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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
using Modbus.Device;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private ModbusIpMaster Master;
        private TcpClient tcpClient;
        private ushort startAddress;
        private ushort numOfPoints;
        public Form1()
        {
            InitializeComponent();
        }



        private void Button5_Click(object sender, EventArgs e)
        {
            string ipAddress = conText.Text;
            tcpClient = new TcpClient();
            IAsyncResult asynResult = tcpClient.BeginConnect(ipAddress, 502, null, null);
            asynResult.AsyncWaitHandle.WaitOne(2000, true);
            if (asynResult.IsCompleted && IsOnline())
            {
                Master = ModbusIpMaster.CreateIp(tcpClient);
                conLab.Text = "已连接";
                conLab.ForeColor = System.Drawing.Color.Green;
            }
            else
            {
                conLab.Text = "连接失败";
                conLab.ForeColor = System.Drawing.Color.Red;
            }
        }

        private void ShowData(ushort[] obj)
        {
            string ret = "";
            foreach (var item in obj)
            {
                ret = ret   item   "\r\n";
            }
            retText.Text = ret;
        }
        private void ShowData(bool[] obj)
        {
            string ret = "";
            foreach (var item in obj)
            {
                ret = ret   item   "\r\n";
            }
            retText.Text = ret;
        }

        private void ReadCoilsBtn_Click(object sender, EventArgs e)
        {
            if (!IsOnline())
            {
                conLab.Text = "连接断开";
                conLab.ForeColor = System.Drawing.Color.Red;
                MessageBox.Show("Modbus连接已断开，请重连");
                return;
            }
            startAddress = Convert.ToUInt16(addressText.Text);
            ushort numOfPoints = Convert.ToUInt16(lehText.Text);
            bool[] Coils = Master.ReadCoils(startAddress,
            numOfPoints);
            ShowData(Coils);
        }

        private void ReadHoldBtn_Click(object sender, EventArgs e)
        {
            if (!IsOnline())
            {
                conLab.Text = "连接断开";
                conLab.ForeColor = System.Drawing.Color.Red;
                MessageBox.Show("Modbus连接已断开，请重连");
                return;
            }
            startAddress = Convert.ToUInt16(addressText.Text);
            ushort numOfPoints = Convert.ToUInt16(lehText.Text);
            ushort[] holding_register = Master.ReadHoldingRegisters(startAddress,
            numOfPoints);
            this.ShowData(holding_register);
        }

        private void WriteCoilsBtn_Click(object sender, EventArgs e)
        {
            if (!IsOnline())
            {
                conLab.Text = "连接断开";
                conLab.ForeColor = System.Drawing.Color.Red;
                MessageBox.Show("Modbus连接已断开，请重连");
                return;
            }
            startAddress = Convert.ToUInt16(addressText.Text);
            bool[] values = GetBoolDate();
            Master.WriteMultipleCoils(startAddress, values);
        }

        private void WriteRegistersBtn_Click(object sender, EventArgs e)
        {
            if (!IsOnline())
            {
                conLab.Text = "连接断开";
                conLab.ForeColor = System.Drawing.Color.Red;
                MessageBox.Show("Modbus连接已断开，请重连");
                return;
            }
            startAddress = Convert.ToUInt16(addressText.Text);
            ushort[] values = GetShortDate() ;
            Master.WriteMultipleRegisters(startAddress,values);
        }

        private ushort[] GetShortDate()
        {

            string[] values = valText.Text.Split(',');
            ushort[] values2 = new ushort[values.Length];
            for (int i = 0; i < values.Length; i  )
            {
                if (String.IsNullOrEmpty(values[i]))
                    continue;
                values2[i] = Convert.ToUInt16(values[i]);
            }
            return values2;
        }
        private bool[] GetBoolDate()
        {
            string[] values = valText.Text.Split(',');
            bool[] values2 = new bool[values.Length];
            for (int i = 0; i < values.Length; i  )
            {
                if (String.IsNullOrEmpty(values[i]))
                    continue;
                values2[i] = bool.Parse(values[i]);
            }
            return values2;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (Master != null)
                Master.Dispose();
        }

        private  Boolean IsOnline()
        {
            return !((tcpClient.Client.Poll(1000, SelectMode.SelectRead)
                && (tcpClient.Client.Available == 0)) || !tcpClient.Client.Connected);

        }
    }
}