CN113294887A - Competitive RS485 communication method and device and air conditioning system - Google Patents
Competitive RS485 communication method and device and air conditioning system Download PDFInfo
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- CN113294887A CN113294887A CN202110494604.6A CN202110494604A CN113294887A CN 113294887 A CN113294887 A CN 113294887A CN 202110494604 A CN202110494604 A CN 202110494604A CN 113294887 A CN113294887 A CN 113294887A
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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
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- 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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Selective Calling Equipment (AREA)
Abstract
The invention provides a competitive RS485 communication method, a device and an air conditioning system, wherein the method comprises the following steps: if the equipment is resident equipment, the signaling time sequence condition of the resident equipment is that the bus is idle for a first time length; if the equipment is general equipment, the signal sending time sequence condition of the general equipment is that the bus is idle for a second time length; the second duration is less than the first duration. The idle time length of the general equipment needing to wait is less than that of resident equipment needing to wait, so that the competitive communication of multiple equipment is realized, the flexibility of the equipment for joining the communication can be improved, and the communication efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of air conditioner communication, in particular to a competitive RS485 communication method, a competitive RS485 communication device and an air conditioner system.
Background
The RS485 communication bus is a communication bus widely applied in the industrial field at present, and has the advantages of mature technology, simple realization, low cost, interference resistance and the like. The RS485 communication bus is applied to various scenes, for example, a central air conditioner adopts the RS485 communication bus as a communication mode among a plurality of devices.
However, due to technical characteristics limitations, RS485 is not comparable to other advanced communication buses in application. For example, the CAN bus adopts a masterless structure, an automatic arbitration competition mechanism based on communication does not need to consider the problem of communication time sequence too much, and the simultaneous transmission among a plurality of devices does not cause bus communication 'car jam', and has the characteristics of high efficiency, simple application and the like. And RS485 adopts a master-slave structure bus form, so that the problems of low communication efficiency and poor flexibility of equipment addition exist.
Disclosure of Invention
The invention solves the problems of low communication efficiency and poor flexibility of equipment addition in the conventional RS485 communication implementation mode.
In order to solve the above problem, the present invention provides a contention-based RS485 communication method, which is applied to a device connected to an RS485 communication bus, and includes: if the equipment is resident equipment, the signaling time sequence condition of the resident equipment is a first time length of bus idle; if the equipment is general equipment, the signaling time sequence condition of the general equipment is that the bus is idle for a second time length; the second duration is less than the first duration.
The resident equipment and the general equipment have a bus idle detection mechanism, the sending time can be automatically adjusted according to the bus state, and the idle time length of the general equipment needing to wait is less than that of the resident equipment, so that the competitive communication of multiple equipment is realized, the flexibility of the equipment for joining the communication is improved, and the communication efficiency is improved.
Optionally, the method further comprises: and when a new device is accessed to the RS485 communication bus, setting the device type of the new device as a common device.
The invention sets the new device as a common device when the new device is added, thereby obtaining the bus transmission priority without redesigning and adjusting the bus transmission time sequence, and the device has flexible access and good compatibility.
Optionally, the method further comprises: when the general equipment has a signaling requirement, detecting the idle time of a bus; and if the bus idle time reaches the second time, executing a signaling operation.
The invention can realize the instant transmission demand of the general device by the prior transmission when the idle time of the bus reaches the second time, so that the commands of control, inquiry and the like can be quickly transmitted and responded.
Optionally, the method further comprises: when the resident equipment has a signaling requirement, detecting the idle time of a bus after the signaling of the general equipment is finished; and if the bus idle time length reaches the first time length after the general equipment finishes transmitting the signal, executing the signal transmitting operation.
The resident equipment needs to wait for the idle time of the bus and then send the signal after reaching the first time after being preempted by the common equipment to send the signal, thereby realizing competitive communication and improving the communication efficiency.
Optionally, the method further comprises: and if the resident equipment is slave equipment, determining that the signaling requirement exists after receiving the query information of the master equipment.
In the invention, the slave equipment can send the message only when receiving the message sent by the master equipment, thereby realizing the data interaction between the master equipment and the slave equipment.
Optionally, the resident device comprises at least one of: indoor set of air conditioner, air condensing units, general equipment includes following at least one: centralized controller, gateway, drive-by-wire ware.
The invention defines common types of resident equipment and general equipment for the air conditioning system, and can realize competitive communication of each equipment based on an RS485 bus.
The invention provides a competitive RS485 communication device, which is applied to equipment connected to an RS485 communication bus and comprises: the first sending module is used for sending a first time length to the resident equipment if the equipment is the resident equipment; the second transmitting module is used for enabling the transmitting time sequence condition of the general equipment to be the second idle time length of the bus if the equipment is the general equipment; the second duration is less than the first duration.
Optionally, the apparatus further comprises an access module configured to: and when a new device is accessed to the RS485 communication bus, setting the device type of the new device as a common device.
The invention provides an air conditioning system which comprises a plurality of air conditioning devices, wherein the air conditioning devices are communicated by adopting the method.
The invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the competitive RS485 communication method is realized.
The competitive RS485 communication device and the computer readable storage medium can achieve the same technical effect as the competitive RS485 communication method.
Drawings
Fig. 1 is a schematic diagram of a contention-based RS485 communication network according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a contention-based RS485 communication method according to an embodiment of the present invention;
FIG. 3 is a timing diagram of a conventional RS485 communication;
FIG. 4 is a timing diagram of RS485 communication in accordance with an embodiment of the invention;
fig. 5 is a schematic structural diagram of a contention-based RS485 communication device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a competitive RS485 communication method, which can be applied to equipment connected to an RS485 communication bus, wherein the equipment can be resident equipment or general equipment.
The resident device is a device which must transmit a signal on the bus after the bus is established, and the master device must be a resident device (hereinafter referred to as a type a device); a general device (hereinafter referred to as a type B device) refers to a listening device or a controlling device that needs access later. For example, a type a device may include: indoor air conditioners, outdoor air conditioners and the like, and the type B devices may include: centralized controller, gateway, drive-by-wire ware etc.. Specifically, the type a devices may be classified into a type a master device and a type a slave device.
Referring to fig. 1, a schematic diagram of a contention-based RS485 communication network is shown, in which a resident master device, a plurality of resident slave devices and a plurality of general devices are all connected to an RS485 communication bus.
If the equipment is type A equipment, the signal sending time sequence condition is that the bus is idle for a first time length; if the equipment is B-type equipment, the signal sending time sequence condition is that the bus is idle for a second time length; the second duration is less than the first duration.
Specifically, if the bus is the type A master device, the overall time sequence of the bus needs to be controlled according to the RS485 requirement, and communication is initiated by the bus; the idle time of the bus needs to be detected in real time before sending the signal, and the idle t of the bus needs to be met before sending the signal each time1The duration is not enough to disallow the sending; if the type A slave equipment is the type A slave equipment, the transmission can be carried out only when the transmission of the master equipment is received; the idle time of the bus needs to be detected in real time before sending the signal, and the idle t of the bus needs to be met before sending the signal each time1The duration is not enough to disallow the sending; if the type B equipment is the equipment, the equipment has no state attribute, namely the equipment does not need to send the equipment state, and the data of the state attribute is sent to the bus requirement; the normal state is a receiving monitoring state, and only the signal is sent when the requirements such as control, inquiry and the like are met. Detecting the idle time of the bus before sending signal, wherein the idle time of the bus satisfies t2Duration can send data, and t2<t1。
According to the competitive RS485 communication method provided by the embodiment of the invention, the resident equipment and the general equipment are provided with the bus idle detection mechanism, the sending time can be automatically adjusted according to the bus state, and the idle time length of the general equipment needing to wait is less than that of the resident equipment, so that the competitive communication of multiple equipment is realized, the flexibility of the equipment for joining the communication is improved, and the communication efficiency is improved.
By pre-setting the device type for each device, the B-type device can preempt the bus signaling priority. When the new device is connected to the RS485 communication bus, the device type of the new device can be set as a general device. By setting the device type of the new device as a common device, the new device can be freely accessed without redesigning and adjusting the bus transmission permission, and the control efficiency and the compatibility are high.
Referring to the flow chart of the competitive RS485 communication method shown in fig. 2, the method includes the following steps:
and S202, the type A master device sends a signal.
The RS485 bus A type master device carries out master-slave communication according to an RS485 protocol, detects the bus state in real time, and meets the bus idle t before transmitting each time1A duration; i.e. the communication interval between a type a device and any previous device is t1The length of time.
And S204, receiving the type A slave equipment.
S206, judging whether the bus idle time length is more than t2. If yes, go to step S208; if not, S206 is repeatedly executed.
After the type B equipment is accessed to the RS485 communication bus, if the type B equipment has a transmission requirement, the idle time of the bus is detected; and if the bus idle time reaches the second time, executing the signaling operation. The B-type equipment also detects the bus state in real time after being accessed into the RS485 bus, and when a signal transmission requirement exists, the idle time t of the bus needs to be met2And t is2<t1(ii) a I.e. the communication interval between a type B device and any previous device is t2The length of time.
And S208, the type B device sends a signal.
S210, judging whether the bus idle time length is greater than t1. If yes, go to step S212; if not, go to S206.
When the type A equipment has a transmission requirement, detecting the idle time of a bus after the type B equipment finishes transmitting; and if the idle time of the bus reaches the first time after the type B equipment finishes transmitting the signal, executing the signal transmitting operation. Type A device receives the number of other type A devicesThereafter, wait for t1In the duration process, the device of type B is at t2Seizing and sending data at any moment, and restarting the counting of t by the type A equipment after the type B equipment sends the signal1The length of time.
And S212, the type A device sends a signal.
And if the type A equipment is the slave equipment, determining that the signaling requirement exists after receiving the query information of the type A master equipment.
According to the method, the type B device has higher priority relative to the type A device, so that the instant messaging requirement of the type B device is realized, and commands such as control, inquiry and the like can be rapidly sent and responded.
Referring to the conventional RS485 communication timing diagram shown in fig. 3, after the type a master device finishes transmitting the signal, the idle time of the bus reaches t1The type a slave signals. The interval between the respective transmission timings is greater than t1。
Referring to the RS485 communication timing diagram shown in fig. 4, after the type a master device finishes transmitting the signal, the idle time of the bus reaches t2Sending by the B-type equipment, and when the B-type equipment finishes sending and the bus idle time reaches t1The type a slave signals. The communication interval between the type B device and any previous device is t2Duration, communication interval between type A device and any previous device being t1The length of time.
The invention designs a novel RS485 bus communication method, which can realize competitive communication of multiple devices after certain conditions are met; the resident equipment is provided with a bus idle detection mechanism and can automatically adjust the sending time according to the bus state; the new equipment on the bus can be freely accessed, the bus transmission time sequence does not need to be redesigned and adjusted, the control efficiency is high, and the compatibility is good.
Fig. 5 is a schematic structural diagram of a contention-based RS485 communication device according to an embodiment of the present invention, where the contention-based RS485 communication device is applied to a device connected to an RS485 communication bus, and includes:
a first signaling module 501, configured to, if the device is a resident device, set a signaling timing condition of the resident device as a first bus idle duration;
a second signaling module 502, configured to, if the device is a general device, signal a timing condition of the general device is a second bus idle duration;
the second duration is less than the first duration.
Optionally, the apparatus further comprises an access module configured to: and when a new device is accessed to the RS485 communication bus, setting the device type of the new device as a common device.
Optionally, the second signaling module 502 is further configured to: when the general equipment has a signaling requirement, detecting the idle time of a bus; and if the bus idle time reaches the second time, executing a signaling operation.
Optionally, the first sending module 501 is further configured to: when the resident equipment has a signaling requirement, detecting the idle time of a bus after the signaling of the general equipment is finished; and if the bus idle time length reaches the first time length after the general equipment finishes transmitting the signal, executing the signal transmitting operation.
Optionally, the first sending module 501 is further configured to: and if the resident equipment is slave equipment, determining that the signaling requirement exists after receiving the query information of the master equipment.
Optionally, the resident device comprises at least one of: indoor set of air conditioner, air condensing units, general equipment includes following at least one: centralized controller, gateway, drive-by-wire ware.
The embodiment of the invention also provides an air conditioning system which comprises a plurality of air conditioning devices, and the air conditioning devices are communicated by adopting the competitive RS485 communication method.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method provided in the foregoing embodiment is implemented, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the competitive RS485 communication device and the air conditioning system disclosed in the embodiments, since they correspond to the competitive RS485 communication method disclosed in the above embodiments, the description is relatively simple, and the relevant points can be referred to the description of the method part.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A contention-based RS485 communication method, applied to a device connected to an RS485 communication bus, includes:
if the equipment is resident equipment, the signaling time sequence condition of the resident equipment is a first time length of bus idle;
if the equipment is general equipment, the signaling time sequence condition of the general equipment is that the bus is idle for a second time length;
the second duration is less than the first duration.
2. The method of claim 1, wherein the method further comprises:
and when a new device is accessed to the RS485 communication bus, setting the device type of the new device as a common device.
3. The method of claim 1, wherein the method further comprises:
when the general equipment has a signaling requirement, detecting the idle time of a bus;
and if the bus idle time reaches the second time, executing a signaling operation.
4. The method of claim 3, wherein the method further comprises:
when the resident equipment has a signaling requirement, detecting the idle time of a bus after the signaling of the general equipment is finished;
and if the bus idle time length reaches the first time length after the general equipment finishes transmitting the signal, executing the signal transmitting operation.
5. The method of claim 4, wherein the method further comprises:
and if the resident equipment is slave equipment, determining that the signaling requirement exists after receiving the query information of the master equipment.
6. The method of claim 1, wherein the resident device comprises at least one of: indoor set of air conditioner, air condensing units, general equipment includes following at least one: centralized controller, gateway, drive-by-wire ware.
7. A contention-type RS485 communication apparatus, for use with a device connected to an RS485 communication bus, the apparatus comprising:
the first sending module is used for sending a first time length to the resident equipment if the equipment is the resident equipment;
the second transmitting module is used for enabling the transmitting time sequence condition of the general equipment to be the second idle time length of the bus if the equipment is the general equipment;
the second duration is less than the first duration.
8. The apparatus of claim 7, wherein the apparatus further comprises an access module to: and when a new device is accessed to the RS485 communication bus, setting the device type of the new device as a common device.
9. An air conditioning system comprising a plurality of air conditioning units, each communicating between the air conditioning units using the method of any one of claims 1 to 6.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110494604.6A CN113294887A (en) | 2021-05-07 | 2021-05-07 | Competitive RS485 communication method and device and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110494604.6A CN113294887A (en) | 2021-05-07 | 2021-05-07 | Competitive RS485 communication method and device and air conditioning system |
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| CN202110494604.6A Withdrawn CN113294887A (en) | 2021-05-07 | 2021-05-07 | Competitive RS485 communication method and device and air conditioning system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9119186D0 (en) * | 1991-09-07 | 1991-10-23 | Motorola Israel Ltd | Communications apparatus |
| CN103036754A (en) * | 2012-11-22 | 2013-04-10 | 青岛海尔空调电子有限公司 | Communication system and communication method of multi-online air-conditioner |
| CN108365944A (en) * | 2018-03-06 | 2018-08-03 | 山东比特智能科技股份有限公司 | A kind of communication means of half-duplex bus, system and room control system |
| CN109547945A (en) * | 2017-09-22 | 2019-03-29 | 珠海市魅族科技有限公司 | Communication means, device, access point apparatus and the site apparatus of WLAN |
| CN112491675A (en) * | 2020-10-26 | 2021-03-12 | 创泽智能机器人集团股份有限公司 | Data communication method, device, equipment and computer readable storage medium |
-
2021
- 2021-05-07 CN CN202110494604.6A patent/CN113294887A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9119186D0 (en) * | 1991-09-07 | 1991-10-23 | Motorola Israel Ltd | Communications apparatus |
| CN103036754A (en) * | 2012-11-22 | 2013-04-10 | 青岛海尔空调电子有限公司 | Communication system and communication method of multi-online air-conditioner |
| CN109547945A (en) * | 2017-09-22 | 2019-03-29 | 珠海市魅族科技有限公司 | Communication means, device, access point apparatus and the site apparatus of WLAN |
| CN108365944A (en) * | 2018-03-06 | 2018-08-03 | 山东比特智能科技股份有限公司 | A kind of communication means of half-duplex bus, system and room control system |
| CN112491675A (en) * | 2020-10-26 | 2021-03-12 | 创泽智能机器人集团股份有限公司 | Data communication method, device, equipment and computer readable storage medium |
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