.NET Compact Framework 串口通訊實作：SerialPort 類別完整收發範例

在 Windows CE 與 Windows Mobile 裝置上，GPS 接收器等設備常以串口（Serial Port/Com Port）提供存取介面，透過串口接收 NMEA 資料。CF.NET 2.0 起，微軟將串口操作封裝於 System.IO.Ports.SerialPort，大幅簡化操作，無需 P/Invoke。

完整收發類別實作

分離發送與接收邏輯，分別在不同裝置運行：

接收端：ReceiverPort

public class ReceiverPort : IDisposable
{
    private readonly System.IO.Ports.SerialPort serialPort;

    public ReceiverPort()
    {
        serialPort = new System.IO.Ports.SerialPort("COM1", 4800,
            System.IO.Ports.Parity.None, 8, System.IO.Ports.StopBits.One);
        serialPort.Handshake = System.IO.Ports.Handshake.None;

        try
        {
            serialPort.DataReceived += new
                System.IO.Ports.SerialDataReceivedEventHandler(this.serialPort_DataReceived);
            serialPort.Open();
            if (serialPort.IsOpen)
                Console.WriteLine("Open the serial port successful");
            else
                Console.WriteLine("Fail to open the serial port");
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public void Dispose()
    {
        if (serialPort.IsOpen) serialPort.Close();
        serialPort.Dispose();
    }

    private void serialPort_DataReceived(object sender,
        System.IO.Ports.SerialDataReceivedEventArgs e)
    {
        Console.WriteLine("RECEIVED:" + serialPort.ReadLine());
    }
}

發送端：SenderPort

public class SenderPort : IDisposable
{
    private readonly System.IO.Ports.SerialPort serialPort;

    public SenderPort()
    {
        serialPort = new System.IO.Ports.SerialPort("COM1", 4800,
            System.IO.Ports.Parity.None, 8, System.IO.Ports.StopBits.One);
        serialPort.Handshake = System.IO.Ports.Handshake.None;

        try
        {
            serialPort.Open();
            if (serialPort.IsOpen)
                Console.WriteLine("Open the serial port successful");
            else
                Console.WriteLine("Fail to open the serial port");
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public void Dispose()
    {
        if (serialPort.IsOpen) serialPort.Close();
        serialPort.Dispose();
    }

    public bool Send(string str)
    {
        try
        {
            if (serialPort.IsOpen)
            {
                Console.WriteLine("SENT:" + str);
                serialPort.WriteLine(str + "\r");
                return true;
            }
            return false;
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            return false;
        }
    }
}

關鍵設定說明

• 連接埠：COM1（依實際硬體調整）
• 鮑率：4800（GPS 常用，視設備規格調整）
• 奇偶校驗：None
• 資料位：8
• 停止位：One
• 手震協定：None
• 事件驅動接收：DataReceived 事件非同步處理
• 資源釋放：實作 IDisposable 確保關閉與釋放

此模式適用於嵌入式裝置間的可靠串口通訊，代碼結構清晰、易於擴展與維護。