使用C#写一个modbus Rtu服务器，并且实现03和06功能码

你好！以下是一个使用C#编写的Modbus RTU服务器示例，其中包含实现03和06功能码的代码：

using System;
using System.IO.Ports;
using System.Threading;

namespace ModbusRtuServer
{
    class Program
    {
        static SerialPort serialPort;
        static bool isRunning;

        static void Main()
        {
            serialPort = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
            serialPort.Open();

            isRunning = true;
            Thread serverThread = new Thread(ServerThread);
            serverThread.Start();

            Console.WriteLine("Modbus RTU server running. Press any key to stop...");
            Console.ReadKey();

            isRunning = false;
            serverThread.Join();
            serialPort.Close();
        }

        static void ServerThread()
        {
            while (isRunning)
            {
                if (serialPort.BytesToRead >= 4)
                {
                    byte[] buffer = new byte[serialPort.BytesToRead];
                    serialPort.Read(buffer, 0, buffer.Length);

                    // Check if the message is a valid Modbus RTU request
                    if (IsValidRequest(buffer))
                    {
                        byte[] response = ProcessRequest(buffer);
                        serialPort.Write(response, 0, response.Length);
                    }
                }

                Thread.Sleep(10);
            }
        }

        static bool IsValidRequest(byte[] buffer)
        {
            // TODO: Implement Modbus RTU request validation logic
            // You may check the message CRC or other fields here

            return true;
        }

        static byte[] ProcessRequest(byte[] request)
        {
            byte[] response = new byte[8];
            Array.Copy(request, response, 8);

            // Extract function code
            byte functionCode = request[1];

            // Process request based on the function code
            switch (functionCode)
            {
                case 3:
                    // Read Holding Registers
                    // TODO: Implement your code to handle function code 03
                    // Modify the response array accordingly
                    break;

                case 6:
                    // Write Single Register
                    // TODO: Implement your code to handle function code 06
                    // Modify the response array accordingly
                    break;

                default:
                    // Unsupported function code
                    response[2] = (byte)(0x80 | functionCode); // Set the MSB to indicate an error
                    break;
            }

            // TODO: Calculate and set the CRC field of the response

            return response;
        }
    }
}

请注意，此示例仅演示了如何设置Modbus RTU服务器和处理03和06功能码的请求。你需要根据你的实际需求进行进一步的开发和测试。