JP2018182424A - Air conditioner, air conditioning system, and communication quality measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and appropriately measure the communication quality of an air conditioning system. A data transmission / reception unit 343 receives a control command from another air conditioner. The waveform feature amount detection unit 340 detects the waveform feature amount of the communication signal in the received control command, and the waveform feature amount data in which the detected waveform feature amount is associated with the identification information of the other air conditioner is used as the waveform feature amount. Save in table 321. The data notification unit 341 generates communication quality data for notifying the centralized monitoring device of the communication quality at a predetermined timing based on the measurement result table 321 and instructs the data transmission / reception unit 343 to transmit the communication quality data. [Selection diagram] FIG. 4

Description

  The present invention relates to a technology for measuring communication quality of an air conditioning system.

  For example, when newly constructing an air conditioning system in which a plurality of air conditioners are connected, a technique has been proposed for the purpose of making it easy to discover the presence or absence of transmission abnormality (for example, Patent Document 1).

  In the air conditioning system in which the ratio between the sum of the indoor air conditioning capacities of the plurality of indoor units and the sum of the outdoor air conditioning capacities of the plurality of outdoor units has a predetermined relationship, Patent Document 1 describes information about the indoor air conditioning capacity. It is disclosed that the presence or absence of transmission abnormality is determined by acquiring information on the outdoor air conditioning capacity and comparing the sum of the indoor air conditioning capacity calculated based on the acquired information with the sum of the outdoor air conditioning capacity. .

JP 2012-127552 A

  However, in the technology disclosed in Patent Document 1 described above, although occurrence of transmission abnormality (that is, communication abnormality) can be detected, communication quality including a state in which communication is not good, ie, a state in which communication abnormality is expected in the future Communication quality can not be detected.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide an air conditioner and the like capable of easily and appropriately measuring communication quality in an air conditioning system to which a plurality of air conditioners are connected. I assume.

In order to achieve the above object, an air conditioner according to the present invention is:
Command receiving means for receiving control commands from other air conditioners;
A waveform feature amount detection unit that detects waveform feature amounts of communication signals in the received control command, and stores waveform feature amount data in which the detected waveform feature amounts are associated with identification information of the other air conditioner in a data table When,
And a waveform feature amount transmitting unit that transmits the waveform feature amount data stored in the data table to the centralized monitoring device at a predetermined timing.

  According to the present invention, the waveform feature amount of the communication signal in the control command received from another air conditioner is detected, and the waveform feature amount data in which the detected waveform feature amount is associated with the identification information of the other air conditioner Send to the central monitoring device. Therefore, communication quality in the air conditioning system can be easily and appropriately measured.

A diagram showing an overall configuration of an air conditioning system according to an embodiment of the present invention Block diagram showing the configuration of the air conditioner according to the present embodiment The figure for demonstrating the secondary storage apparatus with which the air conditioner of this embodiment is provided Block diagram showing the functional configuration of the control unit provided in the air conditioner of the present embodiment The figure which shows the example of a waveform of the control command in this embodiment. The figure for demonstrating the case where a pulse width is detected as a waveform feature-value in this embodiment. A flowchart showing the procedure of communication quality measurement processing executed by the air conditioner of the present embodiment Block diagram showing the configuration of the centralized monitoring apparatus according to the present embodiment A diagram showing a display example (No. 1) of diagnosis results of communication quality in the present embodiment A diagram showing a display example (No. 2) of diagnosis results of communication quality in the present embodiment

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing the configuration of an air conditioning system 1 according to an embodiment of the present invention. The air conditioning system 1 is, for example, a system capable of centrally managing air conditioning of a building such as an office building, and includes a centralized monitoring device 2 and a plurality of air conditioners 3 as shown in FIG.

  The central monitoring device 2 and each of the plurality of air conditioners 3 are connected to be communicable via the communication line 4.

  Each of the plurality of air conditioners 3 is any of an outdoor unit, an indoor unit, and a remote control, and as shown in FIG. 2, the communication interface 30, the main unit 31, the secondary storage device 32, and the waveform acquisition unit 33. And a control unit 34.

  The communication interface 30 includes an interface for communicating with the central monitoring device 2 and other air conditioners 3 via the communication line 4. The main unit 31 is a component for realizing the inherent function of the air conditioner 3. When the air conditioner 3 is an outdoor unit, the main unit 31 includes a compressor, a condenser, an expansion valve, an evaporator, and the like. When the air conditioner 3 is an indoor unit, the main unit 31 includes a fan, a heat exchanger, a temperature sensor, and the like. When the air conditioner 3 is a remote control, the main unit 31 includes a user interface device, more specifically, an input device such as a push button, a touch panel, or a touch pad, and a display such as an organic EL display or a liquid crystal display. Be

  The secondary storage device 32 is composed of, for example, an EEPROM (Electrically Erasable Programmable Read-Only Memory), a readable / writable nonvolatile semiconductor memory such as a flash memory. As shown in FIG. 3, the secondary storage device 32 stores a communication quality measurement program 320 and a waveform feature amount table 321. In addition to the above, the secondary storage device 32 stores various programs related to the operation of the main unit 31 and data used when the programs are executed.

  The communication quality measurement program 320 is a computer program executed by the control unit 34. The communication quality measurement program 320 describes a process for measuring the quality (ie, communication quality) in communication with another air conditioner 3 and transmitting the measured communication quality to the central monitoring device 2.

  The waveform feature amount table 321 is a data table for storing waveform feature amounts of communication data received from other air conditioners 3 in association with information identifying the air conditioner 3 of the other party.

  Returning to FIG. 2, the waveform acquisition unit 33 acquires communication data related to air conditioning control, that is, waveform data of a control command, which is received from another air conditioner 3 via the communication interface 30. The waveform acquisition unit 33 includes, for example, a digital oscilloscope, and outputs the acquired waveform data to the control unit 34.

  The control unit 34 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like (none of which is shown), and centrally controls the air conditioner 3. The control unit 34 functionally includes, as shown in FIG. 4, a waveform feature amount detection unit 340, a data notification unit 341, a relay destination search unit 342, a data transmission / reception unit 343, and an air conditioning control unit 344. Prepare. These functional units are realized by the CPU executing the communication quality measurement program 320 stored in the secondary storage device 32.

  The waveform feature amount detection unit 340 is an example of a waveform feature amount detection unit provided in the air conditioner according to the present invention. The waveform feature amount detection unit 340 detects a waveform feature amount from the waveform data acquired by the waveform acquisition unit 33. In detail, the waveform feature amount detection unit 340 detects the maximum value of the amplitude, that is, the peak value from the above-described waveform data (see FIG. 5). In the air conditioning system 1, each air conditioner 3 serially communicates control commands related to air conditioning control. For example, between the air conditioners 3, communication signals in which control commands are encoded in a manner as shown in (a) to (c) of FIG. 5 are transmitted.

  The waveform feature amount may be a pulse width. When a normal communication interface such as the communication interface 30 receives a control command, it detects the edge of the start of the first bit of the received signal, and determines the level of the received signal at a predetermined timing for each bit from the point of edge detection. , Bit judgment. On the other hand, as shown in FIG. 6, the waveform feature amount detection unit 340 determines the level of the received signal by the predetermined number of times (for example, eight times) of the period in which the pulse originally exists, and pulses the rate detection level. Calculated as the width. FIG. 6 shows an example of the RZ method, where (a) is 8/8 of the pulse width and normal, (b) is 4/8 of the pulse width and waveform rounding occurs. (C) shows the case where the pulse width is 6/8 and noise is generated.

  The waveform feature quantity detection unit 340 is a waveform feature quantity in which the waveform feature quantity detected as described above is associated with information (hereinafter referred to as a device ID (identification)) for identifying the air conditioner 3 of the communication counterpart. The data is stored in the waveform feature amount table 321.

  The data notification unit 341 is an example of a waveform feature amount transmission unit provided in the air conditioner according to the present invention. The data notification unit 341 notifies the centralized monitoring device 2 of the communication quality between itself (the air conditioner 3) and the other air conditioners 3 at a predetermined timing. In detail, the data notification unit 341 generates communication quality data for notifying the centralized monitoring device 2 of the detected waveform feature amount periodically (for example, every predetermined time or every predetermined time). , And instructs the data transmission / reception unit 343 to transmit. The communication quality data includes a transmission destination ID, information indicating that the communication quality is notified, and waveform feature amount data stored in the waveform feature amount table 321. The data notification unit 341 determines whether or not direct communication with the central monitoring device 2 can be performed, and sets the device ID of the central monitoring device 2 as the transmission destination ID when direct communication can be performed.

  On the other hand, when it is not possible to directly communicate with the central monitoring device 2 due to a wiring error or the like, the data notification unit 341 instructs the relay destination search unit 342 to search for the air conditioner 3 to be the relay destination of communication quality data. Whether direct communication can be performed is determined, for example, based on whether or not a reception response is returned from the central monitoring device 2 within a predetermined time when communication quality data is first transmitted to the central monitoring device 2. Alternatively, each air conditioner 3 periodically performs a communication check with the central monitoring device 2, and the data notification unit 341 can directly communicate with the central monitoring device 2 based on the result of the latest communication check. May be determined.

  The relay destination search unit 342 is an example of relay destination search means provided in the air conditioner according to the present invention. The relay destination search unit 342 searches for the air conditioner 3 that can communicate directly with the central monitoring device 2, which is another air conditioner 3 that can communicate with the relay device. For example, the relay destination search unit 342 sequentially inquires one or more other air conditioners 3 with which it can communicate, whether direct communication with the central monitoring device 2 is possible or not. Then, when a response to the effect that direct communication is possible is returned in response to the inquiry, the relay destination search unit 342 notifies the data of the device ID of the other air conditioner 3 of the response source as the relay destination search result. Respond to section 341.

  If another air conditioner 3 that can directly communicate with the central monitoring device 2 can not be searched, the relay destination search unit 342 responds to the data notification unit 341 that there is no corresponding air conditioner 3.

  When the relay destination search unit 342 responds with the device ID, the data notification unit 341 sets the device ID as a transmission destination ID in the communication quality data, and instructs the data transmission / reception unit 343 to transmit. On the other hand, when there is a response from the relay destination search unit 342 that there is no corresponding air conditioner 3, the data notification unit 341 causes the LED included in the air conditioner 3 to emit light in a predetermined mode, or the air conditioner 3 Error notification such as outputting an electronic sound from a speaker provided in At that time, when the air conditioner 3 is a remote control, a message may be displayed on the display to the effect that an error has occurred.

  Further, when the data transmission / reception unit 343 receives communication quality data from another air conditioner 3, the data notification unit 341 transfers the communication quality data to the central monitoring device 2. Specifically, the data notification unit 341 updates the transmission destination ID of the communication quality data to the device ID of the central monitoring device 2, and instructs the data transmission / reception unit 343 to transmit.

  In addition, whether the data notification unit 341 can directly communicate with the central monitoring device 2 when the data transmission / reception unit 343 receives the above inquiry (hereinafter referred to as inquiry data) from another air conditioner 3 A response indicating whether or not it is not transmitted is transmitted to the air conditioner 3 of the inquiry source via the data transmission / reception unit 343.

  The data transmitting / receiving unit 343 is an example of a command receiving unit provided in the air conditioner according to the present invention and a waveform feature amount receiving unit. The data transmission / reception unit 343 receives a control command or communication quality data from another air conditioner 3 via the communication interface. The data transmission / reception unit 343 supplies the received control command to the air conditioning control unit 344. Further, as described above, the data transmission / reception unit 343 supplies the received communication quality data to the data notification unit 341.

  Furthermore, the data transmission / reception unit 343 transmits the control command generated by the air conditioning control unit 344 to another air conditioner 3 via the communication interface 30. In addition, as described above, the data transmission / reception unit 343 transmits the communication quality data generated by the data notification unit 341 to the central monitoring device 2 or another air conditioner 3 via the communication interface 30. Furthermore, the data transmission / reception unit 343 transmits the communication quality data whose transmission destination ID has been updated by the data notification unit 341 to the central monitoring device 2 via the communication interface 30.

  When the air conditioning control unit 344 receives the supply of the control command from the data transmitting / receiving unit 343, the air conditioning control unit 344 instructs the main unit 31 to operate according to the content of the control command. In addition, the data transmission / reception unit is configured to generate a control command according to an operation instruction from the main unit 31 (for example, an operation instruction according to the user's operation) and transmit it to another air conditioner 3 that is the target of the operation instruction. Indicate to 343.

  FIG. 7 is a flowchart showing the procedure of the communication quality measurement process executed by each air conditioner 3. If the data transmission / reception unit 343 has not received a control command from another air conditioner 3 via the communication interface 30 (step S101; NO), the process proceeds to step S106. On the other hand, when the data transmission / reception unit 343 receives a control command from another air conditioner 3 (step S101; YES), the waveform acquisition unit 33 acquires waveform data of the control command (step S102). The waveform feature amount detection unit 340 detects the waveform feature amount from the acquired waveform data (step S103), and the waveform feature amount data in which the detected waveform feature amount is associated with the device ID of the air conditioner 3 of the transmission source It is stored in the waveform feature amount table 321 (step S104).

  After step S104, the air conditioning control unit 344 instructs the main unit 31 to perform an operation according to the control command (step S105). Thereafter, the process returns to step S101.

  If the data transmission / reception unit 343 has not received communication quality data from another air conditioner 3 via the communication interface 30 (step S106; NO), the process proceeds to step S108. On the other hand, when the data transmission / reception unit 343 receives communication quality data from another air conditioner 3 (step S106; YES), the data notification unit 341 monitors the communication quality data centrally via the data transmission / reception unit 343. (Step S107). Thereafter, the process returns to step S101.

  If the data transmission / reception unit 343 has not received inquiry data from another air conditioner 3 via the communication interface 30 (step S108; NO), the process proceeds to step S110. On the other hand, when the data transmission / reception unit 343 receives inquiry data from another air conditioner 3 (step S108; YES), the data notification unit 341 responds that indicates whether or not the own device can directly communicate with the central monitoring device 2. Are returned to the inquirer air conditioner 3 (step S109). Thereafter, the process returns to step S101.

  In step S110, the data notification unit 341 determines whether it is a notification timing of communication quality data. For example, the data notification unit 341 may determine that it is the notification timing of the communication quality data when a predetermined time has elapsed since the communication quality data generated by the own device was transmitted last time, or the current time is When a predetermined time comes, it may be determined that it is the notification timing of the communication quality data.

  When it is not the notification timing of the communication quality data (step S110; NO), the process returns to step S101. On the other hand, when it is the notification timing of the communication quality data (step S110; YES), the data notification unit 341 generates communication quality data as described above, and the centralized monitoring device 2 or other via the data transmission / reception unit 343 It transmits to an air conditioner (step S111). Thereafter, the process returns to step S101.

  Subsequently, the central monitoring device 2 will be described. The central monitoring device 2 is installed at a place where no one other than the person concerned can enter, such as a control room in the building. As shown in FIG. 8, the central monitoring device 2 includes a display 20, an input device 21, a communication interface 22, a secondary storage device 23, and a control unit 24.

  The display 20 is configured of, for example, a CRT display, a liquid crystal display, an organic EL display, a plasma display, or the like. The display 20 displays information on the communication quality of the air conditioning system 1 under the control of the control unit 24.

  The input device 21 includes, for example, a keyboard, a mouse, a keypad, a touch pad, a touch panel, and the like. The input device 21 receives an operation by a manager or the like, and sends a signal related to the received operation to the control unit 24. When the input device 21 is a touch panel, it is installed on the display 20.

  The communication interface 22 is an interface for communicating with each of the plurality of air conditioners 3 via the communication line 4.

  The secondary storage device 23 is configured to include an EEPROM (Electrically Erasable Programmable Read-Only Memory), a readable / writable nonvolatile semiconductor memory such as a flash memory, an HDD (Hard Disk Drive), and the like. The secondary storage device 23 stores a communication quality diagnosis program 230 and a collected data table 231.

  The communication quality diagnosis program 230 is a computer program executed by the control unit 24. The communication quality diagnosis program 230 describes a process for diagnosing the communication quality of the air conditioning system 1. The collected data table 231 is a data table for storing communication quality data collected from each air conditioner 3.

  The control unit 24 is configured to include a CPU, a ROM, a RAM, and the like (none of which are shown), and centrally controls the central monitoring device 2. The control unit 24 functionally includes a communication quality data collection unit 240, a communication quality diagnosis unit 241, and a diagnosis result output unit 242. These functional units are realized by the CPU executing the communication quality diagnosis program 230 stored in the secondary storage device 23.

  The communication quality data collection unit 240 receives the communication quality data sent from each air conditioner 3 as described above, and stores the communication quality data in the collection data table 231.

  The communication quality diagnosis unit 241 is an example of a communication quality diagnosis unit included in the central monitoring device according to the present invention. The communication quality diagnosis unit 241 diagnoses the communication quality in the air conditioning system 1 based on the communication quality data from each air conditioner 3 stored in the collected data table 231. Specifically, the communication quality diagnosis unit 241 sequentially picks up the waveform feature amount from each of one or more waveform feature amount data included in the communication quality data from each air conditioner 3 and compares the waveform feature amount with a predetermined threshold value. For example, when the waveform feature amount is a peak value, the threshold indicates the lower limit of the peak value at which the communication quality is considered to be good. The lower limit of the peak value is an arbitrary design item. If the wave height value picked up is smaller than the threshold value, the communication quality diagnosis unit 241 determines that the communication quality between the air conditioners 3 (that is, the pair of the air conditioners 3) is not good.

  Alternatively, when the waveform feature amount is a pulse width, the threshold indicates the lower limit of the pulse width (that is, the rate of level detection) at which communication quality is considered to be good. The lower limit of the pulse width is an arbitrary design matter. If the pulse width picked up is smaller than the threshold, the communication quality diagnosis unit 241 determines that the communication quality between the air conditioners 3 (that is, the pair of the air conditioners 3) is not good.

  Furthermore, when there are a plurality of pairs of air conditioners 3 determined that communication quality is not good, and there are overlapping air conditioners 3 in different pairs, the communication quality diagnosis unit 241 causes the air conditioner 3 to have poor communication quality. Identify as

  The diagnosis result output unit 242 is an example of a diagnosis result output unit included in the centralized monitoring apparatus according to the present invention. The diagnosis result output unit 242 outputs the diagnosis result of the communication quality diagnosis unit 241 to the display 20 for display (see FIGS. 9 and 10). Further, the diagnosis result output unit 242 may transmit the diagnosis result of the communication quality diagnosis unit 241 to another device connected via the communication interface 22 or an interface (not shown) different from the communication interface 22.

  As described above, in the air conditioning system 1 according to the embodiment of the present invention, each air conditioner 3 detects a waveform feature amount when receiving a control command from another air conditioner 3, and the detected waveform feature amount Measurement data in which the device ID of the air conditioner 3 of the communication partner is associated is stored in the waveform feature amount table 321. Then, each air conditioner 3 transmits communication quality data in which the contents stored in the waveform feature amount table 321 are stored to the central monitoring device 2 at a predetermined timing (for example, periodically). For this reason, the central monitoring device 2 can easily collect data related to the communication quality between the air conditioners 3.

  Further, the centralized monitoring device 2 diagnoses communication quality based on communication quality data by each air conditioner 3, that is, one or more waveform feature amounts detected by each air conditioner 3. As a result, not only the communication abnormality but also the communication can be detected but the poor state can be detected, so that the user can grasp the air conditioner 3 to be careful in advance, and can take appropriate preliminary measures.

  Further, since communication can be performed indirectly with the centralized monitoring device 2 via another air conditioner 3, communication with the centralized monitoring device 2 can not be performed directly due to a communication failure due to a wiring error, disconnection or the like. However, each air conditioner 3 can notify the central monitoring device 2 of communication quality data.

  The present invention is not limited to the above embodiment, and various modifications can of course be made without departing from the scope of the present invention.

  For example, each air conditioner 3 stores, in the secondary storage device 32, data in which the number of retransmissions until the control command is normally received by the communication counterpart and the device ID of the air conditioner 3 of the communication counterpart are associated. It may be stored in a retransmission number management table (not shown), and such data may also be included in the communication quality data. In this way, the centralized monitoring device 2 can easily identify the air conditioner 3 whose communication quality is unstable. In addition, each air conditioner 3 secondary-stores data in which a transmission error has been made even when resending has occurred a certain number of times, the data indicating that the transmission error has occurred and the device ID of the air conditioner 3 of the communication counterpart. It may be stored in a transmission error management table (not shown) stored in the device 32, and such data may be included in the communication quality data. In this way, the centralized monitoring device 2 can easily identify the air conditioner 3 whose communication quality is poor.

  In addition, any one air conditioner 3 may collect communication quality data from one or more other air conditioners 3 to diagnose communication quality in the air conditioning system 1.

  Also, in each air conditioner 3, the relay destination search unit 342 is another air conditioner 3 that can communicate with its own device, and when there is no air conditioner 3 that can directly communicate with the central monitoring device 2, it can communicate with its own device It may be another air conditioner 3 that can communicate indirectly with the central monitoring device 2. In this case, when the air conditioner 3 which can not communicate directly with the central monitoring device 2 but can indirectly communicate with it, when it receives communication quality data from another air conditioner 3, the air conditioner 3 can directly communicate the communication quality data with the central monitoring device 2 Transfer to the air conditioner 3.

  In the above embodiment, the communication quality measurement program 320 stored in the secondary storage device 32 is executed by the control unit 34 in each air conditioner 3 so that each functional unit of the control unit 34 (see FIG. 4) Was realized. Further, in the central monitoring device 2, each function unit (refer to FIG. 8) of the control unit 24 is realized by the communication quality diagnosis program 230 stored in the secondary storage device 23 being executed by the control unit 24. .

  However, all or part of the functional units of the control unit 34 of each air conditioner 3 may be realized by dedicated hardware. Similarly, all or part of the functional units of the control unit 24 of the central monitoring device 2 may be realized by dedicated hardware. The dedicated hardware is, for example, a single circuit, a complex circuit, a programmed processor, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination thereof.

  In the above embodiment, the communication quality diagnostic program 230 executed by the control unit 24 of the centralized monitoring device 2 may be a compact disc read only memory (CD-ROM), a digital versatile disc (DVD), a magneto-optical disc (Magneto- It is also possible to store and distribute in a computer readable recording medium such as an optical disc), a universal serial bus (USB) memory, a memory card, an HDD and the like. Then, by installing the communication quality diagnostic program 230 distributed in this manner in a specific or general purpose computer, it is also possible to make the computer function as the central monitoring device 2 in the above embodiment.

  Alternatively, the communication quality diagnostic program 230 may be stored in a disk device or the like of another server on the Internet, and the communication quality diagnostic program 230 may be downloaded from the server to the central monitoring device 2.

  The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope. In addition, the embodiment described above is for describing the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. And, various modifications applied within the scope of the claims and the meaning of the invention are considered to be within the scope of the present invention.

  Reference Signs List 1 air conditioning system 2 centralized monitoring device 3 air conditioner 4 communication line 20 display 21 input device 22 30 communication interface 23 32 secondary storage device 24 34 control unit 31 main unit 33 waveform Acquisition unit, 230 communication quality diagnosis program, 231 collection data table, 240 communication quality data collection unit, 241 communication quality diagnosis unit, 242 diagnosis result output unit, 320 communication quality measurement program, 321 waveform feature amount table, 340 waveform feature amount detection Unit, 341 data notification unit, 342 relay destination search unit, 343 data transmission / reception unit, 344 air conditioning control unit

Claims (6)

Command receiving means for receiving control commands from other air conditioners;
A waveform feature amount detection unit that detects waveform feature amounts of communication signals in the received control command, and stores waveform feature amount data in which the detected waveform feature amounts are associated with identification information of the other air conditioner in a data table When,
An air conditioner, comprising: waveform feature amount transmission means for transmitting waveform feature amount data stored in the data table to a centralized monitoring device at a predetermined timing.   The air conditioner according to claim 1, wherein the waveform feature amount detection means detects a peak value or a pulse width as the waveform feature amount. Waveform feature amount receiving means for receiving waveform feature amount data from another air conditioner;
And relay destination searching means for searching for another air conditioner that can directly communicate with the central monitoring device,
The waveform feature amount transmission means
When it is not possible to directly communicate with the centralized monitoring device, the waveform feature data stored in the data table is transmitted to the other air conditioners searched by the relay destination searching means,
The air conditioner according to claim 1 or 2, wherein when waveform feature data from another air conditioner is received by the waveform feature receiver, the waveform feature data is transferred to the centralized monitoring device. A centralized monitoring device, and a plurality of air conditioners according to any one of claims 1 to 3.
The centralized monitoring device
Communication quality diagnostic means for diagnosing communication quality between air conditioners based on waveform feature amount data sent from each of the plurality of air conditioners;
An diagnostic result output unit that outputs the diagnostic result of the communication quality diagnostic unit to a display.   5. The communication quality diagnostic means according to claim 4, wherein the communication quality between the air conditioners is not good when the waveform feature amount included in the waveform feature amount data is smaller than a predetermined threshold. Air conditioning system. Receive control commands from other air conditioners,
The waveform feature quantity of the communication signal in the received control command is detected, and the waveform feature quantity data in which the detected waveform feature quantity is associated with the identification information of the other air conditioner is stored in the data table.
The communication quality measuring method which transmits the waveform feature-value data preserve | saved at the said data table to a centralized monitoring apparatus at a predetermined timing.

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