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Web Serial Modbus RTU Master

Resources

Modbus.org
The official site offers extensive technical resources including specifications, FAQs, and software tools related to Modbus protocol.Modbus.org

Wikipedia
This is where detailed descriptions of the Modbus Protocol are listed. You can look at the packet structure of the protocol and descriptions of each part.Wikipedia

NI (National Instruments)
Provides a clear breakdown of how Modbus works, including the layers of the protocol, function codes, and how Modbus data models are structured​.National Instruments

Protoconvert.com
Offers a detailed Modbus tutorial covering topics such as RTU, TCP, addressing models, and error-checking methods​.Protoconvert.com

Lammert Bies
A well-structured guide that covers Modbus communication types, function codes, and addressing schemes, particularly helpful for learning about both Modbus RTU and ASCII.Lammert Bies

NetBurner
Offers detailed explanations of Modbus message framing, function codes, and device addressing with practical examples, particularly useful for embedded system developers.NetBurner