Modbus RTU / TCP Analyzer

Comprehensive Modbus Frame Analysis

The Modbus Parser provides a robust environment to construct and analyze Modbus RTU and TCP frames directly in your browser. It allows you to build custom request packets, automatically verify CRC-16 checksums for serial communication, and decode complex response fields from industrial devices. By supporting various function codes such as reading coils or holding registers, the tool helps engineers interpret raw hex data into meaningful values quickly and accurately during the development of industrial automation systems.

Industrial Communication Debugging

This tool is ideal for developers and engineers working with PLCs, sensors, and industrial gateways. Use it to test Modbus RTU serial connections or TCP network requests without needing complex local software installations. It simplifies the process of identifying illegal function codes, data addresses, or server errors. By visualizing the structure of your packets, you can troubleshoot communication issues between your master controller and slave devices effectively during the integration phase.

How can I check the CRC-16 for Modbus RTU?

The tool automatically calculates and verifies the CRC-16 checksum when you input your hex bytes. This ensures that your Modbus RTU frames are valid before transmission over a serial connection, helping you identify errors in the packet structure or communication sequence between the master and slave devices.

Does the tool support both Modbus RTU and TCP?

Yes, the Modbus Parser supports both RTU and TCP protocols. It includes a dedicated analyzer for TCP clients and a frame parser for serial connections. This allows you to test different communication methods and decode data from various types of industrial hardware using a single web-based interface.

Can I use this tool to debug Modbus function codes?

Yes, the tool identifies common response codes such as illegal functions, illegal data addresses, and server device failures. By decoding request and response fields, you can pinpoint exactly where a communication error occurs in your industrial network, making it an essential debugging tool for automation projects.

Is my data processed on a remote server?

No, the Modbus Parser processes all data locally within your web browser. By utilizing technologies like the Web Serial API, your raw hex strings and connection details remain on your local machine. This ensures that sensitive industrial network information is never transmitted to or stored on an external server.