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Modbus has been around for years and is utilised comprehensively by Industry
The following technical information is from Moore
Using MODBUS for Process Control and Automation - MODBUS 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 for nearly 30 years, almost all major industrial instrumentation and automation equipment vendors continue to support it in new products. This white paper discusses how MODBUS works and a few clever ways it can be used in new and legacy plants.
Modbus Protocol - This is an excellent Modbus Reference
Chapter 1 Modbus Protocol
Chapter 2 Data and Control Functions
Chapter 3 Diagnostic Subfunctions
Chapter 4 Exception Responses
Chapter 5 Application Notes
Chapter 6 LRC / CRC Generation
Modbus Interface Tutorial - Covers History of the Modbus protocol, Modbus message structure, Modbus serial transmission modes: Modbus/ASCII and Modbus/RTU, Modbus addressing, Modbus function codes - Thanks to Lammert Bies.
Modicon Modbus Protocol Reference Guide - This guide is written for the person who will use Modicon Modbus protocols and messages for communication in Modicon programmable controller applications. It describes how messages are constructed, and how transactions take place using Modbus protocol. This guide should be used in conjunction with Modicon user guides for the types of networks and programmable controllers present in the application. Familiarity with your network layout, and with your control application, is assumed -from eecs.
What you should know about Modbus - A good description from Modbus Driver.com
Asked Questions about Modbus - The following questions
are answered by "Simply Modbus"
What is Modbus?
What is it used for?
How does it work?
What is hexadecimal?
How is data stored in Standard Modbus?
What is a function code?
What is a CRC?
What are the formats of Modbus commands and responses?
What are data types?
What is byte and word ordering?
What is a Modbus Map?
What is the difference between Modbus ASCII and Modbus RTU?
What are extended register addresses?
How does 2-byte addressing work?
How can you send events and historical data?
What is Enron Modbus?
1.11 How Real and 32-bit Data is Encoded in Modbus RTU - This article discusses some of the typical difficulties encountered when handling 32-bit data types via Modbus RTU and offers practical help for solving these problems - from chipkin.com.
September 2010 and October
2010 CAS newsletters have some Excellent Modbus Information - Included
in these two parts is; MODBUS
- Introduction, 4
types of data, There
are (were) a Max of
9999 points of each data type, 5
Digit vs 6 Digit Addressing, What
about Scaling In Modbus, Floating
Point Numbers In Modbus, Byte/Word
Order An ambiguous
Order - Sometimes its a problem too, Modbus
and Gateways, What
about errors / exceptions, There
can only be one master on a
Modbus Specifications - Download the current versions of Modbus specifications and implementation guides - from modbus.org.
Modbus Technical Resources - from modbus.org
Ricardo Saat's Modbus page - Some useful information here.
A Modbus Users' Community - a useful Forum
Free Modbus Software - From Wikipedia, the free encyclopedia