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Modbus TCP, Modbus UDP and Modbus RTU client/server library for .NET

Supports Function Codes:

- Read Coils (FC1)
- Read Discrete Inputs (FC2)
- Read Holding Registers (FC3)
- Read Input Registers (FC4)
- Write Single Coil (FC5)
- Write Single Register (FC6)
- Write Multiple Coils (FC15)
- Write Multiple Registers (FC16)

V5.6: Upload lates version
- This will probably the last version for .NET Framework 4.0
- The next Version will be based on new .NET5 and redesigned

V5.5: Bugfixes and MQTT Bridge removed

V5.0: Major Bugfixes and Event Handlers changed

V4.4 HF1: Bugfix excessive CPU-Load Modbus TCP Server

V4.4: Bugfix Modbus RTU and MQTT

V4.3: Bugfixes Modbus RTU
Webview for Modbus Server Simulator and MQTT functionality for Server

Features

  • Modbus TCP
  • Modbus RTU
  • Modbus UDP

Project Samples

Play Video EasyModbusTCP/UDP/RTU .NET Screenshot 1 Build your own .NET applications with data exchange to Siemens STEP 7 Devices

Project Activity

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Categories

Communications, Software Development, Scientific/Engineering

License

MIT License

Follow EasyModbusTCP/UDP/RTU .NET

EasyModbusTCP/UDP/RTU .NET Web Site

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User Ratings

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User Reviews

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  • mcamsmith Posted 2026-06-16
    This really helped me to get started with Modbus protocol. Thank you for sharing.
  • dmazzoli Posted 2022-11-19
    Very easy to use and functional. Thank you very much for sharing it!
  • customiot Posted 2020-10-27
    Tested perfectly with Modbus TCP and Modbus RTU - Thankyou
  • ratan999 Posted 2020-06-18
    Cannot read values from readinputregisters method which contains values above 32767
    1 user found this review helpful.
    Reply from EasyModbusTCP/UDP/RTU .NET
    Edited 2020-06-20
    You can read Values above 32767. They are represented as negative values, so you have to convert it. What you describe is not a library related problem, thats a very basic C# programming task to convert. (Google helps ;-))
  • cpadsala Edited 2019-02-19
    Great library. Works unbelievably well. Thanks!!
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Additional Project Details

Languages

English, German

Programming Language

C#

Related Categories

C# Communications Software, C# Software Development Software, C# Scientific Engineering

Registered

2013-04-12
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