Modbus RTU Online Tools
Professional Modbus RTU online tool suite providing command generation, message parsing, online debugging, and CRC verification functions. Installation-free, supports browser direct serial connection, the essential tool for industrial automation development and debugging.
🎯 Modbus RTU One-Stop Solution
Integrated professional Modbus RTU tool suite combining command generation, message parsing, online debugging, and CRC verification. Supports all standard function codes, multiple data types and byte orders, making your Modbus development and debugging more efficient.
⭐ Why Choose Our Modbus RTU Tools?
🚀 Installation-free, direct browser use
🔧 Supports all Modbus RTU function codes
📊 Multiple data types and byte orders
🔍 Intelligent message parsing and verification
📱 Responsive design, mobile support
🌍 Multi-language support (CN/EN/ES)
🎯 One-click standard command generation
🔒 Local processing, data security
🎯 Main Application Scenarios
Industrial Automation Debugging
Debug PLCs, frequency converters, instruments and other Modbus devices
Typical Scenarios:
- Device Communication Testing
- Parameter Reading Configuration
- Fault Diagnosis Troubleshooting
Device Integration Development
Develop Modbus master or slave programs
Typical Scenarios:
- Protocol Verification Testing
- Data Format Confirmation
- Compatibility Testing
System Maintenance Operations
Production line equipment maintenance and data collection
Typical Scenarios:
- Regular Data Collection
- Device Status Monitoring
- Historical Data Analysis
🚀 Get Started Now
No registration required, no download needed, open your browser to use the complete Modbus RTU tool suite. Supports direct serial connection, making your device debugging simpler and more efficient.
📚 Modbus RTU Protocol Knowledge
What is Modbus RTU?
Modbus RTU (Remote Terminal Unit) is a serial transmission mode of the Modbus protocol, using binary encoding and CRC verification, characterized by high transmission efficiency and strong error detection capability. It is widely used for communication between devices in industrial automation systems.
Key Features:
- Binary data format, high transmission efficiency
- CRC16 verification, strong data reliability
- Supports RS485 multi-point communication
- High standardization, good compatibility
Modbus RTU Frame Structure
A standard Modbus RTU frame consists of the following parts:
[Slave Address][Function Code][Data Area][CRC Checksum]- Slave Address: 1 byte, identifies the target device：
- Function Code: 1 byte, specifies the operation type：
- Data Area: N bytes, contains address and data：
- CRC Checksum: 2 bytes, ensures data integrity：
Common Function Codes
Read Function Codes:
- 01: Read Coil Status
- 02: Read Discrete Inputs
- 03: Read Holding Registers
- 04: Read Input Registers
Write Function Codes:
- 05: Write Single Coil
- 06: Write Single Register
- 15: Write Multiple Coils
- 16: Write Multiple Registers
CRC Verification Algorithm
Modbus RTU uses the CRC-16 verification algorithm with polynomial 0xA001. The verification process ensures data transmission reliability and is an important component of the Modbus RTU protocol.
Verification Features:
- 16-bit cyclic redundancy check
- Polynomial: 0xA001
- Initial value: 0xFFFF
- Low byte first transmission
💡 Using our online tools, you can easily generate and parse Modbus RTU messages without needing to understand these technical details in depth.