c#使用ModuleBus方式读取线圈的值

本文来源：C# ModBus Tcp客户端读取数据 完整Demo - 陈彦斌 - 博客园，感谢作者。看了作者的文章后，为了加深影响，做一个更加精细的说明。

1.建立一个程序，引用HslCommunication.dll和Newtonsoft.Json.dll

2.界面

3.界面代码

namespace ModbusDemo
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.button5 = new System.Windows.Forms.Button();
            this.button6 = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.button3 = new System.Windows.Forms.Button();
            this.label3 = new System.Windows.Forms.Label();
            this.txtIp = new System.Windows.Forms.TextBox();
            this.label4 = new System.Windows.Forms.Label();
            this.txtPort = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // button5
            // 
            this.button5.Location = new System.Drawing.Point(133, 318);
            this.button5.Name = "button5";
            this.button5.Size = new System.Drawing.Size(164, 82);
            this.button5.TabIndex = 4;
            this.button5.Text = "开启连接";
            this.button5.UseVisualStyleBackColor = true;
            this.button5.Click += new System.EventHandler(this.Button5_Click);
            // 
            // button6
            // 
            this.button6.Location = new System.Drawing.Point(355, 318);
            this.button6.Name = "button6";
            this.button6.Size = new System.Drawing.Size(172, 82);
            this.button6.TabIndex = 5;
            this.button6.Text = "关闭连接";
            this.button6.UseVisualStyleBackColor = true;
            this.button6.Click += new System.EventHandler(this.Button6_Click);
            // 
            // textBox1
            // 
            this.textBox1.Enabled = false;
            this.textBox1.Location = new System.Drawing.Point(222, 39);
            this.textBox1.Multiline = true;
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(272, 58);
            this.textBox1.TabIndex = 6;
            // 
            // label1
            // 
            this.label1.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label1.Location = new System.Drawing.Point(116, 52);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(100, 45);
            this.label1.TabIndex = 7;
            this.label1.Text = "返回值";
            // 
            // label2
            // 
            this.label2.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label2.Location = new System.Drawing.Point(129, 153);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(72, 45);
            this.label2.TabIndex = 8;
            this.label2.Text = "地址";
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(222, 140);
            this.textBox2.Multiline = true;
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(272, 58);
            this.textBox2.TabIndex = 9;
            // 
            // button3
            // 
            this.button3.Location = new System.Drawing.Point(512, 148);
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size(108, 50);
            this.button3.TabIndex = 10;
            this.button3.Text = "监听";
            this.button3.UseVisualStyleBackColor = true;
            this.button3.Click += new System.EventHandler(this.Button3_Click);
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label3.Location = new System.Drawing.Point(91, 263);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(31, 20);
            this.label3.TabIndex = 11;
            this.label3.Text = "IP";
            // 
            // txtIp
            // 
            this.txtIp.Location = new System.Drawing.Point(133, 255);
            this.txtIp.Multiline = true;
            this.txtIp.Name = "txtIp";
            this.txtIp.Size = new System.Drawing.Size(164, 35);
            this.txtIp.TabIndex = 12;
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label4.Location = new System.Drawing.Point(338, 263);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(51, 20);
            this.label4.TabIndex = 13;
            this.label4.Text = "端口";
            // 
            // txtPort
            // 
            this.txtPort.Location = new System.Drawing.Point(418, 255);
            this.txtPort.Multiline = true;
            this.txtPort.Name = "txtPort";
            this.txtPort.Size = new System.Drawing.Size(109, 35);
            this.txtPort.TabIndex = 14;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(724, 477);
            this.Controls.Add(this.txtPort);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.txtIp);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.button6);
            this.Controls.Add(this.button5);
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "ModBus Tcp客户端";
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion
        private System.Windows.Forms.Button button5;
        private System.Windows.Forms.Button button6;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Button button3;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox txtIp;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.TextBox txtPort;
    }
}

4.源代码

using System;
using System.Windows.Forms;
using HslCommunication.ModBus;
using HslCommunication;

namespace ModbusDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 初始化类
        /// </summary>
        private ModbusTcpNet busTcpClient =null;
        /// <summary>
        /// 监听状态
        /// </summary>
        private bool IsEnable = false;
        private void Form1_Load(object sender, EventArgs e)
        {
            txtPort.Text = "502";
            txtIp.Text = "172.30.16.220";
            textBox2.Text = "00141";
        }
        /// <summary>
        /// 开启服务
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Button5_Click(object sender, EventArgs e)
        {
            try
            {
                if (IsEnable)
                {
                    MessageBox.Show("请勿重复建立连接!");
                    return;
                }
                string ip = txtIp.Text.Trim();
                int port = Convert.ToInt32(txtPort.Text);
                if (ip==null || ip=="")
                {
                    MessageBox.Show("ip不能为空!");
                    return;
                }
                busTcpClient = new ModbusTcpNet(ip, port, 0x01);
                OperateResult res = busTcpClient.ConnectServer();
                if (res.IsSuccess==true) //接收状态返回值
                {
                    IsEnable = true;
                    MessageBox.Show("开启连接成功");
                }
                else
                {
                    MessageBox.Show("开启连接失败");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("开启连接失败!", ex.Message.ToString());
            }
        }        
        private void Button6_Click(object sender, EventArgs e)
        {
            try
            {
                if (!IsEnable)
                {
                    MessageBox.Show("尚未建立连接!");
                    return;
                }
                busTcpClient.ConnectClose();
                IsEnable = false;
                MessageBox.Show("关闭连接成功！");
            }
            catch (Exception ex)
            {
                MessageBox.Show("关闭连接失败!", ex.Message.ToString());
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.Exit();
        }

        private void Button3_Click(object sender, EventArgs e)
        {
            try
            {
                if (!IsEnable)
                {
                    MessageBox.Show("尚未建立连接!");
                    return;
                }
                if (busTcpClient == null)
                {
                    MessageBox.Show("尚未初始化对象!");
                    return;
                }
                string txt = textBox2.Text.Trim();
                if (txt=="")
                {
                    MessageBox.Show("地址不能为空!");
                    return;
                }
                bool coil100 = busTcpClient.ReadCoil(txt).Content;   // 读取线圈100的通断
                textBox1.Text = "";
                MessageBox.Show("监听成功!");
                textBox1.Text = coil100 == true ? "true" : "false";
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
        }
    }
}

5.对源码进行加注释和说明

在之前的文章中《modbus调试工具的使用》，并且根据IP进行模拟通信这个方法配置完成后，这是前提。

5.1打开Modbus Slave,按F8进入这个界面，函数选择线圈，数量选择20，点击ok

5.2 同理也打开Modbus Poll，按F8进入这个界面，函数选择线圈，数量选择20，点击ok

 5.3这时他们可以进行通信了，修改其中一个参数，另一个软件也会进行变化

 5.4源代码从上到下，注释说明

6.所有注释说明过的代码 

using System;
using System.Windows.Forms;
using HslCommunication.ModBus;
using HslCommunication;

namespace ModbusDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 初始化类
        /// </summary>
        private ModbusTcpNet busTcpClient = null;
        /// <summary>
        /// 监听状态
        /// </summary>
        private bool IsEnable = false;
        private void Form1_Load(object sender, EventArgs e)
        {
            txtPort.Text = "502";//这里是端口号
            txtIp.Text = "127.0.0.1";//这里是本机的IP地址，原配置是172.30.16.220，修改成127.0.0.1
            //这里的值，先看第二列，00000，第一列是别名，就和sql语句中的as是一样的。
            //再看行0,1,2,3,4,5,6,7,8,9
            //列值和行值组合在一起，就是我们要的地址。例如00001  00002  00003  00004  以此类推，第一列到00009，第二列到00019。
            //所以，这里我们要读谁的值，或者写入谁的值，就写入谁的地址。
            textBox2.Text = "00002";
        }
        /// <summary>
        /// 开启服务
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Button5_Click(object sender, EventArgs e)
        {
            try
            {
                if (IsEnable)
                {
                    MessageBox.Show("请勿重复建立连接!");
                    return;
                }
                string ip = txtIp.Text.Trim();
                int port = Convert.ToInt32(txtPort.Text);
                if (ip == null || ip == "")
                {
                    MessageBox.Show("ip不能为空!");
                    return;
                }
                busTcpClient = new ModbusTcpNet(ip, port, 0x01);
                OperateResult res = busTcpClient.ConnectServer();
                if (res.IsSuccess == true) //接收状态返回值
                {
                    IsEnable = true;
                    MessageBox.Show("开启连接成功");
                }
                else
                {
                    MessageBox.Show("开启连接失败");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("开启连接失败!", ex.Message.ToString());
            }
        }
        private void Button6_Click(object sender, EventArgs e)
        {
            try
            {
                if (!IsEnable)
                {
                    MessageBox.Show("尚未建立连接!");
                    return;
                }
                busTcpClient.ConnectClose();
                IsEnable = false;
                MessageBox.Show("关闭连接成功！");
            }
            catch (Exception ex)
            {
                MessageBox.Show("关闭连接失败!", ex.Message.ToString());
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.Exit();
        }

        private void Button3_Click(object sender, EventArgs e)
        {
            try
            {
                if (!IsEnable)
                {
                    MessageBox.Show("尚未建立连接!");
                    return;
                }
                if (busTcpClient == null)
                {
                    MessageBox.Show("尚未初始化对象!");
                    return;
                }
                string txt = textBox2.Text.Trim();
                if (txt == "")
                {
                    MessageBox.Show("地址不能为空!");
                    return;
                }
                bool coil100 = busTcpClient.ReadCoil(txt).Content;   // 这里写谁的地址，读的就是谁的值
                textBox1.Text = "";
                MessageBox.Show("监听成功!");
                textBox1.Text = coil100 == true ? "true" : "false";



                // 读取操作，以下txt写谁，读取的就是谁的值
                bool coil1001 = busTcpClient.ReadCoil(txt).Content;   // 读取线圈100的通断
                short short100 = busTcpClient.ReadInt16(txt).Content; // 读取寄存器100的short值
                ushort ushort100 = busTcpClient.ReadUInt16(txt).Content; // 读取寄存器100的ushort值
                int int100 = busTcpClient.ReadInt32(txt).Content;      // 读取寄存器100-101的int值
                uint uint100 = busTcpClient.ReadUInt32(txt).Content;   // 读取寄存器100-101的uint值
                float float100 = busTcpClient.ReadFloat(txt).Content; // 读取寄存器100-101的float值
                long long100 = busTcpClient.ReadInt64(txt).Content;    // 读取寄存器100-103的long值
                ulong ulong100 = busTcpClient.ReadUInt64(txt).Content; // 读取寄存器100-103的ulong值
                string str100 = busTcpClient.ReadString(txt, 5).Content;// 读取100到104共10个字符的字符串


                // 写入操作，以下txt写谁，就是写入谁的值
                busTcpClient.WriteCoil(txt, true);// 写入线圈100为通
                busTcpClient.Write(txt, (short)12345);// 写入寄存器100为12345
                busTcpClient.Write(txt, (ushort)45678);// 写入寄存器100为45678
                busTcpClient.Write(txt, 123456789);// 写入寄存器100-101为123456789
                busTcpClient.Write(txt, (uint)123456778);// 写入寄存器100-101为123456778
                busTcpClient.Write(txt, 123.456);// 写入寄存器100-101为123.456
                busTcpClient.Write(txt, 12312312312414L);//写入寄存器100-103为一个大数据
                busTcpClient.Write(txt, 12634534534543656UL);// 写入寄存器100-103为一个大数据
                busTcpClient.Write(txt, 123.456d);// 写入寄存器100-103为一个双精度的数据
                busTcpClient.Write(txt, "K123456789");

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
        }
    }
}

7. 效果。最后我们进行读取和写入的验证

读取

读取00002地址的值，成功

写入

写入00001的值，还未写入的时候是0 

 写入后，0变成1