A communication control method, a communication system, and an air conditioner

Abstract

This invention provides a communication control method, a communication system, and an air conditioner, belonging to the field of communication technology. The communication method includes: acquiring the output voltage of a signal output terminal; adjusting a signal transmission mode based on the output voltage; wherein the signal transmission mode is a mode in which the difference between the received voltage and the output voltage at the signal receiving terminal is less than a first threshold. The communication system includes a signal output terminal, a signal receiving terminal, and an adjustment module. The signal output terminal and the signal receiving terminal are connected via a communication line; the adjustment module is electrically connected to both the signal output terminal and the signal receiving terminal, and is used to adjust the current flowing through the communication line. This method achieves reliable signal transmission for long-distance communication by automatically adjusting the signal transmission mode, and has the characteristics of low cost and stable reliability.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a communication control method, a communication system, and an air conditioner. Background Technology

[0002] Existing split-type air conditioners typically use communication lines to connect the signal transmitter and receiver, forming a communication circuit between the air conditioner's main unit and slave unit for data transmission. However, during communication, the communication signal is easily affected by current coupling in the circuit, causing fluctuations in the pulse signal, which in turn affects signal transmission, leading to signal distortion or even communication failure. This information distortion problem is particularly frequent during long-distance communication, resulting in a poor user experience and reducing the product's market competitiveness.

[0003] By protecting the cables, improving the performance of the communication cable materials, or adding a shielding layer to the communication cables, the problem of signal distortion during long-distance communication can be solved. However, these methods all increase the manufacturing cost of air conditioners, reduce the profit margin of enterprises, and are not conducive to widespread use.

[0004] Therefore, existing communication methods need to be improved to reduce the cost of long-distance communication and ensure its success rate. Summary of the Invention

[0005] To overcome the problems existing in related technologies, one of the objectives of this invention is to provide a communication control method that achieves reliable signal transmission for long-distance communication by automatically adjusting the signal transmission mode, and has the characteristics of low cost and stable reliability.

[0006] A communication control method, comprising:

[0007] Obtain the output voltage at the signal output terminal;

[0008] Adjust the signal transmission mode according to the output voltage;

[0009] The signal transmission mode is a mode in which the difference between the received voltage and the output voltage at the signal receiving end is less than a first threshold.

[0010] In a preferred embodiment of the present invention, the step of adjusting the signal transmission mode according to the output voltage includes:

[0011] Establish a mapping table between output voltage magnitude and signal transmission mode;

[0012] Determine the magnitude of the output voltage;

[0013] The output voltage magnitude is compared with the signal transmission mode mapping table, and the corresponding signal transmission mode is selected.

[0014] In a preferred embodiment of the present invention, the signal transmission mode mapping table includes a one-to-one correspondence of voltage range, program matching mode, and signal transmission mode;

[0015] The voltage range is used to match the magnitude of the output voltage;

[0016] The program matching mode is used to indicate the selected signal transmission mode;

[0017] The signal transmission mode is used to adjust the output voltage.

[0018] In a preferred embodiment of the present invention, it further includes:

[0019] During communication, the relay voltage is detected after the signal output mode is adjusted.

[0020] Determine if the difference between the relay voltage and the output voltage is less than the second threshold; if so, adjust the signal transmission mode again until the difference between the relay voltage and the output voltage is greater than or equal to the second threshold; if not, maintain the current signal output mode for communication.

[0021] A second objective of this invention is to provide a communication system for executing the communication control method described above.

[0022] In a preferred embodiment of the present invention, the signal output terminal, the signal receiving terminal, and the adjustment module are provided. The signal output terminal and the signal receiving terminal are connected via a communication line. The adjustment module is electrically connected to both the signal output terminal and the signal receiving terminal, and is used to adjust the current flowing through the communication line.

[0023] In a preferred embodiment of the present invention, the communication system further includes a feedback module;

[0024] The feedback module is used to detect the voltage of the communication line and feed the detected data back to the signal output terminal.

[0025] In a preferred embodiment of the present invention, the signal output terminal is provided with a TX interface, the signal receiving terminal is provided with an RX interface, the TX interface and the RX interface are connected through the communication line, and the adjustment module is connected to the communication line.

[0026] The adjustment module includes a voltage regulator and an optocoupler module, with the voltage regulator connected in series with the optocoupler module. The voltage regulator is electrically connected to the signal output terminal and contains multiple diodes connected in series, each of which is connected to an output port (out). By selecting different output ports (out), the output voltage of the voltage regulator can be changed. The voltage regulator is also connected to a VCC1 power supply.

[0027] The optocoupler module has two input terminals and two output terminals. The two input terminals of the optocoupler module are respectively connected to the output port OUT and the TX interface; the two output terminals of the optocoupler module are respectively connected to the RX interface and ground. A VCC2 power supply is provided between the output terminals of the optocoupler module and the RX interface.

[0028] In a preferred embodiment of the present invention, the feedback module includes a voltage detector and a controller. The voltage detector is used to detect the voltage between the input terminal of the optocoupler module and the TX interface. The controller receives the information fed back by the voltage detector and controls the operation of the voltage regulator according to the feedback information.

[0029] A third objective of this invention is to provide an air conditioner that includes the communication system described above.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention provides a communication control method and system. The method acquires the output voltage of the signal output terminal during communication and adjusts the signal transmission mode based on the output voltage. The signal transmission mode is one where the difference between the received voltage and the output voltage at the signal receiving terminal is less than a first threshold. During long-distance communication, this method detects the voltage magnitude of the signal output terminal in real time and selects a matching signal transmission mode to ensure that the voltage received by the signal receiving terminal is close to the voltage received by the signal output terminal. For example, if the signal output terminal outputs a high level, the signal receiving terminal receives a high-level signal; if the signal output terminal outputs a low level, the signal receiving terminal receives a low-level signal. This method can automatically adjust the transmission voltage and achieve reliable transmission of communication signals by changing the transmission mode, preventing signal distortion. It does not require changes to the communication cable and is characterized by low cost and stable reliability.

[0032] The present invention also provides an air conditioner including the above-mentioned communication system, which does not cause signal distortion during long-distance communication, has low production cost, and has high market competitiveness. Attached Figure Description

[0033] Figure 1 This is a flowchart of the communication control method provided by the present invention;

[0034] Figure 2 This is a flowchart of the signal transmission mode adjustment based on the output voltage provided by the present invention;

[0035] Figure 3 This is a schematic diagram of the communication system provided by the present invention;

[0036] Figure 4This is a circuit connection diagram of the communication system of the air conditioner provided in this embodiment of the invention;

[0037] Figure 5 This is a control flowchart of the communication system for an air conditioner provided in an embodiment of the present invention.

[0038] Figure label:

[0039] 1. Signal output terminal; 2. Adjustment module; 3. Signal receiving terminal; 4. Feedback module. Detailed Implementation

[0040] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0041] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0042] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] Example

[0044] Traditional communication peripheral circuit design is generally regarded as a straight-through connection method, that is, the transmitter directly connects to the receiver. This type of circuit design has high requirements for the components themselves, as well as high requirements for the conductivity performance of the communication line. In particular, the cost of long-distance lines will rise rapidly, and the manufacturing cost will remain high. This obviously cannot convince consumers to buy it, thus making it impossible for the air conditioning products produced to stand in the market competition.

[0045] Based on the above shortcomings, this application provides a communication control method, such as... Figures 1-2As shown, the method specifically includes:

[0046] S100. Obtain the output voltage of signal output terminal 1. It should be noted that the output voltage of signal output terminal 1 can be obtained using a voltage detector. Furthermore, the obtained voltage is not the voltage at the interface of signal output terminal 1, but rather the voltage transmitted over a certain distance via the communication line. Since the communication line itself has a certain resistance, the voltage will gradually decrease during long-distance communication due to the resistance. Therefore, the voltage detection point needs to be a certain distance from the output interface of signal output terminal 1. This distance should be maintained at 1 / 2 to 2 / 3 of the length of the communication line between signal output terminal 1 and signal receiving terminal 3.

[0047] S200: Adjust the signal transmission mode according to the output voltage;

[0048] The signal transmission mode is defined as follows: the difference between the received voltage and the output voltage at the signal receiving terminal 3 is less than a first threshold. This signal transmission mode can be achieved by introducing an addendum to establish a standard object-field model for signal transmission. This object model applies an electric field between the signal output terminal 1 and the signal receiving terminal 3 to alter the electrical signal transmission between them, ensuring that the voltage difference between them is less than the first threshold. In other words, it maintains a small voltage difference between the signal output terminal 1 and the signal receiving terminal 3. It should be noted that the first threshold can be determined based on prior information from the field of communications.

[0049] The aforementioned communication control method and system acquire the output voltage of signal output terminal 1 during communication and adjust the signal transmission mode according to the output voltage. The signal transmission mode is one where the difference between the received voltage and the output voltage at signal receiving terminal 3 is less than a first threshold. During long-distance communication, this method detects the voltage magnitude of signal output terminal 1 in real time and selects a matching signal transmission mode to ensure that the voltage received by signal receiving terminal 3 is close to the voltage received by signal output terminal 1. For example, if signal output terminal 1 outputs a high level, signal receiving terminal 3 receives a high-level signal; if signal output terminal 1 outputs a low level, signal receiving terminal 3 receives a low-level signal. This method can automatically adjust the transmission voltage and achieve reliable transmission of communication signals by changing the transmission mode, preventing signal distortion. It does not require changes to the communication cable and is characterized by low cost and stable reliability.

[0050] More specifically, the adjustment of the signal transmission mode based on the output voltage includes:

[0051] S210. Establish a mapping table between output voltage magnitude and signal transmission mode;

[0052] S220, Determine the magnitude of the output voltage;

[0053] S230. Compare the output voltage with the signal transmission mode mapping table and select the corresponding signal transmission mode.

[0054] In practical applications, different voltage levels correspond to different voltage transmission modes. These modes can either increase or decrease the voltage level between the signal output terminal 1 and the signal receiving terminal 3. This mapping table can be stored at the signal transmitting end for retrieval and use.

[0055] In a more specific implementation, the signal transmission mode mapping table includes a one-to-one correspondence of voltage ranges, program matching modes, and signal transmission modes;

[0056] The voltage range is used to match the magnitude of the output voltage;

[0057] The program matching mode is used to indicate the selected signal transmission mode;

[0058] The signal transmission mode is used to adjust the output voltage.

[0059] In practical applications, multiple different program matching modes are established in the controller. Each program matching mode corresponds to a different voltage range and a different output mode on the controller. When changing the signal transmission mode, the voltage range is first matched based on the acquired voltage magnitude. Then, the controller adjusts the different program matching modes according to the matched voltage range. Different program matching modes correspond to different signal transmission modes, meaning that the magnitude of the transmitted voltage can be changed by changing the signal transmission mode.

[0060] More specifically, it also includes:

[0061] During communication, the relay voltage is detected after the signal output mode is adjusted.

[0062] Determine if the difference between the relay voltage and the output voltage is less than the second threshold; if so, adjust the signal transmission mode again until the difference between the relay voltage and the output voltage is greater than or equal to the second threshold; if not, maintain the current signal output mode for communication.

[0063] The relay voltage is tested to verify whether the voltage, after signal transmission mode adjustment, meets the requirements for reliable signal transmission and ensures that the signal is not distorted. The second threshold can be less than the first threshold.

[0064] The present invention also provides a communication system for performing the communication control method described above.

[0065] Furthermore, the communication system includes a signal output terminal 1, a signal receiving terminal 3, and an adjustment module 2. The signal output terminal 1 and the signal receiving terminal 3 are connected via a communication line. The adjustment module 2 is electrically connected to the signal output terminal 1 and the signal receiving terminal 3, respectively, and is used to adjust the current flowing through the communication line.

[0066] This communication system is used in an air conditioner. The signal output terminal 1 is the main unit, and the signal receiving terminal 3 is the slave unit. The adjustment module 2 forms an isolation component between the main unit and the slave unit, used to adjust the voltage between them. The main unit and slave unit communicate via a communication line. Due to the resistance of the communication line itself, the signal between the main unit and slave unit is prone to distortion during long-distance communication. By introducing the isolation component, the voltage between the main unit and slave unit is changed, ensuring the stability of communication between them.

[0067] In a preferred embodiment, the communication system further includes a feedback module 4;

[0068] The feedback module 4 is used to detect the voltage of the communication line and feed the detected data back to the signal output terminal 1. In practical applications, the signal output terminal 1 is a host computer, which can control the operation of the adjustment module 2. The feedback module 4 provides data support for the host computer to control the operation of the adjustment module 2.

[0069] In a more specific embodiment, the signal output terminal 1 is provided with a TX interface, the signal receiving terminal 3 has an RX interface, the TX interface and the RX interface are connected through the communication line, and the adjustment module 2 is connected to the communication line;

[0070] The adjustment module 2 includes a voltage regulator and an optocoupler module, with the voltage regulator connected in series with the optocoupler module. The voltage regulator is electrically connected to the signal output terminal 1. The voltage regulator contains multiple diodes connected in series, each of which is connected to an output port OUT. By selecting different output ports OUT, the output voltage of the voltage regulator can be changed. The voltage regulator is also connected to the VCC1 power supply.

[0071] The optocoupler module has two input terminals and two output terminals. The two input terminals of the optocoupler module are respectively connected to the output port OUT and the TX interface; the two output terminals of the optocoupler module are respectively connected to the RX interface and ground. A VCC2 power supply is provided between the output terminals of the optocoupler module and the RX interface.

[0072] In the voltage regulator, the resistance between different diodes can be changed by selectively connecting them, and the output current of the voltage regulator can also be changed by the VCC1 power supply, thus changing the output voltage. The received voltage at the signal receiver 3 is adjusted by selectively turning on the optocoupler module.

[0073] Furthermore, the feedback module 4 includes a voltage detector and a controller. The voltage detector detects the voltage between the input terminal of the optocoupler module and the TX interface. The controller receives the feedback information from the voltage detector and controls the operation of the voltage regulator based on the feedback information. Real-time detection of the voltage between the input terminal of the optocoupler module and the TX interface allows for timely adjustment of the operating mode of the adjustment module based on the detection results, ensuring stable signal transmission.

[0074] The following describes the operation of the communication system claimed in this application using an air conditioner communication system as an example. This system includes a host computer (signal output terminal 1), a slave computer (signal receiving terminal 3), an adjustment module 2, a feedback module 4, a VCC1 power supply, and a VCC2 power supply. The adjustment module 2 includes a voltage regulator D1 and an optocoupler. The voltage regulator includes a step-down circuit composed of multiple different diodes (d1, d2, ..., dn) connected in series. The specific connection method of this communication system is as follows... Figure 4 As shown, the specific working process of this communication system is as follows (taking the internal diodes of voltage regulator D1 as germanium diodes with a voltage drop of 0.3V, VCC1 as 5V, and VCC2 as 3.3V as an example):

[0075] The host computer can select the output ports out1-out4 of the voltage regulator via the Cr1 pin control signal, which can then be connected to diodes of the same specification in lines 1-4 respectively. The voltage regulator is a controllable chip integrated with diodes and other components. It connects the corresponding receiving-side I / O ports of the host computer and the slave computer. TX corresponds to the host computer interface, RX to the slave computer interface, VCC1 to the power supply voltage of the transmitting chip, VCC2 to the power supply voltage of the receiving chip, and X1 is an optocoupler.

[0076] When the TX interface sends a high level, the X1 input side is cut off, and the optocoupler is not conducting. The RX interface is pulled up to VCC2 through resistor r2 to a high level. When the TX interface is low, the X1 input side is conducting, making the optocoupler's output side equivalent to being on. The RX interface is connected to ground through a transistor (the transistor's saturation voltage drop is generally less than 0.3V), so the RX interface detects a low level of less than 0.3V, thus enabling data transmission and reception. See also Figure 5, during the process of adjusting the signal transmission mode, the host computer monitors the voltage signal at point B in real time, outputs different control signals according to different voltage ranges, and controls different working modes of the voltage regulator D1 through the GPIO port: Among them, mode 1 is that out1 is selected and only diode d1 is connected to the circuit; mode 2 is that out2 is selected and diodes d1 and d2 are connected in series to the circuit... mode 4 is that diodes d1, d2, d3, and d4 are connected in series to the circuit. When the TX interface sends a high level, to ensure that the lower computer receives the high level, the optocoupler X1 is in the cut-off state: 1) When the voltage VB at point B is 4 < VB ≤ 5, the condition for X1 to be cut off is VCC1 - UD1 - U ≤ 4 (UD1 is the voltage drop of the voltage regulator D1, and U is the conduction voltage of the optocoupler X1, taking 0.7V), that is, 5 - UD1 - 0.7 ≤ 4, that is, UD1 ≥ 0.3. The voltage regulator D1 can select any of mode 1 - mode 4. The host computer program controls Crl to output mode 1, and the TX interface can have a voltage drop margin of 1V when transmitting a high level r1; 2) When the voltage VB at point B is 3.7 < VB ≤ 4, the condition for X1 to be cut off is VCC1 - UD1 - U ≤ 3.7, that is, 5 - UD1 - 0.7 ≤ 3.7, that is, UD1 ≥ 0.6. The TX port can select any of mode 2 - mode 4. The program controls Crl to output mode 2, and the TX interface can have a voltage drop margin of 1.3V when transmitting a high level r1; 3) When the voltage VB at point B is 3.4 < VB ≤ 3.7, the condition for X1 to be cut off is VCC1 - UD1 - U ≤ 3.4, that is, 5 - UD1 - 0.7 ≤ 3.4, that is, UD1 ≥ 0.9. The voltage regulator D1 can select any of mode 3 - mode 4. The host computer program controls Crl to output mode 3, and the TX interface can have a voltage drop margin of 1.6V when transmitting a high level r1. The same principle applies to other modes and will not be elaborated here.

[0077] When the TX interface sends a low level, to ensure that the lower computer receives the low level, then X1 is in the conduction state: By default, the voltage at point B is 0V, then 5 - UD1 - 0.7 ≥ 0, UD1 ≤ 4.3V. The voltage regulator D1 selects mode 3 - mode 4, and the host computer program controls Crl to output mode 1.

[0078] According to the transmission wire R = ρ * L / S (ρ is the resistivity of the wire, L is the length of the wire, and S is the cross-sectional area of the conductor), and at the same time, according to Ohm's law R = U / I, it can be known that under the same conditions, the wire length and the wire voltage drop are in a proportional relationship, that is, the long-distance high-level signal can be reliably transmitted through the dynamic voltage regulation module. This communication system dynamically adjusts the output mode of the voltage regulator D1 according to different usage scenario information, so as to achieve adaptive adjustment and ensure the reliable transmission of high levels.

[0079] The present invention also provides an air conditioner including the above communication system. During the long-distance communication process of this air conditioner, the signal will not be distorted, and the production cost is relatively low, having high market competitiveness.

[0080] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0081] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0082] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A communication system, characterized in that, include: The system includes a signal output terminal, a signal receiving terminal, and an adjustment module. The signal output terminal and the signal receiving terminal are connected via a communication line. The adjustment module is electrically connected to both the signal output terminal and the signal receiving terminal, and is used to adjust the voltage flowing through the communication line. The signal output terminal is provided with a TX interface, the signal receiving terminal is provided with an RX interface, the TX interface and the RX interface are connected through the communication line, and the adjustment module is connected to the communication line; The adjustment module includes a voltage regulator and an optocoupler module, with the voltage regulator connected in series with the optocoupler module. The voltage regulator is electrically connected to the signal output terminal and contains multiple diodes connected in series, each of which is connected to an output port (out). By selecting different output ports (out), the output voltage of the voltage regulator can be changed. The voltage regulator is also connected to a VCC1 power supply. The optocoupler module has two input terminals and two output terminals. The two input terminals of the optocoupler module are respectively connected to the output port OUT and the TX interface; the two output terminals of the optocoupler module are respectively connected to the RX interface and ground; and a VCC2 power supply is provided between the output terminals of the optocoupler module and the RX interface. The communication system is used to execute communication control methods; The communication control method includes: Obtain the output voltage at the signal output terminal; The signal transmission mode is adjusted according to the output voltage; wherein the signal transmission mode is used to adjust the output voltage so that the difference between the received voltage and the output voltage at the signal receiving end is less than a first threshold.

2. The communication system according to claim 1, characterized in that: The communication system also includes a feedback module; The feedback module is used to detect the voltage of the communication line and feed the detected data back to the signal output terminal.

3. The communication system according to claim 2, characterized in that: The feedback module includes a voltage detector and a controller. The voltage detector is used to detect the voltage between the input terminal of the optocoupler module and the TX interface. The controller receives the information fed back by the voltage detector and controls the operation of the voltage regulator according to the feedback information.

4. A communication system according to claim 3, characterized in that: The method of adjusting the signal transmission mode according to the output voltage includes: Establish a mapping table between output voltage magnitude and signal transmission mode; Determine the magnitude of the output voltage; The output voltage magnitude is compared with the signal transmission mode mapping table, and the corresponding signal transmission mode is selected.

5. A communication system according to claim 4, characterized in that: The signal transmission mode mapping table includes a one-to-one correspondence of voltage ranges, program matching modes, and signal transmission modes. The voltage range is used to match the magnitude of the output voltage; The program matching mode is used to indicate the selected signal transmission mode; The signal transmission mode is used to adjust the output voltage.

6. A communication system according to claim 5, characterized in that: Also includes: During communication, the relay voltage is detected after the signal output mode is adjusted. Determine if the difference between the relay voltage and the output voltage is less than the second threshold; if so, adjust the signal transmission mode again until the difference between the relay voltage and the output voltage is greater than or equal to the second threshold; if not, maintain the current signal output mode for communication.

7. An air conditioner, characterized in that: The air conditioner includes the communication system as described in any one of claims 1-6.

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