A data communication system and method capable of resumed data transmission

Abstract

The present invention provides a data communication system capable of resuming transmission from breakpoints, including a client and a server, communication between the client and the server, a heartbeat mechanism is added to the client to monitor the network connection status between the client and the server; the client connects itself The generated data is sent to the server in real time, and at the same time, a storage queue is established in the client to save the sent data packets. The server stores the successfully received data in the database in chronological order and returns a response packet; the client receives the reply packet according to Judging whether there is a network failure according to the situation, find the data packets that were not sent successfully when the network failure occurred in the storage queue, and resend to complete the breakpoint resume. The solution proposed by the invention can meet the system-intensive real-time operation requirements widely existing in the industrial automation system, improve the transmission efficiency and reduce the loss of real-time data as much as possible.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a data communication system and method capable of resuming transmission from breakpoints. Background technique [0002] Whether it is long-distance network data communication or short-distance data communication between devices, the logical relationship between communication entities can usually be divided by client and server. In a simple system, servers and clients exist one-to-one; in complex systems, servers and clients exist one-to-many. The application background of the present invention is the welding operation process of a certain welding robot. The welding robot (as a client) needs to send relevant information of the current welding torch (welding torch information, welding wire information, gas information, nozzle information, welding torch speed) during the operation and after the operation is completed. Position temperature, weld width and height, power consumption,...

AI Technical Summary

Problems solved by technology

This operation needs to consider two issues: first, it is necessary to know when the connection state between the client and the server is lost. The data transmission process is still carried out. Obviously, the data sent at this time has not been received by the server (but the client will think that the server has received it); second, in order to prevent the data transmission failure of the client due to disconnection, it is necessary to consider storing the data in advance. The sent data is backed up, waiting for the network to recover and resume the breakpoint data

This query method is not only time-consuming but also consumes too much bandwidth resources. Every time the normal sending and receiving of business data will first perform a status query, the efficiency is very low. If the amount of data to be sent is large and the sending frequency is high, this This method will lead to a large amount of data accumulation, which is not feasible in practical applications

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