JP2011232820A - Communication system, monitoring device, measuring instrument and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform intermittent monitoring by a monitoring device by guaranteeing the readiness of measuring and reducing the possibility of causing a communication collision by each measuring instrument in a monitoring system for monitoring a plurality of measuring points.SOLUTION: The monitoring device 1 uses a communication part to distribute a first request signal to each measuring instrument 2 by simultaneous broadcast communication. Each measuring instrument 2 receiving the first request signal determines a request type of each received first request signal. As a result, any measuring instrument 2 determines that the first request signal is received, and each measuring instrument 2 determines whether a numerical value outputted by a measuring part satisfies a condition. At this time, a measuring instrument 2a does not make a reply for the received first request signal because a measurement result by a measuring part does not satisfy a designated condition. On the other hand, a measuring instrument 2b returns a reply signal for the received first request signal to the monitoring device 1 because a measuring result by a measuring part satisfies the designated condition.

Description

  The present invention relates to a communication system, a monitoring device, a measuring instrument, and a program.

  An apparatus that performs measurement by arranging transmitters at a plurality of measurement points has been considered. In Patent Document 1, a unique number transmitter storing a unique number is carried by a racer, and a unique number signal transmitted from the unique number transmitter is detected to detect that the racer has entered the goal line. An apparatus is described. In Patent Document 2, when a sensor of a non-contact communication medium attached to a structure detects an abnormal value, the structure is monitored with a receiving unit that receives an abnormal signal transmitted from the non-contact communication medium. The system is described.

JP-A-8-57104 JP 2008-140178 A

  In Patent Document 1, the trigger signal generation means provided in the goal line does not perform so-called polling in order to each unique number transmitter, but distributes the trigger signal all at once, so it is highly responsive. You can measure. However, each unique number transmitter transmits a unique number signal when it detects a trigger signal. Therefore, if the number of unique number transmitters that receive the trigger signal increases, collision (collision) in the used wireless band is likely to occur. Become.

  Further, the non-contact communication medium of Patent Document 2 does not reply in response to a request transmitted intermittently by the monitoring side, but unilaterally abnormal when a sensor provided for each detects an abnormal value. Send a signal. Therefore, the monitoring system for monitoring the abnormal signal must continuously monitor the non-contact communication medium in order to wait for an abnormal signal that is not known when it is transmitted, and is difficult to maintain.

  The present invention has been made in view of such circumstances, and an object of the present invention is to ensure measurement responsiveness and to cause communication collisions between measurement devices in a monitoring system that monitors a plurality of measurement points. And to enable intermittent monitoring by a monitoring device.

In order to solve the above-described problem, a communication system according to the present invention is a communication system including a monitoring device and a plurality of measuring devices, and the monitoring device receives a first request signal for requesting a reply. A plurality of measurement units, and a first acquisition unit that acquires a first reply signal returned from the measurement device in response to the first request signal distributed by the distribution unit. Each of the devices includes a measurement unit that measures a physical quantity, a determination unit that determines whether a measurement result by the measurement unit satisfies a specified condition, a storage unit that stores identification information indicating itself, A first receiving unit that receives the first request signal from a monitoring device; and when the first receiving unit receives the first request signal, the determination unit determines that the condition is satisfied. Characterized in that it comprises a first return means for returning said first reply signal including the identification information stored in the unit to the monitoring device.
As a result, in a monitoring system that monitors multiple measurement points, measurement responsiveness is ensured, the possibility of communication collisions by each measuring device is reduced, and intermittent monitoring by a monitoring device is possible. can do.

Preferably, the distribution unit of the monitoring device distributes the first request signal including information specifying the condition, and the determination unit of the measuring device includes the information included in the first request signal. It may be determined whether or not the measurement result satisfies the condition specified by.
Thereby, the condition judged in a measuring device can be designated by delivery of a 1st request signal.

Preferably, the distribution means of the monitoring device distributes the first request signal including the information and identification information of any two or more of the plurality of measurement devices, and the measurement device The determination means, when any of the identification information included in the first request signal matches the identification information stored in the storage means, the condition specified by the information included in the first request signal, It may be determined whether or not the measurement result is satisfied.
Thereby, by specifying the measuring device and distributing the first request signal to the measuring device, it is possible to specify the condition determined by the measuring device.

Preferably, the plurality of measuring devices are classified into a plurality of groups, and the storage unit of the measuring device stores group identification information indicating a group to which the plurality of measuring devices belong, and the monitoring device The distribution unit of the apparatus distributes the first request signal including the information and group identification information of any of the plurality of groups, and the determination unit of the measurement device includes the first request signal. Whether or not the measurement result satisfies the condition specified by the information included in the first request signal when the group identification information included and the group identification information stored in the storage unit match. It is good to judge.
As a result, it is possible to specify conditions determined by the measuring device by specifying the measuring device in units of groups and distributing the first request signal to the measuring devices belonging to the group.

Preferably, the measuring unit of the measuring device outputs a numerical value obtained by measuring a physical quantity, and the determining unit of the measuring device outputs a numerical value output by the measuring unit and the measuring unit before the numerical value. When the difference from the numerical value output by exceeds the threshold value, it may be determined that the measurement result satisfies the condition.
As a result, the measurement device returns the first reply signal to the first request signal only when there is a certain change compared to the previous measurement, so the communication amount, power consumption, etc. are suppressed. As a result, communication collisions are less likely to occur.

Preferably, the monitoring device transmits a second request signal for requesting a response to each of the plurality of measuring devices in accordance with a priority order determined for each measuring device, and the transmission Second acquisition means for acquiring a second reply signal returned from the measurement device in response to the second request signal transmitted by the means, and each of the plurality of measurement devices receives the second signal from the monitoring device. A second receiving means for receiving a request signal; and when the second receiving means receives the second request signal, the second reply signal including the identification information stored in the storage means is returned to the monitoring device. It is good to provide a 2nd reply means.
As a result, the monitoring device can distinguish whether the first reply signal is not returned by the measuring device due to an operation failure due to a failure or the like, or because the measurement result does not satisfy the specified condition. .

Preferably, the monitoring device generates a list in which each of the plurality of measuring devices is arranged in descending order of priority, and the first reply signal returned from the measuring device is the first reply signal. When the acquisition unit acquires, the measurement device that has returned the first reply signal is excluded from the list generated by the generation unit, or moved to the lowest in the priority order of the list, so that the list is displayed. It is preferable that the monitoring device includes a changing unit that changes the second request signal according to the priority in the list changed by the changing unit.
As a result, when the first reply signal is acquired and the operation check for a certain measuring device is performed, the second request signal is not transmitted to the measuring device at least immediately thereafter, so the traffic is suppressed, Communication collisions are easily avoided.

The monitoring device according to the present invention stores measurement means for measuring a physical quantity, determination means for determining whether a measurement result by the measurement means satisfies a specified condition, and identification information indicating itself. A plurality of storage units; and a reply unit that returns a reply signal including the identification information stored in the storage unit when the determination unit determines that the condition is satisfied when the request signal is received. A distribution unit that distributes a request signal for requesting a reply to each of the measurement devices; and an acquisition unit that acquires the reply signal returned from the measurement device in response to the request signal distributed by the distribution unit. It is characterized by providing.
Thereby, the monitoring apparatus can monitor a some measurement point intermittently.

In addition, the measuring device according to the present invention stores a measuring unit that measures a physical quantity, a determining unit that determines whether a measurement result by the measuring unit satisfies a specified condition, and identification information indicating itself. Storage means, receiving means for receiving the request signal from a monitoring device that distributes a request signal for requesting a reply, and when the receiving means receives the request signal, the determining means determines that the condition is satisfied In this case, the apparatus includes a reply unit that returns the reply signal including the identification information stored in the storage unit to the monitoring device.
Thereby, the possibility that the communication between the measuring devices collides is reduced.

The program according to the present invention includes a measuring unit that measures a physical quantity, a storage unit that stores identification information indicating itself, a receiving unit that receives the request signal from a monitoring device that distributes a request signal that requests a reply. A measurement device comprising: a determination unit that determines whether a measurement result by the measurement unit satisfies a specified condition; and the reception unit receives the request signal, the determination unit sets the condition When it is determined that the condition is satisfied, the program is a program for causing the reply signal including the identification information stored in the storage unit to function as a reply unit that returns the reply signal to the monitoring device.
With this program, in a monitoring system that monitors multiple measurement points, it ensures measurement responsiveness, reduces the possibility of communication collisions with each measuring device, and enables intermittent monitoring by a monitoring device Can be.

It is a figure which shows the outline of the communication system which concerns on embodiment of this invention. It is a figure which shows the structure of a monitoring apparatus. It is a figure which shows an example of the monitoring table. It is a figure which shows the structure of a measuring device. It is a figure which shows the functional structure of a monitoring apparatus. It is a figure which shows the functional structure of a measuring device. It is a figure explaining operation | movement at the time of a monitoring apparatus delivering a 1st request signal. It is a figure explaining the operation | movement at the time of a monitoring apparatus transmitting a 2nd request signal. It is a figure for demonstrating operation | movement of a measuring device. It is a figure which shows an example of operation | movement of a communication system. It is a figure which shows the operation example of a communication system. It is a figure which shows the operation example of the monitoring system in a prior art. It is a figure which shows the operation example of the monitoring system in a prior art. It is a figure which shows the operation example of the communication system which concerns on the modification of this invention.

1. Configuration 1-1. Overall Configuration FIG. 1 is a diagram showing an outline of a communication system 9 according to an embodiment of the present invention. The communication system 9 is a system including the monitoring device 1 and a plurality of measuring devices 2. The purpose of the communication system 9 is to identify and repair a plurality of revetment blocks 3 that have tilted beyond a threshold value and prevent their loss or collapse. The revetment block 3 is affixed to the slope of a dike facing a river or the sea to prevent erosion of the dike.
One measuring device 2 is fixed for each revetment block 3, measures its inclination, and performs wireless communication with the monitoring device 1 according to the measurement result.
The monitoring device 1 communicates with a plurality of measuring devices 2 wirelessly and monitors the measurement content measured by each measuring device 2.

1-2. Configuration of Monitoring Device FIG. 2 is a diagram illustrating a configuration of the monitoring device 1. The controller 11 is driven by receiving power from a power source (not shown). The control unit 11 is a control unit including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a timer, and the like, and is a computer program (hereinafter referred to as “ROM”) stored in the ROM or the storage unit 12. Each unit of the monitoring device 1 is controlled by reading out and executing a program) on the RAM. The ROM is a read-only nonvolatile storage device composed of a semiconductor element or the like, and the RAM is a volatile storage device. The RAM is used as a work area when the CPU of the control unit 11 executes a program. The timer includes an oscillation circuit having a crystal resonator, measures time based on an oscillation signal output from the oscillation circuit, and calculates the current time. The control unit 11 functions as, for example, a transmission unit 112, a distribution unit 111, and an acquisition unit 113 described later.

The communication unit 13 is a communication interface that exchanges information with the measurement device 2 by wireless communication.
The storage unit 12 is a large-capacity storage unit such as a hard disk drive, and stores a program read by the control unit 11. The storage unit 12 stores a monitoring table 121 that describes the installation position and operation state of each measuring device 2.

1-3. Configuration of Monitoring Table The monitoring table 121 stored in the storage unit 12 will be described.
FIG. 3 is a diagram illustrating an example of the monitoring table 121. In the monitoring table 121, one record is associated with each measuring device 2, and information about the corresponding measuring device 2 is described in each record. The monitoring table 121 has four fields: device ID (Identifier), installation position, operation state, and abnormality sign. In the field of “device ID”, identification information (hereinafter referred to as device ID) for identifying the measuring device 2 associated with each record is described. In the “installation position” field, a position where the revetment block 3 that fixes each measuring device 2 is installed (hereinafter referred to as an installation position) is described. For example, when the rectangular revetment blocks 3 are installed side by side in the vertical and horizontal directions, the installation position is described as “one row and two columns” using the arranged vertical and horizontal positions.

  In the “operating state” field, information indicating whether each measuring device 2 is operating is described. Specifically, when “O” is described in this field, it indicates that the operation of the measuring device 2 associated with this record has been confirmed, and “X” is described. In this case, this measuring device 2 indicates that the operation has not been confirmed.

  In the “abnormal sign” field, information indicating whether or not the numerical value measured by each measuring device 2 exceeds a threshold value is described. Specifically, when “none” is described in this field, the value measured by the measuring device 2 associated with this record does not exceed the threshold value, and thus this measuring device 2 is abnormal. This indicates that there is no sign of. On the other hand, when “present” is described in this field, the numerical value measured by the measuring device 2 exceeds the threshold value, which indicates that the measuring device 2 has a sign of abnormality. .

1-4. Configuration of Measuring Device FIG. 4 is a diagram illustrating a configuration of the measuring device 2. The control unit 21 is driven by receiving power from a power source such as a battery (not shown). The control unit 21 is a control unit including a CPU, a ROM, and a RAM, and controls each unit of the measuring device 2 by reading a program stored in the ROM or the storage unit 22 into the RAM and executing it. For example, the control unit 21 functions as a reception unit 211, a determination unit 212, and a reply unit 213 described later.

The communication unit 23 is a communication interface that exchanges information with the monitoring device 1 by wireless communication.
The storage unit 22 is a storage unit such as an EEPROM (Electrically Erasable Programmable Read Only Memory), and stores a program read by the control unit 21. The storage unit 22 stores a device ID 221 for identifying the measuring device 2 and a predetermined threshold value 222.

  The measurement unit 24 is an example of a measurement unit that measures a physical quantity. The measurement unit 24 includes an acceleration sensor, and detects an angle at which the attachment surface of the revetment block 3 to which the measurement device 2 is attached is inclined with respect to the direction of gravity.

1-5. Functional Configuration of Monitoring Device FIG. 5 is a diagram illustrating a functional configuration of the monitoring device 1.
The distribution unit 111 is an example of a distribution unit that distributes a first request signal for requesting a reply to a plurality of measuring devices 2. Specifically, the distribution unit 111 generates a first request signal DS1 that requests a reply from one of the measuring devices 2 that has an abnormality sign, and uses the communication unit 13 to generate the first request signal DS1. Delivered to each measuring device 2 by simultaneous broadcast communication. In the header portion of the first request signal DS1, information indicating that it is the first request signal DS1 is described. Note that the simultaneous broadcast communication means that the same content is communicated at once to a plurality of unspecified communication partners.

  The transmission unit 112 is an example of a transmission unit that transmits a second request signal for requesting a response to each of the plurality of measuring devices in accordance with the priority order determined for each of the measuring devices. Specifically, the transmission unit 112 transmits a second request signal DS2 for requesting a response to each of the measuring devices 2 in order from the top of the monitoring table 121 stored in the storage unit 12. Here, the records are described in the monitoring table 121 so that the higher the order of priority is, the higher the priority is. Therefore, for example, when referring to the monitoring table 121 shown in FIG. 3, the transmission unit 112 performs this operation on each measuring device 2 whose device ID is “2001” → “2002” → “2003” → “2004”. The second request signal DS2 is transmitted in order. In the header portion of the second request signal DS2, information indicating that it is the second request signal DS2 and the device ID of the measuring device 2 that is a transmission destination for transmitting the information are described.

  The acquisition unit 113 is an example of a first acquisition unit that acquires a first reply signal returned from the measuring device in response to the first request signal distributed by the distribution unit, and the second request signal transmitted by the transmission unit. It is an example of the 2nd acquisition means which acquires the 2nd reply signal replied with respect to measurement equipment. When the acquired signal is the first reply signal, the acquiring unit 113 identifies the record in which the device ID included in the first reply signal is described from the monitoring table 121, and indicates an abnormality sign of the record Write "Yes" in the field. In addition, the acquisition unit 113 does not return the second reply signal from the measuring device 2 and does not acquire the second reply signal even if a predetermined period has passed after the transmission unit 112 transmits the second request signal DS2. In this case, a record in which the device ID as the transmission destination of the transmitted second request signal DS2 is specified from the monitoring table 121, and “x” is written in the field of the operation state of the record. When the acquired signal is the second reply signal, the acquiring unit 113 identifies the record in which the device ID included in the second reply signal is described from the monitoring table 121, and You may make it write "(circle)" in the field of an operation state.

  The distribution unit 111, the transmission unit 112, and the acquisition unit 113 are realized by executing a program by the control unit 11 of the monitoring device 1.

1-6. FIG. 6 is a diagram illustrating a functional configuration of the measuring device 2.
The receiving unit 211 is an example of a first receiving unit that receives the first request signal from the monitoring device, and is an example of a second receiving unit that receives the second request signal from the monitoring device. Specifically, the reception unit 211 determines the type of the request signal received by the communication unit 23 (hereinafter referred to as the request type), and determines that the request signal is the first request signal DS1. The unit 212 determines whether the measurement result by the measurement unit 24 satisfies the specified condition. On the other hand, if it is determined that the request signal is the second request signal DS2, the reply unit 213 performs reply processing.

The determination unit 212 is an example of a determination unit that determines whether a measurement result by the measurement unit satisfies a specified condition. Specifically, it is as follows.
The measurement part 24 measures the inclination angle with respect to the gravity direction of the revetment block 3 as a physical quantity, and outputs a numerical value representing the angle. The determination unit 212 compares the numerical value output from the measurement unit 24 with the threshold value 222 read from the storage unit 22, and determines whether this numerical value exceeds the threshold value 222. Only when it is determined that the numerical value representing the tilt angle exceeds the threshold value 222, the reply unit 213 performs reply processing.

  When the first receiving unit receives the first request signal, the reply unit 213 sends the first reply signal including the identification information stored in the storage unit to the monitoring device when the determination unit determines that the condition is satisfied. Second reply means is an example of first reply means for replying, and when the second receiving means receives the second request signal, the second reply means for replying the second reply signal including the identification information stored in the storage means to the monitoring device It is an example. Specifically, if the request signal received by the reception unit 211 is determined to be the first request signal DS1, as described above, the numerical value indicating the tilt angle output by the measurement unit 24 in the determination unit 212 is the threshold value 222. The reply unit 213 performs a reply process only when it is determined that the number exceeds. The reply process is a process of including the device ID 221 stored in the storage unit 22 in the reply signal and sending it back to the monitoring apparatus 1 via the communication unit 23. Therefore, when the numerical value output by the measuring unit 24 exceeds the threshold value 222 with respect to the first request signal DS1, the reply unit 213 sends a reply signal including the device ID 221 (hereinafter referred to as the first reply signal RS1). Send back.

  On the other hand, if the request signal received by the receiving unit 211 is determined to be the second request signal DS2, as described above, the reply unit 213 performs a reply process. Therefore, the reply unit 213 returns a reply signal including the device ID 221 (hereinafter referred to as the second reply signal RS2) unconditionally to the second request signal DS2.

  The reception unit 211, the determination unit 212, and the reply unit 213 are realized by executing a program by the control unit 21 of the measuring device 2.

2. Operation 2-1. Operation of Monitoring Device The monitoring device 1 roughly performs two types of processing: processing for distributing the first request signal DS1 and processing for transmitting the second request signal DS2. These two types of processing are processed in parallel. In the following, operations when performing these two types of processing will be described.

2-1-1. Operation for Distributing First Request Signal FIG. 7 is a diagram illustrating an operation when the monitoring device 1 distributes the first request signal DS1.
Before the communication system 9 operates, “none” is described in advance in all abnormal signs fields in the monitoring table 121 of the storage unit 12. This is because all the revetment blocks 3 are not damaged immediately after construction and do not tilt beyond the threshold.

  The control unit 11 of the monitoring device 1 determines whether there is a distribution instruction for distributing the first request signal DS1 (step S111). This distribution instruction is triggered by, for example, an interrupt signal periodically generated by a timer. The control unit 11 continues this determination process while determining that there is no distribution instruction (step S111; NO). If it is determined that there is a distribution instruction (step S111; YES), the control unit 11 distributes the first request signal DS1 (step S112), and accepts a reply of the first reply signal RS1 to the first request signal DS1. The control unit 11 determines whether or not the first reply signal RS1 has been acquired (step S113). If it is determined that the first reply signal RS1 has been acquired (step S113; YES), the control unit 11 specifies the device ID included in the acquired first reply signal RS1, and the device ID is described in the monitoring table 121. The abnormal sign field of the current record is changed to “present” (step S114). After that, the control unit 11 determines whether or not the period for acquiring the reply signal is equal to or shorter than the period for acquiring the reply signal (step S115). The “acquisition period” is an elapsed period from when the control unit 11 delivers the first request signal DS1. If it is determined in step S113 that the first reply signal RS1 has not been acquired (step S113; NO), the control unit 11 performs a determination process in step S115.

  When it is determined that the acquisition period has ended (step S115; YES), the control unit 11 ends the process. If it is determined that the acquisition period has not ended (step S115; NO), the control unit 11 returns the process to step S113.

2-1-2. Operation for Transmitting Second Request Signal FIG. 8 is a diagram illustrating an operation when the monitoring apparatus 1 transmits the second request signal DS2.
In addition, before the communication system 9 operates, “◯” is described in advance in all the operation state fields in the monitoring table 121 of the storage unit 12. This is because all the measuring devices 2 are not broken immediately after the construction.

  The control unit 11 specifies the next device ID (step S121). For example, immediately after the monitoring device 1 is activated, the device ID described in the top record in the monitoring table 121 of the storage unit 12 is specified as this device ID. On the other hand, when the processing returns to step S121 after performing other processing, the device ID described in the next record in the monitoring table 121, that is, the record immediately below the previous record is set as the device ID. As specified.

  Next, the control unit 11 refers to the time indicated by the timer, and determines whether or not it is time to transmit the second request signal DS2 (hereinafter referred to as transmission time) (step S122). The control unit 11 continues this determination process while determining that the transmission time has not come (step S122; NO). When determining that the transmission time has arrived (step S122; YES), the control unit 11 transmits the second request signal DS2 to the measuring device 2 identified by the device ID specified in step S121 (step S123). A reply of the second reply signal RS2 with respect to the second request signal DS2 is accepted. Specifically, the control unit 11 includes the device ID in the second request signal DS2 and causes the communication unit 13 to transmit it.

  Next, the control part 11 judges whether 2nd reply signal RS2 was acquired (step S124). If the control part 11 judges that 2nd reply signal RS2 was acquired (step S124; YES), a process will be returned to step S121. When determining that the second reply signal RS2 has not been acquired (step S124; NO), the control unit 11 determines whether or not the acquisition period has ended (step S125). This “acquisition period” is an elapsed period from when the control unit 11 delivers the second request signal DS2. When the control unit 11 determines that the acquisition period has not ended (step S125; NO), the control unit 11 returns the process to step S124. If it is determined that the acquisition period has ended (step S125; YES), the control unit 11 is the transmission destination that has transmitted the second request signal DS2, and does not return the second reply signal RS2 to the second request signal DS2. The device ID of the measuring device 2 is specified, and the field of the operation status of the record in which the device ID is described is changed to “x” in the monitoring table 121 (step S126). Thereafter, the control unit 11 returns the process to step S121.

2-2. Operation of Measuring Device FIG. 9 is a diagram for explaining the operation of the measuring device 2. The control unit 21 of the measurement device 2 determines whether there is a request signal received from the monitoring device 1 (step S211). While determining that there is no request signal (step S211; NO), the control unit 21 continues this determination. If it is determined that there is a request signal (step S211; YES), the control unit 21 determines the type of the request signal. Specifically, referring to the header of the request signal, it is determined whether or not the request signal is the first request signal DS1 (step S212). When determining that the request signal received from the monitoring device 1 is the first request signal DS1 (step S212; YES), the control unit 21 causes the measurement unit 24 to perform measurement, and the numerical value output by the measurement unit 24 is stored in the storage unit. It is determined whether or not the threshold value 222 stored in 22 is exceeded, that is, whether or not the measurement result of the measurement unit 24 satisfies a predetermined condition (step S213). When determining that the condition is not satisfied (step S213), the control unit 21 returns the process to step S211. If it is determined that the condition is satisfied (step S213; YES), the control unit 21 returns the first reply signal RS1 to the received first request signal DS1 (step S214), and ends the process.

  When determining in step S212 that the request signal received from the monitoring device 1 is not the first request signal DS1 (step S212; NO), the control unit 21 transmits the second request to which the received request signal is transmitted. It is determined whether or not the signal is DS2 (step S215). Specifically, the control unit 21 determines whether or not information indicating that it is the second request signal DS2 and the device ID of the measurement device 2 are both described in the header portion of the request signal. to decide.

When determining that the received request signal is not the second request signal DS2 transmitted to itself (step S215; NO), the control unit 21 returns the process to step S211.
If it is determined that the received request signal is the second request signal DS2 transmitted to itself (step S215; YES), the control unit 21 returns a second reply signal RS2 to the second request signal DS2 ( Step S216), the process ends.

2-3. Operation of Communication System As described above, the communication system 9 operates when the monitoring device 1 and the plurality of measuring devices 2 perform processing.
FIG. 10 is a diagram illustrating an example of the operation of the communication system 9. The communication system 9 shown in the figure includes two measuring devices 2 a and 2 b as a plurality of measuring devices 2. Hereinafter, when there is no need for distinction, these are collectively referred to as “measuring instrument 2”.

  The monitoring device 1 distributes the first request signal DS1 to each measuring device 2 by simultaneous broadcast communication using the communication unit 13 (step S11). Each measuring device 2 that has received the first request signal DS1 determines the request type of the received first request signal DS1 (steps S21a and S21b). As a result, it is determined that any of the measuring devices 2 has received the first request signal DS1, and each measuring device 2 determines whether the numerical value output by the measuring unit 24 satisfies the condition. Here, the measurement result by each measurement unit 24 of each measurement device 2 is measured on the assumption that the measurement device 2a does not satisfy the specified condition and the measurement device 2b satisfies the specified condition. Since the device 2a determines that the above condition is not satisfied (step S22a), the device 2a does not reply to the received first request signal DS1. On the other hand, since the measuring device 2b determines that the above condition is satisfied (step S22b), it returns a first reply signal RS1 to the received first request signal DS1 to the monitoring device 1 (step S23b).

In addition, the monitoring device 1 reads out device IDs sequentially from the top of the monitoring table 121 stored in the storage unit 12, and describes the information indicating that it is the second request signal DS2 and the read device ID. The second request signal DS2 is sequentially transmitted using the communication unit 13.
For example, as shown in the figure, the monitoring device 1 reads the device ID of the measuring device 2a from the monitoring table 121, and transmits the second request signal DS2 to the measuring device 2a (step S12a). The measuring device 2a determines the request type of the received second request signal DS2 (step S24a). Then, the measuring device 2a determines that this is the second request signal DS2 transmitted toward itself, and returns a second reply signal RS2 corresponding to the second request signal DS2 to the monitoring device 1 (step S25a). The monitoring apparatus 1 that has acquired the second reply signal RS2 from the measuring device 2a subsequently reads the next device ID in the monitoring table 121 and transmits the second request signal DS2 to the measuring device 2b (step S12b). The measuring device 2b determines the request type of the received second request signal DS2 (step S24b). Then, the measuring device 2b determines that this is the second request signal DS2 transmitted toward itself, and returns a second reply signal RS2 for the second request signal DS2 to the monitoring device 1 (step S25b).

2-4. Operation Example FIG. 11 is a diagram illustrating an operation example of the communication system 9. The horizontal axis in the figure represents the flow of time, indicating that time has passed from left to right. Numbers 0 to 12 are written at the upper end of the figure, and represent the elapsed time. The unit of this numerical value is second. At the left end of the figure, the device IDs of the measuring devices 2 constituting the communication system 9 are arranged in the vertical direction. There are six measuring devices 2 and their device IDs are “2001” to “2006”. The triangle described at the lower end of the figure represents the timing at which the monitoring device 1 delivers the first request signal. A white square in the figure represents the timing at which the monitoring apparatus 1 sequentially transmits the second request signal. A black square in the figure, or a square with parallel diagonal lines inside, indicates that the measuring device 2 has returned the first reply signal in response to the first request signal. The return signal acquisition period for each request signal is set to 1 second. That is, the monitoring device 1 pauses every 3 seconds for 2 seconds, and the measuring device 2 enters a standby state waiting for a request from the monitoring device 1.

  In the communication system 9, the monitoring device 1 distributes the first request signal and transmits the second request signal every 3 seconds. At the time of 0 second, the numerical value measured by any measuring device 2 does not exceed the threshold value. That is, no abnormality sign is seen in any measuring device 2. Therefore, the monitoring device 1 does not acquire the first reply signal within 0 to 1 second. Since the device ID read in the monitoring table 121 is “2001” at 0 second, the monitoring device 1 transmits a second request signal to the measuring device 2 corresponding to the device ID “2001”. In response to this, a second reply signal is obtained. As a result, the monitoring device 1 confirms that the measuring device 2 is operating normally.

  Next, it is assumed that an abnormality occurs in the measuring device 2 whose device ID is “2003” at the time of 0.5 seconds. That is, since the revetment block 3 to which the measuring device 2 is fixed is tilted, the numerical value measured by the measuring device 2 exceeds the threshold value. At the time of 3 seconds, the second first request signal is distributed from the monitoring device 1. At this time, the first reply signal is returned from the measuring device 2 having the device ID “2003”, and the monitoring device 1 recognizes that the measuring device 2 has an abnormality sign. At this time, since the second request signal is transmitted to the measuring device 2 with the device ID “2002”, the monitoring device 1 operates normally when the measuring device 2 with the device ID “2002” operates normally. Make sure. Since the first request signal is distributed every 3 seconds in this way, the abnormal sign that has occurred is captured within 3 seconds at the longest. For example, assuming that an abnormality occurs in the measuring device 2 whose device ID is “2006” at the time of 7.5 seconds, this abnormality that has occurred is recognized by the monitoring device 1 within 9 to 10 seconds.

  Here, the example of a prior art is demonstrated for a comparison. FIG. 12 is a diagram illustrating an operation example of the monitoring system according to the related art. The monitoring apparatus shown in the figure requests that all the measuring devices return their identification information and measurement contents by a request signal distributed by broadcast communication every 3 seconds. In this case, the time until the monitoring device recognizes an abnormality that has occurred in the measuring device is the same as that of the communication system 9 according to the present invention. However, since the monitoring device shown in FIG. 3 accepts replies from all measuring devices every 3 seconds regardless of whether there is an abnormality or not, if the number of measuring devices increases, a collision easily occurs in communication.

  FIG. 13 is a diagram illustrating an operation example of a monitoring system according to another conventional technique. The monitoring device shown in the figure performs so-called polling every second without performing simultaneous broadcast communication, and sequentially confirms whether or not an abnormality has occurred in each measuring device. In this case, an abnormality that has occurred in the measuring device 2 whose device ID is “2003” at the time of 0.5 seconds is recognized by the monitoring device 1 within 2 to 3 seconds. However, the abnormality that has occurred in the measuring device 2 having the device ID “2006” at the time of 7.5 seconds is not recognized by the monitoring device 1 unless it is after 11 seconds. In other words, in this way, when the presence or absence of abnormality is sequentially confirmed for all measuring devices by polling, the number of measuring devices becomes longer in proportion to the number of measuring devices, so a large number of measuring points are monitored. The system lacks responsiveness of monitoring.

As described above, in the communication system 9 according to the embodiment of the present invention, since the monitoring device 1 can be intermittently monitored, maintenance is easier compared to a device that needs to be continuously monitored. .
Moreover, since the monitoring apparatus 1 acquires a 1st reply signal from the measuring device 2 in which abnormality was detected with respect to the 1st request signal delivered by simultaneous broadcast communication, the monitoring which acquires a reply from all the measuring devices 2 Compared with the device, the possibility of collision occurring in communication is low.
Moreover, since the monitoring apparatus 1 distributes a 1st request signal by simultaneous broadcast communication, and acquires the 1st reply signal with respect to this 1st request signal, it is abnormal by inquiring to all the measuring devices 2 in order. Compared with a monitoring device that checks the presence or absence, the occurrence of an abnormality can be recognized quickly.

In addition, the monitoring device 1 transmits the second request signal to all the measuring devices 2 in order separately from the first request signal distributed by the broadcast communication, thereby causing a failure or the like in the measuring device 2. Since an operation has not been confirmed, the first reply signal is not returned by the measuring device 2 due to an operation failure due to a failure or the like, or the measurement result does not satisfy the specified condition. It can be distinguished.
Moreover, since the measuring device 2 only needs to perform measurement when the first request signal is delivered from the monitoring device 1, it suppresses power consumption compared to a measuring device that needs to continue to measure continuously. be able to.

3. Modification The above is the description of the embodiment, but the contents of this embodiment can be modified as follows. Further, the following modifications may be combined.

(1) In the above-described embodiment, the monitoring device 1 performs measurement by sequentially transmitting the second request signal to all the measuring devices 2 separately from the first request signal distributed by broadcast communication. Although the device 2 that has not been confirmed to operate due to a failure or the like has been discovered, the monitoring device 1 may not transmit the second request signal.

(2) In the above-described embodiment, the determination unit 212 realized by the control unit 21 compares the numerical value output by the measurement unit 24 with the threshold value 222 read from the storage unit 22, and this numerical value sets the threshold value 222. Only when it is determined whether or not the numerical value exceeds the threshold value 222, the reply unit 213 performs a reply process. Instead of reading the threshold value 222 from the storage unit 22, You may extract from a 1st request signal. In this case, the control unit 11 of the monitoring device 1 may distribute the first request signal by including the threshold value 222. The threshold value 222 included in the first request signal may be input by a user via an operation unit (not shown) of the monitoring device 1.

Further, the numerical value output by the measuring unit is not limited to one and may be two or more, and the threshold 222 may be two or more. For example, when any one of two or more output values is within a certain range indicated by two or more threshold values, the control unit 11 of the monitoring device 1 is designated with a measurement result by the measuring unit. It may be determined that the condition is satisfied. In short, the distribution means of the monitoring device distributes information specifying the condition in the first request signal, and the determination means of the measuring device determines the condition specified by the information included in the first request signal as the measurement result. What is necessary is just to judge whether or not.
Thereby, the conditions determined in the measuring device 2 can be specified by the distribution of the first request signal.

(3) In the above-described modification, the control unit 11 of the monitoring device 1 distributes information specifying a condition in the first request signal. In addition to this information, the control unit 11 is a target to be distributed 2 Each device ID of the above measuring device 2 may be included in the first request signal and distributed. In this case, the control unit 21 of the measurement device 2 compares the device ID included in the received first request signal with the device ID stored in the storage unit 22, and when both match, the measurement unit 24 It may be determined whether or not the measurement result by satisfies the specified condition. That is, the control unit 11 of the monitoring device 1 distributes information including a condition specified in the first request signal and any two or more device IDs of the plurality of measurement devices 2, and distributes the measurement device control unit. 21. If any of the device IDs included in the first request signal matches the device ID stored in the storage means, whether the measurement result satisfies the condition specified by the information included in the first request signal It may be determined whether or not.
Thus, by specifying a plurality of measuring devices 2 and distributing the first request signal to each of the measuring devices 2, it is possible to specify conditions determined by those measuring devices 2, respectively.

(4) In the above-described modification, the control unit 11 of the monitoring device 1 requests the device IDs of two or more measuring devices 2 to be distributed in addition to the information specifying the condition in the first request signal. Although it was distributed in the signal, in addition to the device ID or in place of the device ID, a group ID (group identification information) for identifying the group to which the measuring device 2 belongs is included in the first request signal and distributed. May be.

  In this case, the plurality of measuring devices 2 are classified into a plurality of groups, and the storage unit 22 of the measuring device 2 may store a group ID indicating a group to which the measuring device 2 belongs. Then, the control unit 21 of the measuring device 2 determines the condition specified by the information included in the first request signal when the group ID included in the first request signal matches the group ID stored in the storage unit 22. It may be determined whether or not the measurement result is satisfied. The group ID included in the first request signal is not limited to one and may be two or more.

  Thereby, the conditions determined by the measuring device 2 can be specified by specifying the measuring device 2 in units of groups and distributing the first request signal to the measuring devices 2 belonging to the group.

(5) In the above-described embodiment, the control unit 21 of the measurement device 2 causes the measurement unit 24 to perform measurement, and determines whether the numerical value output from the measurement unit 24 exceeds the threshold value 222 stored in the storage unit 22. However, the measurement unit 24 may perform measurement at least twice, and it may be determined whether the amount of change (difference) in the numerical value output by the measurement unit 24 exceeds a threshold value. That is, the control unit 21 determines that the measurement result satisfies the condition when the difference between the numerical value output by the measuring unit and the numerical value output by the measuring unit before the numerical value exceeds a threshold value. do it.

  For example, in FIG. 11, “black square” indicates the timing of returning the first reply signal for the first request signal only after an abnormality occurs in the measuring device 2. “Rectangle” indicates the timing at which the first reply signal is returned after one or more replies have been made since the abnormality occurred in the measuring device 2. Therefore, in the latter case, the difference may not change. As described above, when the difference exceeds the threshold value, if it is determined that the condition is satisfied and the first reply signal is returned, the latter communication is omitted.

  As a result, the measuring device 2 returns the first reply signal to the first request signal only when there is a certain change compared to the previous measurement. In addition to being suppressed, communication collisions are less likely to occur. In addition, you may memorize | store the numerical value output by the last measurement in RAM, the memory | storage part 22, etc. of the control part 21, for example.

(6) In the above-described embodiment, the monitoring device 1 reads out the device ID sequentially from the monitoring table 121 stored in the storage unit 12 and reads out information indicating that it is the second request signal DS2. In addition, the second request signal DS2 describing the device ID was sequentially transmitted using the communication unit 13, but the order in which the second request signal DS2 is transmitted is changed according to the acquired first reply signal RS1. May be.

  For example, the monitoring device 1 stores a device ID list (list) in which the rank is assigned to the device ID of the measuring device 2 in the storage unit 12. When the monitoring device 1 is activated, the device ID list is generated by the control unit 11 based on the device ID array by reading the monitoring table 121 in order from the top. And the control part 11 should just transmit 2nd request signal DS2 not according to the monitoring table 121 but according to the priority in this apparatus ID list | wrist. When the monitoring device 1 acquires the first reply signal from the measuring device 2, the control unit 11 excludes the device ID included in the first reply signal from the device ID list or in the priority order of the device ID list. Move to the bottom.

  FIG. 14 is a diagram illustrating an operation example of the communication system 9 when the device ID included in the first reply signal acquired from the measuring device 2 by the monitoring device 1 is excluded from the device ID list. As shown in the figure, at the time point of 3 to 4 seconds, the monitoring device 1 recognizes that an abnormality has occurred in the measuring device 2 whose device ID is “2003”, and the measuring device 2 operates. Recognize that Here, the control unit 11 excludes “2003” from the device ID list. At the time of 6 seconds, the monitoring device 1 distributes the first request signal and transmits the second request signal. At this time, since the monitoring device 1 reads the next device ID from the device ID list from which “2003” is excluded, the second request signal is transmitted to the measuring device 2 whose device ID is “2004”. .

  Thus, by excluding the device ID included in the first reply signal from the device ID list, the subsequent operation check is not performed on the measuring device 2 that is recognized as having an abnormality sign, so the communication amount is high. It is suppressed, and communication collision is easily avoided. In addition, the operation confirmation for all the measuring devices 2 can be completed faster than in the case where such exclusion is not performed.

  In addition, since it is clear that the measuring device 2 that has just returned the first reply signal has not failed, the device ID included in the first reply signal is the lowest in the priority order of the device ID list as described above. By moving to, it is possible to postpone the timing for performing the operation check of the measuring device 2 that is clearly not broken. This also reduces the amount of communication and facilitates avoiding communication collisions. That is, when the first acquisition unit acquires the generation unit that generates a list in which each of the plurality of measurement devices is arranged in descending order of priority, and the first acquisition unit returns the first reply signal, the monitoring device 1 1 is provided with a changing means for changing the list by excluding the measuring device that has returned the reply signal from the list generated by the generating means or moving it to the lowest priority in the list. The transmission means may transmit the second request signal in accordance with the priority order in the list changed by the changing means.

(7) Each program executed by the control unit 11 and the control unit 21 is read by a computer device such as a magnetic recording medium such as a magnetic tape or a magnetic disk, an optical recording medium such as an optical disk, a magneto-optical recording medium, or a semiconductor memory. It may be provided in a state stored in a possible recording medium. It is also possible to download this program via a network such as the Internet. Various devices other than the CPU can be applied as the control means exemplified by the control unit 11 and the control unit 21. For example, a dedicated processor or the like may be used. Various functions realized by the control unit 11 and the control unit 21 executing the program may be realized by dedicated processors or the like.

(8) In the above-described embodiment, the communication system 9 is used to detect an abnormality in the inclination of the revetment block 3, but can be applied to various other fields. For example, a plurality of measuring devices 2 including temperature sensors that measure the ambient temperature may be distributed on the farmland, and the monitoring device 1 may monitor temperature changes at each measurement point on the farmland. In addition, measuring devices 2 equipped with sensors for measuring humidity and calorific value are arranged in a plurality of incubators stored in a culture room such as mushrooms, and changes are monitored. Based on this, temperature and humidity management are performed. May be performed. In addition, the measuring device 2 equipped with an acceleration sensor, an angular velocity sensor, etc. is fixed to the pile embedded in the boundary of the land, and changes in the position and inclination of the pile are monitored to prevent illegal acts related to land ownership. Also good. Moreover, even if the occurrence of pests, rainfall, sunlight, pollen scattering, etc. are monitored by applying the measuring device 2 provided with sensors for detecting pests, raindrops, illuminance, pollen, etc. to the communication system 9. Good.

(9) Although one measuring device 24 is provided in one measuring device 2, two or more measuring units may be provided. For example, the measuring device 2 may include a measuring unit that measures each of temperature and acceleration. Further, the voltage value of the battery may be measured by a measuring unit provided in the measuring device 2. In this case, when the battery voltage value becomes equal to or lower than a predetermined voltage value, it may be determined not to reply.

(10) When two or more measuring devices 2 reply to one first request signal, a communication collision may occur. In this case, it is only necessary to stop the signal output to the measuring devices 2 except for one measuring device 2 and to avoid a collision by using an anti-collision function for performing communication by switching the measuring devices 2 to be sequentially output. Specifically, for example, when the monitoring device 1 detects a reply of two or more first reply signals and cannot acquire any of them due to communication collisions, it designates a device ID in a specific range, Request the measuring device 2 to reply again. As a result, when the collision is not resolved, the monitoring device 1 narrows the range of the device ID and requests a reply again. Then, by repeating this, when the communication collision is resolved, that is, when the number of measuring devices 2 that return the first reply signal is one, the monitoring device 1 sends the first reply signal from the measuring device 2 Just get it. Thereafter, the monitoring device 1 may specify a device ID in a specific range excluding the device ID of the measuring device 2 that acquired the first reply signal, and request a response from the remaining measuring devices 2.
In addition, the measuring device 2 that establishes communication first has priority, and the other measuring device 2 waits for the measuring device 2 that communicates first to end communication, and then performs communication. It may be.

(11) In the above-described embodiment, the communication band used for wireless communication is not particularly described. However, in addition to the short wave band, the ultra high frequency band, the ultra high frequency band, and the like, for example, the long wave band such as the LF (Low Frequency) band Can be suitably used. According to the communication system 9 according to the present invention, the communication volume and the possibility of occurrence of communication collision are reduced, so that the problem caused by the communication speed in the long wave band being slower than the communication in the short wave band is solved. . In addition, communication in the long wave band has an advantage that it can propagate over water, soil, metal, and the like, compared to communication in the short wave band, and thus can be applied to various applications.

(12) In the above-described embodiment, the distribution instruction for distributing the first request signal DS1 is performed using an interrupt signal periodically generated by a timer, but may be performed using another timing as a trigger. . For example, the control unit 11 of the monitoring device 1 may generate an interrupt signal according to a schedule stored in advance in the storage unit 12. In this schedule, as the timing for generating an interrupt signal, for example, a plurality of timings determined at non-constant intervals such as 7 am, 8 am, 1 pm, 4 pm, and 10:30 pm May be described. Further, the above distribution instruction may be performed when a user performs an operation via an operation unit (not shown) of the monitoring device 1.

(13) In the above-described embodiment, when the control unit 21 of the measurement device 2 determines that the request signal received from the monitoring device 1 is the first request signal DS1, the measurement unit 24 performs measurement, and the measurement unit 24 It is determined whether or not the numerical value output from the threshold value 222 stored in the storage unit 22 exceeds the threshold value 222. At this time, the latest numerical value among the numerical values already measured and output by the measuring unit 24 is the threshold value 222. You may make it judge whether it exceeds. In this case, the measurement unit 24 may store the latest output value by sequentially overwriting the storage unit 22. That is, the measurement unit 24 may perform measurement continuously regardless of reception instead of performing measurement after receiving the first request signal from the monitoring device 1. Even in this case, the measuring device 2 replies to the first request signal distributed from the monitoring device 1, so that the monitoring device 1 can monitor intermittently.

DESCRIPTION OF SYMBOLS 1 ... Monitoring apparatus, 11 ... Control part, 111 ... Delivery part, 112 ... Transmission part, 113 ... Acquisition part, 12 ... Memory | storage part, 121 ... Monitoring table, 13 ... Communication part, 2, 2a, 2b ... Measuring instrument, 21 ... Control part 211 ... Receiving part 212 ... Determining part 213 ... Reply part 22 ... Storage part 221 ... Device ID 222 ... Threshold value 23 ... Communication part 24 ... Measurement part 3 ... Revetment block 9 ... Communication system, DS1 ... first request signal, DS2 ... second request signal, RS1 ... first reply signal, RS2 ... second reply signal

Claims (10)

A communication system comprising a monitoring device and a plurality of measuring devices,
The monitoring device
Delivery means for delivering a first request signal for requesting a reply to the plurality of measuring devices;
First acquisition means for acquiring a first reply signal returned from the measuring device in response to the first request signal distributed by the distribution means;
Each of the plurality of measuring devices is
A measuring means for measuring physical quantities;
Determination means for determining whether or not the measurement result by the measurement means satisfies a specified condition;
Storage means for storing identification information indicating itself;
First receiving means for receiving the first request signal from the monitoring device;
When the first receiving means receives the first request signal, the first reply signal including the identification information stored in the storage means is determined when the determining means determines that the condition is satisfied. A communication system comprising: a first reply unit that sends a reply to the monitoring device. The distribution means of the monitoring device distributes the first request signal including information specifying the condition,
The communication according to claim 1, wherein the determination unit of the measurement device determines whether the measurement result satisfies a condition specified by the information included in the first request signal. system. The distribution means of the monitoring device distributes the first request signal including the information and identification information of any two or more of the plurality of measuring devices,
The determination unit of the measuring device is designated by the information included in the first request signal when any of the identification information included in the first request signal matches the identification information stored in the storage unit. The communication system according to claim 2, wherein it is determined whether or not the measurement result satisfies the determined condition. The plurality of measuring devices are classified into a plurality of groups,
The measuring device storage means stores group identification information indicating a group to which the group belongs among the plurality of groups,
The distribution means of the monitoring device distributes the first request signal including the information and group identification information of any of the plurality of groups,
The determination unit of the measuring device is designated by the information included in the first request signal when the group identification information included in the first request signal matches the group identification information stored in the storage unit. The communication system according to claim 2, wherein it is determined whether or not the measurement result satisfies the determined condition. The measuring means of the measuring device outputs a numerical value obtained by measuring a physical quantity,
The determination unit of the measuring device, when a difference between a numerical value output by the measuring unit and a numerical value output by the measuring unit before the numerical value exceeds a threshold value, the measurement result satisfies the condition. The communication system according to claim 1, wherein the communication system is determined to be. The monitoring device
Transmitting means for transmitting a second request signal for requesting a response to each of the plurality of measuring devices in accordance with the priority order determined for each measuring device;
Second acquisition means for acquiring a second reply signal returned from the measuring device in response to the second request signal transmitted by the transmission means;
Each of the plurality of measuring devices is
Second receiving means for receiving the second request signal from the monitoring device;
When the second receiving means receives the second request signal, the second receiving means comprises second reply means for returning the second reply signal including the identification information stored in the storage means to the monitoring device. The communication system according to any one of claims 1 to 5. The monitoring device
Generating means for generating a list in which each of the plurality of measuring devices is arranged in descending order of priority;
When the first acquisition unit acquires the first reply signal returned by the measuring device, the measuring device that has returned the first reply signal is excluded from the list generated by the generating unit, or the By changing the list by moving to the lowest priority in the list,
The communication system according to claim 6, wherein the transmission unit of the monitoring device transmits the second request signal in accordance with the priority order in the list changed by the changing unit. When receiving a request signal, a measuring unit that measures a physical quantity, a determining unit that determines whether a measurement result by the measuring unit satisfies a specified condition, a storage unit that stores identification information indicating itself, When the determination unit determines that the condition is satisfied, a reply is sent to each of the plurality of measuring devices including a return unit that returns a return signal including the identification information stored in the storage unit. A distribution means for distributing a request signal to be requested;
A monitoring device comprising: an acquisition unit configured to acquire the reply signal returned from the measuring device in response to the request signal distributed by the distribution unit. A measuring means for measuring physical quantities;
Determination means for determining whether or not the measurement result by the measurement means satisfies a specified condition;
Storage means for storing identification information indicating itself;
Receiving means for receiving the request signal from a monitoring device for distributing a request signal for requesting a reply;
When the receiving means receives the request signal, if the judging means judges that the condition is satisfied, it sends back the reply signal including the identification information stored in the storage means to the monitoring device. A measuring instrument comprising: means. A measuring instrument computer comprising measuring means for measuring a physical quantity, storage means for storing identification information indicating itself, and receiving means for receiving the request signal from a monitoring device for distributing a request signal for requesting a reply,
Determination means for determining whether or not the measurement result by the measurement means satisfies a specified condition;
When the receiving means receives the request signal, if the judging means judges that the condition is satisfied, it sends back the reply signal including the identification information stored in the storage means to the monitoring device. Program to function as a means.

Images