C# 使用C中的串行端口从称重机获取重量#

我正在开发一个应用程序，使用C#Net从地磅机上获取重量。我尝试了很多方法，但是，未从称重机读取正确的数据格式重量。我从串行端口连续获取像

？x？？？？？x？x？x？？？x？？？x？？？x？

一样的输出。我想从称重机获取重量。我的代码如下所示：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO;

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

        String a = "";

        private void button1_Click(object sender, EventArgs e)
        {
        serialPort1 = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
         serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);

        if (serialPort1.IsOpen == false)
        {
            serialPort1.Open();
        }
        timer1.Start();
        button1.Enabled = false;
        button2.Enabled = true;
        }

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            a = a + serialPort1.ReadExisting();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (a.Length != 0)
            {
                textBox1.AppendText(a);
                a = "";
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen == true)
            {
                serialPort1.Close();
                button2.Enabled = false;
                button1.Enabled = true;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen == true)
            {
                button1.Enabled = false;
                button2.Enabled = true;
            }
            else
            {
                button1.Enabled = true;
                button2.Enabled = false;
            }
        }
    }
}

我的代码是将串行端口数据中的文本附加到文本框中，但它只显示为

？xxx？xxxx？xxxx？

有谁能帮我用c从串口获取重量吗#

谢谢你阅读我的帖子

如果使用ReadExisting（），该方法会尝试将端口接收的字节转换为字符串。如果转换失败，您将得到一个问号。默认编码是ASCII，128和255之间的字节值不是ASCII字符，因此产生

几个可能的原因，大致按可能性顺序排列：

• 使用错误的波特率，尤其是猜测过高
• 设备可能正在发送二进制数据，而不是字符串。这需要使用Read（）而不是ReadExisting并解码二进制数据
• 由于长电缆屏蔽不够好而产生的电气噪音。通过断开桥端的电缆，很容易消除可能的原因。如果这停止了数据，那么不太可能是噪声

---

务必彻底阅读本手册。如果您没有或无法理解该设备，请联系该设备的供应商。

此代码将在后台连续读取weightbridge。确保使用串行端口连接电脑。同样，在设计页面Form1.cs[design]中，您需要从工具箱中添加串行端口。这个代码适合我，我希望它也适合你

public partial class Form1 : Form
{
    //Initialize the port and background Worker
    private SerialPort port;
    private BackgroundWorker backgroundWorker_Indicator;

public Form1()
{
backgroundWorker_Indicator = new BackgroundWorker();
backgroundWorker_Indicator.WorkerSupportsCancellation = true;
backgroundWorker_Indicator.DoWork += new DoWorkEventHandler(Indicator_DoWork);
//set the port according to your requirement.
port = new SerialPort("COMM2", 2400, Parity.None, 8, StopBits.One);
port.DataReceived += new SerialDataReceivedEventHandler(this.Indicator_DataReceived);
}

//button which starts the method. You can also put the method in Form1_Load() 
private void SerialPortButton(object sender, EventArgs e)
{
StartStopIndicator();
}

 private void StartStopIndicator()
 {
     try
     {
         port.Open();
         backgroundWorker_Indicator.RunWorkerAsync();

     }catch (Exception ea)
         {
         MessageBox.Show("13 "+ea.Message);
         }
  }
  // Not a button. Just a methood.
  private void Indicator_DoWork(object sender, DoWorkEventArgs e)
    {

    }
private void Indicator_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        try
        {
            string str = StripNonNumeric(port.ReadLine());
            UpdateWeightOnUI(str);
        }
        catch (Exception eb)
        {
            MessageBox.Show("12"+eb.Message);
        }
    }
private void UpdateWeightOnUI(string Weight)
    {
        try
        {
            // A label named weightLabel from the toolbox. This will keep updating on weight change automatically
            if (weightLabel.InvokeRequired)
            {
                this.Invoke((Delegate)new Form1.SetTextCallBack(this.UpdateWeightOnUI), (object)Weight);
            }
            else
            {
                weightLabel.Text = Weight;
            }
        }
        catch (Exception ec)
        {
            MessageBox.Show("11"+ec.Message);
        }
    }
// This method will remove all other things except the integers 
private string StripNonNumeric(string original)
    {
        StringBuilder stringBuilder = new StringBuilder();
        foreach (char c in original)
        {
            if (char.IsDigit(c))
                stringBuilder.Append(c);
        }
        return stringBuilder.ToString();
    }
private delegate void SetTextCallBack(string text);

---

你首先需要知道它是怎么写的。显然不是ASCII。@HenkHolterman你说的是将串口数据转换成ASCII值吗？我是说有很多方法可以让网桥对信息进行编码。你需要规格和文件。@Henkholtman你能发布任何链接来解码信息吗？不，我不知道你的设备是什么。