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ToolsProtocols & networksModbus

Modbus

Addressing, register decoding, RTU frames and CRC

Modbus Address Converter Modbus Data Converter Modbus RTU Frame Parser Modbus CRC16 Calculator Modbus TCP / MBAP Parser Modbus Frame Builder

Background

What is Modbus
Modbus addressing — 40001 vs. offset 0
Modbus function codes and exceptions
Modbus ASCII — frame format and LRC
Modbus RTU — frame, timing and CRC
Modbus TCP — MBAP header and gateways
Common Modbus problems and how to find them

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