Free Complete Modbus Tutorial
Learn Modbus by Doing
13 hands-on lessons with a live virtual sandbox. No hardware, no downloads. Fire real Modbus frames in your browser.
Beginner
Master
Send Modbus requests, read registers, write values to a virtual slave device.
0/9 lessons
What is Modbus?
Masters and Slaves
The 4 Register Types
Your First Read — FC03
+ 5 more…
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Intermediate
Slave
Build a virtual slave's register map and watch it respond to incoming requests.
0/4 lessons
Design Your Register Map
Your Slave Answers a Read
Your Slave Handles a Write
Exception Responses
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Advanced
Under the Hood
Decode raw Modbus frames byte-by-byte and interpret 32-bit floats across register pairs.
0/4 lessons
Anatomy of a Modbus TCP Frame
Byte Order and Float32
16-bit & 32-bit Number Formats
64-bit Values — Float64, Int64 & UInt64
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Master
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Slave
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Under the Hood
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