CN104251536B - One-to-many current loop communication method and communication device - Google Patents
One-to-many current loop communication method and communication device Download PDFInfo
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- CN104251536B CN104251536B CN201310269356.0A CN201310269356A CN104251536B CN 104251536 B CN104251536 B CN 104251536B CN 201310269356 A CN201310269356 A CN 201310269356A CN 104251536 B CN104251536 B CN 104251536B
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Abstract
The invention discloses a one-to-many current loop communication method and a communication device. The one-to-many current loop communication method comprises the following steps: an outdoor unit system transmits data to all indoor unit systems simultaneously through a current loop communication circuit, and specifies a reply indoor unit system; the specified reply indoor unit system transmits data to the outdoor unit system through the current loop communication circuit, and unspecified indoor unit systems enter dormant states and wake up autonomously at a next communication cycle when the outdoor unit system re-enters transmission according to a timing sequence requirement; communication between each indoor unit system and the outdoor unit system is realized through time-sharing polling. By adopting the one-to-many current loop communication method disclosed by the invention, low construction requirement can be kept, front and back compatibility is realized, and one-to-many expansion can be realized.
Description
Technical field
The present invention relates to current ring communication field, more particularly to a kind of current ring communication method of one-to-many and logical
News device.
Background technology
At present, simple one-to-one communication, is usually used electric current loop.Electric current loop is characterized in that, with electricity on order circuit
Stream whether there is to be identified, low to construction requirement with good anti-interference, does not require shielding, is not even required and current-carrying electricity
Source line isolation.But this kind of communication modes there is also some shortcomings, that is, the limited amount system for communicating is typically one-to-one, communication
Speed is low.
Existing complicated one-to-many communication, is usually used bus.Bus is characterized in that, the electric current very little in bus, with voltage
It is identified, advantage is that speed is fast, and all units of bus time-sharing mode can realize transmission-receiving function.But this kind of communication modes
Some shortcomings, i.e. poor anti-interference are there is also, technically line shielding is carried with differential driving and construction requirement, in addition will to job specfication
Ask high, any point leads to bus paralysis extremely.
Based on above description, the current ring communication method and communication device of a kind of one-to-many are needed badly.Can with the method
Retain relatively low construction requirement, it is compatible before and after realization, can realize that quantity is not too many one-to-many extension again.
The content of the invention
Based on problem above, it is an object of the invention to provide a kind of current ring communication method of one-to-many and communication dress
Put, with the method relatively low construction requirement can be retained, it is compatible before and after realization, can realize that quantity is not too many a pair again
Many extensions, and it is with low cost.
To solve above-mentioned technical problem, the present invention is employed the following technical solutions：
A kind of current ring communication method of one-to-many, outdoor machine system is by current-loop communication circuit simultaneously to all interiors
Machine system sends data, and specifies the indoor set system write in reply；The indoor set system write in reply is designated by electric current loop communication electricity
Road sends the data to outdoor machine system；Simultaneously unappropriated indoor set system enters dormancy and according to timing requirements next
Communication circulation, i.e., independently revive when outdoor machine system reenters transmission；By time-sharing polling realize each indoor set system with
Communication between outdoor machine system.
Preferably, the pair of many current ring communication methods are comprised the following steps,
S10：Outdoor machine system to all of indoor set system sends data, and specifies the indoor set system write in reply；
S20：All indoor set systems receive the data of outdoor machine system transmission, and judge have not in preset time T 1
There is successful data reception, if it succeeds, execution step S40, otherwise, then execution step S30；
S30：The indoor set system that is not successfully received abandons the data that receive and proceeds to resting state, and proceeds to step
S80；
S40：The indoor set system being properly received judges whether the data for receiving are identical with the geocoding of oneself, if
It is identical, that is, it is designated, then execution step S60, otherwise, that is, it is not designated, execution step S50；
S50：Unappropriated indoor set system proceeds to resting state, and proceeds to step S80；
S60：Appointed indoor set system is proceeded to outdoor machine system and sends the state of data, and proceeds to step S70；
S70：Outdoor machine system is proceeded to and receives the state of the data that indoor set system sends, and is judged in preset time T 2
Either with or without successful data reception, whether it is properly received, then again to indoor set system transmission data, that is, initiates a new round and lead to
News, come back to step S10；
S80：The indoor set system of outdoor data can not be properly received, and can be properly received but unappropriated indoor set system
System, into after dormancy over-time T2, autonomous revival reenters reception state, waits the communication of outdoor machine system next round to send out
Letter, comes back to step S20.
Preferably, the outdoor machine system communicates transmitting element by off-premises station respectively and off-premises station communicates receiving unit
Data are sent to all of indoor set system and time-sharing polling receives the data that each indoor set system sends；Described each interior
Machine system communicates transmitting element by indoor set respectively and indoor set communicates receiving unit and sends data and connect to outdoor machine system
Receive the data that outdoor machine system sends.
Preferably, all indoor set systems transmit data reality in the form of current impulse with the outdoor machine system
It is existing.
Preferably, described indoor set system is by geocoding, when realizing communicating time-sharing polling with outdoor machine system
Identification response.
Preferably, the outdoor machine system and indoor set system, by photoelectrical coupler forceful electric power circuit and light current are realized
The security isolation of digital circuit, and realize communicating the carrier wave of the detection of receiving unit and communication transmitting element with this；Or by three
Pole pipe is directly realized by detection and carrier wave.
Preferably, the process that the indoor set system forms current impulse with outdoor machine system is：
By the equivalent resistance for changing the signal driving current of itself to change whole loop, so as to change electric current loop in electricity
The size of stream, and then form current impulse.
A kind of current loop communication device of one-to-many, including outdoor machine system, two or more indoor set systems,
Connected by communication line between the outdoor machine system and described each indoor set system, be simultaneously between each indoor set system
Connection relation, is series relationship, multiple indoor set systems and common group of outdoor machine system between indoor set system and outdoor machine system
Into a current-loop communication circuit.
Preferably, the indoor set system includes：
Indoor set communicating circuit, it is used for sending and receiving for data；
Indoor set other input/output interfaces, it includes information gathering, load control and other communication interfaces；
Indoor set memory element, it is used to store the data of indoor set system；And
Used as the indoor set control unit of core, it is used to be controlled corresponding indoor set system, and software is realized patrolling
Collect control；
The outdoor machine system includes：
Off-premises station communicating circuit, it is used for sending and receiving for data；
Off-premises station other input/output interfaces, the other parts of outdoor machine system, including information gathering, load control and its
His communication interface；
Off-premises station memory element, it is used to store the data of outdoor machine system；And
Used as the off-premises station control unit of core, it is used to be controlled outdoor machine system, software-implemented logic control.
Preferably, the indoor set communicating circuit includes following part：
Indoor set communicates transmitting element, and it is used to send data to outdoor machine system；
Indoor set communicates receiving unit, and it is used to receive the data of outdoor machine system transmission；
The off-premises station communicating circuit includes following part：
Off-premises station communicates transmitting element, and it is used to send data to all indoor set systems；
Off-premises station communicates receiving unit, and it is used to receive the data that each indoor set system sends.
Beneficial effects of the present invention are, because in communication means of the present invention, outdoor machine system is to all of interior
Machine system sends data, and specifies the indoor set system write in reply；All indoor set systems receive the number of outdoor machine system transmission
According to, and judge in preset time T 1 either with or without successful data reception, if without successful data reception, indoor set system is lost
Abandon the data that receive and proceed to resting state；If successful data reception, and the data for receiving and the address of oneself are compiled
Code is checked, if differed with the geocoding of oneself, indoor set proceeds to resting state；If compiled with the address of oneself
Code-phase is same, and indoor set proceeds to the state that data are sent to off-premises station.So can retain relatively low construction requirement with the method,
It is compatible before and after realization, can realize that quantity is not that too many one-to-many extends again, and it is with low cost.
Description of the drawings
Fig. 1 is the one-to-many current ring communication method detail flowchart that the embodiment of the present invention one is provided；
Fig. 2 is the one-to-many current ring communication hardware circuit schematic diagram that the embodiment of the present invention one is provided；
Fig. 3（a）The transmitting element constituted based on photoelectrical coupler provided for the embodiment of the present invention one and receiving unit；
The electric current loop communication that Fig. 3 (b) embodiment of the present invention one is provided is a pair two of abstract graph.
In figure：
10th, outdoor machine system；20th, the first indoor set system；30th, the second indoor set system；
11st, off-premises station communication receiving unit；12nd, off-premises station communication transmitting element；13rd, off-premises station control unit；14th, it is outdoor
Machine memory element；15th, other input/output interfaces of off-premises station；16th, zero line；17th, communication terminal.
21st, indoor set communication receiving unit；22nd, indoor set communication transmitting element；23rd, indoor set memory element；24th, it is indoor
Machine control unit；25th, communication electric source；26th, zero line；27th, other input/output interfaces of indoor set；28th, communication terminal.
31st, indoor set communication receiving unit；32nd, indoor set communication transmitting element；33rd, indoor set memory element；34th, it is indoor
Machine control unit；35th, communication electric source；36th, zero line；37th, other input/output interfaces of indoor set；38th, communication terminal.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Fig. 2 is the one-to-many current ring communication hardware circuit schematic diagram that the embodiment of the present invention one is provided.Such as Fig. 2 institutes
Show, hardware circuit described in the present embodiment includes an outdoor machine system 10 and two indoor set systems, and respectively first is indoor
Machine system 20, the second indoor set system 30.The outdoor machine system 10 is connected with the first indoor set system 20 by bus, and
Be connected by bus with the second indoor set system 30.It is parallel relationship, indoor set system and room between each indoor set system
It is series relationship between outer machine system, multiple indoor set systems collectively constitute a current-loop communication circuit with outdoor machine system.
The outdoor machine system 10 can mutually be communicated by bus and two indoor set systems.Certainly, the quantity of indoor set system is simultaneously
Two are not limited to, can be with more than two.
Outdoor machine system includes that off-premises station communicates transmitting element and off-premises station communication receiving unit, and each indoor set system is equal
Transmitting element and indoor set communication receiving unit are communicated including indoor set.The outdoor machine system is sent out respectively by off-premises station communication
Receiving unit sends data to all of indoor set system and time-sharing polling receives each indoor set to send unit and off-premises station to communicate
The data that system sends；Described each indoor set system communicates transmitting element by indoor set respectively and indoor set communication receives single
Unit sends data and receives the data that outdoor machine system sends to outdoor machine system.
Specifically, the outdoor machine system 10 includes that an off-premises station communication receiving unit 11, off-premises station communication sends single
Unit 12, off-premises station control unit 13, off-premises station memory element 14, off-premises station other input/output interfaces 15, zero line 16 and communication
End 17.The off-premises station communication receiving unit 11 is used to receive the data that each indoor set system sends；Off-premises station communication sends
Unit 12 is used to send data to indoor set system；Off-premises station control unit 13 is core, and software here is performed, for outdoor
Machine system 10 is controlled, and it is connected to respectively off-premises station communication receiving unit 11, off-premises station communication transmitting element 12, off-premises station and deposits
Storage unit 14, off-premises station other input/output interfaces 15.Off-premises station memory element 14 is used for the journey used by outdoor machine system 10
Sequence code, communication data and various constants, variable are stored；Off-premises station other input/output interfaces 15 are used to realize outdoor
The other functions of machine system 10, such as information gathering, load control and other communication interfaces.
Communication terminal 17, off-premises station communication receiving unit 11, the off-premises station communication transmitting element 12 and zero of outdoor machine system 10
Line 16 is mutually contacted, and wherein off-premises station communication receiving unit 11, off-premises station communication transmitting element 12 out-of-order is required.
First indoor set system 20 includes an indoor set communication receiving unit 21, indoor set communication transmitting element
22nd, other input/output interfaces 27 of indoor set control unit 24, indoor set memory element 23, indoor set, zero line 26, communication electric
Source 25 and communication terminal 28.The indoor set communication receiving unit 21 is used to receive the data of the transmission of outdoor machine system 10；Indoor set
Communication transmitting element 22 is used to send data to outdoor machine system 10；Indoor set control unit 24 is core, and software here is performed,
For being controlled to the first indoor set system 20, it is connected to respectively indoor set communication receiving unit 21, indoor set communication and sends
Unit 22, indoor set memory element 23, indoor set other input/output interfaces 27.Indoor set memory element 23 is used for the first Room
Program code, communication data and various constants, variable used by interior machine system 20 is stored；Indoor set other input and output
Interface 27 is used to realize the other functions of indoor set system 20, such as information gathering, load control and other communication interfaces.
The zero line 26 of the first indoor set system 20, communication power supply 25, indoor set communication receiving unit 21, indoor set communication
Transmitting element 22, communication terminal 28 are mutually contacted, wherein indoor set communication receiving unit 21, the indoor set communication out-of-order of transmitting element 22
Require.
Second indoor set system 30 includes an indoor set communication receiving unit 31, indoor set communication transmitting element
32nd, other input/output interfaces 37 of indoor set control unit 34, indoor set memory element 33, indoor set, zero line 36, communication electric
Source 35 and communication terminal 38.The indoor set communication receiving unit 31 is used to receive the data of the transmission of outdoor machine system 10；Indoor set
Communication transmitting element 32 is used to send data to outdoor machine system 10；Indoor set control unit 34 is core, and software here is performed,
For being controlled to the second indoor set system 30, it is connected to respectively indoor set communication receiving unit 31, indoor set communication and sends
Unit 32, indoor set memory element 33, indoor set other input/output interfaces 37.；Indoor set memory element 33 is used for second
Program code, communication data and various constants, variable used by indoor set system 30 is stored；Other inputs of indoor set are defeated
Outgoing interface 37 is used to realize the other functions of indoor set system 30, such as information gathering, load control and other communication interfaces.
The zero line 36 of the second indoor set system 30, communication power supply 35, indoor set communication receiving unit 31, indoor set communication
Transmitting element 32, communication terminal 38 are mutually contacted, wherein indoor set communication receiving unit 31, the indoor set communication out-of-order of transmitting element 32
Require.
When outdoor machine system and the first indoor set system, the communication terminal 17 of the second indoor set system, communication terminal 28, communication terminal
38 interconnections, during using zero line altogether, electric current loop order circuit can just form closure order circuit；First indoor set system and second
The electric current loop order circuit of indoor set system forms parallel relationship；The electric current loop order circuit of indoor set system and outdoor machine system
Form series relationship.Electric current loop communication is directive, and series and parallel relation is relevant with this sense of current
In the present embodiment, such as Fig. 3（a）Shown, indoor set system is with outdoor machine system electric current circular current main composition,
The transmitting element constituted based on photoelectrical coupler and receiving unit.Realize forceful electric power circuit with light current numeral by photoelectrical coupler
The security isolation of circuit, and realize communicating the carrier wave of the detection of receiving unit and communication transmitting element with this.When pacifying in low pressure
When the whole audience is closed, required without security isolation, detection and carrier wave are directly realized by by audion.
During as transmitting element, the input side connection control unit of optocoupler, the outlet side of optocoupler is series at current loop
In, the single knife switch that can be abstracted into shown in Fig. 3 (b).
During as receiving unit, the outlet side connection control unit of optocoupler, the input side of optocoupler is series at current loop
In, the light emitting diode that can be abstracted into shown in Fig. 3 (b).
The big portion of core of existing control system is microelectronics integrated monolithic machine, is light current digital system circuit, is characterized in that voltage
Low, operating rate is high；The conventional strong power system circuit of its peripheral applications system, is characterized in that voltage is high, low-response, including the control of load
System output and the communication between single-chip microcomputer and single-chip microcomputer, need to be ensured safety reliability using isolation circuit, commonly use photoelectrical coupler, letter
Claim optocoupler, its principle is that the input side signal of telecommunication changes into light, and the signal of telecommunication is changed into again by light-sensitive element in outlet side, input
Without electrically connecting between side and outlet side, excellent insulation performance.
If space length is near between single-chip microcomputer, without the need for security isolation, it is possible to use audion realizes mutually communication；From logical
News circuit obtains the process of signal and is referred to as detection, and the process for applying a signal to communicating circuit is referred to as carrier wave.
A kind of current ring communication method of one-to-many of the present invention is that outdoor machine system passes through current-loop communication circuit
Simultaneously data are sent to all indoor set systems, and specify the indoor set system write in reply；It is designated the indoor set system write in reply to lead to
Overcurrent ring communicating circuit sends the data to outdoor machine system；Simultaneously unappropriated indoor set system enter dormancy and according to
Timing requirements are independently revived in next communication circulation when that is, outdoor machine system reenters transmission；Realized by time-sharing polling every
Communication between individual indoor set and off-premises station.
Fig. 1 is the one-to-many current ring communication method detail flowchart that the embodiment of the present invention one is provided.As shown in figure 1, this
The current ring communication method of the described one-to-many of invention, specifically includes following steps,
S10：Outdoor machine system 10 communicates transmitting element 12 and sends data to all of indoor set system by off-premises station, this
It is indoor set system 20, indoor set system 30 in embodiment, and specifies the indoor set system write in reply.
S20：The indoor set system 20, indoor set system 30 communicate receiving unit 21, indoor set and lead to by indoor set
News receiving unit 31 receives the data that outdoor machine system 10 sends, and judges interior either with or without being properly received number in preset time T 1
According to, if it succeeds, execution step S40, otherwise, then execution step S30.
S30：The indoor set system that is not successfully received abandons the data that receive and proceeds to resting state, and proceeds to step
S80。
S40：The indoor set system being properly received judges whether the data for receiving are identical with the geocoding of oneself, if
It is identical, that is, it is designated, then execution step S60, otherwise, that is, it is not designated, execution step S50.
S50：Unappropriated indoor set system proceeds to resting state, and proceeds to step S80.
S60：Appointed indoor set system is proceeded to outdoor machine system 10 and sends the state of data, and proceeds to step S70.
S70：Outdoor machine system 10 is proceeded to and receives the state of the data that indoor set system sends, and is judged in preset time T 2
It is interior to be whether properly received either with or without successful data reception, then initiate a new round to indoor set system transmission data again
Communication, comes back to step S10.
S80：The indoor set system of outdoor data can not be properly received, and can be properly received but unappropriated indoor set system
System, into after dormancy over-time T2, autonomous revival reenters reception state, waits the communication of the next round of outdoor machine system 10
Transmit, come back to step S20.
In the present embodiment, the indoor set system 20, indoor set system 30 transmit data with the outdoor machine system 10
Realized in the form of current impulse.The indoor set system 20, indoor set system 30 form current impulse with outdoor machine system 10
Process be：
By the equivalent resistance for changing the signal driving current of itself to change whole loop, so as to change electric current loop in electricity
The size of stream, and then form current impulse.
In the present embodiment, described all indoor set systems are realized and outdoor machine system communication point by geocoding
When poll when identification response.The realization of its geocoding, can be that hardware is selected, such as toggle switch, used as input；Can also
It is the communication process starting stage to compete to be formed automatically, there can be the autonomous competition of autonomous detection, or without autonomous detection
And need outdoor machine system to coordinate, the competition again for constantly reducing the scope is taken turns repeatedly more.
Such as Fig. 3（b）Shown, it is as follows that electric current loop communication implements process：
When transmitting without communication data under normality：The Com-Txd of all control unit outputs is low level, and indoor set communication is sent out
Unit 22, indoor set communication transmitting element 32 is sent to be closure state, off-premises station communicates transmitting element 12 for closure state, electric current loop
There is electric current in loop；Indoor set communication receiving unit 21, indoor set communication receiving unit 31 is luminous, off-premises station communication receiving unit
11 is luminous, and the Com-Rxd for being input into control unit is high level.
When off-premises station sends data：The Com-Txd of the output of off-premises station control unit 13 is high level, and off-premises station communication sends
Unit 12 be off-state, current loop no current；Off-premises station communication receiving unit 11, indoor set communication receiving unit 21,
Not light, the Com-Rxd for being input into control unit switchs to low level to indoor set communication receiving unit 31.Thus, outdoor machine system
10 transmission data can be successfully delivered to indoor set system 20, indoor set system 30, carry out coding with the pattern of pulse width logical
News.
Indoor set enters dormancy：It is not successfully received and unappropriated indoor set system enters dormancy according to sequential, now
The Com-Txd of indoor set control unit output is high level, in the process that the indoor set system of non-sleep state sends（It is close to
50% communication cycle）In be always high level, its time width be much larger than coded pulse width, the indoor set system is not to electric current
Loop back path provides electric current；And independently revive in next communication cycle period.
When indoor set sends data：Appointed indoor set system, when data are sent, is the room of unique non-sleep state
Interior machine system, the Com-Txd of indoor set control unit output is high level, and indoor set communication transmitting element is off-state, electric
Stream loop back path no current；Not light, the Com-Rxd for being input into control unit switchs to low level to off-premises station receiving unit 11.Thus,
Appointed indoor set system sends data and can be successfully delivered to outdoor machine system 10, is encoded with the pattern of pulse width
Communication.
For the electric current loop communication system of one-to-many, by the way of time-sharing polling, you can realize outdoor machine system and institute
There is the communication of indoor set system
In the present embodiment, preferably, the indoor set system is all powered by communication with power supply, without the need for outer power-up
Source.
In the present invention, described outdoor machine system is functionally in main frame status in Communication Control, and indoor set system exists
Communication Control is functionally in slave status.Electric current loop communication system is applied to by extending master-slave communication control function；Electric current
Ring host computer communication keep one it is constant, while extending electric current loop communicates slave to multiple.It is all to meet electric current loop communication one master and multiple slaves
It is all this patent interest field, however it is not limited to the indoor set or off-premises station of specific descriptions；On hardware is constituted, Main functional units
It is also equity.
The know-why of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and can not by any way be construed to limiting the scope of the invention.Based on explanation herein, the technology of this area
Personnel associate other specific embodiments of the present invention by need not paying performing creative labour, these modes fall within
Within protection scope of the present invention.
Claims (6)
1. a kind of current ring communication method of one-to-many, it is characterised in that outdoor machine system by current-loop communication circuit simultaneously
Data are sent to all indoor set systems, and specifies the indoor set system write in reply；The indoor set system write in reply is designated by electricity
Stream ring communicating circuit sends the data to outdoor machine system；Simultaneously unappropriated indoor set system enters dormancy and according to sequential
Require in next communication circulation, i.e., independently to revive when outdoor machine system reenters transmission；Each room is realized by time-sharing polling
Communication between interior machine system and outdoor machine system；
The method comprising the steps of,
S10：Outdoor machine system to all of indoor set system sends data, and specifies the indoor set system write in reply；
S20：All indoor set systems receive the data of outdoor machine system transmission, and judge preset time T 1 it is interior either with or without into
Work(receiving data, if it succeeds, execution step S40, otherwise, then execution step S30；
S30：The indoor set system that is not successfully received abandons the data that receive and proceeds to resting state, and proceeds to step S80；
S40：The indoor set system being properly received judges whether the data for receiving are identical with the geocoding of oneself, if phase
Together, that is, it is designated, then execution step S60, otherwise, that is, is not designated, execution step S50；
S50：Unappropriated indoor set system proceeds to resting state, and proceeds to step S80；
S60：Appointed indoor set system is proceeded to outdoor machine system and sends the state of data, and proceeds to step S70；
S70：Outdoor machine system proceeds to the state of the data that indoor set system sends that receives, and judges have not in preset time T 2
There is successful data reception, be whether properly received, then initiate new round communication to indoor set system transmission data again,
Come back to step S10；
S80：The indoor set system of outdoor data can not be properly received, and can be properly received but unappropriated indoor set system,
Into after dormancy over-time T2, autonomous revival reenters reception state, waits the communication of outdoor machine system next round to transmit,
Come back to step S20.
2. the current ring communication method of one-to-many according to claim 1, it is characterised in that the outdoor machine system difference
Transmitting element is communicated by off-premises station and off-premises station communicates receiving unit and sends data and timesharing wheel to all of indoor set system
Ask and receive the data that each indoor set system sends；Described each indoor set system respectively by indoor set communicate transmitting element and
Indoor set communicates receiving unit and sends data to outdoor machine system and receive the data that outdoor machine system sends.
3. the current ring communication method of one-to-many according to claim 1, it is characterised in that all indoor set systems
Realized in the form of current impulse with outdoor machine system transmission data.
4. the current ring communication method of one-to-many according to claim 1, it is characterised in that described indoor set system leads to
Geocoding is crossed, identification response when time-sharing polling is communicated with outdoor machine system is realized.
5. the current ring communication method of one-to-many according to claim 2, it is characterised in that the outdoor machine system and room
Interior machine system, by photoelectrical coupler the security isolation of forceful electric power circuit and light current digital circuit is realized, and realizes that communication connects with this
Receive the detection of unit and the carrier wave of communication transmitting element；Or detection and carrier wave are directly realized by by audion.
6. the current ring communication method of one-to-many according to claim 3, it is characterised in that the indoor set system and room
Outer machine system forms the process of current impulse：
By the equivalent resistance for changing the signal driving current of itself to change whole loop, so as to change electric current loop in electric current
Size, and then form current impulse.
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| CN106225105B (en) * | 2016-09-20 | 2022-03-01 | 广东美的制冷设备有限公司 | Current loop communication device and air conditioner |
| CN106569897B (en) * | 2016-11-07 | 2019-11-12 | 许继集团有限公司 | The polling method and device of shared bus based on collaborative multi-task scheduling mechanism |
| CN110608502B (en) * | 2019-09-10 | 2022-08-19 | 青岛海尔空调电子有限公司 | Air conditioner communication method based on single-wire half-duplex communication and air conditioner |
| CN111256219A (en) * | 2020-02-13 | 2020-06-09 | 海信（山东）空调有限公司 | Multi-split air conditioner |
| CN114076401B (en) * | 2021-10-09 | 2023-10-13 | 佛山市顺德区美的电子科技有限公司 | Communication circuit, electronic equipment and communication method |
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| CN2518016Y (en) * | 2001-12-31 | 2002-10-23 | 海信集团有限公司 | Corrent loop communicating circuit of frequency converting air conditioner |
| WO2010054506A1 (en) * | 2008-11-11 | 2010-05-20 | 深圳航天科技创新研究院 | Control system of multi- shaft servo motor |
| CN102043397A (en) * | 2009-10-21 | 2011-05-04 | 同方泰德国际科技(北京)有限公司 | Network communication method for building automation system |
| JP5808922B2 (en) * | 2011-03-16 | 2015-11-10 | 三菱電機株式会社 | Air conditioner control interface device, air conditioner and air conditioner control system |
| CN102761941B (en) * | 2011-04-28 | 2016-08-03 | 北京云天创科技有限公司 | A kind of method utilizing ultra-low power consumption wireless smart sensor's network protocol transmission |
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2013
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