這裡是範例程式碼，想知道原理的請閱讀：[三菱PLC] 學習筆記 指令 及 透過RS232(USB介面)監控 PLC
public partial class MainForm : Form
{
System.IO.Ports.SerialPort serialport = new System.IO.Ports.SerialPort();//宣告連接埠
Boolean light = false, serialportopen = false;
public MainForm()
{
InitializeComponent();
foreach(string com in System.IO.Ports.SerialPort.GetPortNames())//取得所有可用的連接埠
{
cbPortName.Items.Add(com);
}
if (cbPortName.Items.Count > 0)
cbPortName.SelectedIndex = 0;
cbCmd.Items.Add("0-讀取");
cbCmd.Items.Add("1-寫入");
cbCmd.Items.Add("7-強制ON");
cbCmd.Items.Add("8-強制OFF");
if(cbCmd.Items.Count>1)
cbCmd.SelectedIndex=0;
}
void Button1Click(object sender, EventArgs e)
{
if (serialportopen == false && !serialport.IsOpen)
{
try
{
//設定連接埠
serialport.PortName = cbPortName.Text;//連線埠
serialport.BaudRate = 9600;//鮑率
serialport.DataBits = 7;//數據位元
serialport.Parity = System.IO.Ports.Parity.Even;//偶同位
serialport.StopBits = System.IO.Ports.StopBits.One;//停止位元
serialport.Encoding = Encoding.Default;//傳輸編碼方式
serialport.Open();
serialportopen = true;
button2.Enabled = true;
txtSTX.Enabled = true;
if (this.backgroundWorker1.IsBusy != true)
{
this.backgroundWorker1.WorkerReportsProgress = true;
this.backgroundWorker1.RunWorkerAsync();
}
button1.Text = "中斷";
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
else if (serialportopen == true && serialport.IsOpen)
{
try
{
serialport.Close();
if (!serialport.IsOpen)
{
serialportopen = false;
button2.Enabled = false;
txtSTX.Enabled = false;
this.backgroundWorker1.WorkerReportsProgress = false;
this.backgroundWorker1.CancelAsync();
this.backgroundWorker1.Dispose();
label3.ForeColor = Color.Red;
button1.Text = "連線";
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
private void Button2Click(object sender, EventArgs e)
{
try
{
string str = "";
//STX Cmd Addrs Bytes Data ETX SUM
//str = (Char)2 + "70008" + (Char)3 + "02";//M0
//str = (Char)2 + "70108" + (Char)3 + "03";//M1
//str = (Char)2 + "70208" + (Char)3 + "04";//M2
//str = (Char)2 + "70308" + (Char)3 + "05";//M3
str = (Char)2 + txtCmd.Text + txtAddrs.Text + txtBytes.Text + txtData.Text + (Char)3 + txtSum.Text;
serialport.Write(str);
AddText(MsgType.Error, "傳送：" + str + "\r\n");
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
{
if(e.KeyChar==(Char)13)
{
Button2Click(sender, e);
}
}
private void BackgroundWorker1DoWork(object sender, DoWorkEventArgs e)
{
for (; ; )
{
if (backgroundWorker1.CancellationPending == true)
{
e.Cancel = true;
break;
}
else
{
try
{
backgroundWorker1.ReportProgress(0);
System.Threading.Thread.Sleep(1000);
}
catch (Exception)
{
e.Cancel = true;
break;
}
}
}
}
private void BackgroundWorker1ProgressChanged(object sender, ProgressChangedEventArgs e)
{
try
{
if (serialport.BytesToRead != 0)
{
label2.Text = "緩衝區：" + serialport.BytesToRead.ToString();
AddText(MsgType.System, "接收：" + serialport.ReadExisting() + "\r\n");
serialport.DiscardInBuffer();
}
}
catch(Exception)
{}
}
private void AddText(MsgType msgtype, string msg)
{
richTextBox1.Invoke(new EventHandler(delegate
{
richTextBox1.SelectedText = string.Empty;
richTextBox1.SelectionFont = new Font(richTextBox1.SelectionFont, FontStyle.Bold);
richTextBox1.SelectionColor = MsgTypeColor[(int)msgtype];
richTextBox1.AppendText(msg);
richTextBox1.ScrollToCaret();
}));
}
//FX2N CheckSum，取 CMD、ADDR、DATA、ETX 各字元的 ASCII碼 16進位表示法 加總，然後取最後兩個字元。
private string CheckSum()
{
//宣告：int為整數、string為字符串
int sum = 0;
string checkstring = "";
string checksum = "";
//通訊格式中的英文字符必須為大寫(a~f)，故先行將text所輸入之傳送數據，經由程序自動轉換為大寫字母，然後加上結束碼etx：chr(3)，形成一字符串checkstring
checkstring = (String)txtCmd.Text + txtAddrs.Text + txtBytes.Text + txtData.Text + (Char)3;
// for屬於重複結構中之計數循環，指令pc在一定的次數內，重複的執行某一敘述區段，亦即取出checkstring字符串中每一個字符，並累加每一個字符的ascii碼，而得出一整數sum。
for (int i = 0; i < checkstring.Length; i++) {
sum = sum + Convert.ToInt32(checkstring[i]);
}
//將10進制整數sum轉換為16進制，並取其右邊二位數，即為所求檢查碼。
checksum = String.Format("{0:X}", sum);
checksum.PadLeft(2,'0');
checksum = checksum.Substring(checksum.Length - 2, 2);
return checksum;
}
void Button3Click(object sender, EventArgs e)
{
string sum = CheckSum();
txtSum.Text = sum;
}
void CbCmdSelectedIndexChanged(object sender, EventArgs e)
{
string cmd = cbCmd.Text.Split('-')[0];
txtCmd.Text = cmd;
}
void SendStr(string str)
{
try
{
//STX Cmd Addrs Bytes Data ETX SUM
//str = (Char)2 + "70008" + (Char)3 + "02";//M0
//str = (Char)2 + "70108" + (Char)3 + "03";//M1
//str = (Char)2 + "70208" + (Char)3 + "04";//M2
//str = (Char)2 + "70308" + (Char)3 + "05";//M3
serialport.Write(str);
AddText(MsgType.Error, "傳送：" + str + "\r\n");
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
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