Data transmission method and system

Abstract

The embodiment of the invention discloses a data transmission method and a data transmission system. The method comprises that: a first terminal splits data information to be transmitted to a second terminal, and packs the data information into data packets, wherein the data packet comprises a packet header and a packet body; the first terminal transmits the data packet to the second terminal, and waits for a receiving response fed back by the second terminal; if receiving the receiving response fed back by the second terminal in a preset time limit, the first terminal transmits the next data packet to the second terminal until all the data packets are transmitted to the second terminal; and if not receiving the receiving response or a retransmission request fed back by the second terminal in the preset time limit, the first terminal retransmits the latest transmitted data packet to the second terminal until the number of retransmission times exceeds a preset threshold. By the data transmission method and the data transmission system provided by the invention, errors can be rapidly and effectively corrected and remedied in a serial communication process so as to improve the quality of serial communication.

Description

technical field [0001] The present invention relates to the field of data transmission, in particular to a data transmission method and system. Background technique [0002] In the field of communication, there are two data communication methods: parallel communication and serial communication. Compared with parallel communication, serial communication uses fewer lines and lower cost, especially in long-distance transmission, avoiding the inconsistency of the characteristics of multiple lines, so it is widely used in various occasions such as the communication field. Especially in the field of industrial control, serial communication is often used as a medium for information collection and data transmission. [0003] There are many serial communication standards at present, and the standards that people are familiar with include EIA-232, EIA-422 and EIA-485, which are previously called RS-232, RS-422 and RS-485. However, none of these standards can make a very accurate jud...

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Problems solved by technology

However, none of these standards can make a very accurate judgment on the correctness of the data sent or received, and cannot remedy the error situation during the transmission process.

[0004] In the actual serial communication operation process, due to factors such as electromagnetic interference or voltage instability, serial data transmission fails or data errors are often caused. The traditional processing method is to resend all the data to be sent or manually restart the data transmission process. , and in the process of large-scale mass production products, this is undoubtedly very time-consuming and laborious

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