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Introduction to RS-485 (EIA-485) Networks
Rating: 4.2 out of 5(8 ratings)
39 students

Introduction to RS-485 (EIA-485) Networks

Overview, concepts, troubleshooting and practical application of RS-485 networks with low-cost components.
Created byGustavo Künzel (Kikee), PhD
Last updated 1/2026
English

What you'll learn

  • Understand basics, technical and operational details of RS-485 networks
  • Analyze and perform basic RS-485 network installations
  • Apply RS-485 networks in practice with low-cost hardware (Arduino, TTL/RS-485 module and USB/RS-485 converter)
  • Apply programming concepts for data communication and master-slave protocols
  • Learn programming concepts and the use of Arduino IDE Serial library functions
  • Learn how to identify and troubleshoot typical problems in RS-485 networks

Course content

5 sections • 13 lectures • 1h 27m total length

  • Overview and Applications8:14

    Class Topics:

    • Features of RS-485 Networks

    • Applications

  • Review exercises

Requirements

  • A basic understanding of electronics, DC electrical circuits and microcontrollers
  • A basic understanding about using and programming Arduino platform devices
  • A computer with Windows 10 or higher (it can be done with other Operating Systems, with specific software)
  • Hardware needed for practices: Arduino Uno, TTL/RS485 Module, USB/RS-485 Converter, 120 and 470 Ω resistors, protoboard, jumpers and wires

Description

The "Introduction to RS-485 Networks (EIA-485)" course provides a basic and comprehensive understanding of RS-485 network technology, which is widely used in industrial automation applications. This course is intended for individuals interested in understanding the fundamental principles behind this network technology, from its overview to practical application.

Students will have the opportunity to explore the essential technical concepts behind RS-485 networks, including details about their electronics and components, commonly used communication protocols (master-slave), and network operation. In addition, best practices for the physical installation of these networks will be taught, along with the components necessary to configure and maintain an efficient RS-485 network.

Students will also learn how to identify and troubleshoot common problems that may arise in RS-485 networks, based on knowledge of the electrical concepts of the standard and the use of tools such as a multimeter, oscilloscope, and protocol analyzers.

The practical part of the course focuses on applying the knowledge acquired, using cheap and accessible components such as Arduino boards, modules and converters, to create and implement RS-485 networks. The student will therefore have the opportunity to work and develop prototypes, which will help to solidify theoretical understanding through practice.

Throughout the course, there will be tests with exercises to reinforce concepts and also programming exercises.

The classes are divided into the following sections and topics:

  • Introduction

    • Overview and applications

  • Concepts of RS-485 Networks

    • Electrical Signals

    • Installation

    • Termination Resistors and Fail-Safe Bias

    • Transceivers

    • Converters and Repeaters

    • Grounding

  • Troubleshooting

    • Troubleshooting Common Problems

    • Test Equipment

  • Reference Materials

    • Reference Materials

  • Practice with RS-485 Networks and Arduino

    • Materials and programs

    • Practice 01 - Communication between PC and Arduino using RS-485

    • Practice 02 - Master-Slave Communication between several Arduinos using RS-485

Who this course is for:

  • Technicians, engineers and professionals in the areas of industrial automation, electronics, electrical engineering, computing and networks
  • Designers and developers of embedded hardware and software that uses RS-485 networks
  • Students and enthusiasts in the areas of automation, computing, electronics and electrical engineering
  • Developers of industrial automation solutions using the Arduino platform and/or low-cost components
  • Teachers, who can use the slides and examples to create and develop different projects and activities
  • Technicians and installers of closed-circuit television (CCTV) and professional lighting (DMX512) systems who need knowledge of RS-485 networks

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