网上下的 c# 运用serialport与PLC串口通讯程序，小白看不太懂下的程序，求大神帮忙分析下,主要想知道程序中的tebox1、textbox4、textbox5、textbox6、textbox7分别对应图中哪个空，对应的空应填写什么，例如想读取三菱F3X系列PLC D200的数据，初始地址填200？那设备地址和长度填啥？
界面如下：
主要程序如下：
private void btn_open_Click(object sender, EventArgs e)
{
int nSelect;
btn_open.Enabled = false;
Object selectedItem = cbxCOMPort.SelectedItem;
sp.PortName = selectedItem.ToString();//串口
selectedItem = cbxBaudRate.SelectedItem;
sp.BaudRate = int.Parse(selectedItem.ToString());//波特率
nSelect = cbxDataBits.SelectedIndex;//数据位
switch (nSelect)
{
case 0:
sp.DataBits = 8;
break;
case 1:
sp.DataBits = 7;
break;
case 2:
sp.DataBits = 6;
break;
case 3:
sp.DataBits = 5;
break;
}
nSelect = cbxParity.SelectedIndex;
switch (nSelect)
{
case 0:
sp.Parity = Parity.None;
break;
case 1:
sp.Parity = Parity.Odd;
break;
case 2:
sp.Parity = Parity.Even;
break;
case 3:
sp.Parity = Parity.Mark;
break;
case 4:
sp.Parity = Parity.Space;
break;
}
nSelect = cbxStopBits.SelectedIndex;
switch (nSelect)
{
case 0:
sp.StopBits = StopBits.None;
break;
case 1:
sp.StopBits = StopBits.One;
break;
case 2:
sp.StopBits = StopBits.OnePointFive;
break;
case 3:
sp.StopBits = StopBits.Two;
break;
}
sp.Open();
btn_close.Enabled = true;
}
private void btn_send_Click(object sender, EventArgs e)
{
textBox1.Text = "";
int n = 6;
byte[] buf = new byte[n];
string ee = textBox4.Text;
buf[0] = Convert.ToByte(ee);
if (comboBox1.Text == "3X")
{
buf[1] = Convert.ToByte(3);
}
else
{
buf[1] = Convert.ToByte(4);
}
if (int.Parse(textBox5.Text) <= 255)
{
buf[2] = Convert.ToByte(0);
buf[3] = Convert.ToByte(int.Parse(textBox5.Text));
}
else
{
if (Convert.ToString(int.Parse(textBox5.Text), 16).Length < 4)
{
int b = Convert.ToInt32(Convert.ToString(int.Parse(textBox5.Text), 16).Substring(0, 1), 16);
buf[2] = Convert.ToByte(b);
int c = Convert.ToInt32(Convert.ToString(int.Parse(textBox5.Text), 16).Substring(1, 2), 16);
buf[3] = Convert.ToByte(c);
}
else
{
int b = Convert.ToInt32(Convert.ToString(int.Parse(textBox5.Text), 16).Substring(0, 2), 16);
buf[2] = Convert.ToByte(b);
int c = Convert.ToInt32(Convert.ToString(int.Parse(textBox5.Text), 16).Substring(2, 2), 16);
buf[3] = Convert.ToByte(c);
}
}
if (int.Parse(textBox6.Text) <= 255)
{
buf[4] = Convert.ToByte(0);
buf[5] = Convert.ToByte(int.Parse(textBox6.Text));
}
else
{
if (Convert.ToString(int.Parse(textBox6.Text), 16).Length < 4)
{
int d = Convert.ToInt32(Convert.ToString(int.Parse(textBox6.Text), 16).Substring(0, 1), 16);
buf[4] = Convert.ToByte(d);
int f = Convert.ToInt32(Convert.ToString(int.Parse(textBox6.Text), 16).Substring(1, 2), 16);
buf[5] = Convert.ToByte(f);
}
else
{
int d = Convert.ToInt32(Convert.ToString(int.Parse(textBox6.Text), 16).Substring(0, 2), 16);
buf[4] = Convert.ToByte(d);
int f = Convert.ToInt32(Convert.ToString(int.Parse(textBox6.Text), 16).Substring(2, 2), 16);
buf[5] = Convert.ToByte(f);
}
}
p = int.Parse(textBox6.Text) * 2 + 5;
byte[] buf1 = new byte[n + 2];
byte[] ReturnData = new byte[2];
ReturnData = CRC16_C(buf);
for (int i = 0; i < n; i++)
{
buf1[i] = buf[i];
}
buf1[n] = ReturnData[1];
buf1[n + 1] = ReturnData[0];
sp.Write(buf1.ToArray(), 0, n + 2);
}
void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
int n = sp.BytesToRead;
byte[] TxData = new byte[n];//声明一个临时数组存储当前来的串口数据
sp.Read(TxData, 0, n); //读取缓冲数据
m = m + n;
this.Invoke((EventHandler)
(delegate
{
Array.Resize(ref TxData2, m);//改写数组大小
TxData.CopyTo(TxData2, m - TxData.Length);
if (m == p)
{
byte[] data = new byte[p - 2];
for (int i = 0; i < TxData2.Length - 2; i++)
{
data[i] = TxData2[i];
}
byte[] data2 = new byte[2];
data2[0] = TxData2[TxData2.Length - 2];
data2[1] = TxData2[TxData2.Length - 1];
byte[] data1 = new byte[2];
data1 = CRC16_C(data);
if (data1[0] == data2[1] && data1[1] == data2[0])
{
for (int j = 3; j <= m - 4; j = j + 2)
{
string s1 = TxData2[j].ToString();
string s2 = TxData2[j + 1].ToString();
string s = s1 + s2;
int g = Convert.ToInt32(s, 10);
string h = g.ToString();
textBox1.Text += h + " ";
}
textBox7.Text = "读取成功";
}
else
{
textBox7.Text = "读取失败";
}
m = 0;
}
}
)
);
}
public byte[] CRC16_C(byte[] data)
{
byte CRC16Lo;
byte CRC16Hi;
byte CL; byte CH;
byte SaveHi; byte SaveLo;
byte[] tmpData;
int Flag;
CRC16Lo = 0xFF;
CRC16Hi = 0xFF;
CL = 0x01;
CH = 0xA0;
tmpData = data;
for (int i = 0; i < tmpData.Length; i++)
{
CRC16Lo = (byte)(CRC16Lo ^ tmpData[i]);
for (Flag = 0; Flag <= 7; Flag++)
{
SaveHi = CRC16Hi;
SaveLo = CRC16Lo;
CRC16Hi = (byte)(CRC16Hi >> 1);
CRC16Lo = (byte)(CRC16Lo >> 1);
if ((SaveHi & 0x01) == 0x01)
{
CRC16Lo = (byte)(CRC16Lo | 0x80);
}
if ((SaveLo & 0x01) == 0x01)
{
CRC16Hi = (byte)(CRC16Hi ^ CH);
CRC16Lo = (byte)(CRC16Lo ^ CL);
}
}
}
byte[] ReturnData = new byte[2];
ReturnData[0] = CRC16Hi;
ReturnData[1] = CRC16Lo;
return ReturnData;
