C# 测试 modbusTCP 经验积累

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

namespace WindowsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                int port = Convert.ToInt32(portm.Text);
                string host = ipAddress.Text;
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip, port);
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                c.Connect(ipe);
                byte[] obuf = strToToHexByte("00 00 00 00 00 06 01 03 00 00 00 0A");
                c.Send(obuf, obuf.Length, 0);
                byte[] recvBytes = new byte[256];
                c.Receive(recvBytes, recvBytes.Length, 0);
                recent.Text = byteToHexStr(recvBytes);
                c.Close();
            }
            catch (ArgumentNullException ex)
            {
                recent.Text = ex.ToString();
            }
            catch (SocketException ex)
            {
                recent.Text = ex.ToString();
            }

        }

        //16进制转换
        public static string byteToHexStr(byte[] bytes)
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                    returnStr += bytes[i].ToString("X2") + " ";
                }
            }
            return returnStr;
        }

        //字符串转byte
        private static byte[] strToToHexByte(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            button1_Click(sender,e);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }

    }
}