MODBUS CHINA TECHNICAL NETWORK

Modbus Chinese Network

Targeting automation engineers, equipment manufacturers, and IoT developers, we provide Modbus protocol documentation, online debugging, product selection, and solutions.

Enter the debugging tool View technical documentation

RTU / TCP / ASCII Register Mapping CRC and message parsing

Protocol frame structure

← PDU →

01 1 byte

03 1 byte

00 01 00 02 4 bytes

95 CRC low

CB CRC high

2 bytes

Complete frame: 01 03 00 01 00 02 95 CB 8 bytes

← MBAP message header →

← PDU →

00 01 2 bytes

00 00 2 bytes

00 06 2 bytes

01 1 byte

03 1 byte

00 01 00 02 4 bytes

Complete frame: 00 01 00 00 00 06 01 03 00 01 00 02 12 bytes

← PDU →

: 1 character

01 2 characters

03 2 characters

00 01 00 02 8 characters

B8 2 characters

CR LF 2 characters

Complete frame: :010300010002B8C4\r\n 17 characters

Beginners on the road Start learning from this frame Follow 01 03 00 01 00 02 95 CB to disassemble the address, function code, data, and verification Start learning

985+ Technical data and articles

33 Protocol and Industry Classification

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Whether you are an automation engineer, equipment manufacturer, or system integrator, you can find the required protocol information, debugging tools, and industry solutions here.

Protocol database

Modbus RTU、TCP、ASCII、 Function code, exception code, register, and message format.

Online Tools

Serial port debugging, TCP debugging, CRC calculation, message parsing, free online use.

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