CN104296330B - Air conditioning outdoor unit, method for adjusting communication line impedance and air conditioning unit system - Google Patents
Air conditioning outdoor unit, method for adjusting communication line impedance and air conditioning unit system Download PDFInfo
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- CN104296330B CN104296330B CN201310309508.5A CN201310309508A CN104296330B CN 104296330 B CN104296330 B CN 104296330B CN 201310309508 A CN201310309508 A CN 201310309508A CN 104296330 B CN104296330 B CN 104296330B
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- communication
- air conditioning
- conditioning unit
- communication line
- air
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
Abstract
The invention provides an air conditioning outdoor unit, a method for adjusting communication line impedance and an air conditioning unit system. The air conditioning outdoor unit comprises an air conditioning host, a communication quality determining device and a signal adjusting device; the communication quality judging device is connected with the air conditioning host and is connected to a communication line of an air conditioning unit; the communication quality judging device determines the communication level of the communication line of the air conditioning unit and displays the judgment result; the signal adjusting device is connected with the air conditioning host and is connected to the communication line of the air conditioning unit; the signal adjusting device adjusts impedance of the communication line of the air conditioning unit. According to the system and method for automatically adjusting the impedance of the air conditioning unit, the dynamic adjustment of a communication signal can be achieved, and the communication error rate of the air conditioning unit meets the design requirement, and therefore the air conditioning unit works under the stable state; the rejection ratio is reduced, and the user comfort is improved.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of air-conditioner outdoor unit, the method for regulation communication line impedance
And air conditioning unit system.
Background technology
In general, air-conditioner is a kind of household electrical appliance for adjusting indoor temperature and/or purify the air of a room.Have
The building of multiple separate interior spaces generally uses one-driven-several type air conditioning unit, this air conditioning unit general bag
Include multiple indoor sets being separately positioned in the separate respective interior space and a room being connected with each indoor set
Outer machine.
The number of air-conditioner outdoor unit combination at present is increasing, and the number of units of connected indoor set is just more and more, makes
The length for obtaining communication data line is being continuously increased.In order that air conditioning unit be operated in optimum state, it is desirable to improve inside and outside air conditioning chamber
The promptness of data transfer between machine, therefore constantly lift the major tasks that communication baud rate is current each manufacturer.Communication baud rate
Lifting, the increase of data line length, all can cause signaling reflex level occur change.
At present the way of other producers is that the resistance of a fixed resistance value, other indoor sets are installed on off-premises station computer board
Also it is respectively mounted the resistance of a fixed resistance value.However, the length of communication distance, the size of baud rate, in-site installation environment all can
The quality level of air-conditioning indoor and outdoor machine communication is had influence on, but suppresses the scheme of signaling reflex by this specific resistance,
All factors cannot be considered, it is impossible to which impedance is adjusted according to practical situation, therefore, being fixed resistance can only improve air conditioning unit
Communication level, it is impossible to according to practical situation by air conditioning unit communication horizontal adjustment to most preferably.
The content of the invention
The invention provides a kind of air-conditioner outdoor unit, the method for regulation communication line impedance and air conditioning unit system, at present
Large-size air conditioning unit cable run distance is long, and installation environment is complicated, disturbs many, can realize that the dynamic of communication signal is adjusted by the present invention
It is whole, make the air conditioning unit communication bit error rate meet design requirement, so that it is guaranteed that air conditioning unit be operated in steady statue, reduce bad
Rate, improves the comfortableness of user.The technical scheme is as follows：
A kind of off-premises station device of communication line impedance adjustable, including：
Air-conditioner host, communication quality decision maker, sig-nal-conditioning unit；
The communication quality decision maker is connected with the air-conditioner host, and is connected to air conditioning unit communication line
In, the communication quality decision maker judges the communication level of air conditioning unit communication line, and shows result of determination；
The sig-nal-conditioning unit is connected with the air-conditioner host, and is connected in air conditioning unit communication line, institute
State impedance of the sig-nal-conditioning unit to air conditioning unit communication line to be adjusted.
Further, the air-conditioner host includes air-conditioning communication receiving/transmission device, and the air-conditioning communication receiving/transmission device includes two
Individual PORT COM, the air-conditioning communication receiving/transmission device is transmitted after communication signal is changed by the PORT COM.
Further, impedance of the sig-nal-conditioning unit by potentiometer to air conditioning unit communication line is adjusted
Section.
Further, the sig-nal-conditioning unit includes first resistor, second resistance, potentiometer and electric capacity；
One end of the first resistor is connected with one end of the second resistance, the other end of the first resistor and institute
The other end for stating second resistance is connected respectively with two PORT COM of the air-conditioner host；
The sliding end of the potentiometer is connected with a fixing end, and with the first resistor and the second resistance
Junction point is connected, and another fixing end of the potentiometer is connected with one end of the electric capacity, the other end of the electric capacity
Ground connection.
Further, the communication quality decision maker judges empty according to the communication signal transmitted in the communication line
Adjust the communication level of unit communication line.
Further, the communication quality decision maker includes detection module and judge module, the detection module and sentences
Disconnected module is connected；
The detection module is used to detect every time whether communication is correct in communication line, and calculates from start to Current communications
Accuracy；
The judge module is used to judge whether the accuracy of Current communications to reach threshold value, and judges logical according to judged result
News level.
Further, the detection module is specifically for by the communication in reference signal and the communication line for receiving
Signal compares, and judges whether communication is correct according to result of the comparison.
A kind of air conditioning unit system of communication line impedance adjustable, including：
Off-premises station, indoor units, connection；
The quantity of the indoor set included in the indoor units is more than or equal to 2；
All indoor sets included in the indoor units are in parallel by connection, and by connection and the room
Outer machine is connected, and working condition is passed to off-premises station by all of indoor set；
Wherein, the off-premises station includes：Air-conditioner host, communication quality decision maker, sig-nal-conditioning unit；
The communication quality decision maker is connected with the air-conditioner host, and is connected to air conditioning unit communication line
In, the communication quality decision maker judges the communication level of air conditioning unit communication line, and shows result of determination；
The sig-nal-conditioning unit is connected with the air-conditioner host, and is connected in air conditioning unit communication line, institute
State impedance of the sig-nal-conditioning unit to air conditioning unit communication line to be adjusted.
A kind of method of adjusting air conditioning group communication line impedance, including：
Transmit the working condition of all indoor sets；
According to the working condition of all indoor sets, judge whether air conditioning unit communication level is preferred, and display is sentenced
Disconnected result；
If not, the impedance to air conditioning unit communication line is adjusted, and continue to judge air conditioning unit communication water
The step of whether being preferred put down；
If it is, terminating adjustment.
Further, judge air conditioning unit communication line communication level whether be preferred including：
Judge every time whether communication is correct in communication line；
Calculate the accuracy from start to Current communications；
Whether the accuracy for judging Current communications reaches threshold value；
If it is, judging that communication level is preferred；
If not, judging communication level as not good.
Further, it is described to judge every time whether communication correctly includes in communication line：
Communication signal of the reference signal in the communication line for receiving is compared；
If the reference signal is identical with the communication signal in the communication line for receiving, judge that communication is correct
's；
If the reference signal is differed with the communication signal in the communication line for receiving, judge that communication is wrong
By mistake.
Further, when air conditioning unit communication level is not good, by the potentiometer in regulation communication line to sky
The impedance for adjusting the communication line of unit is adjusted.
Air-conditioner outdoor unit provided in an embodiment of the present invention, the method and air conditioning unit system that adjust communication line impedance, can
To realize the dynamic adjustment of communication signal, the air conditioning unit communication bit error rate is set to meet design requirement, so that it is guaranteed that air conditioning unit
Steady statue is operated in, fraction defective is reduced, the comfortableness of user is improved.
Description of the drawings
Fig. 1 is a kind of functional module of the air-conditioner outdoor unit device of communication line impedance adjustable provided in an embodiment of the present invention
Block diagram；
Fig. 2 is the circuit diagram of air-conditioning communication receiving/transmission device provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of sig-nal-conditioning unit provided in an embodiment of the present invention；
Fig. 4 is a kind of functional module frame of the air conditioning unit system of communication line impedance adjustable provided in an embodiment of the present invention
Figure；
Fig. 5 is a kind of method flow diagram of adjusting air conditioning group communication line impedance provided in an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in further detail.It is understood that this place is retouched
The specific embodiment stated, is used only for explaining the present invention, rather than limitation of the invention.
Air-conditioning is the household electrical appliance for adjusting indoor temperature and/or purify the air of a room.If had multiple mutually only
The building of the vertical interior space generally use it is one-driven-several type air conditioning unit, it is this air conditioning unit to generally comprise multiple difference
The indoor set being arranged in the separate respective interior space and an off-premises station being connected with each indoor set.Multiple rooms
Interior confidential and off-premises station is communicated, and working condition is passed to off-premises station, work shape of the off-premises station according to indoor set by indoor set
State is controlled to system.Indoor set number of units increases, and the increase of communication data line length, the lifting of communication baud rate can make
Unstable into communication signal, the bit error rate is raised, and unit cannot be operated in the problem of optimum state.
Fig. 1 is a kind of systemic-function of the air-conditioner outdoor unit device of communication line impedance adjustable provided in an embodiment of the present invention
Module frame chart.As shown in figure 1, the system includes：Air-conditioner host 101, communication quality decision maker 102, sig-nal-conditioning unit
103；Communication quality decision maker 102 is connected with air-conditioner host 101, and is connected in air conditioning unit communication line, communication
Quality judging device 102 judges the communication level of air conditioning unit communication line, and shows result of determination；Sig-nal-conditioning unit 103
It is connected with air-conditioner host 101, and is connected in air conditioning unit communication line, sig-nal-conditioning unit 103 is to air conditioning unit
The impedance of communication line is adjusted.
Wherein, air-conditioner host 101 includes air-conditioning communication receiving/transmission device, and air-conditioning communication receiving/transmission device includes two communication terminals
Mouthful, air-conditioning communication receiving/transmission device is transmitted after communication signal is changed by PORT COM.Fig. 2 is that the embodiment of the present invention is provided
An air-conditioning communication receiving/transmission device circuit diagram, as shown in Fig. 2 air-conditioning communication receiving/transmission device pass through port ina, port
Inb and port out carries out information exchange, two ports of interface CN15 and communication quality with the operational module inside air-conditioner host
Two ports of decision maker 102 are connected, while be also connected with two ports of sig-nal-conditioning unit 103, interface CN15
Two ports be also PORT COM main in air conditioning unit system.The chip of air-conditioning communication receiving/transmission device is used for communication letter
Number changed.
Impedance of the sig-nal-conditioning unit 103 by potentiometer to air conditioning unit communication line is adjusted.Fig. 3 is this
The circuit diagram of the sig-nal-conditioning unit that bright embodiment is provided, as shown in figure 3, sig-nal-conditioning unit 103 includes first resistor
R1, second resistance R2, potentiometer RW and electric capacity C, one end of first resistor R1 is connected with one end of second resistance R2, and first is electric
The other end of resistance R1 and the other end of second resistance R2 are connected respectively with PORT COM CN15 of air-conditioning communication receiving/transmission device.Electricity
One fixing end of position device RW is connected with the junction point of first resistor R1 and second resistance R2, and another of potentiometer RW is fixed
End is connected with one end of electric capacity C, the other end ground connection of electric capacity C.So, the knot for being judged according to communication quality decision maker 102
Really, impedance of the sig-nal-conditioning unit 103 by regulator potentiometer RW to air conditioning unit communication line is adjusted.
Communication quality decision maker 102 judges air conditioning unit communication line according to the communication signal transmitted in communication line
Communication level.Communication quality decision maker 102 includes detection module and judge module, and detection module is connected with judge module
Connect.Detection module is used to detect every time whether communication is correct in communication line, specifically, communicates every time in detection communication line
Whether compared by the communication signal by reference signal in the communication line for receiving, sentenced according to result of the comparison
Whether fixed communication is correct.Then the accuracy from start to Current communications is calculated, judge module is used to judge Current communications just
Really whether rate reaches threshold value, and judges communication level according to judged result.Embodiments of the invention preferably choose 95% it is correct
Rate is used as threshold value.When air conditioning unit communication level for it is not good when, on display without show either show NO or all can
The mark not good to represent air conditioning unit communication level, at this moment regulator potentiometer RW so that air conditioning unit communication line
Impedance can match with practical situation.When air conditioning unit communication level is preferred, show on display OK or all can
To represent the mark that air conditioning unit communication level is preferred, at this moment stop regulator potentiometer RW.
Fig. 4 is a kind of functional module frame of the air conditioning unit system of communication line impedance adjustable provided in an embodiment of the present invention
Figure, as shown in figure 4, the system includes：Off-premises station 401, indoor units 402, the connection 403 being related in Fig. 1, wherein, room
Outer machine includes：Air-conditioner host, communication quality decision maker, sig-nal-conditioning unit；Communication quality decision maker and air-conditioner host phase
Connection, and be connected in air conditioning unit communication line, communication quality decision maker judges the communication of air conditioning unit communication line
Level, and show result of determination；Sig-nal-conditioning unit is connected with air-conditioner host, and is connected to air conditioning unit communication line
In, impedance of the sig-nal-conditioning unit to air conditioning unit communication line is adjusted.Indoor set included in indoor units 402
Quantity be more than or equal to 2.Every indoor set included in indoor units also include an air-conditioning communication receiving/transmission device, and and
The air-conditioning communication receiving/transmission device of off-premises station is identical, two PORT COM that indoor set passes through air-conditioning communication receiving/transmission device, using logical
News line 403 is in parallel, and is connected with off-premises station by connection, and all of indoor set is possible to represent indoor set working condition
Signal transmission give air-conditioning communication receiving/transmission device, would indicate that the signal of indoor set working condition is carried out by air-conditioning communication receiving/transmission device
Conversion, and transmitted off-premises station；The communication quality decision maker of off-premises station judges air conditioning unit according to the working condition of indoor set
Communication level whether be preferred, and show judged result；The sig-nal-conditioning unit of off-premises station is sentenced according to communication quality decision maker
Impedance of the fixed result to air conditioning unit communication line is adjusted.It is when air conditioning unit communication level is not reaching to optimum
When not good, on display without show either show NO when or all can represent the not good mark of air conditioning unit communication level
Will, at this moment adjusts the potentiometer of the sig-nal-conditioning unit of off-premises station so that the impedance energy of air conditioning unit communication line and reality
Situation matches.When air conditioning unit communication level is optimal to be preferred, show on display OK or all can generation
During the mark that the air conditioning unit communication level of table is preferred, at this moment stop the potentiometer of the sig-nal-conditioning unit of regulation off-premises station.
Because indoor set is identical with the air-conditioning communication receiving/transmission device of off-premises station, referring to Fig. 2, the embodiment of the present invention is provided
An air-conditioning communication receiving/transmission device circuit diagram, the air-conditioning communication receiving/transmission device of all indoor sets or off-premises station connects
Mouth CN15 has two PORT COM, and the two ports are respectively 1 and 2 port, indoor set and all of 1 port phase of off-premises station
Connection, indoor set 2 port all of with off-premises station is connected, and the connection being connected with the two ports is home bus buses,
Whole air conditioning unit system enters the communication of row information by home bus buses.
For whole air conditioning unit system, the air-conditioning communication receiving/transmission device of indoor set would indicate that the letter of indoor set working condition
After number being changed, off-premises station is passed to by connection, the air-conditioning communication receiving/transmission device of off-premises station would indicate that indoor set works
The operational module inside air-conditioner host is changed and passed to the signal of state, and off-premises station is by according to the working condition of indoor set
Control signal is sent, control signal passes to the air-conditioning communication receiving/transmission device of indoor set by connection, and the air-conditioning of indoor set leads to
News R-T unit is changed control signal, and is controlled accordingly.
Fig. 5 is a kind of method flow diagram of adjusting air conditioning group communication line impedance provided in an embodiment of the present invention, such as Fig. 5
Shown, methods described includes：
Step 201：Transmit the working condition of all indoor sets.
First, working condition is passed to off-premises station by all indoor sets in air conditioning unit by communication line, by outdoor
Machine is controlled according to the working condition of indoor set.
Step 202：According to the working condition of all indoor sets, judge whether air conditioning unit communication level is preferred, and show
Show judged result.
On air conditioning unit connection, the device judged communication quality is installed, this pair of communication quality is carried out
The device of judgement judges whether air conditioning unit communication level is preferred according to the working condition of indoor set, if air conditioning unit
Communication level is preferred, the present embodiment preferably show over the display OK or all can represent air conditioning unit communication water
The flat mark being preferred, if air conditioning unit communication level is not good, does not just show either display NO or on display
Cutting can represent the not good mark of air conditioning unit communication level.
Wherein, judge whether the communication level of air conditioning unit communication line is preferred and specifically include step 2021～step
2025：
Step 2021：Judge every time whether communication is correct in communication line.
Communication signal in the communication line for receiving is correct with the expression in the device judged communication quality
The reference signal of signal is compared, if reference signal is identical with the communication signal in the communication line for receiving, judges logical
News are correct；If reference signal is differed with the communication signal in the communication line for receiving, judge that communication is wrong.
Step 2022：Calculate the accuracy from start to Current communications.
A statistics will be done to the result for currently being judged from start, with the correct number of times of communication divided by total communication number of times
100% is multiplied by again, is exactly the accuracy from start to Current communications.
Step 2023：Whether the accuracy for judging Current communications reaches threshold value.
Embodiments of the invention preferably choose 95% accuracy as threshold value.When from start to the correct of Current communications
When rate is more than 95%, illustrate that communication level is preferred, when the accuracy from start to Current communications is less than 95%, illustrate communication level
For not good.
Step 2024：If it is, judging that communication level is preferred.
Step 2025：If not, judging communication level as not good.
Step 203：If not, the impedance to air conditioning unit communication line is adjusted, and continue to judge air conditioning unit
Communication level the step of whether be preferred.
On air conditioning unit connection, the device being adjusted to the impedance of air conditioning unit communication line is installed, should
Impedance of the device to air conditioning unit communication line is adjusted.It is logical by adjusting when air conditioning unit communication level is not good
Impedance of the potentiometer of device to air conditioning unit communication line described in news circuit is adjusted.When air conditioning unit communication water
Put down as not good, on display without show either show NO or all can represent the not good mark of air conditioning unit communication level
During will, regulator potentiometer so that the impedance of air conditioning unit communication line can match with practical situation.Until air conditioning unit
When communication level is preferred, stop regulator potentiometer.
Step 204：If it is, terminating adjustment.
When air conditioning unit communication level is preferred, show on display OK or all can represent air conditioning unit communication
During the mark that level is preferred, terminate adjustment potentiometer.
The invention provides a kind of air-conditioner outdoor unit of communication line impedance adjustable, method and the system comprising device, mesh
Front large-size air conditioning unit cable run distance is long, and installation environment is complicated, disturbs many, and by the present invention dynamic of communication signal can be realized
Adjustment, makes the air conditioning unit communication bit error rate meet design requirement, so that it is guaranteed that air conditioning unit be operated in steady statue, reduces not
Yield, improves the comfortableness of user.
The above is only the explanation done for the preferred embodiments of the present invention and its know-why, and not to the present invention's
The restriction that technology contents are carried out, any those familiar with the art in technical scope disclosed in this invention,
The change or replacement being readily apparent that, all should cover within the scope of the present invention.
Claims (11)
1. a kind of off-premises station device of communication line impedance adjustable, it is characterised in that include：
Air-conditioner host, communication quality decision maker, sig-nal-conditioning unit；
The communication quality decision maker is connected with the air-conditioner host, and is connected in air conditioning unit communication line, institute
State communication quality decision maker and judge the communication level of air conditioning unit communication line, and show result of determination；
The sig-nal-conditioning unit is connected with the air-conditioner host, and is connected in air conditioning unit communication line, the letter
Number adjusting apparatus the communication level for it is not good when, using regulator potentiometer so that the impedance of air conditioning unit communication line and
Practical situation matches, and when the communication level is preferred, stops adjusting.
2. device according to claim 1, it is characterised in that the air-conditioner host includes air-conditioning communication receiving/transmission device, institute
Air-conditioning communication receiving/transmission device is stated including two PORT COM, the air-conditioning communication receiving/transmission device passes through institute after communication signal is changed
State PORT COM to be transmitted.
3. device according to claim 2, it is characterised in that the sig-nal-conditioning unit includes first resistor, second electric
Resistance, potentiometer and electric capacity；
One end of the first resistor is connected with one end of the second resistance, the other end of the first resistor and described
The other end of two resistance is connected respectively with two PORT COM of the air-conditioner host；
The sliding end of the potentiometer is connected with a fixing end, and with the connection of the first resistor and the second resistance
Point is connected, and another fixing end of the potentiometer is connected with one end of the electric capacity, the other end ground connection of the electric capacity.
4. device according to claim 1, it is characterised in that the communication quality decision maker is according to the communication line
Middle transmitted communication signal judges the communication level of air conditioning unit communication line.
5. device according to claim 4, it is characterised in that the communication quality decision maker includes detection module and sentences
Disconnected module, the detection module is connected with judge module；
The detection module is used to detect every time whether communication is correct in communication line, and calculates from start to Current communications just
True rate；
The judge module is used to judge whether the accuracy of Current communications to reach threshold value, and judges communication water according to judged result
It is flat.
6. device according to claim 5, it is characterised in that the detection module specifically for by reference signal with receive
To the communication line in communication signal compare, according to result of the comparison judge communication it is whether correct.
7. a kind of air conditioning unit system of communication line impedance adjustable, it is characterised in that include：
Off-premises station, indoor units, connection；
The quantity of the indoor set included in the indoor units is more than or equal to 2；
All indoor sets included in the indoor units are in parallel by connection, and by connection and the off-premises station
It is connected, working condition is passed to off-premises station by all of indoor set；
Wherein, the off-premises station includes：Air-conditioner host, communication quality decision maker, sig-nal-conditioning unit；
The communication quality decision maker is connected with the air-conditioner host, and is connected in air conditioning unit communication line, institute
State communication quality decision maker and judge the communication level of air conditioning unit communication line, and show result of determination；
The sig-nal-conditioning unit is connected with the air-conditioner host, and is connected in air conditioning unit communication line, the letter
Number adjusting apparatus the communication level for it is not good when, using regulator potentiometer so that the impedance of air conditioning unit communication line and
Practical situation matches, and when the communication level is preferred, stops adjusting.
8. a kind of method of adjusting air conditioning group communication line impedance, it is characterised in that include：
Transmit the working condition of all indoor sets；
According to the working condition of all indoor sets, judge whether air conditioning unit communication level is preferred, and show judgement knot
Really；
If not, the impedance to air conditioning unit communication line is adjusted, and continue to judge that air conditioning unit communication level is
It is not no the step of be preferred；
If it is, terminating adjustment.
9. method according to claim 8, it is characterised in that judge the communication level of air conditioning unit communication line whether as
It is good including：
Judge every time whether communication is correct in communication line；
Calculate the accuracy from start to Current communications；
Whether the accuracy for judging Current communications reaches threshold value；
If it is, judging that communication level is preferred；
If not, judging communication level as not good.
10. method according to claim 9, it is characterised in that described to judge every time whether communication is correct in communication line
Including：
Communication signal of the reference signal in the communication line for receiving is compared；
If the reference signal is identical with the communication signal in the communication line for receiving, judge that communication is correct；
If the reference signal is differed with the communication signal in the communication line for receiving, judge that communication is mistake
's.
11. methods according to claim 8, it is characterised in that when air conditioning unit communication level is not good, by adjusting
Impedance of the potentiometer in section communication line to air conditioning unit communication line is adjusted.
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| CN201310309508.5A CN104296330B (en) | 2013-07-19 | 2013-07-19 | Air conditioning outdoor unit, method for adjusting communication line impedance and air conditioning unit system |
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| CN201310309508.5A CN104296330B (en) | 2013-07-19 | 2013-07-19 | Air conditioning outdoor unit, method for adjusting communication line impedance and air conditioning unit system |
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| CN106302696A (en) * | 2016-08-11 | 2017-01-04 | 珠海格力电器股份有限公司 | A kind of determination device and method of air conditioning unit traffic rate |
| CN107036233B (en) * | 2017-03-27 | 2020-10-20 | 青岛海尔空调电子有限公司 | Indoor and outdoor unit communication method and device of air conditioner multi-connected unit and air conditioner |
| CN110336588B (en) * | 2019-05-10 | 2021-01-15 | 珠海格力电器股份有限公司 | Impedance self-adaptive matching method and device for long-distance communication line |
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