Network protocol converter based on software and hardware protocol stacks and protocol conversion method

Abstract

The invention discloses a network protocol converter based on software and hardware protocol stacks and a protocol conversion method. The network protocol converter comprises a microprocessor, an upper end interface expansion circuit, a lower end interface expansion circuit, a memory and a power supply circuit. The method comprises the steps that an upper computer sends a TCP / IP protocol to a microprocessor, and whether data meet a communication protocol or not is judged, wherein if not, the upper computer is requested to resend the data, and if yes, the data are stored in a memory, recoded and sent to a lower computer; the lower computer performs inspection after receiving the free protocol, collects free protocol response data and feeds back the data to the microprocessor; the microprocessor judges whether the data meets the protocol specification or not, wherein if not, the upper computer is requested to resend the data, and if yes, protocol conversion is performed and the data is sent to the upper computer. Mutual conversion between a free protocol and a Modbus RTU protocol and between the free protocol and a TCP / IP protocol can be achieved, the requirements for field-level control and remote control are met, and good universality and applicability are achieved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a network protocol converter and a protocol conversion method based on software and hardware protocol stacks. Background technique [0002] With the increasing degree of modernization, the modern communication control system has developed into a control network with a complex structure composed of various sensors, controllers, actuators and various subsystems with specific functions. The sensing module is composed of sensors, converters and transmitters; as a key subsystem in the control system, the data acquisition and monitoring system usually consists of a large number of sensing modules, transmitters and controllers; A programmable controller (Programmable Controller, PLC) usually integrates a transmitter and a controller for controlling specific functional processes. Therefore, a modern communication control system usually uses a PC or a PLC as the upper computer, thr...

AI Technical Summary

Problems solved by technology

Although the protocol converter for transplanting the OPC UA protocol stack can realize the communication between some corresponding different devices, it has the disadvantages of inflexibility, high bit error rate, slow transmission rate, etc., and cannot meet the needs of modern communication systems. According to the needs of different application environments

Images