is confirmed by a transmission pattern that periodically transmits a radio signal having a radio field strength stronger than the normal radio field strength, the monitoring in a predetermined area can be performed. The number of slave units that are monitored and the power on / off status can be ascertained.

  In the calling mode in the above invention, if a radio signal is transmitted from the parent device and the child device is called, the search can be performed even when the monitoring target is hidden or lost.

  Further, in the present invention, if the reception status display or sound output in the master unit is remotely performed by a portable reporting slave unit, monitoring is performed even if the caregiver is away from the master unit. be able to. Note that the present invention can also be used as a calling device such as a nurse call by providing a function for calling a notification slave unit from a slave unit on the monitoring target side.

  As a result, according to the present invention, a monitoring system that can be used for elderly care and the like can be realized by an inexpensive and simple device, and a system that is easy to operate and highly practical can be provided.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of a monitoring system according to the present embodiment.

(Overall system configuration)
As shown in the figure, the monitoring system according to the present embodiment is a system for detecting the position of a monitoring target object such as an elderly person or a patient, or a valuable object such as a wallet or a bankbook. Therefore, the mobile phone includes a master device 1, a plurality of slave devices 2 (2a, 2b,.

  The master unit 1 is portable and selects a tag ID unique to each slave unit, and transmits and receives radio signals to and from any slave unit 2 (2a, 2b ...). This is a transmission / reception device that displays or acoustically outputs the reception status of radio signals for each selected tag ID (slave unit), and transmits radio signals such as response requests and ringing start information / ringing stop information to the selected unit 2 At the same time, a response signal from the slave unit is received, and the LED indicator lamp is changed according to the received signal.

  Specifically, the base unit 1 includes mode display LEDs 1a to 1c, a mode selection button 1d, an LED 1e for displaying the status of each slave unit, a tag selection button 1f for selecting a tag (slave unit), A power supply LED 1h indicating the state of the power supply and a switch 1g for operating start and stop of the master unit 1 are provided.

  The tag selection button 1f is an operation button for selecting a slave unit to be communicated. By pressing this button, the tag ID of the slave unit is arbitrarily switched. The mode selection button 1d is a button for switching between the monitoring mode, the search mode, and the calling mode, and the radio wave transmission / reception pattern can be switched by pressing this button.

  FIG. 2 is an explanatory diagram showing radio wave transmission patterns in each mode in the base unit 1. First, in the monitoring mode, it is a transmission pattern that switches between normal time and slave unit confirmation. At this normal time, as shown in FIG. Communicate. Then, when the slave unit is checked periodically, as shown in FIG. 5B, communication is performed with a strength stronger than the normal radio wave strength (in this embodiment, the strongest radio wave transmission strength), and the transmission / reception area ( It is preferable to use a transmission pattern for confirming that the user is within the area (solid line portion in the figure).

  On the other hand, in the search mode, the radio wave signal is transmitted using a radio wave intensity stronger than the normal radio wave intensity in the monitoring mode according to the reception state of the radio wave signal from the slave unit 2. Specifically, as shown in FIG. 5C, in the search mode, when the radio signal from the slave unit 2 can be received, the transmission radio wave intensity is reduced to reduce the radio signal from the slave unit. When cannot be received, the radio signal is transmitted with a transmission pattern in which the transmission radio wave intensity is increased.

  Further, in the calling mode, as shown in FIG. 5B, a radio wave signal is transmitted with the maximum output, and a predetermined display or sound output is executed on the handset 2 side.

  The subunit | mobile_unit 2 is an apparatus attached to the elderly person, valuables, etc. which are monitored, and is the radio | wireless communication which transmits / receives a radio signal with respect to the main | base station 1 according to the radio signal received from the main | base station 1 which is portable. It has a function.

  Specifically, in this embodiment, the subunit | mobile_unit 2 is a small radio | wireless tag, and while having a unique ID number assigned to each unit, it has an LED display, a sound output, and a vibration device for vibration. Then, by using a tag ID unique to each machine, a response signal is transmitted in response to a response request from the parent machine 1, ringing start information is received and LED lighting or ringing is started, or ringing is stopped by ringing stop information Etc.

  The reporting slave unit 3 is, for example, a terminal device carried by a caregiver such as an elderly family member or a helper. Although the basic configuration is the same as that of the slave unit 2 described above, the reception status display in the master unit 1 is performed. Alternatively, it has a function of remotely outputting sound.

(Internal configuration of each device)
Next, the internal configuration of the above-described parent device 1 and child device 2 (reporting child device 3) will be described. FIG. 3 is a block diagram showing an internal configuration of each machine, and FIG. 4 is a functional block diagram of a microcontroller of each machine.

  As shown in FIG. 3A, the base unit 1 includes a wireless unit 11, a control unit 12, a display unit 13, and a power supply unit 14.

  The wireless unit 11 includes a BPF 111 that transmits and receives radio waves via an antenna, a switch 112 that switches input and output of transmission signals and reception signals, an interface 118 that inputs and outputs data between the control unit 12, and a transmission system It includes a modulator 115, which is a circuit, a transmission circuit 114, a power amplifier 113, and a demodulator 117, which is a circuit of a reception system, and a reception circuit 116.

  The control unit 12 includes a microcontroller 121 and ROM 122 and RAM 123 which are memories. The microcontroller 121 is an arithmetic processing unit, executes programs stored in the ROM 122 and RAM 123 to perform various functions, and reads / writes data from / to each memory. The ROM 122 stores tag ID settings for each slave unit.

  The display unit 13 is connected to a buzzer 131 that outputs sound, display means such as an LED, and an interface 133 for the various switches described above.

  The power supply unit 14 includes a power supply device 141 that is connected to a battery or an AC adapter and supplies power.

  As shown in FIG. 4A, the functions executed by the microcontroller 121 of the master unit 1 are an external interface 121a, a signal detection unit 121b, an output control unit 121c, a radio wave intensity control unit 121d, and a tag. An ID selection unit 121e, an input interface 121f, a mode switching unit 121i, a signal generation unit 121g, and a memory control unit 121h are included.

  The external interface 121a is a module that transmits and receives data to and from the interface 118 of the wireless unit 11. The received signal is output to the signal detection unit 121b, and the signal input from the radio wave intensity control unit 121d is the wireless unit. 11 is sent out.

  The signal detection unit 121b is a module that determines which slave unit the signal received by the wireless unit 11 is from. Specifically, the signal detection unit 121b performs determination based on a tag ID included in the received signal. This determination result is input to the output control unit 121c.

The output control unit 121c is connected to the display unit 13, and controls the lighting color and blinking of the mode LEDs 1a to 1c and the tag display LED 1e and the buzzer sound through the display unit 13. The operation specifications of each LED are as follows.

The operation specifications of the buzzer (speaker) of the base unit 1 are as follows.

  Further, the output control unit 121c is connected to the radio wave intensity control unit 121d and the tag ID selection unit 121e, and in which signal strength is transmitted to which slave unit (tag ID) in the search mode. Accordingly, a function of changing the blinking speed of the LED 1e is provided. In the present embodiment, when the signal strength is strong, it blinks slowly (at a long interval), and when the signal strength is weak, it blinks quickly (at a short interval). As a result, when the search target is near, it blinks quickly, and when it is far away, it blinks slowly.

  The input interface 121f is a module that is connected to each switch and switches a mode of the mode switching unit 121i or a tag ID of the tag ID selection unit 121e by a user operation.

  The mode switching unit 121i is a module that switches the type of transmission signal (ringing start information, ringing stop information, etc.) and the change pattern of the intensity of the transmission radio wave, and the signal generation unit 121g responds to an instruction from the mode switching unit 121i This is a module that reads information data from each memory through the memory control unit 121h and generates a predetermined signal.

  The tag ID selection unit 121e is a module that sets tag IDs (1 to 9) of slave units to be communicated in response to an instruction from the input interface 121f. The tag ID selection unit 121e can also select a group ID for making a response request to a group composed of a plurality of arbitrary slave units. The radio wave intensity control unit 121d is a module that sets the transmission power level of the transmission radio wave according to the instruction of the mode switching unit 121i and controls the operation of the power amplifier 113 of the radio unit 11 through the external interface 121a. Specifically, in the monitoring mode, the maximum is set in the slave unit confirmation process, and the minimum level is set in the normal process. In the search mode, the transmission power level is started from the maximum, and the transmission power level is sequentially lowered every time the response signal from the slave unit is confirmed n times continuously. Further, when the response signal from the small tag cannot be confirmed n times continuously at a specific transmission power level, the transmission power level is sequentially increased.

  On the other hand, the subunit | mobile_unit 2 (reporting subunit | mobile_unit 3) is provided with the radio | wireless part 21, the control part 22, the display part 23, and the power supply part 24, as shown in FIG.3 (b).

  The radio unit 21 includes a BPF 211 that transmits and receives radio waves via an antenna, a switch 212 that switches input and output of transmission signals and reception signals, an interface 218 that inputs and outputs data between the control unit 22, and a transmission system It includes a modulator 215 that is a circuit, a transmission circuit 214, a power amplifier 213, and a demodulator 217 and a reception circuit 216 that are circuits of a reception system.

  The control unit 22 includes a microcontroller 221 and ROM 222 and RAM 223 that are memories. The microcontroller 221 is an arithmetic processing unit, executes programs stored in the ROM 222 and RAM 223 to perform various functions, and reads / writes data from / to each memory. The ROM 222 stores its own tag ID setting and the like.

  A buzzer 231 and a vibrator (not shown) for outputting sound are connected to the display unit 23. The power supply unit 24 includes a power supply device 241 that is connected to a battery or an AC adapter and supplies power.

  As shown in FIG. 4B, the functions executed by the microcontroller 221 of the slave unit 2 are an external interface 221a, a signal detection unit 221b, an output control unit 221c, a signal generation unit 221d, and a memory control. A unit 221e and a battery monitoring unit 221f are included.

  The external interface 221a is a module that transmits and receives data to and from the interface 218 of the wireless unit 21, and the received signal is output to the signal detection unit 221b, and the signal input from the signal generation unit 221d is the wireless unit 21. Sent to the.

  The signal detection unit 221b is a module that determines whether the signal received by the wireless unit 21 is directed to the own device. Specifically, the signal detection unit 221b performs determination based on a tag ID included in the received signal. The signal detection unit 221b also has a function of detecting a group ID that is collectively transmitted to a group to which the own device belongs. These determination results are input to the output control unit 221c. The output control unit 221 c is connected to the display unit 23 and controls the buzzer sounding through the display unit 23.

  The signal generation unit 221d is a module that reads information data from each memory through the memory control unit 221e and generates a predetermined signal. The generated signal is transmitted from the wireless unit 21 through the external interface 221a.

  The battery monitoring unit 221f is connected to the power supply unit 24. The battery monitoring unit 221f measures the voltage of the power supply unit 24, and notifies the signal generation unit 221d of “low battery” when the voltage is decreasing. The signal generation unit 221d generates a signal for informing the low battery, and notifies the base unit 1 through the wireless unit 21.

(Method)
By operating the monitoring system having the above configuration, the monitoring method of the present invention can be implemented. FIG. 5 is a flowchart showing the operation of the monitoring system according to the present embodiment.

○ Monitoring mode Explains the monitoring mode. Here, a case will be described as an example in which the care recipient is monitored and notified that he or she is going out of the entrance lamp.

  First, the child device 2 is attached to the care recipient, and the care worker wears the notification child device 3. Further, the base unit 1 is installed at the entrance or the like, and the monitoring mode is set by the mode selection button 1d.

  When the monitoring mode is started, as shown in FIG. 5A, a response request is transmitted with the maximum output as the slave unit confirmation process (S101). Each slave unit 2 transmits a response signal in response to this response request. The base unit 1 turns on the LED 1e of the corresponding tag number in green, assuming that the slave unit that has received this response signal is within the transmission / reception area (S102). This tag number lit in green indicates that it is a monitoring target. When the green light is not lit, the handset has run out of battery or is not already in the service area. In addition, when the red light is flashing, it indicates that the child device is in the service area and the battery is low.

  When the slave unit confirmation process is completed, the process proceeds to a normal process. In this normal processing, a response request signal is periodically transmitted with a minimum output (S103). At this time, response request signals are collectively transmitted to all tag IDs (group IDs), and all the slave units are monitored depending on whether or not there is a slave unit that responds. As a result, it is possible to monitor the location (approach or passage) of the handset within a predetermined area such as the entrance (S104).

  Then, it is determined whether or not the location of the slave unit has been detected (S105), and if not detected, steps S103 to S106 are repeatedly executed by loop processing through step S107. If a responding slave is detected in step S105, the LED 1e corresponding to the detected tag number of the slave is lit in red. At this time, a remote signal is transmitted to the reporting slave unit 3, and the buzzer of the reporting slave unit 3 is sounded.

  In step S107, it is determined whether or not a predetermined period has arrived. When the predetermined period has arrived ("Y" in step S107), the process proceeds to step S101 to execute a slave unit confirmation time process. To do.

○ Search mode When the passing of a cared person is detected in the above step S106 or there is a handset that is not located in the processing at the time of handset check, the mode is switched to the search mode, and the missing cared person's Do a search.

  First, the tag number of the child device of the care recipient who is the search target is selected by the tag selection button 1f, and the tag ID of the response request signal is set (S201). And a caregiver tracks a caregiver, removing the main | base station 1 from a front door and moving.

  And a response request signal is transmitted with respect to the subunit | mobile_unit which the care receiver who becomes search object wears (S202), and it is judged whether the subunit | mobile_unit was detected (S204).

  If no slave is detected ("N" in step S204), the signal intensity is increased and the search area is expanded (S203). At this time, when the current output is maximum, the maximum output is maintained as it is. On the other hand, if a slave unit is detected in step S204 ("Y" in step S204), the signal intensity is reduced, the search area is reduced, and the blinking interval of the LED corresponding to the reduced signal intensity and The output setting of the buzzer sound is changed (S226), and notification output is performed (S207).

  As a result, when the search target is far away, the search area is enlarged, and the blinking speed of the LED and the buzzer sounding interval are slowed down. The caregiver can be notified of the distance to the search target.

  And when it comes close to a search object to some extent, it switches to a calling mode, and it can discover reliably by ringing the subunit | mobile_unit with which the search object person was mounted | worn.

(Action / Effect)
As described above, according to the monitoring system and the monitoring method of the present embodiment, in the monitoring mode, a response request signal having a weak radio wave intensity is transmitted from the master unit 1, and the care recipient enters (passes through) a predetermined area such as the entrance. ) Can be monitored. On the other hand, in the search mode, the base station 1 is moved, the radio wave intensity of the response request is increased, and the range is changed according to the distance to the care recipient, thereby enabling a wide range search and narrowing down the search range. The position of the care recipient can be specified.

  Further, in the present embodiment, the master unit 1 selects a specific tag ID from a plurality of tag IDs by using the tag selection button 1f, and transmits and receives radio signals. Can be monitored in a batch. In this embodiment, a specific slave unit is selected from a plurality of slave units by tag ID, but the frequency of radio waves transmitted to and received from each slave unit is uniquely set for each slave unit. However, the slave unit may be selected according to the frequency.

  In the monitoring mode according to the present embodiment, since the transmission pattern for periodically transmitting a radio wave signal having a radio wave intensity stronger than the normal radio wave intensity is used as the slave unit confirmation process, it is combined with monitoring in a predetermined area such as an entrance. The number of slave units that are monitored and the power on / off status can be ascertained. Further, since the battery monitoring means is provided on the side of the slave unit, it is possible to confirm the battery drop when the slave unit is confirmed, and it is possible to prevent the monitoring leakage due to the battery running out.

  In the present embodiment, since any slave unit can be called in the master unit 1 in the call mode, the search can be performed even when the monitoring target is hidden or lost. Furthermore, in this embodiment, since the reporting slave unit 3 remotely outputs the master unit 1, monitoring can be performed even when the caregiver is away from the master unit 1.

It is explanatory drawing which shows schematic structure of the monitoring system which concerns on embodiment. It is explanatory drawing which shows the electromagnetic wave transmission pattern of each mode in the main | base station which concerns on embodiment. It is a block diagram which shows the internal structure of each machine which concerns on embodiment. It is a functional block diagram of the microcontroller of each machine concerning an embodiment. It is a flowchart figure which shows operation | movement of the monitoring system which concerns on embodiment.

Explanation of symbols

1 ... Master unit 1a-1c ... LED
1d: Mode selection button 1e: Tag number LED
1f ... Tag selection button 1g ... Switch 1h ... Power LED
2 (2a, 2b ...) ... Slave unit 3 ... Reporting slave unit 11 ... Radio unit 12 ... Control unit 13 ... Display unit 14 ... Power source unit 21 ... Radio unit 22 ... Control unit 23 ... Display unit 24 ... Power source unit

Claims (10)

In the parent machine, a monitoring system for detecting the position of the monitoring object to which the child machine is attached,
The master unit is portable and displays or acoustically outputs a radio signal reception state from the slave unit by transmitting and receiving radio signals, and
The slave unit includes a slave unit that is portable and transmits a radio signal to the master unit in response to a radio signal received from the master unit.
The base unit further includes mode switching means for switching between a monitoring mode and a search mode. In the search mode, depending on the reception state of the radio signal from the slave unit, the radio wave intensity at normal time in the monitoring mode A monitoring system that transmits the radio signal using strong radio field intensity. In the search mode, when the radio signal from the slave unit can be received, the transmission radio field strength is reduced. When the radio signal from the slave unit cannot be received, the transmission radio signal strength is increased. The monitoring system according to claim 1, wherein the radio signal is transmitted in a pattern.   In the monitoring mode, by periodically transmitting a radio signal having a radio field strength stronger than the normal radio field strength, the slave unit is located in the transmission / reception area based on the received signal from the slave unit. The monitoring system according to claim 1, wherein a transmission pattern to be confirmed is used. The mode switching means can be further switched to a call mode,
2. The monitoring system according to claim 1, wherein in the calling mode, a predetermined display or sound output is executed on the side of the slave unit in accordance with a radio wave signal transmitted from the master unit.   The monitoring system according to any one of claims 1 to 4, wherein the display of the reception state or the sound output in the parent device is remotely performed by a portable reporting child device. A monitoring method for detecting the position of a monitoring object,
A base unit that is portable and transmits / receives radio signals is installed at a predetermined position, and the slave unit that is portable and transmits radio signals to the base unit according to the radio signals received from the base unit is monitored. Attached to the object,
By monitoring or outputting the reception state of the radio signal from the slave unit according to the monitoring mode in the master unit, the entry of the monitoring object into a predetermined area is monitored,
While moving the base unit in the search mode in the base unit, according to the reception state of the radio signal from the slave unit, using the radio field strength stronger than the normal radio field strength in the monitoring mode, A monitoring method comprising: searching for the monitoring object by performing transmission and displaying or acoustically outputting a reception state of the radio signal. In the search mode, when the radio signal from the slave unit can be received, the transmission radio field strength is reduced. When the radio signal from the slave unit cannot be received, the transmission radio signal strength is increased. The monitoring method according to claim 6, wherein the radio signal is transmitted with a pattern.   In the monitoring mode, with a transmission pattern for periodically transmitting a radio signal having a radio field strength stronger than the radio field strength at normal time, the location within the transmission / reception area of the slave unit is confirmed based on the received signal from the slave unit. The monitoring method according to claim 6. 7. The call mode in the base unit, wherein a radio signal is transmitted from the base unit, and a predetermined display or sound output is executed on the side of the slave unit in accordance with the transmitted radio signal. Monitoring method. The monitoring method according to any one of claims 6 to 9, wherein the reception state display or sound output in the base unit is remotely performed by a portable reporting slave unit.

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