CN104833055A - Method and device for transmitting data of multi-split air-conditioning system - Google Patents
Method and device for transmitting data of multi-split air-conditioning system Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 112
- 230000008859 change Effects 0.000 claims description 34
- 230000000052 comparative effect Effects 0.000 claims description 32
- 238000012546 transfer Methods 0.000 claims description 19
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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
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The invention discloses a method and a device for transmitting data of a multi-split air-conditioning system. The method comprises the following steps of receiving a data transmission instruction, and detecting a to-be-transmitted data string; comparing the to-be-transmitted data string with the last data string to obtain the comparison result; according to the comparison result, transmitting the data with changed parameter value through a field bus. Due to the fact that the transmitted data string is compared with the last data string, only the changed data is transmitted, and the data which is not changed is not transmitted, so that the transmission amount of the data is reduced, and meanwhile, the integrity of the data is guaranteed, and the communication speed of an outdoor unit and an indoor unit is increased.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to the method and apparatus of a kind of multi-online air-conditioning system data transmission.
Background technology
The main feature of multi-online air-conditioning system is that the outer machine of multiple stage connects machine in multiple stage and the refrigerating circuit system that forms.Due to multi-online air-conditioning system normally one or more off-premises station drag tens of indoor sets.Indoor set and off-premises station pass through bus communication.In the fieldbus networks that indoor set and off-premises station form, number of nodes is many, between off-premises station and indoor set, and communication data amount between indoor set and indoor set is large, therefore the status information causing off-premises station to obtain whole indoor set often needs for a long time, and this greatly reduces the real-time that air-conditioning system is run.Especially along with the development of multi-online air-conditioning system, the quantity that off-premises station drags indoor set gets more and more, and the real time problems of multi-online air-conditioning system is more serious.
Summary of the invention
Based on this, be necessary the problem for the Realtime Capability of Communication difference in conventional art between off-premises station and indoor set, the method and apparatus that a kind of pointed multi-gang air-conditioner unit data are transmitted is provided.
For realizing the method for the data transmission of a kind of multi-online air-conditioning system that the object of the invention provides, comprise the following steps:
Receive data transfer instruction, and detect data to be transmitted string;
Data to be transmitted string and last transmission data string are compared, obtains comparative result;
According to described comparative result, the data changed by parameter value are transmitted by fieldbus.
As the embodiment of a kind of method that data of multi-online air-conditioning system are transmitted, also comprise following two or any one step:
According to described comparative result, the data remained unchanged by parameter value abandon;
After obtaining described comparative result, store described data to be transmitted string as new last transmission data string.
As the embodiment of a kind of method that data of multi-online air-conditioning system are transmitted, further comprising the steps of:
According to the data that described parameter value changes, data corresponding in described last transmission data string are replaced, form new last transmission data.
As the embodiment of a kind of method that data of multi-online air-conditioning system are transmitted, when the described data changed by parameter value are transmitted by fieldbus, the actual transmissions data transmitted comprise the data that data positional information and parameter value change.
As the embodiment of a kind of method that data of multi-online air-conditioning system are transmitted, further comprising the steps of:
According to described comparative result, calculate often organize data that continuous print parameter value do not change do not become data length;
The explanation data length whether data length is more than or equal to described data descriptive information is not become described in judgement;
If so, the data that current group of parameter value does not change then are not sent;
If not, then the data that current group of parameter value does not change are sent.
As the embodiment of a kind of method that data of multi-online air-conditioning system are transmitted, before the method carries out data transmission, form transmission data string by needing in indoor set each in multiple on-line system and each off-premises station to be placed in a continuous print interval according to the data that the probability size changed carries out sorting or being exceeded by the probability that changes preset value by the long numeric data of bus transfer.
Based on the device that the data of a kind of multi-online air-conditioning system of same inventive concept are transmitted, this device comprises command reception module, data comparison module and delta data sending module, wherein:
Described command reception module, is configured to receive data transfer instruction, and detects data to be transmitted string;
Described data comparison module, is configured to data to be transmitted string and last transmission data string to compare, obtains comparative result;
Described delta data sending module, be configured to according to described comparative result, the data changed by numerical value are sent to fieldbus, transmit data by fieldbus.
As the embodiment of the device that a kind of data of multi-online air-conditioning system are transmitted, also comprise data discard processing module and/or memory module;
Described data discard processing module, be configured to the comparative result obtained according to described data comparison module, the data remained unchanged by parameter value abandon;
Described memory module, is configured to after described data comparison module obtains described comparative result, stores described data to be transmitted string as new last transmission data string.
As the embodiment of the device that a kind of data of multi-online air-conditioning system are transmitted, the data that numerical value changes by described delta data sending module are sent to fieldbus, when carrying out data transmission by described fieldbus, the actual transmissions data of described transmission comprise the data that data descriptive information and numerical value change, and described data descriptive information comprises data address information and data length information;
Also comprise in this device:
Non-parameter, according to length detection module, is configured to the comparative result according to described data comparison module, calculates the non-delta data length often organizing the data that continuous print parameter value does not change;
Do not become data length comparison module, be configured to, according to the testing result of described non-parameter according to length detection module, described in judgement, not become the explanation data length whether data length is more than or equal to described data descriptive information;
Do not become data processing module, be configured to according to the described result not becoming data length comparison module, when described do not become data length be more than or equal to described explanation data length time, then do not send the data that current group of parameter value does not change; When described do not become data length be less than described explanation data length time, then send the data that current group of parameter data values does not change.
As the embodiment of the device that a kind of data of multi-online air-conditioning system are transmitted, this device, before carrying out data transmission, forms transmission data string by needing in indoor set each in multiple on-line system and each off-premises station to be placed in a continuous print interval according to the data that the probability size changed carries out sorting or being exceeded by the probability that changes preset value by the long numeric data of bus transfer.
Beneficial effect of the present invention comprises: the method and the device that the invention provides a kind of data transmission of multi-online air-conditioning system.Compared by serial data that this is transmitted and the front serial data once transmitted, only transmit the data changed, and do not transmit the data do not changed, thus reduce the transmission quantity of data, ensure that the integrality of data simultaneously.Improve the speed of off-premises station and indoor set communication.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of a specific embodiment of the device of the data transmission of a kind of multi-online air-conditioning system of the present invention;
Fig. 2 is the schematic diagram that the off-premises station of multi-online air-conditioning system is connected by fieldbus with indoor set;
Fig. 3 is the schematic diagram of the device of the data transmission all arranging multi-online air-conditioning system of the present invention in multi-online air-conditioning system in off-premises station and indoor set;
Fig. 4 is the system architecture schematic diagram of another specific embodiment of the device of the data transmission of a kind of multi-online air-conditioning system of the present invention;
Fig. 5 is the system architecture schematic diagram of a specific embodiment again of the device of the data transmission of a kind of multi-online air-conditioning system of the present invention;
Fig. 6 is that the device of the data transmission of a kind of multi-online air-conditioning system of the present invention carries out data transmission by fieldbus, and data for during one-dimension storage transmit the structural representation of data;
Fig. 7 is that the device of the data transmission of a kind of multi-online air-conditioning system of the present invention carries out data transmission by fieldbus, and data for during two-dimensional storage transmit the structural representation of data;
Fig. 8 is the system architecture schematic diagram of a specific embodiment again of the device of the data transmission of a kind of multi-online air-conditioning system of the present invention;
Fig. 9 is the flow chart of a specific embodiment of the method for the data transmission of a kind of multi-online air-conditioning system of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, be described below in conjunction with the detailed description of the invention of accompanying drawing to the method that the data of multi-online air-conditioning system of the present invention are transmitted.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The device of the data transmission of the multi-online air-conditioning system of one embodiment of the invention, as shown in Figure 1, this device 100 comprises command reception module 110, data comparison module 120 and delta data sending module 130.Wherein: command reception module 110, be configured to receive data transfer instruction, and detect data to be transmitted; Data comparison module 120, is configured to data to be transmitted string and last transmission data string to compare, obtains comparative result; Delta data sending module 130, be configured to according to described comparative result, the data changed by numerical value are sent to fieldbus, transmit data by fieldbus.
It should be noted that, multiple on-line system comprises multiple stage indoor set and multiple stage off-premises station herein.Every platform indoor set or off-premises station are all connected with fieldbus, as a node by field bus communication.As shown in Figure 2, be the schematic diagram of multiple on-line system in an instantiation, in this example, total w platform off-premises station and u platform indoor set are connected with fieldbus 101, are all connected by fieldbus between these indoor sets and off-premises station.When the device adopting the data of multi-online air-conditioning system of the present invention to transmit controls the multiple on-line system shown in Fig. 2, as shown in Figure 3, a set of device of the present invention is set respectively in every platform off-premises station and every platform indoor set, thus makes each node in bus carry out data transmission by fieldbus under the control of device of the present invention.
Specifically fieldbus is being utilized to carry out in data transmission procedure, every platform off-premises station or indoor set be not when taking bus, always take bus in wait, after taking fieldbus, only just bring into use device of the present invention to carry out the work for the treatment of of data transmission.In embodiments of the present invention, suppose that indoor set 3 starts to take bus, command reception module 110 in the data transmission device 100 of the then multi-online air-conditioning system of machine 3 inside disposed in the interior can receive bus and take, start the instruction of data transmission, after it receives instruction, detect that indoor set 3 is current needs the data to be transmitted string being transferred to off-premises station by fieldbus at once.After command reception module 110 detects that indoor set 3 needs to be transferred to the data to be transmitted of off-premises station, data transfer can be further processed to data comparison module 120.Data to be transmitted string and last transmission data string (serial data that a upper cycle indoor set 3 is transmitted to off-premises station by fieldbus) compare by data comparison module 120, and whether both judgements time has difference, and specifically which data has difference.Afterwards, numerical value (is not refered in particular to the numerical value representing population size herein by delta data sending module 130, and refer to any aspect distinguishing two things) data that change are sent to fieldbus, and are sent to one or more in w off-premises station by fieldbus.And do not send the data that numerical value does not have method phase change.Certainly, corresponding parameter, after receiving the next data of indoor set 3 transmission, can be changed according to the position of correspondence by off-premises station.
Data comparison module 120 is when carrying out comparing herein, by byte as unit, can carry out the whether identical comparison of numerical value by byte.Certainly also can adopt other unit as a comparison, it will be understood by those skilled in the art that the unit compared is less, then what divide is thinner, and the data that need not transmit are also more, but accordingly, needs the position description data of transmission also more.Therefore, the unit of concrete comparing can determine according to actual conditions, also can directly use byte as the unit compared.
The device of the data transmission of the multi-online air-conditioning system of the embodiment of the present invention, compared by serial data that this is transmitted and the front serial data once transmitted, only transmit the data changed, and do not transmit the data do not changed, thus reduce the transmission quantity of data, ensure that the integrality of data simultaneously.
In addition, preferably, initialization data table is all stored in indoor set and off-premises station, the parameter value under current indoor machine or normal operating condition corresponding to off-premises station is included in tables of data, when off-premises station or indoor set first passage fieldbus carry out data transmission, the data to be transmitted string of its first secondary transmission of minute book, and the parameter value in data to be transmitted string and initialization data table is compared, namely, when indoor set or off-premises station take fieldbus first, its front transmission data string is the serial data (each parameter value by preset order arrangement) in initialization data table.Adopt value under off-premises station or indoor set normal operating condition as the parameter value in initiation parameter table herein, make the data volume of off-premises station or the indoor set parameter value variation when taking fieldbus first minimum, when ensureing that indoor set or off-premises station first time take fieldbus, also burden can not be caused to bus, especially, when whole unit powers on, most indoor set and off-premises station take bus at first time.
As a kind of embodiment, see Fig. 4, the device of the data transmission of multi-online air-conditioning system of the present invention, data discard processing module 140 can also be comprised, it is configured to the comparative result obtained according to data comparison module 120, the data remained unchanged by parameter value abandon, and namely delete and do not re-use.
It should be noted that herein, as shown in Figure 4, data to be transmitted string and last data string compare by data comparison module 120, after obtaining comparative result, data discard processing module 140 and delta data transport module 130 process different data respectively, outwards sent by fieldbus by the vicissitudinous data of parameter value, do not had by parameter value vicissitudinous data to transfer to data discard processing module 140 to abandon (delete, do not transmit).In addition, described data discard module also can with described data comparison module 120 cooperative cooperating, do not have vicissitudinous data then directly to transfer to described data discard module to delete as long as data comparison module 120 retrieves parameter value.And the data that parameter value changes can be transported to fieldbus transmission by delta data transport module 130 in the lump after the whole comparison of current data to be transmitted string.
Also it should be noted that herein, in system as shown in Figure 3, device independent operating in every platform indoor set or off-premises station, the data comparison module 120 in each device is as last transmission data string by the data once transmitted before himself indoor set or off-premises station.
In addition, as shown in Figure 5, can also memory module 150 be set in a device, in order to after described data comparison module obtains described comparative result, stores described data to be transmitted string as new last transmission data string.Certainly, original last transmission data string is also stored in described memory module.Preferably, according to the last transmission data string stored in the comparative result synchronized update memory module 150 of data comparison module 120, only need the data changed in the original last transmission data string stored can be replaced.
For the multi-online air-conditioning system being carried out data transmission between off-premises station and indoor set by fieldbus, bus data transfer frame format, as shown in Figure 6, generally comprises address information, data type, data and error checking.Device of the present invention parameter value variation number according in being transmitted across into, packet, containing two parts content, is respectively the data that data positional information and numerical value change.Wherein, the positional information of data is divided into two kinds of situations, when off-premises station and indoor set send and accept to be stored with the form of one-dimensional data table by the data of fieldbus, the position of the data transmitted is determined by the original position and data length transmitting data, namely data positional information comprises the enlightenment position of data and the transmission length of data, is the actual data that will transmit after data length.When tables of data be two dimension time, as shown in Figure 7, the positional information of data by original position X-coordinate and the Y-coordinate that will transmit data, and transmission data final position X-coordinate and Y-coordinate determine, transmission data final position Y-coordinate after be actual data value.
During due to transmission data, through contrast, a part of data are dropped, therefore are often positional information and the actual data value composition of multiple transmission data in actual transmissions data.For the data bits that the positional information of data in transmitting procedure is used, when tables of data is one dimension, data original position A bit representation, the transmission length n N bit representation of data, data are n byte.When tables of data is two dimension, transmission data original position x
scoordinate and y
scoordinate uses X respectively
startposition and Y
startbit representation, transmission data final position x
ecoordinate and y
ecoordinate uses X respectively
endposition and Y
endbit representation, data are (x
e-x
s) * (y
e-y
s) individual byte.As can be seen here, abandon the explanation that data all can increase Data Position, when tables of data is one dimension, the explanation of Data Position needs (A+N) position at every turn; When tables of data is two dimension, the explanation of Data Position needs (X
start+ Y
start+ X
start+ X
end) position.Therefore, in order to make transmission data as far as possible continuously, can at device of the present invention before carrying out data transmission, form transmission data string by needing in indoor set each in multiple on-line system and each off-premises station to be placed in a continuous print interval according to the data that the probability size changed carries out sorting or being exceeded by the probability that changes preset value by the long numeric data of bus transfer.The probability size changed according to data sorts, then the data of continuous multiple byte of possibility high rate of change all need to transmit, same, the data of multiple bytes of low rate of change may not need transmission, can save a large amount of byte representing the positional information of data like this.
Concrete, when transmitting N number of data, normal transmission form is:
Address information+data type+Data Position+N+ data 1+ data 2 ... + data N+ error checking.Total transmission length is 1+1+1+1+N+1=5+N.
Contrast current data and upper secondary data, find that there is the individual data of m (m<N) different, then only pass this m data.Data Position characterizes the positional information of aforesaid data herein.For one-dimensional data transformat:
(1) if the data of this m change are continuous print, then transformat is:
Address information+data type+Data Position+m+ data 1+ data 2 ... + data m+ error checking.Total transmission length is 1+1+1+1+m+1=5+m.In this case N-m data can be transmitted less.
(2) if k is continuously individual before the data of this m change, rear (m-k) is continuously individual, then transformat is:
Address information+data type+Data Position 1+k+ data 1+ data 2+ ... + data k+ Data Position 2+ (m-k)+data k+1+ data k+2+ ... + data m+ error checking.Total transmission length is 1+1+1+1+k+1+1+ (m-k)+1=m+7.In this case than the many biographies of the situation of (1) two data.If the data of visible change, there is once discontinuous situation in its position, increase by two data needed transmission.
(3) if in the data of this m change, discontinuous data section L, 2*L number is namely increased reportedly defeated.Then transformat is:
Address information+data type+Data Position 1+a+ data 1+ ... + data a+ Data Position 2+b+ data (a+1)+data (a+b)+Data Position 3+c+ data (a+b+1)+... + data (a+b+c)+Data Position 4+d+ data (a+b+c+1)+... + data (a+b+c+d)+... + Data Position L+l+ data (m-l)+... + data m+ error checking.Wherein a+b+c+d+ ... + l=m, total transmission length is (m+5+2L).When (m+5+2L) is greater than N, the data length of transmission is on the contrary than all transmission is longer.
For solving the problem, better, as shown in Figure 8, non-parameter can also be set up in the apparatus of the present according to length detection module 161, in order to the comparative result according to data comparison module 120, calculate the non-delta data length often organizing the data that continuous print parameter value does not change; Do not become data length comparison module 162, in order to according to the testing result of described non-parameter according to length detection module, described in judgement, do not become the explanation data length whether data length is more than or equal to described data descriptive information; And, do not become data processing module 163, in order to according to the described result not becoming data length comparison module, when described do not become data length be more than or equal to described explanation data length time, then do not send the data that current group of parameter value does not change; When described do not become data length be less than described explanation data length time, then send the data that current group of parameter data values does not change.Thus the device volume of transmitted data that the data of the multi-online air-conditioning system of the embodiment of the present invention can be made to transmit is minimum, promote the speed of the synchronizing information between off-premises station and indoor set.
Based on same inventive concept, a kind of method that the present invention also provides data of multi-online air-conditioning system to transmit, the principle of dealing with problems due to the method is similar to the apparatus function that the data of aforementioned a kind of multi-online air-conditioning system are transmitted, therefore, the enforcement of the method by the Implement of Function Module of aforementioned means, can repeat part and repeats no more.
The method of the data transmission of the multi-online air-conditioning system of one embodiment of the invention, as shown in Figure 9, comprises the following steps:
S100, receives data transfer instruction, and detects data to be transmitted string.
S200, compares data to be transmitted string and last transmission data string, obtains comparative result.
S300, according to described comparative result, the data changed by parameter value are transmitted by fieldbus.
The method of the data transmission of the multi-online air-conditioning system of the embodiment of the present invention, is stored in each off-premises station of multi-online air-conditioning system and the control assembly of indoor set by program mode (PM).Connected by control assembly and communication interface and fieldbus.The method, by the serial data of this transmission and the front serial data once transmitted being compared, is only transmitted the data changed, and is not transmitted the data do not changed, thus reduce the transmission quantity of data, ensure that the integrality of data simultaneously.Improve off-premises station in multi-online air-conditioning system and obtain the speed of indoor set status information.
According to the comparison of step S200, according to described comparative result, the data that parameter value remains unchanged can be abandoned, not transmit.The data changed by parameter value are recorded in transmitting data stream, and the data that parameter value does not change are not counted in.
In addition, in order to compare next data transfer, at completing steps S200, after obtaining comparative result, store current transmission data string of comparing as new last transmission data string.Certainly, for the storage of new last transmission data string, also the data that change of operation parameter value directly can be replaced by data corresponding in described last transmission data string, form new last transmission data.
In order to recipient can accurately identify and the data upgraded, when the data changed by parameter value are transmitted by fieldbus, the actual transmissions data transmitted comprise the data that the positional information of data and parameter value change.As indoor set transfer data to off-premises station by fieldbus time, the data that off-premises station can be changed according to parameter value by the positional information of the data in the data that receive upgrade last data accurately.
Preferably, wherein in an embodiment, further comprising the steps of:
S401, according to described comparative result, calculate often organize data that continuous print parameter value do not change do not become data length.
S402, does not become the explanation data length whether data length is more than or equal to described data descriptive information described in judgement.
S403, does not if so, then send the data that current group of parameter value does not change.
S404, if not, then sends the data that current group of parameter value does not change.
The method of the embodiment of the present invention compares the true data volume of transmission that needs, the communication selecting the minimum mode of volume of transmitted data to take data/address bus to carry out between indoor set and off-premises station, bus occupancy is minimum, improves the internal data transfer efficiency of whole multi-online air-conditioning system.
In addition, the data changed to make parameter value connect together as far as possible, reduce the proportion shared by positional information of data.Can before the method carry out data transmission, form transmission data string by needing in indoor set each in multiple on-line system and each off-premises station to be placed in a continuous print interval according to the data that the probability size changed carries out sorting or being exceeded by the probability that changes preset value by the long numeric data of bus transfer.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, and in each off-premises station being arranged on multi-online air-conditioning system or indoor set.This program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a method for the data transmission of multi-online air-conditioning system, is characterized in that, comprise the following steps:
Receive data transfer instruction, and detect data to be transmitted string;
Data to be transmitted string and last transmission data string are compared, obtains comparative result;
According to described comparative result, the data changed by parameter value are transmitted by fieldbus.
2. the method for the data transmission of multi-online air-conditioning system according to claim 1, is characterized in that, also comprise following two or any one step:
According to described comparative result, the data remained unchanged by parameter value abandon;
After obtaining described comparative result, store described data to be transmitted string as new last transmission data string.
3. the method for the data transmission of multi-online air-conditioning system according to claim 1, is characterized in that, further comprising the steps of:
According to the data that described parameter value changes, data corresponding in described last transmission data string are replaced, form new last transmission data.
4. the method for the data transmission of the multi-online air-conditioning system according to any one of claims 1 to 3, it is characterized in that, when the described data changed by parameter value are transmitted by fieldbus, the actual transmissions data transmitted comprise the data that data positional information and parameter value change.
5. the method for the data transmission of multi-online air-conditioning system according to claim 4, is characterized in that, further comprising the steps of:
According to described comparative result, calculate often organize data that continuous print parameter value do not change do not become data length;
The explanation data length whether data length is more than or equal to described data descriptive information is not become described in judgement;
If so, the data that current group of parameter value does not change then are not sent;
If not, then the data that current group of parameter value does not change are sent.
6. the method for the data transmission of multi-online air-conditioning system according to claim 1, it is characterized in that, before the method carries out data transmission, form transmission data string by needing in indoor set each in multiple on-line system and each off-premises station to be placed in a continuous print interval according to the data that the probability size changed carries out sorting or being exceeded by the probability that changes preset value by the long numeric data of bus transfer.
7. a device for the data transmission of multi-online air-conditioning system, it is characterized in that, this device comprises command reception module, data comparison module and delta data sending module, wherein:
Described command reception module, is configured to receive data transfer instruction, and detects data to be transmitted string;
Described data comparison module, is configured to data to be transmitted string and last transmission data string to compare, obtains comparative result;
Described delta data sending module, be configured to according to described comparative result, the data changed by numerical value are sent to fieldbus, transmit data by fieldbus.
8. the device of the data transmission of multi-online air-conditioning system according to claim 7, is characterized in that, also comprise data discard processing module and/or memory module;
Described data discard processing module, be configured to the comparative result obtained according to described data comparison module, the data remained unchanged by parameter value abandon;
Described memory module, is configured to after described data comparison module obtains described comparative result, stores described data to be transmitted string as new last transmission data string.
9. the device of the data transmission of the multi-online air-conditioning system according to claim 7 or 8, it is characterized in that, the data that numerical value changes by described delta data sending module are sent to fieldbus, when carrying out data transmission by described fieldbus, the actual transmissions data of described transmission comprise the data that data descriptive information and numerical value change, and described data descriptive information comprises data address information and data length information;
Also comprise in this device:
Non-parameter, according to length detection module, is configured to the comparative result according to described data comparison module, calculates the non-delta data length often organizing the data that continuous print parameter value does not change;
Do not become data length comparison module, be configured to, according to the testing result of described non-parameter according to length detection module, described in judgement, not become the explanation data length whether data length is more than or equal to described data descriptive information;
Do not become data processing module, be configured to according to the described result not becoming data length comparison module, when described do not become data length be more than or equal to described explanation data length time, then do not send the data that current group of parameter value does not change; When described do not become data length be less than described explanation data length time, then send the data that current group of parameter data values does not change.
10. the device of the data transmission of multi-online air-conditioning system according to claim 7, it is characterized in that, this device, before carrying out data transmission, forms transmission data string by needing in indoor set each in multiple on-line system and each off-premises station to be placed in a continuous print interval according to the data that the probability size changed carries out sorting or being exceeded by the probability that changes preset value by the long numeric data of bus transfer.
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