c# modbus rtu

Modbus RTU is a widely used protocol for serial communication in the industrial automation sector, including in the field of SCADA systems. It is commonly implemented using the C# programming language.

To communicate with Modbus RTU devices using C#, you can use third-party libraries like NModbus or EasyModbus. These libraries provide classes and methods to handle Modbus RTU communication.

Here is an example of how to use NModbus library to read holding registers from a Modbus RTU device using C#:

using System;
using System.IO.Ports;
using Modbus.Device;

// Configure and open the serial port
SerialPort serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
serialPort.Open();

// Create Modbus RTU master
var modbusMaster = ModbusSerialMaster.CreateRtu(serialPort);

// Read holding registers
ushort startAddress = 0; // Start address of the registers to read
ushort numberOfPoints = 10; // Number of registers to read

// Read the registers and store the values in an array
ushort[] registers = modbusMaster.ReadHoldingRegisters(1, startAddress, numberOfPoints);

// Print the register values
for (int i = 0; i < registers.Length; i++)
{
    Console.WriteLine($"Register {startAddress + i}: {registers[i]}");
}

// Close the serial port
serialPort.Close();

Remember to replace `"COM1"` with the actual serial port on your system and adjust the other parameters according to your Modbus RTU device's configuration.

Please note that this is just a basic example, and you may need to refer to the documentation of the specific library you choose to use for more advanced features or error handling.