Analysis and Design of Microcontroller Based Modbus Controller

Abstract

Modbus protocol is the most popular industrial protocol being used today, for good reasons. It is simple, inexpensive, universal and easy to use. Even though MODBUS has been around since the past century (nearly 30 years) almost all major industrial instrumentation and automation equipment vendors continue to support it in new products. In this thesis, the Design and analysis of a Modbus controller on a base of Microcontroller has been discussed, including the design of the Master by mean of software on PC, and the Slave by means of hardware which includes ATmega 16 as the main part. The main objective of this thesis is to illustrate the basic structure of Modbus controllers and how they will communicate through Modbus Protocol. The system is designed to facilitate data transmission between devices to enable different control procedures and data exchange.