Modbus and OPC UA drivers for .NET

Packages

Four packages, one contract

Proxus.Drivers.Modbus

Modbus master over TCP, with RTU and ASCII framing through a gateway or a serial stream you open. Coils, discrete inputs, holding and input registers, typed values and read planning.

Proxus.Drivers.OpcUa

OPC UA Binary client: SecureChannel with None, Basic256Sha256, Aes128_Sha256_RsaOaep and Aes256_Sha256_RsaPss; Session, Read, Write, Browse, subscriptions, history, methods and events.

Proxus.Drivers.Abstractions

Protocol-neutral values, quality, timestamps, errors and the common driver contract.

Proxus.Drivers.Core

Socket and timeout plumbing shared by the drivers.

Protocol guides

Modbus guide OPC UA guide Evidence levels

Quick start

Read a register and a node

Install (preview packages)

dotnet add package Proxus.Drivers.Modbus --prerelease
dotnet add package Proxus.Drivers.OpcUa --prerelease

Modbus TCP: read two holding registers

using Proxus.Drivers.Modbus;

await using var client = new ModbusTcpClient(new ModbusTcpOptions
{
    Host = "192.168.1.10",
    Port = 502,
    UnitId = 1,
    ConnectTimeout = TimeSpan.FromSeconds(5),
    RequestTimeout = TimeSpan.FromSeconds(5)
});

var connected = await client.ConnectAsync();
if (!connected.IsSuccess) { Console.Error.WriteLine(connected.Error.ToUserMessage()); return; }

var registers = new ushort[2];
var read = await client.ReadHoldingRegistersAsync(0, registers);
Console.WriteLine(read.IsSuccess ? $"hr:0 = {registers[0]}" : read.Error.ToUserMessage());

OPC UA: read the server clock (error handling left out)

using Proxus.Drivers;
using Proxus.Drivers.OpcUa;

await using var client = new OpcUaTcpClient(new OpcUaTcpOptions
{
    EndpointUrl = new Uri("opc.tcp://192.168.1.20:4840")
});

await client.ConnectAsync();
await client.OpenAnonymousSessionAsync();
var read = await client.ReadAsync(new OpcUaNodeDescriptor(IndustrialNodeId.Numeric(0, 2258)));
Console.WriteLine($"{read.Value.Value}; quality={read.Value.Quality}");