CD Industrial Group Inc.

Simulations & Hands-On Learning Challenges
Level III
2 Day
Instructor-Led Course

Serial Communications: RS-232, RS-485, Modbus Serial, Modbus+

This course teaches the fundamental principles of serial communications for the process environment. Electronics technicians and instrumentation specialists learn the layers, protocols, limitations and electrical parameters, involved.

The Modbus serial protocol and message format is thoroughly covered along with the register map and exception codes.

Modbus Plus networking with its node structure token rotation is taught, along with addressing, cabling and use of taps and terminators.

Basic Principles Of Digital Communication


Activity: Utilize a RS-232 break-out box to confirm pin assignment and device role

Master the basics of serial communications!

Modbus Serial Protocol


Activity: Use a Modbus simulator and work with RTU and ASCII mode states

Know your master-slave, query-response communications

Modbus Plus Network


Activity: Cable and install three types of Modbus Plus taps

Use MBP Stat software to diagnose like a pro!

Where to go from here?

Serial Communications Basics is part of a general instrumentation training plan, to prepare students for PID Control System Troubleshooting, and our advanced class, Applied Automation & Process Control.

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