DETEL SERIAL DATA TRANSMISSION PROTOCOL FOR THE COMMUNICATION OF AN IBM-PC WITH THE MDxx SERIES OF PROGRAMMABLE LOGIC CONTROLLERS

Abstract

In this paper a new serial transmission protocol, DETEL, is designed and presented. DETEL protocol is developed to provide a reliable communication between an IBM-PC and a Programmable Logic Controller, PLC, of type MDxx series. Here the IBM-PC acts as a master (programmer) device and the PLC acts as a slave device. The integrity of the data to be transferred is discussed. OSI model of the DETEL protocol is presented. Link-layer and application-layer protocols are implemented. DETEL Protocol is implemented on both master and server side devices. A software driver is developed for the master device in C++. A micro-controller board, on which a virtual PLC machine of type MDxx series is installed, is used as a slave device. A driver for the slave device is developed in avr-assembler language.