CN107864141A - TCP/IP network communication methods based on LabVIEW - Google Patents

Abstract

The invention provides a TCP/IP network communication method based on LabVIEW. By establishing a data buffer mechanism at the server end, the server end continuously updates the last frame of data through a mobile register with a circular structure. Once an error flag occurs in the communication connection, the server end Send the latest updated data of the shift register with a circular structure to the client. This setting method can effectively avoid frame loss; by establishing an ID screening and fault tolerance mechanism, the invalid connection IDs generated by communication errors between the server and the client are screened and processed. Close, so that the server will no longer continue to perform write or read actions on the client that has a communication error, which will greatly reduce the burden on the server-side processor; by establishing a cyclic reconnection mechanism, the client will create a new Even if the network connection is disconnected or unstable and the current communication connection fails, the client will create a new connection in the next cycle, so that the network connection can be restored quickly.

Description

TCP/IP Network Communication Method Based on LabVIEW

technical field

The invention belongs to the technical field of network communication, and in particular relates to a TCP/IP network communication method based on LabVIEW active reconnection.

Background technique

Network communication is to connect isolated devices through the network, and to realize communication between people, people and computers, and computers and computers through information exchange. The most important thing in network communication is the network communication protocol. There are many existing network protocols, and three are most commonly used in LAN: NETBEUI of MICROSOFT, IPX/SPX and TCP/IP protocols of NOVELL, among them, only TCP/IP allows full connection with the Internet. TCP/IP has both scalability and reliability requirements. The TCP/IP communication protocol is the most basic protocol of the Internet, and it is also the foundation of the Internet.

As a communication-oriented data protocol, TCP provides reliable data transmission between two computers. TCP can ensure that when data is sent from one system network to another system network, the data can be delivered accurately and safely, so it is suitable for reliable occasions with high sexual requirements. In the working mode, it adopts reliable duplex byte stream, stream byte stream interface and other methods. TCP will establish a virtual channel between two network communication channels, and construct a bidirectional byte stream information processing method through this way of connecting channels.

Traditional network communication debugging uses high-level languages, such as VC, VB, C#, Java, etc. The program codes of these languages are lengthy and inconvenient for function expansion. If the network communication data is analyzed, it is necessary to overturn the original program structure and reprogram the code .

Compared with traditional programming languages, LabVIEW uses graphics (that is, various icons, graphic symbols, connections, etc.) for programming, which has the characteristics of simple programming, strong intuitiveness, friendly human-computer interaction interface, data visualization analysis and excellent equipment control capabilities. The existing TCP/IP network communication based on LabVIEW programming has the following problems: one, when the server end of a general TCP/IP network communication system utilizes a loop structure to continuously write data, the client sometimes cannot read or read empty data; Second, when using LabVIEW for single-server-to-multi-client communication, once an error occurs in the communication between one or several clients and the server, an invalid connection ID will be generated, but the server will still continue to communicate with the client where the communication error occurred. Perform write or read actions, and these write or read actions are invalid communication actions. These actions will increase the server-side processor and resource usage. If there are many server-side program threads, the system will not run smoothly. , making the system run slowly; third, due to the instability of the network itself, it is more susceptible to external interference, resulting in disconnection or instability of the network connection, and the connection cannot be quickly and automatically restored.

Contents of the invention

In view of this, the present invention aims to propose a TCP/IP network communication method based on LabVIEW, to solve the invalid communication action generated when the client reads errors and errors occur in the existing TCP/IP network communication and network reconnection issues.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A kind of TCP/IP network communication method based on LabVIEW, comprises the steps:

S1: Set up the hardware system, including server-side computer, crossover network cable, network switch and at least one client computer;

Connect the two ends of a crossover network cable to the network port of the server computer and the network switch respectively. Pin 8 corresponds to pin 3, pin 6, pin 1, pin 7, pin 8, pin 2, pin 4, pin 5 of the crystal head at the other end;

Connect both ends of a crossover network cable to the client computer and the network port of the network switch. The specific connection method is the 1 pin, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin, and 7 pin Pin 8 corresponds to pin 3, pin 6, pin 1, pin 7, pin 8, pin 2, pin 4, pin 5 of the crystal head at the other end;

S21: Load the software system on the server-side computer, and install LabVIEW software and TCP/IP network communication driver software;

S22: set the port number on the server computer through LabVIEW software, create a waiting TCP listener module, and then generate a listening ID;

S23: Waiting for the TCP listener module to wait for the connection request sent by the client, setting the listening timeout period waiting for the TCP listener module to be 10ms;

If the waiting TCP listener module listens to the connection request of the client within the listening timeout time, then it is judged that the connection request is a valid connection, a connection ID is generated correspondingly, the connection ID is a non-zero value, and at the same time, the connection request sending The remote address of the client, if waiting for the TCP listener module to listen to the connection requests of multiple clients, then correspondingly generate multiple connection IDs respectively, and obtain the remote address of the client at the same time;

If the waiting TCP listener module does not listen to the client connection request within the listening timeout time, it will generate a timeout error signal, the connection ID value is 0, confirm that it belongs to an invalid connection ID, clear the error signal and continue to execute the waiting TCP listener Module, execute in this way;

S24: TCP reading module, the TCP reading module sets the reading timeout time according to the amount of communication data;

If the TCP reading module reads the data successfully, the server-side computer has received the TCP data and performs data analysis processing on the TCP data;

If the TCP reading module fails to read the data, the TCP reading module identifies the wrong cluster information and sends the wrong cluster information and the current connection ID to the error handling and ID screening module;

S25: TCP writing module, the TCP writing module sets the writing timeout time according to the amount of communication data;

Create a cluster-type shift register in the network communication thread to save the TCP write success flag and the data currently prepared to be written by TCP. The initial value of the flag for whether the TCP write is successful or not is set to True, and the initial value of the data written by TCP is prepared. is empty data;

The data to be loaded into the TCP write module can be selected according to the write success flag. If the write success flag value is True, new data will be loaded; if the write success flag value is False, the data in the shift register will be loaded; The data for communication is also written to the shift register at the same time as the TCP is written, so that the shift register is always updated and saved with one frame of data;

If the TCP writing module writes data successfully, the server computer has sent the TCP data, and at the same time, the writing success flag value is True and written to the shift register. If the TCP writing module fails to write data, the TCP writing module identifies Error cluster information and error cluster information and the current connection ID are sent to the error handling and ID screening module, and the successful identification value of writing is False and written to the shift register;

Judging and deciding whether to load the shift register data according to the number of TCP write failures;

S26: Error handling and ID screening module, create a shift register array of connection IDs through LabVIEW, the initial value is set to empty, when the TCP read module or TCP write module is successfully executed, the connection ID is added to the shift register array, When the execution of the TCP reading module or the TCP writing module fails, use the error code in the error cluster to identify the specific circumstances of the error, clear the error cluster information and close the TCP connection, and the connection ID will no longer be added to the shift register array , complete the ID screening, keep the valid connection ID, and close the error reporting ID;

S31: Load the software system on the client computer, install LabVIEW software, TCP/IP network communication driver software;

S32: Create a TCP connection module on the client computer by LabVIEW software, the TCP connection module opens the TCP connection, and sets the address, remote port request connection timeout;

S33: TCP writing module, the TCP writing module sets the connection timeout time according to the amount of communication data;

If the TCP writing module writes data successfully, the client computer has sent TCP data;

If the TCP writing module fails to write data, the TCP writing module identifies the wrong cluster information and sends the wrong cluster information and the current connection ID to the error handling and ID screening module;

S34: TCP reading module, the TCP reading module sets the reading timeout time according to the amount of communication data;

If the TCP reading module reads the data successfully, the client computer has received the TCP data, and then the data can be analyzed and processed;

If the TCP reading module fails to read the data, the TCP reading module identifies the wrong cluster information and sends the wrong cluster information and the current connection ID to the error handling and ID screening module;

S35: an error processing module, using the error codes in the error clusters to identify errors and clear the error cluster information.

Further, steps are also included:

S27: The TCP closing and listener closing module, when it is necessary to exit the network communication, first close the listener ID, then close all TCP connections, and exit the network communication thread.

Further, steps are also included:

S36: TCP closes the module, closes the TCP connection;

If the current client is in continuous communication, the TCP closing module re-enters the creation of the TCP connection module after execution;

If the current client is in discontinuous communication, exit the network communication thread.

Further, in the S22 step, the LabVIEW software sets the port number to 6341 on the server computer.

Further, the shift register is an array type register.

Compared with the prior art, the TCP/IP network communication method based on LabVIEW of the present invention has the following advantages:

The present invention is based on the problems existing in the TCP/IP protocol network communication of LabVIEW, and designs a TCP/IP network connection active reconnection system based on LabVIEW for the problems.

Establish a server-side data buffer mechanism. The server continuously updates the last frame of data through the shift register of the loop structure. Once an error flag occurs in the communication connection, the server sends the latest updated data of the shift register of the loop structure to the client. The setting method can effectively avoid frame loss;

Establish an ID screening and fault tolerance mechanism to filter and close invalid connection IDs caused by communication errors between the server and the client, so that the server will no longer continue to perform write or read actions on the client with a communication error, which will greatly reduce the The burden of the server-side processor makes the server-side system run more smoothly;

Establish a cyclic reconnection mechanism. The client will create a new connection every time it performs a cycle. Even if the network connection is disconnected or unstable and the current communication connection fails, the client will still create a new connection in the next cycle. Allows network connectivity to be restored quickly.

The method of the invention has the advantages of good stability and high reliability.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the signal transfer flowchart of the TCP/IP network communication method based on LabVIEW described in the embodiment of the present invention;

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention Creation and simplification of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The invention will be described in detail below with reference to the accompanying drawings and examples.

The technical problem to be solved by this technical solution is: the client reading error that occurs in the existing TCP/IP network communication, the invalid communication action generated when the client makes an error affects the communication efficiency and the problem that the speed of network reconnection is relatively slow .

In order to solve the above technical problems, as shown in Figure 1, the present embodiment provides a TCP/IP network communication method based on LabVIEW, including the following steps:

S1: Set up the hardware system, including server-side computer, crossover network cable, network switch and at least one client computer;

Connect the two ends of a crossover network cable to the network port of the server computer and the network switch respectively. Pin 8 corresponds to pin 3, pin 6, pin 1, pin 7, pin 8, pin 2, pin 4, pin 5 of the crystal head at the other end;

Connect both ends of a crossover network cable to the client computer and the network port of the network switch. The specific connection method is the 1 pin, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin, and 7 pin Pin 8 corresponds to pin 3, pin 6, pin 1, pin 7, pin 8, pin 2, pin 4, pin 5 of the crystal head at the other end;

S21: Load the software system on the server-side computer, and install LabVIEW software and TCP/IP network communication driver software;

S22: set the port number on the server computer through LabVIEW software, create a waiting TCP listener module, and then generate a listening ID;

S23: Waiting for the TCP listener module to wait for the connection request sent by the client, setting the listening timeout period waiting for the TCP listener module to be 10ms;

If the waiting TCP listener module listens to the connection request of the client within the listening timeout time, then it is judged that the connection request is a valid connection, a connection ID is generated correspondingly, the connection ID is a non-zero value, and at the same time, the connection request sending The remote address of the client, if waiting for the TCP listener module to listen to the connection requests of multiple clients, then correspondingly generate multiple connection IDs respectively, and obtain the remote address of the client at the same time;

If the waiting TCP listener module does not listen to the client connection request within the listening timeout time, it will generate a timeout error signal, the connection ID value is 0, confirm that it belongs to an invalid connection ID, clear the error signal and continue to execute the waiting TCP listener Module, execute in this way;

S24: TCP reading module, the TCP reading module sets the reading timeout time according to the amount of communication data;

If the TCP reading module reads the data successfully, the server-side computer has received the TCP data and performs data analysis processing on the TCP data;

If the TCP reading module fails to read the data, the TCP reading module identifies the wrong cluster information and sends the wrong cluster information and the current connection ID to the error handling and ID screening module;

S25: TCP writing module, the TCP writing module sets the writing timeout time according to the amount of communication data;

This step includes establishing a server-side data buffer mechanism, and the specific steps are as follows:

Create a cluster-type shift register in the network communication thread to save the TCP write success flag and the data currently prepared to be written by TCP. The initial value of the flag for whether the TCP write is successful or not is set to True, and the initial value of the data written by TCP is prepared. is empty data;

The data to be loaded into the TCP write module can be selected according to the write success flag. If the write success flag value is True, new data will be loaded; if the write success flag value is False, the data in the shift register will be loaded; The data for communication is also written to the shift register at the same time as the TCP is written, so that the shift register is always updated and saved with one frame of data;

If the TCP writing module writes data successfully, the server computer has sent the TCP data, and at the same time, the writing success flag value is True and written to the shift register. If the TCP writing module fails to write data, the TCP writing module identifies Error cluster information and error cluster information and the current connection ID are sent to the error handling and ID screening module, and the successful identification value of writing is False and written to the shift register;

Judging and deciding whether to load the shift register data according to the number of TCP write failures;

S26: Error handling and ID screening module, this step includes establishing an ID screening and fault tolerance mechanism, creating a shift register array of connection IDs through LabVIEW, and setting the initial value to empty, when the TCP read module or TCP write module executes successfully Add the connection ID to the shift register array. When the execution of the TCP read module or the TCP write module fails, use the error code in the error cluster to identify the specific situation of the error, clear the error cluster information and close the TCP connection. The connection ID is no longer added to the shift register array, the ID screening is completed, the valid connection ID is retained, and the error reporting ID is closed;

S27: TCP closing and listener closing module, when it is necessary to exit network communication, first close the listener ID, then close all TCP connections, and exit the network communication thread;

S31: Load the software system on the client computer, install LabVIEW software, TCP/IP network communication driver software;

S32: Create a TCP connection module on the client computer by LabVIEW software, the TCP connection module opens the TCP connection, and sets the address, remote port request connection timeout;

S33: TCP writing module, this step includes establishing a cyclic reconnection mechanism, and the TCP writing module sets the connection timeout time according to the amount of communication data;

If the TCP writing module writes data successfully, the client computer has sent TCP data;

If the TCP writing module fails to write data, the TCP writing module identifies the wrong cluster information and sends the wrong cluster information and the current connection ID to the error handling and ID screening module;

S34: TCP reading module, the TCP reading module sets the reading timeout time according to the amount of communication data;

If the TCP reading module reads the data successfully, the client computer has received the TCP data, and then the data can be analyzed and processed;

If the TCP reading module fails to read the data, the TCP reading module identifies the wrong cluster information and sends the wrong cluster information and the current connection ID to the error handling and ID screening module;

S35: an error processing module, using the error code in the error cluster to identify the error and clear the error cluster information;

S36: The TCP closes the module, and closes the TCP connection.

The technical effect of the technical solution provided by this embodiment is: based on the TCP/IP network connection active reconnection system of LabVIEW, this system establishes the data buffering mechanism of the server end, and the server end continuously updates the previous frame through the mobile register of the loop structure Data, once there is an error flag in the communication connection, the server will send the latest updated data of the shift register of the circular structure to the client. This setting method can effectively avoid frame loss; establish an ID screening and fault tolerance mechanism, and the The invalid connection IDs generated by communication errors are screened and closed, so that the server will no longer continue to perform write or read actions on the client with communication errors, which will greatly reduce the burden on the server-side processor and make the server-side system run more efficiently. Smooth; establish a cyclic reconnection mechanism, the client will create a new connection every time it performs a cycle, even if the network connection is disconnected or unstable and the current communication connection fails, but the client will create a new connection in the next cycle connection so that the network connection can be restored quickly.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the protection scope of the present invention.

Claims (5)

1. the TCP/IP network communication methods based on LabVIEW, it is characterised in that comprise the following steps：

S1：Hardware system, including server-side computer, chiasma type netting twine, the network switch and an at least client are set Computer；

By the network interface of the both ends difference connection server end cyber-net interchanger of a chiasma type netting twine, specific connection side Formula corresponds to the 3 of other end crystal head for 1 pin, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin, 8 pin of chiasma type netting twine one end crystal head Pin, 6 pin, 1 pin, 7 pin, 8 pin, 2 pin, 4 pin, 5 pin；

The both ends of one chiasma type netting twine are connected to the network interface of client computer and the network switch, specific connected mode respectively For 1 pin of chiasma type netting twine one end crystal head, 2 pin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin, 8 pin correspond to other end crystal head 3 pin, 6 pin, 1 pin, 7 pin, 8 pin, 2 pin, 4 pin, 5 pin；

S21：In server-side computer load software system, installation LabVIEW softwares, TCP/IP network service drive softwares；

S22：Port numbers, establishment are set to wait TCP detectaphone modules in server-side computer by LabVIEW softwares, and then ID is intercepted in generation；

S23：The connection request for waiting TCP detectaphones module to wait client to send, set and wait intercepting for TCP detectaphone modules Time-out time is 10ms；

If waiting TCP detectaphones module intercepting the connection request that listens to client in time-out time, the connection is judged Ask, effectively to connect, accordingly to produce a connection ID, connection ID is non-zero numerical value, while gets the visitor for sending connection request Family end remote address, if waiting TCP detectaphone modules to listen to the connection request of multiple client, accordingly produce respectively more Individual connection ID, while obtain the remote address of client；

If wait TCP detectaphones module not intercept client connection request is listened in time-out time if produce time-out and report an error Signal, connection ID value are 0, and confirmation belongs to invalid connection ID, remove error signal and continue executing with wait TCP detectaphone modules, So circulation performs；

S24：TCP read modules, TCP read modules set according to amount of communication data size and read time-out time；

If TCP read modules read data success, server-side computer has been received by TCP data and to the TCP data Carry out data dissection process；

If TCP read modules read data failure, TCP read modules identify wrong cluster information and by wrong cluster information and Current connection ID is sent to error handle and ID screening modules；

S25：TCP writing modules, TCP writing modules set write-in time-out time according to amount of communication data size；

It is used for preserving TCP write-in success flags and current preparation in the shift register of network service thread creation cluster type The data of TCP write-ins, the mark initial value of TCP write-in success or not are set to True, and the data initial value for preparing TCP write-ins is sky Data；

The data of TCP writing modules can be selected to be loaded onto according to write-in success flag, if it is True to write successfully ident value, Then load new data；If it is False to write successfully ident value, the data in shift register are loaded；Communicated Data are also write to shift register while TCP writes, and are updated all the time in such shift register and are saved a frame number According to；

If the write-in data success of TCP writing modules, server-side computer has sent TCP data, while writes and successfully mark Knowledge value is that True is write to shift register, if TCP writing modules write data failure, TCP writing modules identification mistake Cluster information simultaneously sends wrong cluster information and current connection ID to error handle and ID screening modules, while writes and successfully mark Knowledge value is that False is write to shift register；

Judged according to the TCP write-ins frequency of failure and decide whether to load shift register data；

S26：Error handle and ID screening modules, the shift register array of connection ID is created by LabVIEW, and initial value is set to Sky, connection ID is added in shift register array when TCP read modules or TCP writing modules run succeeded, when TCP is read When modulus block or TCP writing modules perform failure, concrete condition caused by mistake is identified using the error code in wrong cluster, clearly Except wrong cluster information and carry out closing TCP connections processing, the connection ID is not then added in shift register array, completes ID sieves Choosing, retain effective connection ID, close the ID that reports an error；

S31：In client computer load software system, installation LabVIEW softwares, TCP/IP network service drive softwares；

S32：TCP link blocks are created in client computer by LabVIEW softwares, TCP link blocks open TCP connections, Address, remote port request connection time-out time are set；

S33：TCP writing modules, TCP writing modules set connection time-out time according to amount of communication data size；

If the write-in data success of TCP writing modules, client computer have sent TCP data；

If TCP writing modules write data failure, TCP writing modules identify wrong cluster information and by wrong cluster information and Current connection ID is sent to error handle and ID screening modules；

S34：TCP read modules, TCP read modules set according to amount of communication data size and read time-out time；

If TCP read modules read data success, client computer has been received by TCP data, then can be to the number According to progress data dissection process；

If TCP read modules read data failure, TCP read modules identify wrong cluster information and by wrong cluster information and Current connection ID is sent to error handle and ID screening modules；

S35：Error handling module, wrong cluster information is removed using the error code identification mistake in wrong cluster.

2. the TCP/IP network communication methods according to claim 1 based on LabVIEW, it is characterised in that also include step Suddenly：

S27：TCP close and detectaphone closedown module, it is necessary to exit network communication when, be first shut off detectaphone ID, be then shut off All TCP connections, exit network communication thread.

3. the TCP/IP network communication methods according to claim 1 based on LabVIEW, it is characterised in that：Also include step Suddenly：

S36：TCP closedown modules, close TCP connections；

If active client carries out continuous communiction, TCP closedown modules reenter after performing creates TCP connection moulds Block；

If active client carries out discontinuous communication, exit network communication thread.

4. the TCP/IP network communication methods according to claim 1 based on LabVIEW, it is characterised in that：S22 steps In, it is 6341 that LabVIEW softwares set port numbers in server-side computer.

5. the TCP/IP network communication methods according to claim 1 based on LabVIEW, it is characterised in that：Shift LD Device is array type register.