CN104251536A - 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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- CN104251536A CN104251536A CN201310269356.0A CN201310269356A CN104251536A CN 104251536 A CN104251536 A CN 104251536A CN 201310269356 A CN201310269356 A CN 201310269356A CN 104251536 A CN104251536 A CN 104251536A
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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 specifically, relate to a kind of current ring communication method and communication device of one-to-many.
Background technology
At present, communication simply one to one, uses electric current loop usually.The feature of electric current loop is, on order circuit with electric current with or without identifying, there is good anti-interference, low to construction requirement, do not require shielding, even require to isolate with current-carrying power line.But also there are some shortcomings, i.e. the limited amount system of communication in this kind of communication modes, normally one to one, communication speed is low.
Existing complicated one-to-many communication, uses bus usually.The feature of bus is that electric current is very little in bus, identifies with voltage, and advantage is that speed is fast, and all unit of bus time-sharing mode can realize transmission-receiving function.But this kind of communication modes also exists some shortcomings, i.e. poor anti-interference, technically carry line shielding with differential driving and construction requirement, require high to job specfication in addition, any point can cause bus to be paralysed extremely.
Based on above description, need a kind of current ring communication method and communication device of one-to-many badly.Use the method can retain lower construction requirement, compatible before and after realizing, can realize again quantity is not too many one-to-many expansion.
Summary of the invention
Based on above problem, the object of the present invention is to provide a kind of current ring communication method and communication device of one-to-many, use the method can retain lower construction requirement, compatible before and after realizing, can realize again quantity is not too many one-to-many expansion, and with low cost.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A current ring communication method for one-to-many, outdoor machine system sends data to all indoor set systems by current-loop communication circuit simultaneously, and specifies the indoor set system of writing in reply; Be designated the indoor set system of writing in reply and send the data to outdoor machine system by current-loop communication circuit; Unappropriated indoor set system enters dormancy and circulates in next communication according to timing requirements simultaneously, independently revives when namely outdoor machine system reenters transmission; The communication between each indoor set system and outdoor machine system is realized by time-sharing polling.
As preferably, the current ring communication method of described one-to-many comprises the following steps,
S10: outdoor machine system sends data to all indoor set systems, and specify the indoor set system of writing in reply;
S20: all indoor set systems all receive the data that outdoor machine system sends, and judge whether have successful data reception in preset time T 1, if success, then performs step S40, otherwise, then perform step S30;
S30: the indoor set system of unsuccessful reception abandons the data that receive and proceeds to resting state, and proceeds to step S80;
S40: the indoor set system that success receives judges that whether the data received are identical with the geocoding of oneself, if identical, is namely designated, then perform step S60, otherwise, be not namely designated, perform step S50;
S50: unappropriated indoor set system proceeds to resting state, and proceeds to step S80;
S60: appointed indoor set system proceeds to the state sending data to outdoor machine system, and proceeds to step S70;
S70: outdoor machine system proceeds to the state receiving the data that indoor set system sends, and judge whether have successful data reception in preset time T 2, no matter whether successfully receive, then again send data to indoor set system, namely initiate new round communication, come back to step S10;
S80: the indoor set system that successfully can not receive outdoor data, and can successfully receive but unappropriated indoor set system, after entering dormancy overtime T2, independently revive, reenter accepting state, wait for that the communication of outdoor machine system next round transmits, come back to step S20.
As preferably, described outdoor machine system sends data and time-sharing polling respectively by off-premises station communication transmitting element and off-premises station communication receiving element to all indoor set systems and receives the data that each indoor set system sends; Described each indoor set system sends the data of data and the transmission of reception outdoor machine system respectively by indoor set communication transmitting element and indoor set communication receiving element to outdoor machine system.
As preferably, described all indoor set systems and described outdoor machine system transmit data and realize with the form of current impulse.
As preferably, described indoor set system, by geocoding, realizes responding with identification during outdoor machine system communication time-sharing polling.
As preferably, described outdoor machine system and indoor set system, realize the Secure isolation of forceful electric power circuit and light current digital circuit by photoelectrical coupler, and realize the detection of communication receiving element and the carrier wave of communication transmitting element with this; Or directly realize detection and carrier wave by triode.
As preferably, the process that described indoor set system and outdoor machine system form current impulse is:
Changed the equivalent resistance in whole loop by the signal drive current changing self, thus change the size of electric current in electric current loop, and then form current impulse.
A kind of current loop communication device of one-to-many, comprise outdoor machine system, two or more indoor set system, connected by communication line between described outdoor machine system and described each indoor set system, parallel relationship between each indoor set system, be series relationship between indoor set system and outdoor machine system, multiple indoor set system and outdoor machine system form a current-loop communication circuit jointly.
As preferably, described indoor set system comprises:
Indoor set communicating circuit, its transmission for data and reception;
Other input/output interfaces of indoor set, it comprises information gathering, load controls and other communication interfaces;
Indoor set memory cell, it is for storing the data of indoor set system; And
As the indoor set control unit of core, it is for controlling corresponding indoor set system, and software-implemented logic controls;
Described outdoor machine system comprises:
Off-premises station communicating circuit, its transmission for data and reception;
Other input/output interfaces of off-premises station, other parts of outdoor machine system, comprise information gathering, load control and other communication interfaces;
Off-premises station memory cell, it is for storing the data of outdoor machine system; And
As the off-premises station control unit of core, it is for controlling outdoor machine system, and software-implemented logic controls.
As preferably, described indoor set communicating circuit comprises with lower part:
Indoor set communication transmitting element, it is for sending data to outdoor machine system;
Indoor set communication receiving element, its data sent for receiving outdoor machine system;
Described off-premises station communicating circuit comprises with lower part:
Off-premises station communication transmitting element, it is for sending data to all indoor set systems;
Off-premises station communication receiving element, its data sent for receiving each indoor set system.
Beneficial effect of the present invention is, due in communication means of the present invention, outdoor machine system sends data to all indoor set systems, and specifies the indoor set system of writing in reply; All indoor set systems all receive the data that outdoor machine system sends, and judge whether have successful data reception in preset time T 1, if do not have successful data reception, then indoor set system abandons the data that receive and proceeds to resting state; If successful data reception, and the data received and the geocoding of oneself are checked, if not identical with the geocoding of oneself, then indoor set proceeds to resting state; If identical with the geocoding of oneself, indoor set proceeds to the state sending data to off-premises station.So use the method can retain lower construction requirement, compatible before and after realizing, can realize again quantity is not too many one-to-many expansion, and with low cost.
Accompanying drawing explanation
The one-to-many current ring communication method detail flowchart that Fig. 1 provides for the embodiment of the present invention one;
The one-to-many current ring communication hardware circuit schematic diagram that Fig. 2 provides for the embodiment of the present invention one;
Fig. 3 (a) for the embodiment of the present invention one provide with photoelectrical coupler be main formation transmitting element and receiving element;
The electric current loop communication that Fig. 3 (b) embodiment of the present invention one provides is the abstract graph of a pair two.
In figure:
10, outdoor machine system; 20, the first indoor set system; 30, the second indoor set system;
11, off-premises station communication receiving element; 12, off-premises station communication transmitting element; 13, off-premises station control unit; 14, off-premises station memory cell; 15, other input/output interfaces of off-premises station; 16, zero line; 17, communication terminal.
21, indoor set communication receiving element; 22, indoor set communication transmitting element; 23, indoor set memory cell; 24, indoor set control unit; 25, communication electric source; 26, zero line; 27, other input/output interfaces of indoor set; 28, communication terminal.
31, indoor set communication receiving element; 32, indoor set communication transmitting element; 33, indoor set memory cell; 34, indoor set control unit; 35, communication electric source; 36, zero line; 37, other input/output interfaces of indoor set; 38, communication terminal.
Detailed description of the invention
Technical scheme of the present invention is further illustrated below by detailed description of the invention.
The one-to-many current ring communication hardware circuit schematic diagram that Fig. 2 provides for the embodiment of the present invention one.As shown in Figure 2, hardware circuit described in the present embodiment comprises an outdoor machine system 10 and two indoor set systems, is respectively the first indoor set system 20, second indoor set system 30.Described outdoor machine system 10 is connected by bus with the first indoor set system 20, and is connected by bus with the second indoor set system 30.Being parallel relationship between each indoor set system, is series relationship between indoor set system and outdoor machine system, and multiple indoor set system and outdoor machine system form a current-loop communication circuit jointly.Described outdoor machine system 10 can by bus and two mutual communications of indoor set system.Certainly, the quantity of indoor set system is not limited to two, can also more than two.
Outdoor machine system comprises off-premises station communication transmitting element and off-premises station communication receiving element, and each indoor set system includes indoor set communication transmitting element and indoor set communication receiving element.Described outdoor machine system receives the data of each indoor set system transmission respectively by off-premises station communication transmitting element and off-premises station communication receiving element to all indoor set systems transmission data and time-sharing polling; Described each indoor set system sends the data of data and the transmission of reception outdoor machine system respectively by indoor set communication transmitting element and indoor set communication receiving element to outdoor machine system.
Concrete, described outdoor machine system 10 comprises an off-premises station communication receiving element 11, off-premises station communication transmitting element 12, off-premises station control unit 13, off-premises station memory cell 14, other input/output interfaces 15 of off-premises station, zero line 16 and communication terminal 17.The data that described off-premises station communication receiving element 11 sends for receiving each indoor set system; Off-premises station communication transmitting element 12 is for sending data to indoor set system; Off-premises station control unit 13 is cores, software performs at this, for controlling outdoor machine system 10, it connects respectively to off-premises station communication receiving element 11, off-premises station communication transmitting element 12, off-premises station memory cell 14, other input/output interfaces 15 of off-premises station.Off-premises station memory cell 14 is for storing outdoor machine system 10 program code, communication data and various constant used, variable; Other input/output interfaces 15 of off-premises station for realizing other functions of outdoor machine system 10, as information gathering, load control and other communication interface.
The communication terminal 17 of outdoor machine system 10, off-premises station communication receiving element 11, off-premises station communication transmitting element 12 are contacted with zero line 16 phase, wherein off-premises station communication receiving element 11, the requirement of off-premises station communication transmitting element 12 out-of-order.
Described first indoor set system 20 comprises an indoor set communication receiving element 21, indoor set communication transmitting element 22, indoor set control unit 24, indoor set memory cell 23, other input/output interfaces 27 of indoor set, zero line 26, communication electric source 25 and communication terminal 28.The data that described indoor set communication receiving element 21 sends for receiving outdoor machine system 10; Indoor set communication transmitting element 22 is for sending data to outdoor machine system 10; Indoor set control unit 24 is cores, software performs at this, for controlling the first indoor set system 20, it connects respectively to indoor set communication receiving element 21, indoor set communication transmitting element 22, indoor set memory cell 23, other input/output interfaces 27 of indoor set.Indoor set memory cell 23 is for storing the first indoor set system 20 program code, communication data and various constant used, variable; Other input/output interfaces 27 of indoor set for realizing other functions of indoor set system 20, as information gathering, load control and other communication interface.
The zero line 26 of the first indoor set system 20, communication power supply 25, indoor set communication receiving element 21, indoor set communication transmitting element 22, communication terminal 28 phase series winding, wherein indoor set communication receiving element 21, the requirement of indoor set communication transmitting element 22 out-of-order.
Described second indoor set system 30 comprises an indoor set communication receiving element 31, indoor set communication transmitting element 32, indoor set control unit 34, indoor set memory cell 33, other input/output interfaces 37 of indoor set, zero line 36, communication electric source 35 and communication terminal 38.The data that described indoor set communication receiving element 31 sends for receiving outdoor machine system 10; Indoor set communication transmitting element 32 is for sending data to outdoor machine system 10; Indoor set control unit 34 is cores, software performs at this, for controlling the second indoor set system 30, it connects respectively to indoor set communication receiving element 31, indoor set communication transmitting element 32, indoor set memory cell 33, other input/output interfaces 37 of indoor set.; Indoor set memory cell 33 is for storing the second indoor set system 30 program code, communication data and various constant used, variable; Other input/output interfaces 37 of indoor set for realizing other functions of indoor set system 30, as information gathering, load control and other communication interface.
The zero line 36 of the second indoor set system 30, communication power supply 35, indoor set communication receiving element 31, indoor set communication transmitting element 32, communication terminal 38 phase series winding, wherein indoor set communication receiving element 31, the requirement of indoor set communication transmitting element 32 out-of-order.
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 are interconnected, when using common zero line, electric current loop order circuit just can form closed order circuit; The electric current loop order circuit of the first indoor set system and the second indoor set system forms parallel relationship; The electric current loop order circuit of indoor set system and outdoor machine system forms series relationship.Electric current loop communication is directive, and the series and parallel relation therewith sense of current is relevant
In the present embodiment, as shown in Fig. 3 (a), indoor set system and outdoor machine system electric current loop electric current main composition be, the transmitting element being main formation with photoelectrical coupler and receiving element.Realized the Secure isolation of forceful electric power circuit and light current digital circuit by photoelectrical coupler, and realize the detection of communication receiving element and the carrier wave of communication transmitting element with this.During when being in low-voltage safety occasion, without Secure isolation requirement, directly realize detection and carrier wave by triode.
During as transmitting element, the input side connection control unit of optocoupler, the outlet side of optocoupler is series in current loop, can be abstracted into the single knife switch shown in Fig. 3 (b).
During as receiving element, the outlet side connection control unit of optocoupler, the input side of optocoupler is series in current loop, can be abstracted into the light emitting diode shown in Fig. 3 (b).
The large portion of core of existing control system is microelectronics integrated monolithic machine, and be light current digital system circuit, feature is that voltage is low, and operating rate is high; Its peripheral applications system commonly uses strong power system circuit, feature is that voltage is high, low-response, comprises the control output of load and the communication between single-chip microcomputer and single-chip microcomputer, needs to use buffer circuit reliable to ensure safety, conventional photoelectrical coupler, be called for short optocoupler, its principle is input side transform electrical signals Cheng Guang, again changes into the signal of telecommunication at outlet side by light-sensitive element, without being electrically connected between input side with outlet side, excellent insulation performance.
If space length is near between single-chip microcomputer, without the need to Secure isolation, triode can be used to realize mutual communication; The process obtaining signal from communicating circuit is called detection, and process signal being applied to communicating circuit is called carrier wave.
The current ring communication method of a kind of one-to-many of the present invention is, outdoor machine system sends data to all indoor set systems by current-loop communication circuit simultaneously, and specifies the indoor set system of writing in reply; Be designated the indoor set system of writing in reply and send the data to outdoor machine system by current-loop communication circuit; Unappropriated indoor set system enters dormancy and circulates in next communication according to timing requirements simultaneously, independently revives when namely outdoor machine system reenters transmission; The communication between each indoor set and off-premises station is realized by time-sharing polling.
The one-to-many current ring communication method detail flowchart that Fig. 1 provides for the embodiment of the present invention one.As shown in Figure 1, the current ring communication method of one-to-many of the present invention, specifically comprises the following steps,
S10: outdoor machine system 10 sends data by off-premises station communication transmitting element 12 to all indoor set systems, is indoor set system 20, indoor set system 30 in the present embodiment, and specify the indoor set system of writing in reply.
S20: described indoor set system 20, indoor set system 30 all receive the data of outdoor machine system 10 transmission by indoor set communication receiving element 21, indoor set communication receiving element 31, and judge whether have successful data reception in preset time T 1, if success, then perform step S40, otherwise, then step S30 is performed.
S30: the indoor set system of unsuccessful reception abandons the data that receive and proceeds to resting state, and proceeds to step S80.
S40: the indoor set system that success receives judges that whether the data received are identical with the geocoding of oneself, if identical, is namely designated, then perform step S60, otherwise, be not namely designated, perform step S50.
S50: unappropriated indoor set system proceeds to resting state, and proceeds to step S80.
S60: appointed indoor set system proceeds to the state sending data to outdoor machine system 10, and proceeds to step S70.
S70: outdoor machine system 10 proceeds to the state receiving the data that indoor set system sends, and judge whether have successful data reception in preset time T 2, no matter whether successfully receive, then again send data to indoor set system, namely initiate new round communication, come back to step S10.
S80: the indoor set system that successfully can not receive outdoor data, and can successfully receive but unappropriated indoor set system, after entering dormancy overtime T2, independently revive, reenter accepting state, wait for that the communication of outdoor machine system 10 next round transmits, come back to step S20.
In the present embodiment, described indoor set system 20, indoor set system 30 transmit data with described outdoor machine system 10 and realize with the form of current impulse.The process that described indoor set system 20, indoor set system 30 form current impulse with outdoor machine system 10 is:
Changed the equivalent resistance in whole loop by the signal drive current changing self, thus change the size of electric current in electric current loop, and then form current impulse.
In the present embodiment, described all indoor set systems, by geocoding, realize responding with identification during outdoor machine system communication time-sharing polling.The realization of its geocoding can be that hardware is selected, as toggle switch, as input; Also can be the communication process starting stage automatically compete formation, can be have the autonomous autonomous competition detected, and also can be need outdoor machine system to coordinate without autonomous detection, the competition again that constantly reduces the scope of many wheels repeatedly.
As shown in Figure 3 (b), electric current loop communication specific implementation process is as follows:
When transmitting without communication data under normality: the Com-Txd that all control units export is low level, indoor set communication transmitting element 22, indoor set communication transmitting element 32 are closure state, off-premises station communication transmitting element 12 is closure state, and current loop has electric current; Indoor set communication receiving element 21, indoor set communication receiving element 31 are luminous, and off-premises station communication receiving element 11 is luminous, and the Com-Rxd of Input Control Element is high level.
When off-premises station sends data: the Com-Txd that off-premises station control unit 13 exports is high level, and off-premises station communication transmitting element 12 is off state, current loop no current; Off-premises station communication receiving element 11, indoor set communication receiving element 21, indoor set communication receiving element 31 are not luminous, and the Com-Rxd of Input Control Element transfers low level to.So, outdoor machine system 10 sends data successfully can be delivered to indoor set system 20, indoor set system 30, carries out code communication with the pattern of pulse width.
Indoor set enters dormancy: unsuccessful reception and unappropriated indoor set system enter dormancy according to sequential, the Com-Txd that now indoor set control unit exports is high level, high level is always in the process (close to 50% communication cycle) that the indoor set system of non-sleep state sends, its time width is much larger than coded pulse width, and this indoor set system does not provide electric current to current loop; And independently revive at next communication cycle period.
When indoor set sends data: appointed indoor set system is when sending data, it is the indoor set system of unique non-sleep state, the Com-Txd that indoor set control unit exports is high level, and indoor set communication transmitting element is off state, current loop no current; Off-premises station receiving element 11 is not luminous, and the Com-Rxd of Input Control Element transfers low level to.So, appointed indoor set system sends data can successfully be delivered to outdoor machine system 10, carries out code communication with the pattern of pulse width.
For the electric current loop communication system of one-to-many, adopt the mode of time-sharing polling, the communication of outdoor machine system and all indoor set systems can be realized
In the present embodiment, preferably, described indoor set system all by communication Power supply, without the need to additional power source.
In the present invention, described outdoor machine system is functionally in main frame status in Communication Control, and indoor set system is functionally in from machine status in Communication Control.Electric current loop communication system is applied to by expansion master-slave communication controlling functions; Electric current loop host computer communication keep one constant, simultaneously the communication of extend current ring is from machine to multiple.Allly meet electric current loop communication one master and multiple slaves and be all this patent interest field, be not limited to specifically described indoor set or off-premises station; On hardware is formed, Main functional units is also reciprocity.
Below know-why of the present invention is described in conjunction with specific embodiments.These describe just in order to explain principle of the present invention, and can not be interpreted as limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other detailed description of the invention of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (10)
1. a current ring communication method for one-to-many, is characterized in that, outdoor machine system sends data to all indoor set systems by current-loop communication circuit simultaneously, and specifies the indoor set system of writing in reply; Be designated the indoor set system of writing in reply and send the data to outdoor machine system by current-loop communication circuit; Unappropriated indoor set system enters dormancy and circulates in next communication according to timing requirements simultaneously, independently revives when namely outdoor machine system reenters transmission; The communication between each indoor set system and outdoor machine system is realized by time-sharing polling.
2. the current ring communication method of one-to-many according to claim 1, is characterized in that, comprise the following steps,
S10: outdoor machine system sends data to all indoor set systems, and specify the indoor set system of writing in reply;
S20: all indoor set systems all receive the data that outdoor machine system sends, and judge whether have successful data reception in preset time T 1, if success, then performs step S40, otherwise, then perform step S30;
S30: the indoor set system of unsuccessful reception abandons the data that receive and proceeds to resting state, and proceeds to step S80;
S40: the indoor set system that success receives judges that whether the data received are identical with the geocoding of oneself, if identical, is namely designated, then perform step S60, otherwise, be not namely designated, perform step S50;
S50: unappropriated indoor set system proceeds to resting state, and proceeds to step S80;
S60: appointed indoor set system proceeds to the state sending data to outdoor machine system, and proceeds to step S70;
S70: outdoor machine system proceeds to the state receiving the data that indoor set system sends, and judge whether have successful data reception in preset time T 2, no matter whether successfully receive, then again send data to indoor set system, namely initiate new round communication, come back to step S10;
S80: the indoor set system that successfully can not receive outdoor data, and can successfully receive but unappropriated indoor set system, after entering dormancy overtime T2, independently revive, reenter accepting state, wait for that the communication of outdoor machine system next round transmits, come back to step S20.
3. the current ring communication method of one-to-many according to claim 1, it is characterized in that, described outdoor machine system receives the data of each indoor set system transmission respectively by off-premises station communication transmitting element and off-premises station communication receiving element to all indoor set systems transmission data and time-sharing polling; Described each indoor set system sends the data of data and the transmission of reception outdoor machine system respectively by indoor set communication transmitting element and indoor set communication receiving element to outdoor machine system.
4. the current ring communication method of one-to-many according to claim 1, is characterized in that, described all indoor set systems and described outdoor machine system transmit data and realize with the form of current impulse.
5. the current ring communication method of one-to-many according to claim 1, is characterized in that, described indoor set system, by geocoding, realizes responding with identification during outdoor machine system communication time-sharing polling.
6. the current ring communication method of one-to-many according to claim 3, it is characterized in that, described outdoor machine system and indoor set system, realized the Secure isolation of forceful electric power circuit and light current digital circuit by photoelectrical coupler, and realize the detection of communication receiving element and the carrier wave of communication transmitting element with this; Or directly realize detection and carrier wave by triode.
7. the current ring communication method of one-to-many according to claim 4, is characterized in that, the process that described indoor set system and outdoor machine system form current impulse is:
Changed the equivalent resistance in whole loop by the signal drive current changing self, thus change the size of electric current in electric current loop, and then form current impulse.
8. the current loop communication device of an one-to-many, it is characterized in that, comprise outdoor machine system, two or more indoor set system, connected by communication line between described outdoor machine system and described each indoor set system, parallel relationship between each indoor set system, be series relationship between indoor set system and outdoor machine system, multiple indoor set system and outdoor machine system form a current-loop communication circuit jointly.
9. the current loop communication device of one-to-many according to claim 8, is characterized in that,
Described indoor set system comprises:
Indoor set communicating circuit, its transmission for data and reception;
Other input/output interfaces of indoor set, it comprises information gathering, load controls and other communication interfaces;
Indoor set memory cell, it is for storing the data of indoor set system; And
As the indoor set control unit of core, it is for controlling corresponding indoor set system, and software-implemented logic controls;
Described outdoor machine system comprises:
Off-premises station communicating circuit, its transmission for data and reception;
Other input/output interfaces of off-premises station, other parts of outdoor machine system, comprise information gathering, load control and other communication interfaces;
Off-premises station memory cell, it is for storing the data of outdoor machine system; And
As the off-premises station control unit of core, it is for controlling outdoor machine system, and software-implemented logic controls.
10. the current loop communication device of one-to-many according to claim 9, is characterized in that,
Described indoor set communicating circuit comprises with lower part:
Indoor set communication transmitting element, it is for sending data to outdoor machine system;
Indoor set communication receiving element, its data sent for receiving outdoor machine system;
Described off-premises station communicating circuit comprises with lower part:
Off-premises station communication transmitting element, it is for sending data to all indoor set systems;
Off-premises station communication receiving element, its data sent for receiving each indoor set system.
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| CN111256219A (en) * | 2020-02-13 | 2020-06-09 | 海信（山东）空调有限公司 | Multi-split air conditioner |
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| CN114076401A (en) * | 2021-10-09 | 2022-02-22 | 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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| CN114076401A (en) * | 2021-10-09 | 2022-02-22 | 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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