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Modbus.Net Overview


Modbus.Net is an open hardware communication platform written in C# 7.0.

You can focus on the protocol itself and the platform can automatically create a full asynchronous or synchronous communication library.

Why is it called Modbus.Net

Modbus.Net was open sourced two years ago when I graduated. The first target of this project was to implement remote PLC communication using Modbus TCP. Half a year later the company decide to use a IoT hardware, then a more universal architecture was required. The main platform changed to a universal communication platform. Despite all these changes the name "Modbus.Net" stuck.

The real Modbus Implementation has been moved to Modbus.Net.Modbus. If you want a real Modbus C# implementation, please download Modbus.Net and Modbus.Net.Modbus at the same time.

There is also Modbus.Net.Siemens that can communicate with Siemens S7-200, S7-200 Smart, S7-300, S7-400, S7-1200 and S7-1500 using PPI or TCP/IP.

Modbus.Net.OPC Implements OPC DA and OPC UA protocol.

Supported Platforms

  • Visual Studio 2017
  • .NET Framework 4.5
  • .NET Standard 2.0


Resharper -- Offers Modbus.Net team community license.


Version 1.2.0

  • Modbus ASCII Support (Complete)
  • Siemens PPI Support (Complete)
  • OPC Write Data (Complete)
  • Get and set bit value (Complete)
  • Unit test (Complete)
  • New Document (Complete)
  • New Samples (Complete)

Version 1.2.2

  • Address Utility (Complete)
  • More functions in TaskManager (Complete)
  • More interfaces (Complete)

Version 1.2.3

  • Endian Problem Fix (Complete)
  • Name mode in TaskManager (Complete)

Version 1.2.4

  • OPC UA Support (Complete)
  • OPC Regex comparer for tags (Complete)

Version 1.3.0

  • .NET Core Support (Complete)
  • Fix a bug in BaseMachine (Complete)

Version 1.3.1

  • InputStruct -> IInputStruct, OutputStruct -> IOutputStruct (Complete)
  • Generic Method For ProtocalUnit (Complete)

Version 1.3.2

  • Add Interface IMachineMethod and IUtilityMethod. Utiltiy and Machine can extend function using interface (Complete)

Version 1.3.3

  • TaskManager Remake (Complete)

Version 1.3.4

  • A Serial Port now can connect to multiple machines using same protocol with different slave address (Complete)

Version 1.3.5

  • New log system using Serilog (Complete)

Version 1.3.6

  • Add gereric Type for BaseConnector, now protocol developer can pass any type to BaseConnector not only byte[] (Complete)
  • Add more gereric types in Modbus.Net to support this function (Complete)
  • Add more interfaces to make them completed in Modbus.Net (Complete)
  • Support this function in Modbus.Net.OPC (Complete)

Version 1.3.7

  • AddressCombiner need to add maximum length now. Combiner will consider the maximum length when combining addresses (Complete)

Version 1.3.8

  • Change Resx to appsettings.json, now you can set default params there (Complete - CORE ONLY)
  • Change ISpecialProtocalUnit to SpecialProtocalUnitAttribute (Complete)

Version 1.3.9

  • Modbus Single Write for Coil and Reg (05 and 06) (Complete)
  • Fix OPC tag combine problem (Complete)

1.3.X Other

  • Github wiki Document Chinese (Complete)
  • Github wiki Document English (Complete)

Version 1.3.10

  • Update to .Net Standard 2.0 (Complete)

Version 1.4.0

  • New Protocol Pipeline System (Coding)

Version 1.4.1

  • BaseController (In Progress)
  • New ComConnector (In Progress)
  • New TcpConnector (In Progress)
  • New UdpConnector (In Progress)
  • Serial Port Connection with Multiple Master Station (In Progress)

Version 1.4.2

  • PPI Remake (In Progress)
  • Siemens MPI Support (In Progress)
  • Siemens MultiStation PPI Support (In Progress)

Version 1.5.X

  • Unite TransServer.Net into Modbus.Net (In Progress)
  • Passive Connector and Controller (In Progress)
  • Architecture rebuild (In Progress)

Version 1.6.X

  • English comment (In Progress)
  • ValueHelper remake to interface, users can add their own value translate function (In Progress)
  • New Zoom (In Progress)

Version 2.0.0

  • Rename to Transport.Net (In Progress)
  • Puzzle System (In Progress)
  • Machine Builder (In Progress)

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