C# NModbus TCP 主从站通信样例

之前做过 C# NModbus4 TCP 主从站通信样例的记录

连接地址：https://blog.csdn.net/iml6yu/article/details/127748518

前提

补充完成对NModbus 的简要使用的记录，因为NModbus4不更新，也不支持core,所以补充一个NModbus 的使用。

效果图

见 https://blog.csdn.net/iml6yu/article/details/127748518

NModbus

Nuget引用

偷懒，沿用了之前的4.8的项目继续做的。

 <package id="NModbus" version="3.0.72" targetFramework="net48" />
1

NModbus中常用方法

Master 客户端代码

using NModbus;
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using static System.Windows.Forms.AxHost;

/*
 * 注释：
 * 当使用Modbus-TCP时，往往使用Slave作为服务端
 * 所以NModbus-TCP中主站使用的时Slave对象
 */
namespace NModBus4.Master
{
    public partial class Form1 : Form
    {
        private TcpListener listener;
        private IModbusSlave slave;
        private IModbusFactory factory;
        private IModbusSlaveNetwork network;
        private CancellationTokenSource tokenSource;

        public Form1()
        {
            InitializeComponent();
            factory = new ModbusFactory();
        }

        /// 

        /// 启动
        /// 
        /// 
        /// 
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {

                listener = new TcpListener(IPAddress.Parse(textBox1.Text), int.Parse(textBox2.Text));
                //Task.Run(() =>
                //{
                listener.Start();
                network = factory.CreateSlaveNetwork(listener);

                /*
                 * 通过源码分析可以得到，如果不指定Store，默认会给一个DefaultSlaveDataStore
                 *     public IModbusSlave CreateSlave(byte unitId, ISlaveDataStore dataStore = null)
                 *       {
                 *           if (dataStore == null)
                 *               dataStore = new DefaultSlaveDataStore();
                 *
                 *           return new ModbusSlave(unitId, dataStore, GetAllFunctionServices());
                 *       }
                 */
                slave = factory.CreateSlave(1);
                network.AddSlave(slave);
                network.ListenAsync();
                //}); 
                button1.Enabled = false;
                tokenSource = new CancellationTokenSource();
                //轮询读取线圈数据
                ReadColDatas();
            }
            catch (Exception)
            {

                throw;
            }

        }

        bool[] values =new bool[10];
        private void ReadColDatas()
        {
            Task.Run(() =>
            {
                while (!tokenSource.IsCancellationRequested)
                {
                    Task.Delay(TimeSpan.FromSeconds(1)).Wait();
                    var current  = slave.DataStore.CoilDiscretes.ReadPoints(0, 10);
                    if (string.Join("", current) != string.Join("", values))
                    {
                        values = current;
                        this.Invoke(new Action(() => {
                            richTextBox1.AppendText("数据发生变化：\r\n" + string.Join(",", values) + "\r\n");
                        }));
                    }
                }
            });
        }

        private void button2_Click(object sender, EventArgs e)
        {
            network.Dispose();
            button1.Enabled = true;
        }

        /// 

        /// 写数据
        /// 
        /// 
        /// 
        private void button3_Click(object sender, EventArgs e)
        {
            //CoilDiscretes表示一个Bit，也就是一个bool类型
            slave.DataStore.CoilDiscretes.WritePoints((ushort)cliAddress.Value, new bool[] { cliValue.Value == 1 ? true : false });
            //HoldingRegisters表示一个无符号的16位整数（2的16次幂：0-65535）
            slave.DataStore.HoldingRegisters.WritePoints((ushort)holAddress.Value, new ushort[] { (ushort)holValue.Value });
        }
    }
}

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从站客户端代码

using NModbus;
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using static System.Windows.Forms.AxHost;

namespace NModBus4.从站
{
    public partial class Form1 : Form
    {
        private TcpClient client;
        private IModbusMaster master;
        private IModbusFactory factory; 
        public CancellationTokenSource tokenSource= new CancellationTokenSource();  
        public Form1()
        {
            InitializeComponent();
            factory = new ModbusFactory();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            client = new TcpClient();
            client.Connect(IPAddress.Parse(textBox1.Text.Trim()),  int.Parse(textBox2.Text));
            master = factory.CreateMaster(client) ; 
        }

        private void button2_Click(object sender, EventArgs e)
        {
            tokenSource.Cancel();
            master.Dispose();
        }

        /// 

        /// 写线圈
        /// 
        /// 
        /// 
        private void button3_Click(object sender, EventArgs e)
        { 
            master.WriteSingleCoil(1,(ushort)cliAddress.Value, cliValue.Value==1?true:false);
        }

        /// 

        /// 定时读取数据
        /// 
        /// 
        /// 
        private void button4_Click(object sender, EventArgs e)
        {
            ReadColDatas(); 
        }

        bool[] values = new bool[10];
        private void ReadColDatas()
        {
            Task.Run(() =>
            {
                while (!tokenSource.IsCancellationRequested)
                {
                    Task.Delay(TimeSpan.FromSeconds(1)).Wait();
                    var current = master.ReadCoils(1, 0, 10);
                    if (string.Join("", current) != string.Join("", values))
                    {
                        values = current;
                        this.Invoke(new Action(() => {
                            richTextBox1.AppendText("数据发生变化：\r\n" + string.Join(",", values) + "\r\n");
                        }));
                    }
                }
            });
        }

    }
}

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demo 下载

https://download.csdn.net/download/iml6yu/87060108

引用

https://www.cnblogs.com/pandefu/p/10824331.html
https://nmodbus.github.io/api/NModbus.Data.html
https://www.cnblogs.com/Samberger/p/13039429.html (读写字符串，浮点型数据）
https://blog.csdn.net/helldoger/article/details/122184111