CN106453019A - Communication method of multiple online internal and external machines - Google Patents

Abstract

The invention discloses a multi-line internal and external machine communication method, which includes an external machine and several internal machines. The internal and external machine communication method includes the following steps: (1), dividing the data in the internal machine into levels (2), according to The level of the level determines the transmission frequency of each level; (3), the internal unit sends all the data in one level in each round of communication, and the number of communication rounds of each level in a communication cycle is determined according to the transmission frequency. The level of the level determines the communication sequence of each level within a communication cycle; (4), after the external unit sends an inquiry message, the internal unit follows the communication sequence of each level determined in step (3) and the communication of each level within a communication cycle The round polling is sent to the external unit for reply. The multi-line internal and external machine communication method of the present invention has a more flexible communication mode, can greatly improve the system response speed and improve the communication anti-interference ability.

Description

A communication method for multi-line internal and external machines

technical field

The invention relates to the technical field of air conditioner communication, in particular to a communication method for multi-connected internal and external units.

Background technique

In a multi-connected system, the outdoor unit is usually connected to multiple indoor units, and each indoor unit includes parameters such as status, temperature, humidity, various sensors, and valves that need to be transmitted during the communication process. In a round of communication, the external unit is the main device, after sending its own data or instructions to the communication bus, each internal unit sends its own data to the communication bus in turn, and the external unit performs detection and reception. For example, if the system is connected to 10 indoor units, the communication process of a round of internal and external units is: external unit—inner unit 1—inner unit 2—inner unit 3—inner unit 4—inner unit 5—inner unit 6—inner unit 7—inner Machine 8—inner machine 9—inner machine 10.

Due to the large number of internal units, the round communication time of internal and external units will be relatively long. Therefore, how to improve the communication speed of internal and external units has become the focus of research and development. The usual method is to improve hardware performance, speed up data transmission, and speed up system response. The disadvantage of this method is that on the one hand, improving hardware will increase costs, and on the other hand, affected by the surrounding environment, the faster the speed, the easier it is to be affected by various interference, resulting in data transmission errors.

Contents of the invention

In order to solve the problem that the existing internal and external machines have a long round of communication time, and the problem of increasing the cost and increasing the error rate of data transmission caused by improving the hardware performance, the present invention proposes a multi-line internal and external machine communication method, which can solve the above problems .

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to achieve:

A multi-line internal and external machine communication method, including an external machine and several internal machines, the internal and external machine communication method includes the following steps:

(1) Divide the data in the internal unit into levels, each level includes one type or multiple types of data;

(2) Taking the internal machine data at the same level as the unit, determine the sending frequency of each level according to the level of the level;

(3) The internal unit sends all the data in one level in each round of communication, the number of communication rounds of each level in a communication cycle is determined according to the transmission frequency, and the communication of each level in a communication cycle is determined according to the level of the level In order, the communication period is the time it takes for all levels of internal machine data to complete at least one round of communication;

(4) After the external unit sends an inquiry message, the internal unit polls and sends it to the external unit according to the communication sequence of each level determined in step (3) and the number of communication rounds of each level within a communication cycle, and responds.

Further, at the beginning of any round of communication in step (4), the internal unit first judges the level of the data to be sent in the current communication, finds out all the data in the level of the data to be sent in the current communication as the data to be sent, and then all The internal unit sends the data to be sent in the internal unit to the external unit in sequence.

Further, in the round of communication in step (4), the internal unit also includes the step of comparing the data to be sent by the internal unit in the current round of communication with the data sent by the internal unit in the previous round of communication corresponding to the current level , if the two are inconsistent, the complete data frame will be sent normally, otherwise, the data to be sent by the internal unit of the current round of communication will be compressed and sent.

Further, in the round of communication in step (4), the method of compressing the data to be sent is: generating a feature code from the data to be sent, and sending the feature code to the external machine.

Further, the feature code is calculated by the internal machine using a calculation formula. After the external machine receives the feature code, it uses the same calculation formula to calculate the complete data of the internal machine in the previous round of communication corresponding to the current level. First feature code, and compare the first feature code with the feature code, if they are consistent, confirm that the data of the internal machine in this round of communication has not changed, otherwise the external machine will notify the internal machine that sent the feature code, and the corresponding internal machine at the current level A complete data frame needs to be sent in the next round of communication.

Further, in step (1), the basis for classifying the data in the internal unit is the level of real-time data requirements of the external unit. The higher the real-time requirement, the higher the corresponding level, and the higher the communication sequence of this level.

Compared with the prior art, the advantages and positive effects of the present invention are: the multi-line internal and external unit communication method of the present invention, by classifying the communication data, each round of polling only sends the data of all internal units within the same level. Data, the amount of data is reduced, the communication time of each round of communication is shortened, and because the amount of data in each round of communication is reduced, even if the data of this round is disturbed, at most the data of this round of communication will be discarded, and other data will not be affected, which can effectively Avoid the problem of transmitting all the communication data of the internal machine in one round of communication in the prior art. Due to the large amount of transmitted data, it is necessary to discard all the data due to an error in one place. This communication method is more flexible, which can greatly improve the system response speed and improve In addition, by dividing the levels and assigning communication frequencies to each level, the order of data communication and the division of communication frequencies can be made according to the actual requirements of communication, making communication more direct and efficient.

Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a flow chart of an embodiment of the multi-line internal and external machine communication method proposed by the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment 1. This embodiment proposes a multi-connection internal and external machine communication method, including an external machine and several internal machines. As shown in FIG. 1, the internal and external machine communication method includes the following steps:

S1. Divide the data in the internal unit into levels, each level includes one type or multiple types of data;

S2. Using the internal unit data at the same level as a unit, determine the sending frequency of each level according to the level of the level;

S3. The internal machine sends all data in one level in each round of communication, determines the number of communication rounds of each level in a communication cycle according to the sending frequency, and determines the communication sequence of each level in a communication cycle according to the level of the level, The communication cycle is the time taken for all levels of internal machine data to complete at least one round of communication;

S4. After the external unit sends an inquiry message, the internal unit polls and sends it to the external unit according to the communication order of each level determined in step 3 and the number of communication rounds of each level within one communication cycle, and responds.

For example, the data of each indoor unit can be divided into three types: operating status, sensors, and configuration parameters. The operating status has the highest real-time requirements, such as the operating mode of the air conditioner (cooling or heating), wind speed, set temperature, etc. These data are often controlled by the controller and directly displayed to the user. The second is sensors, including temperature, humidity sensors, expansion valves, etc. These data change relatively slowly and are mainly used to monitor the operating status of the system. The configuration parameters are usually some fixed data after leaving the factory or on-site debugging, such as the number of horses of capacity, the type of internal machine, etc.

If there are a total of 60 internal machine parameters, including 20 operating states, 30 sensors, and 10 configuration parameters, the amount of data per frame is significantly reduced after being divided by type, which improves the anti-interference ability of communication.

In the communication method of multi-connected internal and external units in this embodiment, by classifying the communication data, only the data of all internal units located in the same level are sent in each round of polling, the amount of data is reduced, and the communication time of each round of communication is shortened. Due to the reduction of the amount of data in each round of communication, even if the current round of data is disturbed, at most the data of this round of communication will be discarded without affecting other data, which can effectively avoid all the communication of the internal machine in a round of communication in the prior art Data, due to the large amount of transmitted data, it is necessary to discard all the data due to an error in one place. This communication method is more flexible and can greatly improve the system response speed. In addition, by dividing levels and assigning communication frequencies to each level, you can According to the actual requirements of communication, the order of communication and the frequency of communication are divided to make communication more direct and efficient.

At the beginning of any round of communication in step S4, the internal unit first judges the level of the data to be sent in the current communication, finds out all the data in the level of the data to be sent in the current communication as the data to be sent, and then all the internal units sequentially send The data to be sent in the internal unit is sent to the external unit.

After the outdoor unit sends an inquiry, the internal unit responds by data type and time division. High-level data has high real-time performance and increases the response frequency, while low-level data reduces the response frequency. Taking the system with 10 internal units as an example, the communication process is similar to the following process:

Outdoor unit—indoor unit 1 status—indoor unit 2 status…—indoor unit 10 status (first round)

Outer unit—inner unit 1 status—inner unit 2 status…—inner unit 10 status (second round)

…

Outer unit—inner unit 1 status—inner unit 2 status…—inner unit 10 status (round i)

Outer unit—inner unit 1 sensor—inner unit 2 sensor…—inner unit 10 sensor (round i+1)

Outer unit—inner unit 1 status—inner unit 2 status…—inner unit 10 status (round i+2)

…

Outer unit—inner unit 1 state—inner unit 2 status $sensor…—inner unit 10 sensor (round j+1)

Outer unit—inner unit 1 status—inner unit 2 status…—inner unit 10 status (round j+2)

…

Outer unit—inner unit 1 status—inner unit 2 status…—inner unit 10 status (round k)

External unit—inner unit 1 configuration parameters—inner unit 2 configuration parameters…—inner unit 10 configuration parameters (round k+1)

Outer unit—inner unit 1 status—inner unit 2 status…—inner unit 10 status (round k+2)

…

If the round time of the internal and external machine communication is 5 seconds, the internal machine responds to sensor data every 1 minute, the internal machine responds to configuration parameters every 5 minutes, and responds to operating status data at other times. In this way, a total of 10*60÷5=120 rounds of communication between the internal and external units have been carried out in 10 minutes. Among them, the internal unit sends sensor data 10 times, sends configuration parameters 2 times, and sends operating status data a total of 120-10-2=108 times, which is obvious. Improve the transmission of running status data and speed up the response speed of the system.

In order to further reduce the amount of data transmitted in each round of communication, in the round of communication in step S4, the internal unit also includes the data to be sent by the internal unit in the current round of communication and the internal unit in the previous round of communication corresponding to the current level. The step of comparing the sent data, if the two are not consistent, send the complete data frame normally, otherwise, compress and send the data to be sent by the internal unit of the current round of communication. Taking the running state of the internal unit as an example, if a round of communication between the internal and external units, the internal unit first sends normally, and in the next round of communication, if all the state parameters of the internal unit are consistent with those sent to the external unit last time, the compressed transmission will be performed. , if the operation mode changes at a certain moment, such as from cooling to heating, the operation status data needs to be sent in a complete package. In the next round of communication, if it remains consistent, it will be compressed and sent again.

The so-called compressed transmission refers to reducing the amount of data as much as possible, and one data can represent multiple data. Using 1 or 2 bytes of special flags can represent the multiple data N bytes of the last time, and represent enough information with the least bytes.

In the round of communication in step S4, the method of compressing the data to be sent is: generating a feature code from the data to be sent, and sending the feature code to the external machine.

When compressing and sending, only special flag characters are indicated in the data frame, and status data is not sent. When the outdoor unit receives this special flag character, it can judge that the status data of the inner unit has not changed, and still store the original status of the inner unit. Therefore, if in a round of communication, the data to be sent by the internal unit does not change from the data sent in the previous round, and is consistent with the data sent to the external unit before, then there is no need to send all the parameters to the external unit. , but send a special flag to indicate to the external unit that the data has not changed, and the external unit continues to use the previous data of the internal unit, so that a lot of data can be sent less, so the system response speed can be further improved.

In order to ensure the correct judgment of the internal unit and prevent communication errors, the external unit needs to further confirm the conclusion made by the internal unit that the data has not changed, so as to improve the quality of data communication. The feature code is calculated by the internal unit using a calculation formula. After arriving at the feature code, use the same calculation formula to calculate the first feature code for the complete data of the internal machine in the previous round of communication corresponding to the current level, and compare the first feature code with the feature code, if Consistent, confirm that the data of the internal unit in this round of communication has not changed, otherwise the external unit will notify the internal unit that sent the feature code that a complete data frame needs to be sent in the next round of communication corresponding to the current level.

There may be one or more faulty internal units at the same time. When the external unit notifies the faulty internal units, it can notify all the internal units by broadcast, or notify one or some faulty internal units by unicast. Send normal data frame once.

In step S1, the basis for classifying the data in the internal unit is that the external unit has high or low real-time requirements for data. The higher the real-time requirement, the higher the corresponding level, and the higher the communication sequence of this level.

The communication method does not involve the improvement of the hardware, so it can solve all the disadvantages and deficiencies brought about by improving the hardware to solve the communication speed at present.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention shall also belong to protection scope of the present invention.

Claims (6)

1. A multi-line internal and external machine communication method, is characterized in that, comprises an external machine and several internal machines, and described internal and external machine communication method comprises the following steps: (1) Divide the data in the internal unit into levels, each level includes one type or multiple types of data; (2) Taking the internal machine data at the same level as the unit, determine the sending frequency of each level according to the level of the level; (3) The internal unit sends all the data in one level in each round of communication, the number of communication rounds of each level in a communication cycle is determined according to the transmission frequency, and the communication of each level in a communication cycle is determined according to the level of the level In order, the communication period is the time it takes for all levels of internal machine data to complete at least one round of communication; (4) After the external unit sends an inquiry message, the internal unit polls and sends it to the external unit according to the communication sequence of each level determined in step (3) and the number of communication rounds of each level within a communication cycle, and responds. 2. The communication method of multi-line internal and external units according to claim 1, characterized in that, at the beginning of any round of communication in step (4), the internal unit first judges the level of the data to be sent in the current communication, and finds out the All the data in the level of the data to be sent in the communication is used as the data to be sent, and then all the internal units send the data to be sent in the internal unit to the external unit in order. 3. The multi-connection internal and external unit communication method according to claim 2, characterized in that, in the round of communication in step (4), the internal unit further includes the data to be sent by the internal unit for this round of communication and the current level. Corresponding to the step of comparing the data sent by the internal unit in the previous round of communication, if the two are inconsistent, send the complete data frame normally, otherwise, compress and send the data to be sent by the internal unit in the current round of communication. 4. The multi-connection internal and external machine communication method according to claim 3, characterized in that, in the round of communication in step (4), the method of compressing the data to be sent is: generating a characteristic of the data to be sent code, and send the code to the external unit. 5. The multi-connection internal and external machine communication method according to claim 4, characterized in that, the feature code is calculated by the internal machine using a calculation formula, and after the external machine receives the feature code, it performs an operation on the previous level corresponding to the current level. For the complete data of the internal machine in a round of communication, use the same calculation formula to calculate the first feature code, and compare the first feature code with the said feature code, if they are consistent, confirm that the data of the internal machine in this round of communication has not changed , otherwise the external machine notifies the internal machine sending the feature code that a complete data frame needs to be sent in the next round of communication corresponding to the current level. 6. The multi-connection internal and external machine communication method according to any one of claims 1-5, characterized in that the basis for classifying the data in the internal machine in step (1) is the level of real-time data requirements of the external machine, The higher the real-time requirement, the higher the corresponding level, and the higher the communication sequence of this level.