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Author: LineYK

ModBusSlave.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.IO.Ports" Version="8.0.0" />
+  </ItemGroup>
+
+</Project>

ModBusSlave.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35327.3
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ModBusSlave", "ModBusSlave.csproj", "{27410EB1-8C87-4874-B322-E1C904FF0838}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{27410EB1-8C87-4874-B322-E1C904FF0838}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{27410EB1-8C87-4874-B322-E1C904FF0838}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{27410EB1-8C87-4874-B322-E1C904FF0838}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{27410EB1-8C87-4874-B322-E1C904FF0838}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {37A3EEB7-5827-42E1-A620-D48E980CBC82}
+	EndGlobalSection
+EndGlobal

ModbusRTU.cs

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+namespace ModBusSlave
+{
+    internal class ModbusRTU
+    {
+        private byte[] _frame;
+        private byte _slaveAddr;
+        private byte _functionCode;
+        private byte[] _data;
+        private byte[] _crc;
+
+        public ModbusRTU(byte slaveAddr, byte functionCode, byte[] data)
+        {
+            _slaveAddr = slaveAddr;
+            _functionCode = functionCode;
+            _data = data;
+        }
+
+        public ModbusRTU(byte[] frame)
+        {
+            _frame = frame;
+            _slaveAddr = frame[0];
+            _functionCode = frame[1];
+            _data = new byte[frame.Length - 5];
+            Array.Copy(frame, 2, _data, 0, _data.Length);
+            _crc = new byte[2];
+            Array.Copy(frame, frame.Length - 2, _crc, 0, 2);
+        }
+
+        public byte[] GetFrame()
+        {
+            byte[] frame = new byte[1 + 1 + _data.Length + 2]; // SlaveAddr + FunctionCode + Data + CRC
+
+            frame[0] = _slaveAddr;
+            frame[1] = _functionCode;
+            Array.Copy(_data, 0, frame, 2, _data.Length);
+
+            ushort crc = CalcCRC(frame, 0, frame.Length - 2);
+            frame[frame.Length - 2] = (byte)(crc & 0xFF);
+            frame[frame.Length - 1] = (byte)(crc >> 8);
+
+            return frame;
+        }
+
+        private static ushort CalcCRC(byte[] data, int offset, int count)
+        {
+            ushort crc = 0xFFFF;
+
+            for (int i = offset; i < offset + count; i++)
+            {
+                crc ^= data[i];
+
+                for (int j = 0; j < 8; j++)
+                {
+                    if ((crc & 0x0001) == 1)
+                    {
+                        crc >>= 1;
+                        crc ^= 0xA001;
+                    }
+                    else
+                    {
+                        crc >>= 1;
+                    }
+                }
+            }
+
+            return crc;
+        }
+
+    }
+}

Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using ModBusSlave;
+
+SerialPortConnector serialPortConnector = new SerialPortConnector();
+serialPortConnector.GetPortNames();
+string portName = Console.ReadLine();
+try
+{
+    serialPortConnector.Open(portName);
+}
+catch (Exception e)
+{
+    Console.WriteLine("잘못된 포트");
+    Console.Error.WriteLine(e.Message);
+    return;
+}
+
+Console.WriteLine("연결되었습니다.");
+
+
+
+
+
+
+
+
+

SerialPortConnector.cs

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+using System.IO.Ports;
+
+namespace ModBusSlave
+{
+    public class SerialPortConnector
+    {
+        SerialPort seriallPort = new SerialPort();
+
+        public SerialPortConnector()
+        {
+            seriallPort.BaudRate = 115200;
+            seriallPort.Parity = Parity.None;
+            seriallPort.DataBits = 8;
+            seriallPort.StopBits = StopBits.One;
+            seriallPort.Handshake = Handshake.None;
+            seriallPort.ReadTimeout = 500;
+            seriallPort.WriteTimeout = 500;
+        }
+
+        public void Open(string portName)
+        {
+            seriallPort.PortName = portName;
+            seriallPort.Open();
+        }
+
+        public void Close()
+        {
+            seriallPort.Close();
+        }
+
+        public void Write(byte[] data)
+        {
+            seriallPort.Write(data, 0, data.Length);
+        }
+
+        public byte[] Read()
+        {
+            byte[] buffer = new byte[seriallPort.BytesToRead];
+            seriallPort.Read(buffer, 0, buffer.Length);
+            return buffer;
+        }
+
+        public bool IsOpen()
+        {
+            return seriallPort.IsOpen;
+        }
+
+        public string[] GetPortNames()
+        {
+            string[] ports = SerialPort.GetPortNames();
+            Console.WriteLine("시리얼 포트 선택하기: ");
+            ports.ToList().ForEach(port => Console.WriteLine($"{port} "));
+            return ports;
+        }
+
+    }
+}