1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Threading.Tasks;
  9 using System.Windows.Forms;
 10 using System.IO.Ports;
 11 
 12 
 13 namespace 三菱PLC
 14 {
 15     public partial class Form1 : Form
 16     {
 17         public Form1()
 18         {
 19             InitializeComponent();
 20 
 21         }
 22 
 23         private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
 24         {
 25  //串口初始化
 26             com = new SerialPort("com5", 9600, Parity.Even, 7, StopBits.One);
 27 
 28             if (com.IsOpen)
 29             { com.Close(); }
 30             com.Open();
 31 
 32         }
 33 
 34         private void textBox1_TextChanged(object sender, EventArgs e)
 35         {
 36 
 37         }
 38 
 39 
 40 // ASCII转字符
 41 
 42         
 43         
 44             public static string Chr(int asciiCode)
 45             {
 46                 if (asciiCode >= 0 && asciiCode <= 255)
 47                 {
 48                     System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
 49                     byte[] byteArray = new byte[] { (byte)asciiCode };
 50                     string strCharacter = asciiEncoding.GetString(byteArray);
 51                     return (strCharacter);
 52                 }
 53 
 54                 else
 55                 {
 56                     throw new Exception("ASCII Code is not valid");//ASCII 缺失
 57 
 58                 }
 59             }
 60     
 61  //字符转ASCII
 62    
 63 
 64         public static int Asc(string character)
 65   {
 66             if (character.Length == 1)
 67             {
 68 
 69                    System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
 70                    int intAsciiCode = (int)asciiEncoding.GetBytes(character)[0];
 71                    return (intAsciiCode);
 72 
 73             }
 74             else
 75             {
 76 
 77                  throw new Exception("character is not valid");
 78                 
 79             }
 80   
 81         
 82   }
 83 
 84 
 85 
 86 
 87 
 88   // 写入串口的命令字符的和校验
 89        
 90         public string SumCheck(string data)
 91         {
 92             int sum = 0;
 93 
 94             for (int i = 0; i < data.Length; i++)
 95             {
 96                 sum += Asc(data.Substring(i, 1));
 97 
 98                // sum += Convert.ToInt16(data.Substring(i, 1));
 99             }
100             string res = sum.ToString("X");
101             res = res.Substring(res.Length - 2, 2);
102             return res;
103         }
104  
105     
106     
107       private void btnWrite_Click(object sender, EventArgs e)
108   {
109             string[] write = new string[] { "2", "2" };//将准备写入PLC的值
110             // 将要写入PLC的值转化为16进制数，补齐2个字节，注意高低字节需要交换
111             string sWriteData = "";
112             for (int i = 0; i < write.Length; i++)
113             {
114 
115                 int val = Convert.ToInt32(write[i].Length > 0 ? write[i] : "0");
116                 string s = val.ToString("X");
117                 while (s.Length < 4)
118                 {
119 
120                     s = "0" + s;
121                 }
122                 sWriteData += s.Substring(2, 2) + s.Substring(0, 2);
123 
124             }
125 
126             MessageBox.Show(sWriteData);
127             //写入命令，1表示写入，1194表示D202这个地址的16进制，04表示D202，D203为4个BYTE，
128             //1194=(202*2)+4096的16进制数，至于用它表示D202的起始位置，三菱故意要这么麻烦了。
129             
130             sWriteData = "1119404" + sWriteData + Chr(3);
131             // chr(2)和chr(3)是构成命令的标识符，然后加上校验和，命令组织完成。
132 
133             sWriteData = Chr(2) + sWriteData + SumCheck(sWriteData);
134             MessageBox.Show(sWriteData);
135             //写入串口
136             com.Write(sWriteData);
137             //byte[]data = Encoding.ASCII.GetBytes(sWriteData);
138             //com.Write(data,0,data.Length);
139 
140         }
141 
142     }
143       
144     }
145 
146    
147    
148