Mastering Modbus RS485 Network Communication

Learn how to design, implement and manage the most popular automation networking system in the world.

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What Do You Get?

3.5 hours of video instruction
88 lessons
29 downloadable resources
Unlimited access
Certificate of Completion
30 day money back guarantee

How Will This Course Benefit You?

The Modbus protocol is the oldest and still by far the most popular automation protocol in the field of process automation and SCADA. Knowing how to create Modbus based networks that run on the RS485 serial communication standard is essential for any electrical technician and engineer working in these fields. Being able to integrate devices from different manufacturers is a skill that is in demand and will ultimately make you more valuable and marketable in the industry.

This course gives you the theory behind the Modbus Protocol as well as RS485. It then goes on to show you how they work together to create a Modbus RS485 network. Two freeware applications are then used to create a Modbus network right on your PC so you can see the communication in action.

After completing this course, you will be able to integrate devices from the same manufacturers and different manufacturers, that are Modbus compliant, to form a complete seamless network.

In this course, you will learn about:

- The Origins of the Modbus Protocol and RS485.
- Understand Memory Address vs. Memory Value.
- Memory Addressing Conventions.
- Typical Device Memory Map.
- Protocol Network Messaging.
- RS485 Standard and Device Interconnection.
- Protocol Data Frame Structure.
- Query - Response Cycle.
- Function Codes and Master Commands.
- Modbus Simulation using FREE Simulation Software.
- Troubleshooting and Exception Codes.
- Floating Point Data Structure.
- Modbus Communication with Programmable Logic Controller.

Are there any requirements?

- Familiarity with process control devices in a typical Process Automation or SCADA system.

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Course curriculum

1. Importance of Modbus RS485
2. Accessing Attached Resources
3. Contacting Your Instructor
1. History of the Modbus Protocol
2. History of RS485
3. Common Misconceptions
1. The Design Problem
1. Modbus RTU vs. ASCII
2. Modbus Device Components
3. Memory Address vs. Value
4. Memory Block Sizes
5. The Modbus Memory Map
6. Modbus Memory Map Exceptions
7. Determining I/O Mapping to Memory
8. Application to our Design Problem
1. Messaging Method
2. Modbus Unit ID
3. Modbus Request Commands
4. Modbus Block Reads
5. Application to our Design Problem
1. Physical Connection
2. Port Settings
3. Application to our Design Problem
1. From Theoretical to Practical
2. Introducing the Query-Response Cycle
3. Composition of the Query-Response Cycle
4. The Byte Notation
5. The Read Input Registers Query-Response Cycle Part 1
6. The Read Input Registers Query-Response Cycle Part 2
7. The Read Input Registers Query-Response Cycle Part 3
8. The Read Input Registers Query-Response Cycle Part 4
9. The Read Input Registers Query-Response Cycle Part 5
10. The Read Input Registers Query-Response Cycle Part 6
11. The Read Input Status Query-Response Cycle Part 1
12. The Read Input Status Query-Response Cycle Part 2
13. The Read Input Status Query-Response Cycle Part 3
1. Basic Guidelines
2. Identifying the Modbus Software Tools
3. Downloading the Modbus Software Tools
4. Introduction to Virtual Serial Port
5. Introduction to Modscan32
6. Introduction to Modsim32
7. Simulating the Read Input Registers Command
8. Data Traffic for Read Input Registers Command
9. Simulating the Read Input Status Command
10. Data Traffic for the Read Input Status Command
1. Simulating the Read Holding Registers Command
2. Data Traffic for the Read Holding Registers Command
3. Simulating the Read Coils Status Command
4. Data Traffic for the Read Coils Status Command
5. Modbus Write Commands
6. Downloading the CAS Modbus Scanner
7. Viewing Data Traffic in Hexadecimal Format
8. Updated Application Design Problem
9. The Force Single Coil Query-Response Cycle
10. Simulating the Force Single Coil Command
11. The Preset Single Register Query-Response Cycle
12. Simulating the Preset Single Register Command
1. Introduction
2. Exception Codes
3. The Query-Response Cycle for an Exception Response
4. Simulating an Exception Response
1. Modbus Data Type Limitations
2. Floating Point Forms
3. Floating Point Format
4. Floating Point Online Conversion Tool
5. Simulating Floating Point Communication
6. Simulating Swapped Floating Point Communication
1. Introduction
2. Overview of the Direct Logic 05 PLC
3. The 2 Steps to Configuring Modbus on a Physical Device
4. Looking at the Direct Logic PLC on my desk
5. Direct Logic 05 Documentation for Communications Port Configuration.
6. Using the DirectSoft 6 Configuration Software to configure Modbus
7. Direct Logic 05 Documentation for Modbus Memory Map
8. Switching the Communications Cable from Port 1 to Port 2
9. Closer look at the Modbus Mapping within the PLC
10. Using Modscan32 to Read/Write for Coils
11. Using Modscan32 to Read Input Statuses
1. Print These 2 Documents and Keep Them Close
1. Modbus History and Overview
2. Modbus RTU vs ASCII
3. Modbus Message Structure
4. Modbus Serial Transmission Modes
5. Modbus Addressing
6. Modbus Function Codes
7. RS485 Serial Communication Standard

About this course

$10.00
87 lessons
3.5 hours of video content