Modbus protocol conversion system based on 3G (The 3rd Generation Telecommunication) Internet access

Abstract

The invention relates to a Modbus protocol conversion device based on 3G (The 3rd Generation Telecommunication) Internet access, belonging to a protocol conversion device in the technical field of Internet. Aiming at the instable problem of 3G dial-up access, in order to ensure the correctness and transparency of data transmission during Modbus protocol conversion, the invention adopts the Modbus protocol conversion device based on 3G Internet access. A remote server, a protocol conversion device and data acquisition equipment are needed for hardware architectures. A 3G script completes dial-up access, and a PPP (Point to Point Protocol) automatically detects the network. When the Internet is turned off or a Ping (Packet Internet Groper) is illogical, automatic redial is conducted. Data communication between the protocol conversion device and the server adopts a Modbus TCP (Terminal Control Protocol), and data communication between the protocol conversion device and the data acquisition equipment adopts a Modbus RTU (Remote Terminal Unit) protocol. Transparent data transmission is realized, the protocol conversion device can quickly detect abnormal disconnection of the Internet and automatically connect the Internet to ensure stable and lasting operation, and the protocol conversion device can be used in more environments.

Description

technical field [0001] The invention relates to a protocol conversion system in the field of network technology, and is a Modbus protocol conversion system. Background technique [0002] There is a basic problem in the remote monitoring system, which is the interconnection of fieldbus and Ethernet. In April 2003, the third edition of the IEC61158 Ed.3 fieldbus standard officially became an international standard, specifying 10 types of fieldbuses. At present, there are many types of fieldbuses with different standards. Therefore, when interconnecting with Ethernet, the first thing to encounter is the problem of protocol conversion. The Modbus protocol invented by Schneider Corporation is a network communication protocol widely used in the industrial field, and it has become a general standard. Through this protocol, the server and the protocol conversion device can communicate via the network. [0003] After searching the existing documents, we found the Chinese patent ap...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of unstable Internet access and low normal access rate of the existing 3G network, the present invention adopts a Modbus protocol conversion system based on 3G Internet acc

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