Facebook
Google
GitHub
Linkedin
Hi everyone,
I recently organized and released two Modbus debugging tools that I maintain personally, and I would like to share them here for testing and feedback.
The first one is MBSim, a Modbus RTU/TCP slave simulator. It is mainly designed for testing PLC, HMI, SCADA, or host-side Modbus applications when no real slave device is available. It can be used to simulate Modbus devices, test master read/write operations, check register mapping, and debug RTU/TCP communication.
The second one is ModbusGateway, a Qt-based Modbus TCP
RTU software gateway. It forwards requests and responses between Modbus TCP and Modbus RTU, supporting both “TCP master to RTU slave” and “RTU master to TCP slave” scenarios.
Licensing note:
MBSim: free to use, but not open source. Source code is not published.
ModbusGateway: MIT License, source code is available.
Downloads / repositories:
MBSim: https://github.com/louisir/mbsim-dist
ModbusGateway: https://github.com/louisir/ModbusGateway
I am especially interested in feedback on:
MBSim compatibility with different PLC, HMI, and SCADA software
Whether RTU serial settings, TCP listening, and register mapping match real-world usage
ModbusGateway stability and exception handling during TCP RTU conversion
Useful future features, such as multiple slaves, multiple TCP clients, register-table import, exception-code simulation, or scripted responses
If this kind of tool-sharing post is not suitable for this section, please let me know and I will remove or adjust it. Thank you.
I recently organized and released two Modbus debugging tools that I maintain personally, and I would like to share them here for testing and feedback.
The first one is MBSim, a Modbus RTU/TCP slave simulator. It is mainly designed for testing PLC, HMI, SCADA, or host-side Modbus applications when no real slave device is available. It can be used to simulate Modbus devices, test master read/write operations, check register mapping, and debug RTU/TCP communication.
The second one is ModbusGateway, a Qt-based Modbus TCP
RTU software gateway. It forwards requests and responses between Modbus TCP and Modbus RTU, supporting both “TCP master to RTU slave” and “RTU master to TCP slave” scenarios.Licensing note:
MBSim: free to use, but not open source. Source code is not published.
ModbusGateway: MIT License, source code is available.
Downloads / repositories:
MBSim: https://github.com/louisir/mbsim-dist
ModbusGateway: https://github.com/louisir/ModbusGateway
I am especially interested in feedback on:
MBSim compatibility with different PLC, HMI, and SCADA software
Whether RTU serial settings, TCP listening, and register mapping match real-world usage
ModbusGateway stability and exception handling during TCP
RTU conversionUseful future features, such as multiple slaves, multiple TCP clients, register-table import, exception-code simulation, or scripted responses
If this kind of tool-sharing post is not suitable for this section, please let me know and I will remove or adjust it. Thank you.
