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继C# Modbus TCP/IP学习记录后，尝试串口通信。

操作步骤：

1.使用Visual Studio安装Nuget包NModbus.Serial。

2.使用Modbus Slave应用程序，工具栏Connection项，单击Connect，弹窗Connection Setup，修改Connection下拉框为Serial Port，下列配置按实际需求修改：

（端口此时使用的虚拟端口）

3.回到Visual Studio的控制台应用程序，输入以下代码，代码含有读写方法，按需修改:

using System;
using System.IO.Ports;
using NModbus;
using NModbus.Serial;class ModbusRtuMaster
{static void Main(string[] args){try{// 配置串口参数string portName = "COM31"; //串口号int baudRate = 9600;// 波特率Parity parity = Parity.None; // 校验位int dataBits = 8;// 数据位StopBits stopBits = StopBits.One; // 停止位// 初始化串口using (SerialPort serialPort = new SerialPort(portName, baudRate, parity, dataBits, stopBits)){serialPort.Open();Console.WriteLine($"Modbus RTU 主站已启动，连接到 {portName}...");// 创建 Modbus RTU 主站var factory = new ModbusFactory();IModbusSerialMaster master = factory.CreateRtuMaster(new SerialPortAdapter(serialPort));// 从站地址byte slaveId = 1;// 测试读取保持寄存器ushort startAddress = 0; // 寄存器地址ushort numRegisters = 10; // 读取 10 个寄存器ushort[] readValues = ReadHoldingRegisters(master, slaveId, startAddress, numRegisters);Console.WriteLine("读取到的寄存器数据：");for (int i = 0; i < readValues.Length; i++){Console.WriteLine($"寄存器 {startAddress + i}: {readValues[i]}");}// 测试写入单个寄存器ushort writeAddress = 0; // 写入的寄存器地址ushort writeValue = 21; // 要写入的值WriteSingleRegister(master, slaveId, writeAddress, writeValue);Console.WriteLine($"已写入寄存器 {writeAddress}: {writeValue}");// 再次读取以验证写入是否成功ushort[] updatedValues = ReadHoldingRegisters(master, slaveId, startAddress, numRegisters);Console.WriteLine("更新后的寄存器数据：");for (int i = 0; i < updatedValues.Length; i++){Console.WriteLine($"寄存器 {startAddress + i}: {updatedValues[i]}");}}}catch (Exception ex){Console.WriteLine($"发生错误: {ex.Message}");}Console.ReadLine();}/// <summary>/// 读取保持寄存器/// </summary>public static ushort[] ReadHoldingRegisters(IModbusSerialMaster master, byte slaveId, ushort startAddress, ushort numRegisters){return master.ReadHoldingRegisters(slaveId, startAddress, numRegisters);}/// <summary>/// 写入单个保持寄存器/// </summary>public static void WriteSingleRegister(IModbusSerialMaster master, byte slaveId, ushort address, ushort value){master.WriteSingleRegister(slaveId, address, value);}
}

4.运行结果：