Modbus serial communication method for industrial equipment

Abstract

The invention discloses a Modbus serial communication method for industrial equipment, and provides a cloud-based service architecture and a corresponding communication mechanism. The Modbus slave industrial device is connected with the Internet through the DTU to actively establish TCP connection with the cloud service, and then the cloud service reversely sends an instruction to the slave deviceby using the established connection, so that a Modbus master-slave communication mechanism is realized, and the problem that a large number of Modbus devices are connected by using a telescopic cloudservice mode, the Slave ID and the IP address are not enough to identify one device, and meanwhile, a large number of Internet data processing tools are difficult to be directly used for Modbus dataand other problems due to incompatibility of data can be solved.

Description

technical field [0001] The invention relates to an industrial equipment service architecture under cloud and Internet environments, in particular to a method for industrial equipment Modbus serial communication. [0002] technical background [0003] Modbus is a protocol widely used in the field of industrial automation. A large number of existing industrial equipment supports the Modbus protocol, and exchanges data with the outside world through serial ports. These devices often run on a point-to-point or small-scale serial network. The device uses the SlaveID of 1-255 as the identification, and sends instructions and exchanges data through the master-slave mode. The command is issued by the master device, and the slave device executes the operation after receiving the command, and returns the result or corresponding data. [0004] In recent years, with the development of the Internet, how to connect and operate serial Modbus devices to the monitoring system (master devic...

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Problems solved by technology

[0004] In recent years, with the development of the Internet, how to connect and operate serial Modbus devices to the monitoring system (master device) running on the Internet cloud service has gradually become the biggest challenge for industrial remote monitoring. For example, virtual serial ports require system-level settings. And it needs to occupy a dedicated machine, it is difficult to connect a large number of Modbus devices with a scalable cloud service model; secondly, the Internet environment needs to connect a large number of devices from different networks, and SlaveID and IP address are not enough to identify a device; Data incompatibility, a large number of Internet data processing tools are difficult to directly use Modbus data

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