RS485 & Modbus Protocol Guide

The MODBUS protocol "defines a message structure that controllers will recognize and use, regardless of the type of networks over which they communicate. It describes the process a controller uses to request access to another device, how it will respond to requests from the other devices, and how errors will be detected and reported. It establishes a common format for the layout and contents of message fields." - Modbus Protocol Reference Guide, PI-MBUS-300 Rev. J. This document may be purchased from "Groupe Schneider, Basingstoke, England 44 (0) 1256 843184. There are a number of hardware configurations used for MODBUS networks, this guide will consider only the two wire RS485 network as that is the configuration currently supported by the SPR and Integra family of products.




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