Question

我正在尝试编写一个简单的Forms应用程序，以通过USB端口将数据发送到监听终端设备。有人告诉我，我需要使用STX ETX LRC成帧发送数据，但是我不知道这意味着什么。我是我们公司的软件测试人员，不熟悉通过USB进行数据传输。有谁可以帮助我吗？这是我当前的表单代码：

private void sendRequestButton_Click(object sender, EventArgs e)
{
    try
    {
        _serialPort = new SerialPort
        {
            PortName = portsDropdown.Text,
            BaudRate = 19200,//connectionTypeDropdown.Text.Equals(Usb) ? 115200 : 19200,
            DataBits = 8,
            Parity = Parity.None,
            StopBits = StopBits.One,
        };

        _serialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

        _serialPort.Open();

        _serialPort.Write(requestTextbox.Text);

    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, @"Caught Exception:", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
    finally
    {
        _serialPort.Close();
    }
}

private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    var serialPort = (SerialPort)sender;
    _response = serialPort.ReadExisting();
    Debug.Print(_response);
}

Answer 1

这就是我用来通过C＃中的串行端口进行连接的内容。这是在WPF中，因此您必须进行一些调整。

using System;
using System.IO.Ports;
using System.Windows;
using System.Windows.Input;

namespace SerialTest
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    private SerialPort port = new SerialPort();
    int intBaud = 0;
    string strComport = "";
    public MainWindow()
    {

        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        string[] ports = SerialPort.GetPortNames();
        cbCom.ItemsSource = ports;
    }
    private void StartUp()
    {
        int intbaud;
        if (int.TryParse(cbBaud.SelectionBoxItem.ToString(), out intbaud))
        {
            intBaud = intbaud;
           strComport = cbCom.SelectedItem.ToString();

            SerialStart();
        }
        else
        {
            MessageBox.Show("Enter a valid Baudrate");
        }
    }
    private void SerialStart()
    {
        try
        {
            port.BaudRate = int.Parse(cbBaud.SelectionBoxItem.ToString());
            port.DataBits = 8;
            port.StopBits = (StopBits)Enum.Parse(typeof(StopBits), "One");
            port.Parity = (Parity)Enum.Parse(typeof(Parity), "None");
            port.PortName = cbCom.SelectedItem.ToString();
            port.DataReceived += new SerialDataReceivedEventHandler(SerialReceive);
            port.Handshake = Handshake.None;
            if (port.IsOpen) port.Close();
            port.Open();
        }
        catch (Exception ex)
        {
            txtTerm.AppendText(ex.ToString());
        }
    }
    public enum LogMsgType { Incoming, Outgoing, Normal, Warning, Error };
    private void Log(LogMsgType msgtype, string msg)
    {
        try
        {
            txtTerm.Dispatcher.Invoke(new EventHandler(delegate
            {
                txtTerm.AppendText(msg);
            }));
        }
        catch (Exception ex)
        {
            ex.ToString();
        }
    }
    private void SerialReceive(object sender, SerialDataReceivedEventArgs e)
    {
        if (!port.IsOpen) return;
        string data = port.ReadExisting();
        this.Dispatcher.Invoke(() =>
        {
            txtTerm.AppendText(data);
            txtTerm.ScrollToEnd();
        });
    }

    private void txtInput_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Return && port.IsOpen)
        {
            try
            {
                port.WriteLine(txtInput.Text + "\r\n");
            }
            catch (Exception ex)
            {
                this.Dispatcher.Invoke(() =>
                {
                    txtTerm.AppendText(ex.ToString()); ;
                });
            }
            this.Dispatcher.Invoke(() =>
            {
                txtTerm.AppendText(txtInput.Text + "\n");
                txtInput.Text = "";
            });
        }
    }
}
}

修改对于STX和ETC来说，您还必须将字符转换为字节 https://www.codeproject.com/questions/1107562/sending-ascii-control-stx-and-etx-in-csharp

使用STX ETC LRC成帧通过USB发送数据（SerialPort对象）

1 个答案: