CN103837820A - Communication detecting method and system for electric current loop communication circuit - Google Patents
Communication detecting method and system for electric current loop communication circuit Download PDFInfo
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Abstract
The invention is applied to the field of communication detection of an air-conditioning system and provides a communication detecting method and system for a current loop communication circuit. It is judged whether the receiving end, on the indoor side or outdoor side, of the circuit loop communication circuit receives air-conditioner regular communication data when a sending end photocoupler on the indoor side or the outdoor side of the current loop communication circuit is controlled to be powered on, if the air-conditioning regular communication data are not received, the sending end photorcoupler on the indoor side or outdoor side of the current loop communication circuit is controlled to be powered off after delay, detecting frequency data preset in storage space are updated, if the detecting frequency data equals a preset frequency threshold value, it is indicated that the wiring mode of the current loop communication circuit is false, and an air conditioner can send out fault prompt and end communication progress between the indoor side and the outdoor side of the air conditioner, so that the current loop communication circuit stops working, and the aim of protecting control panels of an indoor unit and an outdoor unit of the air conditioner against damage is achieved.
Description
Technical field
The invention belongs to air-conditioning system communication detection field, relate in particular to a kind of communication detecting method and system of current-loop communication circuit.
Background technology
Electric current loop communication is size by detecting electric current in current loop or noly has On current and correspondingly realize a kind of method of communication, the antijamming capability of current-loop communication circuit is strong, communication wire is few, so be widely used in Industry Control and household electrical appliances control field, and current domestic air conditioning generally adopts above-mentioned current-loop communication circuit (current-loop communication circuit of single phase poaer supply as shown in Figure 1) to carry out Communication Control to indoor set and off-premises station.Alternating current carries out half-wave rectification by diode D3 to alternating current in indoor communicating circuit side, carried out providing for electric current loop after voltage stabilizing processing again the DC voltage of 24V by voltage stabilizing diode ZD1, indoor communicating circuit side and outdoor communicating circuit side are opened immediately communication work in the time powering on, now optocoupler (IC7 and the IC8) conducting of the outside of the optocoupler of the indoor of current-loop communication circuit (IC5 and IC6) and current-loop communication circuit, electric current loop is communicated with thereupon, 24V voltage forms current lead-through in current loop, and the optocoupler control chip of indoor set and the optocoupler control chip of off-premises station can detect high level voltage by the receiving end RX2 of the receiving end RX1 of indoor communicating circuit side and outdoor communicating circuit side respectively, if communication is closed, due to the optocoupler cut-off in indoor communicating circuit side or outdoor communicating circuit side, current loop is closed thereupon and is passed through without On current, and the optocoupler control chip of indoor set and the optocoupler control chip of off-premises station can detect low level voltage by the receiving end RX2 of the receiving end RX1 of indoor communicating circuit side and outdoor communicating circuit side respectively.Therefore, realize the transmission of communication data by the method for above-mentioned detection low and high level.
The air-conditioning of supplying with for single phase poaer supply, its current-loop communication circuit is as long as 4 lines (comprising phase line L, zero line N, connection S and ground wire GND) can be realized, and the wiring diagram of its indoor and outdoor both sides is as shown in Figure 2; The air-conditioning of supplying with for three-phase supply, its current-loop communication circuit needs 6 lines (comprising a phase power lead A, two-phase power lead B, three-phase power line C, zero line N, connection S and ground wire GND) just can realize, and the wiring diagram of its indoor and outdoor both sides as shown in Figure 3.
Because the mode of connection of the indoor and outdoor both sides of current most of air-conditioning is by being that producer provides, on its every connecting line, there is corresponding mark, and corresponding indoor apparatus of air conditioner and the junction block of off-premises station also have corresponding mark, in the time installing an air-conditioner, only need to be connected according to the mark of the mark of connecting line and junction block, so wiring error rate is very low.
But for the comparatively special air-conditioning of part mounting means (as ceiling machine), because its mounting means is special, and producer does not provide the connecting line of indoor and outdoor both sides, need in the time buy air-conditioning, provide or buy voluntarily connecting line by user by dealer, and owing to not identifying on these connecting lines, so be easy to wrong line in the time that indoor set is connected with off-premises station, make the connectivity port correspondence one by one of indoor and outside, and then cause the control panel of indoor apparatus of air conditioner and off-premises station to be damaged.For example, Wrong wiring way as shown in Figure 4 and Figure 5, because phase line L or three-phase power line C are connected to connection S, the voltage effective value between zero line N and connection S end reaches 220V, this magnitude of voltage is considerably beyond aforesaid 24V, so, for outside, in the time of optocoupler control chip control optocoupler IC8 conducting, because the voltage between zero line N and connection S increases severely, the On current of optocoupler IC8 increases greatly, exceed the electric conduction flow valuve that it can bear, optocoupler IC8 is damaged at short notice, in like manner also can be because of above-mentioned former thereby be damaged to indoor optocoupler IC6, and then damaging appears in the control panel that causes indoor and outdoor both sides.
Summary of the invention
The object of the present invention is to provide a kind of communication detecting method of current-loop communication circuit, be intended to solve the problem that existing current-loop communication circuit can cause the control panel of indoor and outdoor both sides to be damaged in the time that the mode of connection of indoor and outdoor both sides is made mistakes.
The present invention is achieved in that a kind of communication detecting method of current-loop communication circuit, and described communication detecting method comprises the following steps:
A. in the time of power-on of air conditioner, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, the detection time logarithmic data of storing in the default storage space of initialization, and time delay very first time interval;
B. control the transmitting terminal optocoupler conducting of indoor or the outside of current-loop communication circuit;
C. judge whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, are, perform step H, no, perform step D;
D. judge whether the indoor of described current-loop communication circuit or the receiving end of outside continue to receive the conventional communication data of non-air-conditioning within second time interval, are, perform step E, no, jump to described step C;
E. control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and upgrade the detection time logarithmic data in default storage space;
F. timing generate chronometric data, and judge whether described detection time logarithmic data equals preset times threshold value, is, performs step I, no, perform step G;
G. judge whether described chronometric data equaled for the 3rd time interval, was, performed step H, no, described step G is returned in redirect;
H. controlling air conditioner chamber inner side opens interprocess communication and jumps to described step B with outside;
I. send fault prompting, finish the interprocess communication between air conditioner chamber inner side and outside.
The present invention also provides a kind of communication detection system of current-loop communication circuit, and described communication detection system comprises:
Power-up initializing module, optocoupler control module, the first data receiver judge module, the second data receiver judge module, redirect module, optocoupler control and counting module, timing and counting judge module, timing judge module, system control module, fault processing module and memory module;
Described power-up initializing module for controlling the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, the detection time logarithmic data in the default storage space of initialization, and time delay very first time interval in the time of power-on of air conditioner;
Described optocoupler control module is used for the transmitting terminal optocoupler conducting of indoor or the outside of controlling current-loop communication circuit;
Described the first data receiver judge module is for judging whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning;
Described the second data receiver judge module, for when the judged result of described the first data receiver judge module is while being no, judges whether the indoor of described current-loop communication circuit or the receiving end of outside continue to receive non-air-conditioning routine communication data within second time interval;
Described redirect module is for jumping to described the first data receiver judge module while being no when the judged result of described the second data receiver judge module;
Described optocoupler control and counting module, for when the judged result of described the second data receiver judge module is when being, are controlled the indoor of current-loop communication circuit or the transmitting terminal optocoupler of outside and are ended, and upgrade the inferior logarithmic data of detection in described memory module;
Described timing is used for timing and generates chronometric data with counting judge module, and judges whether described detection time logarithmic data equals preset times threshold value;
Described timing judge module, for when described timing is when to count the judged result of judge module be no, judges whether described chronometric data equaled for the 3rd time interval;
Described system control module for when the judged result of described the first data receiver judge module be or the judged result of described timing judge module when being, control air conditioner chamber inner side and outside unlatching interprocess communication also jumps to described optocoupler control module;
Described fault processing module for when described timing with the judged result of counting judge module when being, send fault prompting, the interprocess communication inside end air conditioner chamber and between outside;
Described memory module is used for storing described detection time logarithmic data.
The present invention is by judging in the time controlling the indoor of current-loop communication circuit or the transmitting terminal optocoupler conducting of outside whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, if do not receive the conventional communication data of described air-conditioning, after time delay, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and the detection time logarithmic data in storage space is preset in renewal, if described detection time logarithmic data equals preset times threshold value, the mode of connection that shows current-loop communication circuit is made mistakes, air conditioner can send fault prompting, and finish the interprocess communication between air conditioner chamber inner side and outside, current-loop communication circuit is quit work, thereby reach protection air conditioner room unit and off-premises station control panel and avoid the object of damaging, solve the problem that existing current-loop communication circuit can cause the control panel of indoor and outdoor both sides to be damaged in the time that the mode of connection of indoor and outdoor both sides is made mistakes.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of existing current-loop communication circuit;
Fig. 2 is the conventional wiring diagram of the indoor and outdoor both sides of the air-conditioning of existing single phase poaer supply supply;
Fig. 3 is the conventional wiring diagram of the indoor and outdoor both sides of the air-conditioning of existing three-phase supply supply;
Fig. 4 is the example false wiring figure of the indoor and outdoor both sides of the air-conditioning of single phase poaer supply supply;
Fig. 5 is the example false wiring figure of the indoor and outdoor both sides of the air-conditioning of three-phase supply supply;
Fig. 6 is the realization flow of the communication detecting method of the current-loop communication circuit that provides of the embodiment of the present invention;
Fig. 7 is the structural drawing of the communication detection system of the current-loop communication circuit that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention is by judging in the time controlling the indoor of current-loop communication circuit or the transmitting terminal optocoupler conducting of outside whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, if do not receive the conventional communication data of air-conditioning, after time delay, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and the detection time logarithmic data in storage space is preset in renewal, equal preset times threshold value if detect time logarithmic data, the mode of connection that shows current-loop communication circuit is made mistakes, air conditioner can send fault prompting, and finish the interprocess communication between air conditioner chamber inner side and outside, current-loop communication circuit is quit work, thereby reach protection air conditioner room unit and off-premises station control panel and avoid the object of damaging.
Fig. 6 shows the realization flow of the communication detecting method of the current-loop communication circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows part related to the present invention, and details are as follows:
In step S1, in the time of power-on of air conditioner, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, the detection time logarithmic data of storing in the default storage space of initialization, and time delay very first time interval.
In embodiments of the present invention, the span at very first time interval is 0.5 second to 10 seconds; Time delay very first time interval be for ensure current-loop communication circuit power on and stablize after carry out again follow-up each step, thereby improve the accuracy of communication detection; In addition, because working on power, each air conditioner all can follow once new communication detection process, so time logarithmic data of the detection after initialization can be zero or other any number.
In step S2, control the indoor of current-loop communication circuit or the transmitting terminal optocoupler conducting of outside.
In step S3, judge whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, are, perform step S8, no, perform step S4.
In step S4, judge whether the indoor of current-loop communication circuit or the receiving end of outside continue to receive the conventional communication data of non-air-conditioning within second time interval, are, perform step S5, no, jump to step S3.
In embodiments of the present invention, for take into account ensure detect accuracy and optocoupler not because overcurrent overlong time is damaged, so the span in second time interval is set as to 50 milliseconds to 2000 milliseconds.
In step S5, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and upgrade the detection time logarithmic data in default storage space.Step S5 specifically comprises the following steps:
Control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside;
The last detection time logarithmic data of preserving in default storage space is carried out obtaining new detection time logarithmic data after add-one operation, and be new detection time logarithmic data by the detection number of times Data Update in default storage space.
In embodiments of the present invention, because default storage space can be preserved an initial value that detects time logarithmic data when the power-on of air conditioner initialization, so in the time detecting the renewal of time logarithmic data for the first time, the last detection of preserving in above-mentioned default storage space time logarithmic data is exactly aforesaid initial value.
In step S6, timing also generates chronometric data, and judges whether described detection time logarithmic data equals preset times threshold value, is, performs step S9, no, performs step S7.
In embodiments of the present invention, the span of preset times threshold value is 1 to 20.
In step S7, judge whether described chronometric data equaled for the 3rd time interval, was, performed step S8, no, step S7 is returned in redirect.
In embodiments of the present invention, the span in the 3rd time interval is 0.5 second to 120 seconds.
In step S8, control air conditioner chamber inner side and open interprocess communication and jump to step S2 with outside.
In step S9, send fault prompting, finish the interprocess communication between air conditioner chamber inner side and outside.
Below in conjunction with instantiation, the communication detecting method of above-mentioned current-loop communication circuit is described further:
Suppose that the very first time is spaced apart 2 seconds, second time interval was 200 milliseconds, and the 3rd time interval was 30 seconds, and preset times threshold value is 10 times.In the time of power-on of air conditioner, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, , detection time logarithmic data in the default storage space of initialization is 0, and time delay 2 seconds, control again the transmitting terminal optocoupler conducting of indoor or the outside of current-loop communication circuit, then judge whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, if judged result is yes, controlling air conditioner chamber inner side opens interprocess communication with outside and returns and continue to judge whether to receive the conventional communication data of air-conditioning, if judged result is no, continue to judge whether the indoor of current-loop communication circuit or the receiving end of outside continue to receive the conventional communication data of non-air-conditioning in 200 milliseconds, if, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and detection time logarithmic data is carried out starting timing and generating chronometric data after add-one operation upgrades, and judge whether the detection time logarithmic data after upgrading equals 10, if, show that miscommunication occurs for inner side, air conditioning chamber and outside, the indoor of current-loop communication circuit and outside wiring make mistakes, and send immediately fault and point out, the interprocess communication finishing between air conditioner chamber inner side and outside is avoided occurring damaging because of overcurrent with protection air conditioner room unit and off-premises station control panel, if not, show that the indoor of current-loop communication circuit and the wiring of outside do not make mistakes, and judge whether chronometric data equals 30 seconds (judging whether the 3rd time interval arrived), in the time that enumeration data equals 30 seconds, control air conditioner chamber inner side and open interprocess communication with outside, and again return and continue to judge whether to receive the conventional communication data of air-conditioning, in addition, if the receiving end of the indoor of current-loop communication circuit or outside does not continue to receive the conventional communication data of non-air-conditioning in 200 milliseconds, return and continue to judge whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is to complete with the relevant hardware of instruction by program, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
Fig. 7 shows the structure of the communication detection system of the current-loop communication circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows part related to the present invention, and details are as follows:
The communication detection system of current-loop communication circuit comprises:
Power-up initializing module 100, optocoupler control module 200, the first data receiver judge module 300, the second data receiver judge module 1000, redirect module 1100, optocoupler control and counting module 400, timing and counting judge module 500, timing judge module 600, system control module 700, fault processing module 800 and memory module 900.
Power-up initializing module 100 is for controlling the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside when the power-on of air conditioner, the detection time logarithmic data in the default storage space of initialization, and time delay very first time interval.
The first data receiver judge module 300 is for judging whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning.
The second data receiver judge module 1000 when being no when the judged result of the first data receiver judge module 300, judges whether the indoor of current-loop communication circuit or the receiving end of outside continue to receive the conventional communication data of non-air-conditioning within second time interval.
Optocoupler control and counting module 400, for when the judged result of the second data receiver judge module 1000 is when being, are controlled the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and are upgraded the detection time logarithmic data in memory module 900.
Timing and counting judge module 500 are for timing and generate chronometric data, and judge whether above-mentioned detection time logarithmic data equals preset times threshold value.
Further, optocoupler control and counting module 400 comprise:
Counting unit 402, carries out obtaining new detection time logarithmic data after add-one operation for the last detection time logarithmic data that memory module 900 is preserved, and is new detection time logarithmic data by the detection number of times Data Update in memory module 900.
The embodiment of the present invention is by judging in the time controlling the indoor of current-loop communication circuit or the transmitting terminal optocoupler conducting of outside whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, if do not receive the conventional communication data of air-conditioning, after time delay, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and the detection time logarithmic data in storage space is preset in renewal, equal preset times threshold value if detect time logarithmic data, the mode of connection that shows current-loop communication circuit is made mistakes, air conditioner can send fault prompting, and finish the interprocess communication between air conditioner chamber inner side and outside, current-loop communication circuit is quit work, thereby reach protection air conditioner room unit and off-premises station control panel and avoid the object of damaging, solve the problem that existing current-loop communication circuit can cause the control panel of indoor and outdoor both sides to be damaged in the time that the mode of connection of indoor and outdoor both sides is made mistakes.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a communication detecting method for current-loop communication circuit, is characterized in that, described communication detecting method comprises the following steps:
A. in the time of power-on of air conditioner, control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, the detection time logarithmic data of storing in the default storage space of initialization, and time delay very first time interval;
B. control the transmitting terminal optocoupler conducting of indoor or the outside of current-loop communication circuit;
C. judge whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning, are, perform step H, no, perform step D;
D. judge whether the indoor of described current-loop communication circuit or the receiving end of outside continue to receive the conventional communication data of non-air-conditioning within second time interval, are, perform step E, no, jump to described step C;
E. control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, and upgrade the detection time logarithmic data in default storage space;
F. timing generate chronometric data, and judge whether described detection time logarithmic data equals preset times threshold value, is, performs step I, no, perform step G;
G. judge whether described chronometric data equaled for the 3rd time interval, was, performed step H, no, described step G is returned in redirect;
H. controlling air conditioner chamber inner side opens interprocess communication and jumps to described step B with outside;
I. send fault prompting, finish the interprocess communication between air conditioner chamber inner side and outside.
2. communication detecting method as claimed in claim 1, is characterized in that, the span at described very first time interval is 0.5 second to 10 seconds;
The span in described second time interval is 50 milliseconds to 2000 milliseconds;
The span in described the 3rd time interval is 0.5 second to 120 seconds;
The span of described preset times threshold value is 1 to 20.
3. communication detecting method as claimed in claim 1, is characterized in that, described step e specifically comprises the following steps:
Control the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside;
The last detection time logarithmic data of preserving in default storage space is carried out obtaining new detection time logarithmic data after add-one operation, and be described new detection time logarithmic data by the detection number of times Data Update in described default storage space.
4. a communication detection system for current-loop communication circuit, is characterized in that, described communication detection system comprises:
Power-up initializing module, optocoupler control module, the first data receiver judge module, the second data receiver judge module, redirect module, optocoupler control and counting module, timing and counting judge module, timing judge module, system control module, fault processing module and memory module;
Described power-up initializing module for controlling the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside, the detection time logarithmic data in the default storage space of initialization, and time delay very first time interval in the time of power-on of air conditioner;
Described optocoupler control module is used for the transmitting terminal optocoupler conducting of indoor or the outside of controlling current-loop communication circuit;
Described the first data receiver judge module is for judging whether the indoor of current-loop communication circuit or the receiving end of outside receive the conventional communication data of air-conditioning;
Described the second data receiver judge module, for when the judged result of described the first data receiver judge module is while being no, judges whether the indoor of described current-loop communication circuit or the receiving end of outside continue to receive non-air-conditioning routine communication data within second time interval;
Described redirect module is for jumping to described the first data receiver judge module while being no when the judged result of described the second data receiver judge module;
Described optocoupler control and counting module, for when the judged result of described the second data receiver judge module is when being, are controlled the indoor of current-loop communication circuit or the transmitting terminal optocoupler of outside and are ended, and upgrade the inferior logarithmic data of detection in described memory module;
Described timing is used for timing and generates chronometric data with counting judge module, and judges whether described detection time logarithmic data equals preset times threshold value;
Described timing judge module, for when described timing is when to count the judged result of judge module be no, judges whether described chronometric data equaled for the 3rd time interval;
Described system control module for when the judged result of described the first data receiver judge module be or the judged result of described timing judge module when being, control air conditioner chamber inner side and outside unlatching interprocess communication also jumps to described optocoupler control module;
Described fault processing module for when described timing with the judged result of counting judge module when being, send fault prompting, the interprocess communication inside end air conditioner chamber and between outside;
Described memory module is used for storing described detection time logarithmic data.
5. communication detection system as claimed in claim 4, is characterized in that, described optocoupler control and counting module comprise:
Optocoupler control module, for controlling the indoor of current-loop communication circuit or the cut-off of the transmitting terminal optocoupler of outside;
Counting unit, carries out obtaining new detection time logarithmic data after add-one operation for the last detection time logarithmic data that described memory module is preserved, and is described new detection time logarithmic data by the detection number of times Data Update in described memory module.
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| CN104834239A (en) * | 2015-05-12 | 2015-08-12 | 广东美的制冷设备有限公司 | Current loop communication and power supply control circuit of air conditioner and outdoor unit thereof |
| CN104850023A (en) * | 2015-05-12 | 2015-08-19 | 广东美的制冷设备有限公司 | Current loop communication and power supply control circuit of air conditioner and outdoor unit and method thereof |
| CN105972768A (en) * | 2016-05-26 | 2016-09-28 | 广东美的制冷设备有限公司 | Electric current loop communication control circuit and method of air conditioner |
| CN108088045A (en) * | 2017-12-18 | 2018-05-29 | 广东美的制冷设备有限公司 | Switching method, air conditioner and the readable storage medium storing program for executing of air conditioner communication mode |
| CN108151228A (en) * | 2017-12-18 | 2018-06-12 | 广东美的制冷设备有限公司 | Switching method, air conditioner and the readable storage medium storing program for executing of air conditioner communication mode |
| CN108732452A (en) * | 2018-05-31 | 2018-11-02 | 广东美芝制冷设备有限公司 | The communication detecting method and device of air-conditioning system and its current-loop communication circuit |
| WO2019024349A1 (en) * | 2017-08-04 | 2019-02-07 | 广东美的制冷设备有限公司 | Air conditioner current loop communication circuit and air conditioner |
| WO2021042949A1 (en) * | 2019-09-04 | 2021-03-11 | 青岛海尔空调电子有限公司 | Active outdoor unit detection method used for communication miswiring between indoor and outdoor units of air conditioner |
| CN113606658A (en) * | 2021-07-30 | 2021-11-05 | 佛山市顺德区美的电子科技有限公司 | Air conditioner and operation data monitoring method and device thereof and storage medium |
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