LibModbus

Library to send/receive data with a device which respects the Modbus protocol for dotnet.

Install

Install the NuGet package into your project.

PM> Install-Package LibModbus

$ dotnet add package LibModbus

Supported Functions

• 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)

Usage

Client Builder

var address = "127.0.0.1";
await using var client = new ModbusClientBuilder()
                        .UseSocket(address)
                        .Build();

Connect And Read Coils

await client.ConnectAsync();

var coils = await client.ReadCoils(2, 10);

var index = 2;
foreach (var coil in coils)
{
    var onOrOff = coil ? "on" : "off";
    Console.WriteLine($"Coil {index++} is {onOrOff}");
}

Protocol-Specification

• MODBUS Application Protocol Specification v1.1b3 (PDF)
• MODBUS over serial line specification and implementation guide v1.02 (PDF)
• MODBUS Messaging on TCP/IP Implementation Guide v1.0b (PDF)

License

Copyright 2020 Nick Van Dyck

MIT