CN103248546A - Multi-connected air conditioner, address assignment method of indoor unit thereof and outdoor unit - Google Patents
Multi-connected air conditioner, address assignment method of indoor unit thereof and outdoor unit Download PDFInfo
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- CN103248546A CN103248546A CN201210027815XA CN201210027815A CN103248546A CN 103248546 A CN103248546 A CN 103248546A CN 201210027815X A CN201210027815X A CN 201210027815XA CN 201210027815 A CN201210027815 A CN 201210027815A CN 103248546 A CN103248546 A CN 103248546A
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Abstract
The invention discloses a multi-connected air conditioner, an address assignment method of an indoor unit thereof and an outdoor unit, wherein the address assignment method of the indoor unit thereof comprises the following steps: an original address of the indoor unit of each of multiple combined air conditioners is collected by a first outdoor unit; a communication order of the indoor unit of each of multiple combined air conditioners is collected by the first outdoor unit; and the address offsets of various combined air conditioners are calculated by the first outdoor unit according to the communication orders of the various combined air conditioners and the original addresses of the indoor units of the various combined air conditioners and the calculated address offsets are sent to the various combined air conditioners respectively, so that the original addresses of the indoor units of the various combined air conditioners are updated according to the corresponding address offsets respectively. Through adoption of the multi-connected air conditioner, the address assignment method of the indoor unit thereof and the outdoor unit, the problem that a multi-connected air conditioner cannot assign the address of each indoor unit automatically in the prior art is solved, so that the effect that different addresses are assigned to the various indoor units automatically by the multi-connected air conditioner is achieved.
Description
Technical field
The present invention relates to the air conditioner field, in particular to address distribution method and the off-premises station of a kind of multi-connected air conditioner device and indoor set thereof.
Background technology
Air conditioner is a kind of temperature, humidity, air-flow and pure and fresh degree of adjustable air, and makes indoor environment keep the device of comfort conditions.In order to adapt to user's demand better, can arrange for the off-premises station of an air conditioner and be installed in not a plurality of indoor sets of chummery respectively, form combined air conditioner, in order to carry out the operation of cold-room or greenhouse in each indoor space, and can tackle the operating load of each indoor set preferably, the connection parallel with one another of the off-premises station of many combined air conditioners is used, formed the multi-connected air conditioner device.
For the multi-connected air conditioner device, need carry out address assignment to each indoor set, in the prior art, in that being carried out address of indoor unit, multi-connected air conditioner device unit divides timing, need use the address dial-up to indoor set and off-premises station, the address manually is set, this kind arranges the mode of address when carrying out project installation, it is huge that the address workload is set, and dial-up duplicates and wrong phenomenon easily; And this kind distributes the mode of address of indoor unit, in host computer (PC basic unit) monitoring during machine, if host computer wants to determine the specifying information of an indoor set, then need to realize by double address (address of address of indoor unit and the off-premises station that is connected with this indoor set), cause host computer to the monitor mode complexity of indoor set.Therefore, how can make the multi-connected air conditioner device distribute the address that has nothing in common with each other to become those skilled in the art's research direction to each indoor set automatically.
Problem at multi-connected air conditioner device in the correlation technique can't distribute each address of indoor unit does not automatically propose effective solution at present as yet.
Summary of the invention
Main purpose of the present invention is to provide address distribution method and the off-premises station of a kind of multi-connected air conditioner device and indoor set thereof, to solve the problem that the multi-connected air conditioner device can't distribute each address of indoor unit automatically in the prior art.
To achieve these goals, according to an aspect of the present invention, a kind of address distribution method of multi-connected air conditioner air conditioner indoor machine is provided, wherein, the multi-connected air conditioner device is made of many combined air conditioners, address distribution method comprises: first off-premises station is gathered the original address of the indoor set of each combined air conditioner in many combined air conditioners, and wherein, first off-premises station is the master control off-premises station of multi-connected air conditioner device; First off-premises station is gathered the communication order of each combined air conditioner in many combined air conditioners, and wherein, the communication order is corresponding with the sequence of addresses of each combined air conditioner on the communication bus of multi-connected air conditioner device; And first off-premises station calculate the address offset amount of each combined air conditioner according to the original address of the indoor set of the communication of each combined air conditioner order and each combined air conditioner, and the address offset amount that calculates is sent to each combined air conditioner respectively, so that the indoor set of each combined air conditioner upgrades original address according to corresponding address offset amount respectively.
Before first off-premises station is gathered the original address of the indoor set of each combined air conditioner in many combined air conditioners, address distribution method also comprises: the off-premises station of each combined air conditioner in many combined air conditioners is all gathered the original address of all indoor sets of the combined air conditioner at place, and the maximum original address in the original address that collects is sent to first off-premises station, wherein, the original address that first off-premises station is gathered the indoor set of each combined air conditioner in many combined air conditioners comprises: first off-premises station receives the maximum original address of the indoor set of each combined air conditioner, and first off-premises station comprises according to the address offset amount that the original address of the indoor set of the communication order of each combined air conditioner and each combined air conditioner calculates each combined air conditioner: first off-premises station calculates the address offset amount of each combined air conditioner according to the maximum original address of the indoor set of the communication order of each combined air conditioner and each combined air conditioner.
Further, when the communication of each combined air conditioner was followed successively by first combined air conditioner and second combined air conditioner in proper order, first off-premises station comprises according to the address offset amount that the maximum original address of the indoor set of the communication of each combined air conditioner order and each combined air conditioner calculates each combined air conditioner: first off-premises station determined that the address offset amount of first combined air conditioner is zero; And first off-premises station determine that the maximum original address of the indoor set of first combined air conditioner is the address offset amount of second combined air conditioner.
Further, when the communication of each combined air conditioner was followed successively by first combined air conditioner, second combined air conditioner and the 3rd combined air conditioner in proper order, first off-premises station comprised according to the address offset amount that the maximum original address of the indoor set of the communication of each combined air conditioner order and each combined air conditioner calculates each combined air conditioner: first off-premises station is determined the address offset amount that the maximum original address sum of the indoor set of the maximum original address of indoor set of first combined air conditioner and second combined air conditioner is the 3rd combined air conditioner.
Further, before first off-premises station is gathered the original address of the indoor set of each combined air conditioner in many combined air conditioners, address distribution method also comprises: first indoor set judges whether self has applied for original address, wherein, first indoor set is any indoor set in the multi-connected air conditioner device; And when the judgement of first indoor set self is not applied for original address, send request for data to the off-premises station corresponding with first indoor set, to obtain the original address of first indoor set.
Further, request for data comprises: the identification code of first indoor set.
To achieve these goals, according to a further aspect in the invention, provide a kind of off-premises station of multi-connected air conditioner device, having comprised: first collecting unit, for the original address of the indoor set of gathering many each combined air conditioner of combined air conditioner; Second collecting unit, the communication order that is used for gathering many each combined air conditioner of combined air conditioner, wherein, the communication order is corresponding with the sequence of addresses of each combined air conditioner on the communication bus of multi-connected air conditioner device; And computing unit, be used for calculating according to the original address of the indoor set of the communication order of each combined air conditioner and each combined air conditioner the address offset amount of each combined air conditioner, and the address offset amount that calculates is sent to each combined air conditioner respectively, so that the indoor set of each combined air conditioner upgrades original address according to corresponding address offset amount respectively.
To achieve these goals, according to a further aspect in the invention, provide a kind of multi-connected air conditioner device, comprised the off-premises station that the application's foregoing provides.
By the present invention, adopt first off-premises station to gather the original address of the indoor set of each combined air conditioner in many combined air conditioners, wherein, first off-premises station is the master control off-premises station of multi-connected air conditioner device; First off-premises station is gathered the communication order of each combined air conditioner in many combined air conditioners, and wherein, the communication order is corresponding with the sequence of addresses of each combined air conditioner on the communication bus of multi-connected air conditioner device; And first off-premises station calculate the address offset amount of each combined air conditioner according to the original address of the indoor set of the communication of each combined air conditioner order and each combined air conditioner, and the address offset amount that calculates is sent to each combined air conditioner respectively, so that the indoor set of each combined air conditioner upgrades original address according to corresponding address offset amount respectively, master control off-premises station by multi-connected air conditioner device system is gathered the original address of the indoor set of each combined air conditioner under its system, on the basis of original address, calculate corresponding address offset amount in proper order in conjunction with the communication of each combined air conditioner, make that the address offset amount of each combined air conditioner is all different, and then the address of each indoor set is also inequality after making each indoor set according to corresponding side-play amount renewal original address, the realization system distributes the address from the trend indoor set, solved that the multi-connected air conditioner device can't distribute the problem of each address of indoor unit automatically in the prior art, and then reached the multi-connected air conditioner device distributes the address that has nothing in common with each other automatically to each indoor set effect.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the off-premises station of the multi-connected air conditioner device of the embodiment of the invention;
Fig. 2 is the flow chart according to the address distribution method of the multi-connected air conditioner air conditioner indoor machine of first embodiment of the invention; And
Fig. 3 is the flow chart according to the address distribution method of the multi-connected air conditioner air conditioner indoor machine of second embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 1 is the schematic diagram according to the off-premises station of the multi-connected air conditioner device of the embodiment of the invention, and as shown in Figure 1, the off-premises station of the multi-connected air conditioner device of this embodiment comprises first collecting unit 10, second collecting unit 20 and computing unit 30.
Wherein, first collecting unit 10 is for the original address of the indoor set of gathering many each combined air conditioner of combined air conditioner.
Second collecting unit 20, the communication order that is used for gathering many each combined air conditioner of combined air conditioner, wherein, the communication order is corresponding with the sequence of addresses of each combined air conditioner on the communication bus of multi-connected air conditioner device.
Computing unit 30, be used for calculating according to the original address of the indoor set of the communication order of each combined air conditioner and each combined air conditioner the address offset amount of each combined air conditioner, and the address offset amount that calculates is sent to each combined air conditioner respectively, so that the indoor set of each combined air conditioner upgrades original address according to corresponding address offset amount respectively.
Gather the original address of each indoor set by first collecting unit 10, the communication of 20 pairs of each combined air conditioners of second collecting unit is gathered in proper order, computing unit 30 calculates corresponding address offset amount in proper order in conjunction with the communication of each combined air conditioner on the basis of original address, make that the address offset amount of each combined air conditioner is all different, and then the address of each indoor set is also inequality after making each indoor set according to corresponding side-play amount renewal original address, the realization system distributes the address from the trend indoor set, solve the problem that the multi-connected air conditioner device can't distribute each address of indoor unit automatically in the prior art, reached the multi-connected air conditioner device of the off-premises station that adopts the embodiment of the invention can distribute the address that has nothing in common with each other automatically to each indoor set effect.
Fig. 2 is the flow chart according to the address distribution method of the multi-connected air conditioner air conditioner indoor machine of first embodiment of the invention, and as shown in Figure 2, the address distribution method among this embodiment comprises that step S102 is to step S106.
S102: first off-premises station is gathered the original address of the indoor set of each combined air conditioner in many combined air conditioners, and wherein, first off-premises station is the master control off-premises station of multi-connected air conditioner device.
S104: first off-premises station is gathered the communication order of each combined air conditioner in many combined air conditioners, and wherein, the communication order is corresponding with the sequence of addresses of each combined air conditioner on the communication bus of multi-connected air conditioner device;
S106: first off-premises station calculates the address offset amount of each combined air conditioner according to the original address of the indoor set of the communication of each combined air conditioner order and each combined air conditioner, and the address offset amount that calculates is sent to each combined air conditioner respectively, so that the indoor set of each combined air conditioner upgrades original address according to corresponding address offset amount respectively.
Gather the communication order of original address and each combined air conditioner of each indoor set by the master control off-premises station of multi-connected air conditioner device system, on the basis of original address, calculate corresponding address offset amount in proper order in conjunction with the communication of each combined air conditioner, make that the address offset amount of each combined air conditioner is all different, and then the address of each indoor set is also inequality after making each indoor set according to corresponding side-play amount renewal original address, the realization system distributes the address from the trend indoor set, solved that the multi-connected air conditioner device can't distribute the problem of each address of indoor unit automatically in the prior art, and then reached the multi-connected air conditioner device distributes the address that has nothing in common with each other automatically to each indoor set effect.
Particularly, before first off-premises station is gathered the original address of the indoor set of each combined air conditioner in many combined air conditioners, address distribution method also comprises: the off-premises station of each combined air conditioner in many combined air conditioners is all gathered the original address of all indoor sets of the combined air conditioner at place, and the maximum original address in the original address that collects is sent to first off-premises station, namely, the original address of machine in each outer machine that overlaps combined air conditioner is responsible for collecting under this combined air conditioner system, and interior machine original address value maximum under the native system issued first off-premises station.
Then, first off-premises station receives the maximum original address of the indoor set of each combined air conditioner, and calculates the address offset amount of each combined air conditioner according to the maximum original address of the indoor set of the communication of each combined air conditioner order and each combined air conditioner.Under each of the first outdoor unit air conditioner communications platform composite sequence and each station composite air conditioner indoor unit address to calculate the maximum raw composite air conditioner units address offset illustrate : Suppose each station compound air conditioner communications order of first compound and the second compound air conditioner air conditioner , then the first outdoor unit air conditioner according to the Taiwan composite communication sequence and each station composite air conditioner indoor unit maximum raw address calculate the Taiwan composite air conditioner address offset comprises: a first composite outdoor unit air conditioner to determine first address offset is zero ; and the first outdoor unit determines that the first composite air conditioner indoor unit original address as the second largest hybrid air conditioner address offset ; assuming the Taiwan air conditioner communications composite order of first composite air conditioner, second and third composite composite air conditioner air conditioner , then the first outdoor unit air conditioner according to the Taiwan composite communication sequence and each station composite air conditioner indoor unit address to calculate the maximum raw composite air conditioner units address offset comprises: a first outdoor unit determines that the first composite air conditioner indoor unit address and the second largest original composite biggest air conditioner indoor unit address of the original composite air conditioner for the third address offset .conditioner calculates each combined air conditioner: the first off-premises station is determined the address offset amount that the maximum original address sum of the indoor set of the maximum original address of indoor set of the first combined air conditioner and the second combined air conditioner is the 3rd combined air conditioner.By that analogy.
Preferably, before first off-premises station is gathered the original address of the indoor set of each combined air conditioner in many combined air conditioners, address distribution method also comprises: first indoor set judges whether self has applied for original address, wherein, first indoor set is any indoor set in the multi-connected air conditioner device; And when the judgement of first indoor set self is not applied for original address, send request for data to the off-premises station corresponding with first indoor set, to obtain the original address of first indoor set, wherein, request for data can be the identification code of first indoor set, for indoor machine of air-conditioner, the identification code of each indoor set is all inequality.Generally speaking, before dispatching from the factory, interior machine the original address zero clearing perhaps can be removed interior machine original address order by special-purpose debugger issue after the project installation.Power on for the first time after the project installation, interior machine is from the outer machine applied address of the combined air conditioner system at its place of trend, and this address is the indoor set original address, and scope is 1～80.
Technical scheme by the preferred embodiment, guarantee that each indoor set of multi-connected air conditioner device is all to there being original address, avoid first off-premises station to cause the problem of the address offset amount mistake in computation of each combined air conditioner because of the original address that does not collect whole indoor sets, and then reached the effect that makes the multi-connected air conditioner device can distribute the identical address of each to each indoor set.
Fig. 3 is the flow chart according to the address distribution method of the multi-connected air conditioner air conditioner indoor machine of second embodiment of the invention, and as shown in Figure 3, the address distribution method of this embodiment is specially:
After unit powers on, any off-premises station of multi-connected air conditioner device judges whether self is set to " system 1 " outer machine (the master control off-premises station on the control function)." if system 1 " outer machine, then be responsible for coordinating communication sequential and the parts of overlapping outer machine more and control function, collect the interior machine address allocation information under all combined air conditioner units simultaneously, the number value of machine in system's 1 outer machine is collected under all combined air conditioner units, calculate the side-play amount of each combined air conditioner unit then, and side-play amount is handed down to corresponding combined air conditioner unit; " if not system 1 " outer machine, then outer machine changes operate as normal over to.
Any indoor set of multi-connected air conditioner device detects self whether to apply for " original address ".If application, then in machine send out the request for data bag give with this in machine be in outer machine in same the combined air conditioner, distribute " original address " for interior machine after the demand of machine applied address in outer machine is received.Interior machine obtains to change normal operation over to after " original address ".Wherein, interior machine uses the address chip of global unique addressing, with numbering as the original address of this equipment under this unit in system of the outside machine application of communication modes.
When machine carries out unified addressing under the commissioning staff need be to all units, by the button operation on " system 1 " outer machine, perhaps use special-purpose commissioning device to " system 1 " outer machine transmit operation order, side-play amount with each system after " system 1 " outer machine receives orders sends to corresponding system, executive address was offset after interior machine was received offset information, namely, after interior machine is received the side-play amount order, draw the final address of using of machine in this with " original address+side-play amount " algorithm, so realize the unified addressing of all interior machines under the multisystem.
Having 3 combined air conditioner units with multi-connected air conditioner device system is illustrated: supposing respectively has 64 interior machines under each unit in combined air conditioner unit 1, combined air conditioner unit 2 and the combined air conditioner unit 3.The address of each indoor set from 1 to 64 in the combined air conditioner unit 1, and the address need not be offset; The address offset 64 of each indoor set in the combined air conditioner unit 2, address from 65 to 128; The address offset 128 of each indoor set in the combined air conditioner unit 3, address from 129 to 192.The interior machine of whole engineering is realized automatic, unified addressing; Machine 1 is to interior machine 192 in directly seeing on long-range PC monitoring software interface.
In addition, the embodiment of the invention also provides a kind of multi-connected air conditioner device, and this air conditioner can be any air conditioner with off-premises station that the embodiment of the invention provides, and also can be any multi-connected air conditioner device that has adopted the address distribution method of the embodiment of the invention.
As can be seen from the above description, the present invention has realized the multi-connected air conditioner device distributes the address that has nothing in common with each other automatically to each indoor set effect.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the address distribution method of a multi-connected air conditioner air conditioner indoor machine, wherein, the multi-connected air conditioner device is made of many combined air conditioners, it is characterized in that, and described address distribution method comprises:
First off-premises station is gathered the original address of the indoor set of each combined air conditioner in described many combined air conditioners, wherein, and the master control off-premises station that described first off-premises station is described multi-connected air conditioner device;
Described first off-premises station is gathered the communication order of each combined air conditioner in described many combined air conditioners, and wherein, described communication order is corresponding with the sequence of addresses of described each combined air conditioner on the communication bus of described multi-connected air conditioner device; And
Described first off-premises station is according to the address offset amount of described each combined air conditioner of original address calculating of the indoor set of the communication of described each combined air conditioner order and described each combined air conditioner, and the address offset amount that calculates is sent to described each combined air conditioner respectively, so that the indoor set of described each combined air conditioner upgrades original address according to corresponding address offset amount respectively.
2. address distribution method according to claim 1 is characterized in that, before first off-premises station was gathered the original address of the indoor set of each combined air conditioner in described many combined air conditioners, described address distribution method also comprised:
The off-premises station of each combined air conditioner in described many combined air conditioners is all gathered the original address of all indoor sets of the combined air conditioner at place, and the maximum original address in the original address that collects is sent to described first off-premises station,
Wherein,
The original address that described first off-premises station is gathered the indoor set of each combined air conditioner in described many combined air conditioners comprises: described first off-premises station receives the maximum original address of the indoor set of described each combined air conditioner,
Described first off-premises station comprises according to the address offset amount that the original address of the indoor set of the communication of described each combined air conditioner order and described each combined air conditioner calculates described each combined air conditioner: described first off-premises station is according to the address offset amount of described each combined air conditioner of maximum original address calculating of the indoor set of the communication order of described each combined air conditioner and described each combined air conditioner.
3. address distribution method according to claim 2, it is characterized in that, when the communication of described each combined air conditioner was followed successively by first combined air conditioner and second combined air conditioner in proper order, described first off-premises station comprised according to the address offset amount of described each combined air conditioner of maximum original address calculating of the indoor set of the communication of described each combined air conditioner order and described each combined air conditioner:
Described first off-premises station determines that the address offset amount of described first combined air conditioner is zero; And
Described first off-premises station determines that the maximum original address of the indoor set of described first combined air conditioner is the address offset amount of described second combined air conditioner.
4. address distribution method according to claim 3, it is characterized in that, when the communication of described each combined air conditioner was followed successively by described first combined air conditioner, described second combined air conditioner and the 3rd combined air conditioner in proper order, described first off-premises station comprised according to the address offset amount of described each combined air conditioner of maximum original address calculating of the indoor set of the communication of described each combined air conditioner order and described each combined air conditioner:
Described first off-premises station is determined the address offset amount that the maximum original address sum of the indoor set of the maximum original address of indoor set of described first combined air conditioner and described second combined air conditioner is described the 3rd combined air conditioner.
5. address distribution method according to claim 1 is characterized in that, before first off-premises station was gathered the original address of the indoor set of each combined air conditioner in described many combined air conditioners, described address distribution method also comprised:
First indoor set judges whether self has applied for original address, and wherein, described first indoor set is any indoor set in the described multi-connected air conditioner device; And
When described first indoor set judgement self is not applied for original address, send request for data to the off-premises station corresponding with described first indoor set, to obtain the original address of described first indoor set.
6. address distribution method according to claim 5 is characterized in that, described request for data comprises: the identification code of described first indoor set.
7. the off-premises station of a multi-connected air conditioner device, wherein, the multi-connected air conditioner device is made of many combined air conditioners, it is characterized in that, and described off-premises station comprises:
First collecting unit is for the original address of the indoor set of gathering described many each combined air conditioner of combined air conditioner;
Second collecting unit, the communication order that is used for gathering described many each combined air conditioner of combined air conditioner, wherein, described communication order is corresponding with the sequence of addresses of described each combined air conditioner on the communication bus of described multi-connected air conditioner device; And
Computing unit, be used for the address offset amount according to described each combined air conditioner of original address calculating of the indoor set of the communication order of described each combined air conditioner and described each combined air conditioner, and the address offset amount that calculates is sent to described each combined air conditioner respectively, so that the indoor set of described each combined air conditioner upgrades original address according to corresponding address offset amount respectively.
8. a multi-connected air conditioner device is characterized in that, comprising: the described off-premises station of claim 7.
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| CN103943137A (en) * | 2014-03-06 | 2014-07-23 | 四川长虹电器股份有限公司 | Apparatus and method for storing and reading multi-coupled air conditioning addresses |
| CN104132425A (en) * | 2014-08-01 | 2014-11-05 | 广东美的暖通设备有限公司 | Removing method and system of indoor unit communication addresses in multi-split air conditioner system |
| CN104965473A (en) * | 2015-07-22 | 2015-10-07 | 广东美的暖通设备有限公司 | VRV air-conditioning system and automatic addressing method therefor based on CAN bus |
| CN106101299A (en) * | 2016-06-20 | 2016-11-09 | 海信（山东）空调有限公司 | Method for assigning address to indoor unit and multiple on-line system |
| CN106969856A (en) * | 2017-04-19 | 2017-07-21 | 郑州利凌电子科技有限公司 | A kind of update method of grain heap cable for measuring temperature |
| CN107062524A (en) * | 2017-02-27 | 2017-08-18 | 青岛海信日立空调系统有限公司 | A kind of indoor apparatus of air conditioner addressing method and air-conditioner controller, indoor apparatus of air conditioner |
| CN107517282A (en) * | 2017-08-08 | 2017-12-26 | 深圳创维空调科技有限公司 | A kind of method for assigning address to indoor unit, storage medium and multiple on-line system |
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