JP2013031014A - Radio sensor network and installation method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio sensor network capable of measuring communication levels among a plurality of radio sensors, with a simple configuration.SOLUTION: A radio sensor network 1 comprises: a plurality of radio sensors 2 individually having identification information; and a communication level display device 3 which selects arbitrary two radio sensors of the plurality of radio sensors 2, and sets one and another of the two sensors as a first test sensor 8 and a second test sensor 9 respectively. The communication level display device 3 makes the first test sensor 8 perform radio transmission of a test signal 22 to the second test sensor 9, by performing radio transmission of a communication level test command 21 to the first test sensor 8. The second test sensor 9 measures a communication level in receiving the test signal 22, and performs radio transmission of the communication level as a communication level measurement result 23 to the communication level display device 3. The communication level display device 3 displays the communication level measurement result 23 as well as the identification information of the selected radio sensors 2.

Description

  The present invention relates to a wireless sensor network that performs wireless communication with a plurality of wireless sensors.

  In plant monitoring of power plants such as nuclear power plants in recent years, a wireless sensor network is constructed by installing multiple wireless sensors in the plant, and measurements are made using thermometers and pressure gauges installed at various locations in the plant. It is assumed that collected plant information is collected in a control panel and a central monitoring room via a wireless sensor network, and is useful for early detection of device abnormality, monitoring of plant behavior, and the like.

  Wireless sensors that transmit data by wireless communication are affected by structures such as walls and pipes that become obstacles to signals. Control, countermeasures such as detouring of data to other wireless sensors are required. Furthermore, the load of the power source necessary for the operation increases, and there is a concern about the influence on the driving period, particularly when the wireless sensor is battery driven. In view of this, the following techniques relating to wireless sensor installation adjustment, such as wireless sensor position change and antenna angle change, have been developed.

  In a wireless telemeter system comprising a wireless master unit and a plurality of wireless slave units, a reception level measurement message is transmitted from the wireless master unit to the wireless slave unit, and a communication level of the reception level measurement message is measured by the wireless slave unit, and a display device, etc. A technique for performing installation adjustment of the wireless master device and the wireless slave device by displaying the measured communication level on the Internet is disclosed (for example, see Patent Document 1).

  A plurality of wireless sensors are temporarily installed, a communication level measurement signal is simultaneously transmitted from a plurality of other wireless sensors to a specific wireless sensor, and the specific wireless sensor receives the measurement signal to communicate with other wireless sensors. Measure each communication level, switch the specific wireless sensor in turn and perform the same measurement, display the communication level between all wireless sensors in a matrix on the measurement PC, and adjust the installation of the wireless sensor The technology used for the above is disclosed (for example, see Patent Document 2).

JP 2003-151062 A JP 2010-45701 A

  Here, the adjustment of the installation position of the wireless sensor is performed by the sensor installer in the site where a plurality of wireless sensors are temporarily installed, while checking the communication level between the two wireless sensors to be adjusted. Is common. However, the technique described in Patent Document 1 described above measures the communication level in one direction from the parent device to the child device, and is installed and adjusted in a wireless sensor network in which a plurality of wireless sensors communicate with each other. The communication level between any two wireless sensors to be measured cannot be measured.

  Furthermore, the technique described in Patent Document 2 described above transmits measurement signals from a plurality of other wireless sensors simultaneously to one specific wireless sensor, and the specific wireless sensor measures each communication level. Therefore, it is not possible to measure the communication level only between any two wireless sensors to be installed and adjusted. Furthermore, a specific wireless sensor receives measurement signals from multiple other wireless sensors, measures the communication level, aggregates each communication level measurement result and sends it to the measurement PC. Since the communication levels between the wireless sensors are displayed in a matrix, the cost for setting and programming each wireless sensor and measurement PC increases, and there is a possibility that the equipment becomes redundant.

  Therefore, an object of the present invention is to provide a wireless sensor network that can measure a communication level between any two wireless sensors with a simple configuration.

  In order to achieve the above object, the wireless sensor network of the present invention selects a plurality of wireless sensors each having identification information, and any two of the plurality of wireless sensors, one being a first test sensor and the other being And a communication level display device that can set the second test sensor as a second test sensor, the communication level display device wirelessly transmits a communication level test command to the first test sensor, and the second test sensor from the first test sensor. The second test sensor wirelessly transmits the test signal to the communication level display device as a result of measuring the communication level when the test signal is received, and the communication level display device communicates from the second test sensor. The level measurement result is wirelessly received, and the communication level measurement result is displayed together with at least the identification information of the second test sensor. .

  In order to achieve the above object, the wireless sensor installation method of the present invention selects any two of a plurality of wireless sensors each having identification information, one as a first test sensor and the other as a second. A step of setting as a test sensor, a step of wirelessly transmitting a test signal from the first test sensor to the second test sensor, a step of receiving a test signal by the second test sensor and measuring a communication level as a communication level measurement result, , Wirelessly receiving the communication level measurement result and displaying the communication level measurement result together with at least the identification information of the second test sensor on the display; and adjusting the installation positions of the first test sensor and the second test sensor based on the communication level measurement result And a step of performing.

  According to the present invention, it is possible to measure the communication level between any two wireless sensors in a wireless sensor network with a simple configuration.

1 is a schematic configuration diagram of a wireless sensor network according to a first embodiment of the present invention. Schematic which shows the example of a display of the communication level display apparatus of the wireless sensor network which concerns on the 1st Embodiment of this invention. The schematic block diagram of the wireless sensor network which concerns on the 2nd Embodiment of this invention. The schematic block diagram which shows rotation operation | movement of the communication antenna of the radio | wireless sensor network which concerns on the 3rd Embodiment of this invention. The schematic block diagram of the radio | wireless sensor network which concerns on the 4th Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
(Constitution)
Hereinafter, a wireless sensor network according to a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a schematic configuration diagram of a wireless sensor network according to the first embodiment of the present invention.

  The wireless sensor network 1 includes a plurality of wireless sensors 2 and a communication level display device 3. FIG. 2 is a schematic diagram illustrating a display example of the communication level display device of the wireless sensor network according to the first embodiment of the present invention. The communication level display device 3 includes a sensor designation unit 4, a test signal transmission command unit 5, a communication level measurement result reception unit 6, and a communication level measurement result display unit 7. The communication level display device 3 has portability, and can display the sensor designating unit 4 and the communication level measurement result receiving unit 6 by a touch panel display capable of displaying and touching. Further, a wireless device that can communicate with the wireless sensor 2 is applied to the test signal transmission command unit 5 and the communication level measurement result display unit 7.

  The plurality of wireless sensors 2 can transmit and receive data by mutual wireless communication. As a communication method of the wireless sensor 2, a communication method such as Bluetooth (registered trademark) or ZigBee (registered trademark) that can construct a wireless PAN (Personal Area Network) by a plurality of wireless sensors 2 can be applied.

  Further, identification information is added to each of the plurality of wireless sensors 2. As the identification information, a manufacturing number or a serial number can be applied. Further, information about the installation location and application of the wireless sensor 2 may be added. By adding the identification information of the transmission source and reception destination wireless sensors 2 to the transmission data, the specific wireless sensor 2 can receive the transmission data, and the transmission destination wireless sensor 2 can be recognized by the reception destination wireless sensor 2. it can. Furthermore, each wireless sensor 2 has a communication level measurement function, and can measure the communication level of a test signal 22 described later.

  In addition, as shown in FIG. 1, by connecting a backbone network 13 to a plurality of wireless sensors 2 via relay stations 11 and base stations 12, data transmitted by the plurality of wireless sensors 2 is transmitted and received on the backbone network 13. can do. Further, the backbone network 13 is connected to the Internet 14 and a server 15 that collects data, and data can be transmitted and received between the Internet 14 and the server 15 and the plurality of wireless sensors 2. With this configuration, for example, as shown in FIG. 1, measurement data of a thermometer installed at a distance is received by the server 15 via the plurality of wireless sensors 2 and the backbone network 13, and the plurality of wireless sensors 2 are transmitted from the backbone network 13. An operation command can be transmitted to an actuator installed far away via the actuator.

  As shown in FIG. 2, the sensor designation unit 4 displays a list of identification information of the plurality of wireless sensors 2, and any two of the plurality of wireless sensors 2 are touched by a touch operation on the touch panel display, one of which is a first test sensor. 8 and the other can be selected as the second test sensor 9.

  The test signal transmission command unit 5 can transmit a communication level test command 21 described later to the first test sensor 8. Further, the communication level measurement result receiving unit 6 can receive a communication level measurement result 23 described later. Further, the communication level measurement result display unit 7 can display the communication level measurement result 23 together with the identification information of the wireless sensor 2 on the touch panel display.

(Function)
The operation of the first embodiment of the present invention will be described below. The sensor installer uses the communication level display device 3 to adjust the installation position of the wireless sensor 2. First, temporary installation of a plurality of wireless sensors 2 is performed. The temporary installation of the wireless sensor 2 is performed in consideration of the propagation distance and signal strength of the wireless signal of the wireless sensor 2. Hereinafter, it is assumed that the wireless sensors 2a, 2b, 2c, 2d, and 2e are temporarily installed at various places as shown in FIG.

  Adjustment of the installation position of the wireless sensor 2 is performed by measuring the communication level between the two wireless sensors 2. The sensor installer places the communication level display device 3 at a position where it can communicate with the two wireless sensors 2 whose positions are to be adjusted. Furthermore, it is desirable that the communication level display device 3 is disposed at a position sandwiched between the two wireless sensors 2 so that the communication level display device 3 can communicate with both of the two wireless sensors 2. Hereinafter, a case where the communication level between the wireless sensor 2c and the wireless sensor 2e among the plurality of wireless sensors 2 is measured will be described.

  As shown in FIG. 2, temporarily installed wireless sensors 2 a, 2 b, 2 c, 2 d, and 2 e are provided in the sensor designation unit 4 of the communication level display device 3, and the identification information is sensor a, sensor b, sensor c, Listed as sensor d and sensor e. Here, as a method of displaying a list of identification information of the temporarily installed wireless sensor 2, a method of inputting identification information of the wireless sensor 2 temporarily installed in the communication level display device 3 in advance is applied. Alternatively, a search signal for searching for the temporarily installed wireless sensor 2 is transmitted by the communication level display device 3, and the temporarily installed wireless sensor 2 sends its identification information to the communication level display device 3 in response to this search signal. The communication level display device 3 may collect the identification information of the wireless sensor 2 by transmitting.

  The sensor installer uses the sensor designating unit 4 of the communication level display device 3 to select the wireless sensor 2 c as the first test sensor 8 and the wireless sensor 2 e as the second test sensor 9 among the plurality of wireless sensors 2. After the selection of the wireless sensor 2, the communication level display device 3 transmits a communication level test command 21 to the first test sensor 8.

  The first test sensor 8 receives the communication level test command 21 from the communication level display device 3 and transmits a test signal 22 to the second test sensor 9. Here, the test signal 22 is a signal for measuring the communication level between the two wireless sensors 2. The communication level is measured by measuring the reception strength of the test signal 22 by the second test sensor 9 and the reception success rate of the test signal 22.

  Here, as a method in which the first test sensor 8 obtains the test signal 22 and transmits it to the second test sensor 9, the communication level display device 3 adds the test signal 22 to the communication level test command 21 and transmits it. A method in which the first test sensor 8 transmits the second test sensor 9 using the test signal 22 received from the communication level display device 3 is applied. Alternatively, the test signal 22 may be stored in advance in the storage device in each wireless sensor 2, and the test signal 22 may be read and transmitted to the second test sensor 9 when the communication level test command 21 is received.

  The second test sensor 9 receives the test signal 22 and measures the communication level using the communication level measurement function. For example, the reception strength of the test signal 22 and the reception success rate of the test signal 22 can be measured as the communication level.

  Further, the second test sensor 9 converts the communication level measurement result into data as the communication level measurement result 23, and transmits the communication level measurement result 23 to the communication level measurement result receiving unit 6 of the communication level display device 3. The communication level measurement result display unit 7 of the communication level display device 3 identifies the wireless sensor 2 selected on the touch panel display using the communication level display device 3 received by the communication level measurement result reception unit 6 as shown in FIG. The communication level measurement result 23 is displayed together with the information. Here, the installation position of the wireless sensor 2 is generally adjusted by fixing the wireless sensor 2 that is the signal transmission source and adjusting the position of the wireless sensor 2 that is the signal reception destination. Therefore, the identification information of the wireless sensor 2 displayed on the touch panel display may be the wireless sensor 2 selected as at least the second test sensor 9 out of the first test sensor 8 and the second test sensor 9.

  The sensor installer confirms the communication level measurement result 23 together with the identification information of the selected wireless sensor 2 on the touch panel display, and performs installation adjustment such as changing the installation position of the two selected wireless sensors 2 or changing the angle of the communication antenna. . After the adjustment, the communication level is measured again, and it is confirmed that the predetermined reference value of the communication level is satisfied, and the installation adjustment is completed.

(effect)
According to the first embodiment of the present invention, a sensor installer is selected by selecting two wireless sensors 2 to be installed and adjusted by the communication level display device 3, measuring the communication level, and displaying them on the touch panel display. However, the communication level of the wireless sensor 2 can be confirmed at the installation site of the wireless sensor 2 and the installation adjustment of the wireless sensor 2 can be performed.

  In the wireless sensor network 1, not only all wireless sensors 2 perform data transmission in the unidirectional direction, but there are also devices that perform data transmission in one direction depending on the installation position and application of the wireless sensor 2. At this time, the wireless sensor 2 that is the data transmission source is selected as the first test sensor 8 and the wireless sensor 2 that is the reception destination is selected as the second test sensor 9, and the communication level is measured.

(Second Embodiment)
(Constitution)
A wireless sensor network according to the second embodiment of the present invention will be described below with reference to FIG. The same parts as those of the wireless sensor network according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted.

  FIG. 3 is a schematic configuration diagram of a wireless sensor network according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that the communication level measurement result receiver 6 of the communication level display device 3 replaces the second test sensor 9 with the communication level measurement result 23 from the first test sensor 8. Is the point to receive.

  As shown in FIG. 3, the second test sensor 9 transmits a communication level measurement result 23 to the first test sensor 8. Further, the first test sensor 8 transmits the communication level measurement result 23 received from the second test sensor 9 to the communication level measurement result receiving unit 6 of the communication level display device 3.

(Function)
The operation of the second embodiment of the present invention will be described below. Similar to the first embodiment, a case where the wireless sensors 2a, 2b, 2c, 2d, and 2e are temporarily installed and the communication level between the wireless sensor 2c and the wireless sensor 2e is measured will be described. The operation up to the selection of the first test sensor 8 and the second test sensor 9 is the same as that in the first embodiment, and thus the description thereof is omitted.

  In the present embodiment, the communication level display device 3 transmits a communication level test command 21 to the first test sensor 8 and receives a communication level measurement result 23 from the first test sensor 8. Therefore, the sensor installer places the communication level display device 3 at a position where it can communicate with the first test sensor 8.

  After the wireless sensor 2 c is selected as the first test sensor 8 and the wireless sensor 2 e is selected as the second test sensor 9 in the sensor designation unit 4, the communication level display device 3 transmits a communication level test command 21 to the first test sensor 8. To do.

  The first test sensor 8 receives the communication level test command 21 from the communication level display device 3 and transmits a test signal 22 to the second test sensor 9. Similar to the first embodiment, the second test sensor 9 receives the test signal 22 and measures the communication level.

  Further, the second test sensor 9 converts the communication level measurement result into data as the communication level measurement result 23 and transmits the communication level measurement result 23 to the first test sensor 8. The first test sensor 8 receives the communication level measurement result 23 and transmits it to the communication level measurement result receiving unit 6 of the communication level display device 3.

  The communication level measurement result display unit 7 of the communication level display device 3 displays the communication level measurement result 23 received by the communication level measurement result reception unit 6 together with the identification information of the wireless sensor 2 on the touch panel display.

  Further, in addition to the measurement of the communication level by transmitting the test signal 22 from the first test sensor 8 to the second test sensor 9 described above, the communication level when the communication level measurement result 23 is received is measured by the first test sensor 8. Also good. In this case, the communication level in reception of the communication level measurement result 23 of the first test sensor 8 is converted into data as the second communication level measurement result 24, and the first test sensor 8 converts the second communication level measurement result 24 into the communication level display device 3. The communication level display device 3 can display the second communication level measurement result 24 in addition to the communication level measurement result 23.

  Note that the measurement of the communication level of the second communication level measurement result 24 not only measures the communication level when the communication level measurement result 23 is received, but also adds a second value from the second test sensor 9 to the first test sensor 8. The test signal may be transmitted and the first test sensor 8 may measure the communication level of the second test signal.

(effect)
According to the second embodiment of the present invention, the communication level display device 3 can measure the communication level between the first test sensor 8 and the second test sensor 9 by communicating with only the first test sensor 8. it can. Therefore, for example, when two wireless sensors 2 are provided on the upper floors of adjacent buildings, two sensor sensors cannot be placed between the first test sensor 8 and the second test sensor 9 in two places. The communication level between the wireless sensors 2 can be measured.

(Third embodiment)
(Constitution)
A wireless sensor network according to the third embodiment of the present invention will be described below with reference to FIG. The same parts as those of the wireless sensor network according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted.

  FIG. 4 is a schematic configuration diagram showing the rotation operation of the communication antenna of the wireless sensor network according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in that the wireless sensor 2 is newly provided with a drive mechanism for rotating the communication antenna, and the communication level display device 3 has a function of newly transmitting the communication antenna drive command 25. It is a point to prepare.

(Function)
The operation of the third embodiment of the present invention will be described below. A signal transmitted from the communication antenna of the wireless sensor 2 may not propagate in all directions but may propagate with directivity. A decrease in the communication level of the wireless sensor 2 may occur when the receiving wireless sensor 2 deviates from the signal propagation range of the transmitting wireless sensor 2.

  Therefore, as a result of measuring the communication level in the above-described embodiment, if the communication level is lower than the reference value, the communication level display device 3 transmits the communication antenna drive command 25 to the first test sensor 8 of the wireless sensors 2. To do.

  The wireless sensor 2c receives the communication antenna drive command 25 and rotates the communication antenna by the drive mechanism. Further, the communication level is measured at the rotation position of the communication antenna which varies depending on the communication level display device 3. The communication level display device 3 receives the communication level measurement result 23, stops the transmission of the communication antenna drive command 25 when the communication level satisfies the reference value, or when the communication level reaches the maximum, and rotates the communication antenna. Stop.

  Furthermore, the receiving wireless sensor 2 may also have directivity in receiving sensitivity. In this case, the communication antenna drive command 25 is transmitted to the wireless sensor 2e selected as the second test sensor 9, the communication antenna is rotated, and the communication antenna is adjusted to a position where the communication level satisfies the reference value.

  Furthermore, navigation is performed on the touch panel display for a series of steps from installation of the wireless sensor 2 to position adjustment including the step of temporarily installing the wireless sensor 2 described above, the step of measuring the communication level, and the step of rotating the communication antenna. It may be displayed. In this case, a description of each process, a notification that the rotation adjustment of the communication antenna is necessary because the communication level is low, and the like are displayed on the touch panel display.

(effect)
According to the third embodiment of the present invention, the wireless antenna can be adjusted to a position with a good communication level by rotating the wireless antenna of the wireless sensor 2 by the communication level display device 3 and measuring the communication level. . Note that a drive mechanism that not only rotates the communication antenna but also expands and contracts or refracts the communication antenna may be applied to the drive mechanism of the wireless sensor 2.

(Fourth embodiment)
(Constitution)
Hereinafter, a wireless sensor network according to a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those of the wireless sensor network according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted.

  FIG. 5 is a schematic configuration diagram showing a wireless sensor network according to the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that a communication level storage device 10 that stores communication level measurement results 23 measured by the communication level display device 3 in time series is provided.

(Function)
The operation of the fourth embodiment of the present invention will be described below. The wireless sensor 2 may change its communication level even after installation adjustment due to changes in surrounding structures and conditions such as temperature and humidity.

  Therefore, the sensor installer periodically measures the communication level of the wireless sensor 2 by the communication level display device 3. The communication level display device 3 stores the communication level measurement results 23 in time series in the internal communication level storage device 10 every time the communication level is measured. The communication level measurement result display unit 7 of the communication level display device 3 displays the time-series communication level measurement results 23 stored in the communication level storage device 10 in a graph on the touch panel display, and further sets a predetermined communication level reference. When it falls below the value, an alarm is notified as a low communication level.

  Further, the wireless sensor 2 may have an abnormality determination function. As an abnormality determination method, a method of detecting a decrease in the capacity of the built-in battery or confirming transmission of a simulated signal can be applied. This abnormality determination function transmits an abnormality determination signal indicating an abnormality when the wireless sensor 2 of the own apparatus is abnormal. The abnormality determination signal is transmitted together with the communication level measurement result 23 at the communication level measurement or spontaneously.

  The communication level display device 3 receives the abnormality determination signal and displays the abnormality along with the identification information of the abnormal wireless sensor 2 on the touch panel display. In this case, in the communication level display device 3, it is possible to distinguish and confirm the decrease in the communication level due to the influence of the surrounding structures described above and the decrease in the communication level due to the failure or deterioration of the wireless sensor 2 itself.

(effect)
According to the fourth embodiment of the present invention, the time series communication level measurement result 23 is stored in the communication level storage device 10 of the communication level display device 3 and is displayed on the touch panel display by the communication level measurement result display unit 7. Thus, the progress of the communication level after the installation of the wireless sensor 2 can be monitored, and the structure, temperature condition, etc. that adversely affect the communication level can be specified.

  Needless to say, the embodiment of the present invention is not limited to the above-described embodiment. For example, the number, communication method, and communication data of the wireless sensors 2 can be changed as appropriate according to the scale and purpose of the network constructed by the wireless sensors 2.

  Furthermore, the sensor designation unit 4 and the communication level measurement result display unit 7 may be configured by a general-purpose personal computer including a display and an input device, as well as configured by display on the touch panel display and a touch operation. In this case, the personal computer has a communication function capable of mutual communication with the wireless sensor 2. The first to fourth embodiments described above can be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Wireless sensor network 2 ... Wireless sensor 3 ... Communication level display apparatus 4 ... Sensor designation | designated part 5 ... Test signal transmission command part 6 ... Communication level measurement result receiving part 7 ... Communication level measurement result display unit 8 ... first test sensor 9 ... second test sensor 10 ... communication level measurement result storage device 11 ... relay station 12 ... base station 13 ... core Network 14 ... Internet 15 ... Server 21 ... Communication level test command 22 ... Test signal 23 ... Communication level measurement result 24 ... Second communication level measurement result 25 ... Communication antenna drive Command

Claims (10)

A plurality of wireless sensors each having identification information;
A communication level display device capable of selecting any two of the plurality of wireless sensors and setting one as a first test sensor and the other as a second test sensor;
The communication level display device wirelessly transmits a communication level test command to the first test sensor, and wirelessly transmits a test signal from the first test sensor to the second test sensor,
The second test sensor measures a communication level in receiving the test signal and wirelessly transmits the communication level measurement result to the communication level display device;
The communication level display device wirelessly receives the communication level measurement result from the second test sensor, and displays the communication level measurement result together with at least the identification information of the second test sensor. . A plurality of wireless sensors each having identification information;
A communication level display device capable of selecting any two of the plurality of wireless sensors and setting one as a first test sensor and the other as a second test sensor;
The communication level display device wirelessly transmits a communication level test command to the first test sensor, and wirelessly transmits a test signal from the first test sensor to the second test sensor,
The second test sensor measures a communication level in receiving the test signal, and wirelessly transmits a communication level measurement result to the first test sensor;
The first test sensor wirelessly transmits the communication level measurement result to the communication level display device,
The wireless sensor network, wherein the communication level display device wirelessly receives the communication level measurement result from the first test sensor and displays it together with at least the identification information of the second test sensor. The first test sensor measures the communication level in reception of the communication level measurement result from the second test sensor, and transmits the communication level measurement result to the communication level display device as a second communication level measurement result;
The wireless sensor network according to claim 2, wherein the communication level display device displays the communication level measurement result and the second communication level measurement result.   4. The wireless sensor network according to claim 1, wherein the communication level is a reception intensity of the test signal received by the second test sensor. 5.   The wireless sensor network according to any one of claims 1 to 3, wherein the communication level is a communication success rate of the test signal received by the second test sensor. The wireless sensor has a drive mechanism that drives a communication antenna that performs data communication,
The communication level display device transmits a communication antenna drive command to the wireless sensor, causes the drive mechanism to drive the communication antenna, measures the communication level, and adjusts the communication antenna to a position that satisfies a reference value. The wireless sensor network according to any one of claims 1 to 5, wherein: The communication level display device further includes a communication level storage device that records the communication level measurement results in time series,
The communication level display device displays the communication level recorded in the communication level storage device in time series, and notifies an alarm when the communication level display device falls below a predetermined reference value of the communication level. The wireless sensor network according to any one of claims 1 to 6. The wireless sensor further has an abnormality determination function for transmitting an abnormality determination signal indicating an abnormality at the time of own abnormality,
The wireless sensor network according to claim 1, wherein the communication level display device receives the abnormality determination signal and displays the abnormal wireless sensor together with the identification information. . The communication level display device transmits a search signal for detecting a plurality of the wireless sensors,
The wireless sensor transmits the identification information as a response to the search signal to the communication level display device,
The wireless sensor network according to any one of claims 1 to 8, wherein the communication level display device displays the identification information of the wireless sensor. Selecting any two of a plurality of wireless sensors each having identification information, setting one as a first test sensor and the other as a second test sensor;
Wirelessly transmitting a test signal from the first test sensor to the second test sensor;
Receiving the test signal by the second test sensor and measuring a communication level as a communication level measurement result; and
Wirelessly receiving the communication level measurement result and displaying the communication level measurement result together with at least the identification information of the second test sensor on a display;
And a step of adjusting the installation of the first test sensor and the second test sensor based on the communication level measurement result.

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