在同一個 COM 端口上使用兩個串口 - WPF C#

Question

我有一個地磅應用程序，我使用串行端口從地磅獲取重量。

我需要舉重兩次。 一輛是空卡車，然后是滿載卡車。 我只是想知道我是否可以使用兩個串口，一個用於稱重空卡車，另一個用於稱重裝載一個？ 就像是

 spWeighIn = new SerialPort("COM1", 2400, Parity.None, 8, StopBits.One);
 spWeighOut = new SerialPort("COM1", 2400, Parity.None, 8, StopBits.One);

並同時使用它們

謝謝

這是我的代碼：

    SerialPort spWeigh;
    string strResponseWeigh;

    private delegate void SetTextDeleg(string text);

    public MainWindow()
    {
        InitializeComponent();
        this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
    }

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        spWeigh = new SerialPort("COM1", 2400, Parity.None, 8, StopBits.One);
        spWeigh.RtsEnable = false;
        spWeigh.DtrEnable = false;
        spWeigh.Handshake = Handshake.None;
        spWeigh.ReadTimeout = 10000;   
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        if (!spWeigh.IsOpen)
            spWeigh.Open();
        spWeigh.DataReceived += new SerialDataReceivedEventHandler(spWeigh_DataInReceived);
        spWeigh.Write("W");   
    }

    void spWeigh_DataInReceived(object sender, SerialDataReceivedEventArgs e)
    {
        strResponseWeigh = spWeigh.ReadLine();         
        string wt = strResponseWeigh.Substring(5, 7);
        this.TxtFrstWt.Dispatcher.BeginInvoke(new SetTextDeleg(sin_DataReceived), new object[] { wt });
    }

    private void sin_DataReceived(string data)
    {
        TxtFrstWt.Text = data.Trim();
        TxtDateIn.Text = DateTime.Now.ToString("dd/MM/yyyy");         
    }

    private void button2_Click(object sender, RoutedEventArgs e)
    {
        if (!spWeigh.IsOpen)
            spWeigh.Open();
        spWeigh.DataReceived += new SerialDataReceivedEventHandler(spWeigh_DataOutReceived);
        spWeigh.Write("W");   
    }

    void spWeigh_DataOutReceived(object sender, SerialDataReceivedEventArgs e)
    {
        strResponseWeigh = spWeigh.ReadLine();               
        string wt = strResponseWeigh.Substring(5, 7);               
        this.TxtFrstWt.Dispatcher.BeginInvoke(new SetTextDeleg(sout_DataReceived), new object[] { wt });
    }
    private void sout_DataReceived(string data)
    {
        TxtScndryWt.Text = data.Trim();
        TxtDateOut.Text = DateTime.Now.ToString("dd/MM/yyyy");
    }
}

Answer 1

我認為這行不通。 為什么你甚至需要兩個到串口的連接呢？

以任何方式從端口讀取重量並保存結果。 然后用加載的重復該步驟。 計算差異，你就完成了。

為什么要使用SerialPort的兩個實例？ 您不必將結果保存在這些對象中。

Answer 2

讓我看看我是否做對了。

你是說你有一個連接到串口的設備，你需要從那里讀取兩次信息，對吧？

處理該問題時，您的代碼有些混亂。 我會像這樣重做它：

SerialPort spWeigh;
string strResponseWeigh;

private delegate void SetTextDeleg(string text);

public MainWindow()
{
    InitializeComponent();
    this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
}

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    spWeigh = new SerialPort("COM1", 2400, Parity.None, 8, StopBits.One);
    spWeigh.RtsEnable = false;
    spWeigh.DtrEnable = false;
    spWeigh.Handshake = Handshake.None;
    spWeigh.ReadTimeout = 10000; 
    spWeigh.DataReceived += spWeigh_DataInReceived;
    spWeigh.Open();
}

private void button1_Click(object sender, RoutedEventArgs e)
{
    spWeigh.Write("W"); 
}

void spWeigh_DataInReceived(object sender, SerialDataReceivedEventArgs e)
{
    strResponseWeigh = spWeigh.ReadLine();
    string wt = strResponseWeigh.Substring(5, 7);
    this.TxtFrstWt.Dispatcher.BeginInvoke(new SetTextDeleg(sin_DataReceived), new object[] { wt });
}

private void sin_DataReceived(string data)
{
    TxtFrstWt.Text = data.Trim();
    TxtDateIn.Text = DateTime.Now.ToString("dd/MM/yyyy");
}

你看，你不需要每次點擊按鈕時都附加事件處理程序，這就是為什么行

spWeigh.DataReceived += spWeigh_DataInReceived;

出現在MainWindow_Loaded事件處理程序中。

嘗試多次打開串行連接可能會導致一些問題，這些問題也會出現在加載的事件處理程序中。

如果我理解正確的過程，每次設備通過串行接口接收到W時，它都會通過同一個串行端口溢出秤中的重量，對嗎？

這樣，您需要做的就是在單擊按鈕時發送一個“W”，結果應該出現在數據接收事件處理程序上。