6

我被分配使用 C# 将体重从称重秤 (CAS CI-201A) 显示到文本框中。重量将通过串口 RS-232 或 USB 转换器发送。秤在我身边，但我不知道从哪里开始。我怎样才能实现我的目标？

4

8 回答 8

11

你有没有尝试过什么？

如果您想使用串行端口，首先让用户选择使用哪个端口是有意义的。这可以通过使用所有可用端口填充组合框来轻松完成。

        private void Form1_Load(object sender, EventArgs e)
    {
        string[] portNames = SerialPort.GetPortNames();
        foreach (var portName in portNames)
        {
            comboBox1.Items.Add(portName);
        }
        comboBox1.SelectedIndex = 0;
    }

此代码使用一个带有组合框的表单，称为“comboBox1”（默认）。您将需要添加：

using System.IO.Ports;

到 using 指令。

然后在表单中添加一个按钮 (button1) 和一个多行文本框 (textbox1) 并添加以下代码：

        private void button1_Click(object sender, EventArgs e)
    {
        _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 8, StopBits.One);
        _serialPort.DataReceived += SerialPortOnDataReceived;
        _serialPort.Open();
        textBox1.Text = "Listening on " + comboBox1.Text + "...";
    }

    private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
    {
        while(_serialPort.BytesToRead >0)
        {
            textBox1.Text += string.Format("{0:X2} ", _serialPort.ReadByte());
        }
    }

这还需要您添加：

    private SerialPort _serialPort;
    private const int BaudRate = 9600;

正下方的左括号

public partial class Form1 : Form

单击按钮后，从选定的 comPort 接收到的所有数据将在 TextBox 中显示为十六进制值。

免责声明：上述代码不包含错误处理，如果多次单击 button1 将产生错误，因为之前的“SerialPort”实例未正确关闭。使用此示例时请记住这一点。

问候尼科

完整代码：

using System;
using System.IO.Ports;          //<-- necessary to use "SerialPort"
using System.Windows.Forms;

namespace ComPortTests
{
    public partial class Form1 : Form
    {
        private SerialPort _serialPort;         //<-- declares a SerialPort Variable to be used throughout the form
        private const int BaudRate = 9600;      //<-- BaudRate Constant. 9600 seems to be the scale-units default value
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string[] portNames = SerialPort.GetPortNames();     //<-- Reads all available comPorts
            foreach (var portName in portNames)
            {
                comboBox1.Items.Add(portName);                  //<-- Adds Ports to combobox
            }
            comboBox1.SelectedIndex = 0;                        //<-- Selects first entry (convenience purposes)
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //<-- This block ensures that no exceptions happen
            if(_serialPort != null && _serialPort.IsOpen)
                _serialPort.Close();
            if (_serialPort != null)
                _serialPort.Dispose();
            //<-- End of Block

            _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 8, StopBits.One);       //<-- Creates new SerialPort using the name selected in the combobox
            _serialPort.DataReceived += SerialPortOnDataReceived;       //<-- this event happens everytime when new data is received by the ComPort
            _serialPort.Open();     //<-- make the comport listen
            textBox1.Text = "Listening on " + _serialPort.PortName + "...\r\n";
        }

        private delegate void Closure();
        private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
        {
            if (InvokeRequired)     //<-- Makes sure the function is invoked to work properly in the UI-Thread
                BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); }));     //<-- Function invokes itself
            else
            {
                while (_serialPort.BytesToRead > 0) //<-- repeats until the In-Buffer is empty
                {
                    textBox1.Text += string.Format("{0:X2} ", _serialPort.ReadByte());
                        //<-- bytewise adds inbuffer to textbox
                }
            }
        }
    }
}
于 2012-05-16T08:27:18.063 回答
7

基于此：

监听 COM1... 30 30 33 33 20 49 44 5F 30 30 3A 20 20 20 31 30 2E 36 20 6B 67 20 0D 0A 0D 0A

作为这个的ASCII：

0033 ID_00：10.6 公斤

您可以通过修剪接收到的字符串来获得结果。假设您的侦听器将字节放入数组中byte[] serialReceived：

string reading = System.Text.Encoding.UTF8.GetString(serialReceived);
textBox1.Text = reading.Substring(13);
于 2012-05-18T16:52:59.913 回答
5

首先，在您开始编写任何代码之前，我会检查您是否使用了正确的电缆。尝试打开您选择的串行终端（HyperTerm、putty）并检查是否有任何数据。

确保在体重秤和终端程序上配置相同的波特率、停止位和奇偶校验。

如果您收到数据（终端程序至少应该显示一些垃圾），那么您可以继续编码。如果没有，请检查您是否使用了正确的电缆（nullmodem aka cross-over）。

当你走到这一步时，你可以使用SerialPortC# 的类 http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx

于 2012-05-16T08:11:38.287 回答
2

根据亚当的建议，我将输出转换为人类可读的格式（从 ASCII 到 UTF8）我将字节放入数组 byte[]

private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
        {
            if (InvokeRequired)     //<-- Makes sure the function is invoked to work properly in the UI-Thread
                BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); }));     //<-- Function invokes itself
            else
            {
                int dataLength = _serialPort.BytesToRead;
                byte[] data = new byte[dataLength];
                int nbrDataRead = _serialPort.Read(data, 0, dataLength);
                if (nbrDataRead == 0)
                    return;
                string str = System.Text.Encoding.UTF8.GetString(data);
                textBox1.Text = str.ToString();
            }
        }

这是完整的工作代码

using System;
using System.IO.Ports;          //<-- necessary to use "SerialPort"
using System.Windows.Forms;

namespace ComPortTests
{
    public partial class Form1 : Form
    {
        private SerialPort _serialPort;         //<-- declares a SerialPort Variable to be used throughout the form
        private const int BaudRate = 9600;      //<-- BaudRate Constant. 9600 seems to be the scale-units default value
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string[] portNames = SerialPort.GetPortNames();     //<-- Reads all available comPorts
            foreach (var portName in portNames)
            {
                comboBox1.Items.Add(portName);                  //<-- Adds Ports to combobox
            }
            comboBox1.SelectedIndex = 0;                        //<-- Selects first entry (convenience purposes)
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //<-- This block ensures that no exceptions happen
            if(_serialPort != null && _serialPort.IsOpen)
                _serialPort.Close();
            if (_serialPort != null)
                _serialPort.Dispose();
            //<-- End of Block

            _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 8, StopBits.One);       //<-- Creates new SerialPort using the name selected in the combobox
            _serialPort.DataReceived += SerialPortOnDataReceived;       //<-- this event happens everytime when new data is received by the ComPort
            _serialPort.Open();     //<-- make the comport listen
            textBox1.Text = "Listening on " + _serialPort.PortName + "...\r\n";
        }

        private delegate void Closure();
        private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
        {
            if (InvokeRequired)     //<-- Makes sure the function is invoked to work properly in the UI-Thread
                BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); }));     //<-- Function invokes itself
            else
            {
                int dataLength = _serialPort.BytesToRead;
                byte[] data = new byte[dataLength];
                int nbrDataRead = _serialPort.Read(data, 0, dataLength);
                if (nbrDataRead == 0)
                    return;
                string str = System.Text.Encoding.UTF8.GetString(data);
                textBox1.Text = str.ToString();
            }
        }
}

如果您使用的是 A&D EK V 校准型号：和 EK-610V。你已经使用 BaudRate = 2400; 和数据位 = 7

注意：如果你得到这样的输出 在此处输入图像描述

您必须检查 BaudRate、DataBits（请参阅您的称重机手册）或检查您的电缆

于 2016-10-30T11:52:32.280 回答
2

我使用的是 Anto sujesh 的代码，但我遇到的问题是我从秤中获得的一些值已损坏。我通过缓冲缓存文件中的值来解决它。

        private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
    {

        if (InvokeRequired)     //<-- Makes sure the function is invoked to work properly in the UI-Thread
            BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); }));     //<-- Function invokes itself
        else
        {
            int dataLength = _serialPort.BytesToRead;                

            byte[] data = new byte[dataLength];
            int nbrDataRead = _serialPort.Read(data, 0, dataLength);
            if (nbrDataRead == 0)
                return;
            string str = Encoding.UTF8.GetString(data);

            //Buffers values in a file
            File.AppendAllText("buffer1", str);

            //Read from buffer and write into "strnew" String
            string strnew = File.ReadLines("buffer1").Last();

            //Shows actual true value coming from scale
            textBox5.Text = strnew;
于 2017-03-23T15:23:28.933 回答
0 
    using System;
    using System.IO.Ports;         
    using System.Windows.Forms;
    namespace ComPortTests
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
                private SerialPort _serialPort = null;
    private void Form1_Load(object sender, EventArgs e)
    {
     _serialPort = new SerialPort("COM1", 9600, Parity.None, 8);

     _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived);

     _serialPort.Open();
    }

    void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)

            {

                string data = _serialPort.ReadExisting();
                textBox2.Text = data;    
            }
    }
}
于 2017-03-23T05:18:45.890 回答
0

我正在使用 连接到我的串口的yaohua xk3190-a9体重秤。在尝试了很多代码之后，下面的代码终于为我工作了。我在这里粘贴代码，以便如果有人使用相同的设备可以获得帮助。

    private SerialPort _serialPort;
    private const int BaudRate = 2400;
    private void Form1_Load(object sender, EventArgs e)
    {
        string[] portNames = SerialPort.GetPortNames();
        foreach (var portName in portNames)
        {
            comboBox1.Items.Add(portName);
        }
        comboBox1.SelectedIndex = 0;
        //<-- This block ensures that no exceptions happen
        if (_serialPort != null && _serialPort.IsOpen)
            _serialPort.Close();
        if (_serialPort != null)
            _serialPort.Dispose();
        //<-- End of Block

        _serialPort = new SerialPort(comboBox1.Text, BaudRate, Parity.None, 7, StopBits.One);       //<-- Creates new SerialPort using the name selected in the combobox
        _serialPort.DataReceived += SerialPortOnDataReceived;       //<-- this event happens everytime when new data is received by the ComPort
        _serialPort.Open();     //<-- make the comport listen
    
    }
    private delegate void Closure();
    private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
    {
        if (InvokeRequired)     //<-- Makes sure the function is invoked to work properly in the UI-Thread
            BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); }));     //<-- Function invokes itself
        else
        {
            string data = _serialPort.ReadExisting();
            if (data != null)
            {
                if (data.ToString() != "")
                {
                    if (data.Length > 6)
                    {
                        var result = data.Substring(data.Length - 5);
                        textBox1.Text = result.ToString().TrimStart(new Char[] { '0' });
                    }
                }
            }
          
        }
    }
于 2020-07-31T17:02:52.217 回答
0 
using System;

using System.IO;

using System.IO.Ports;

namespace comport

{
    public partial class Form1 : Form

    {
        public Form1()

        {

            InitializeComponent();
        }

        private SerialPort _serialPort = null;

        private void Form1_Load(object sender, EventArgs e)
        {
            AppConfiguration.sConfigType = "default";

            _serialPort = new SerialPort("COM1", 9600, Parity.None, 8);

            _serialPort.DataReceived += new SerialDataReceivedEventHandler(_serialPort_DataReceived);

            _serialPort.Open();

        }

        void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            string data = _serialPort.ReadExisting();

            textBox2.Text = data;
        }
    }

}
于 2017-03-23T05:31:45.937 回答