SerialPort.DataReceived返回奇怪的結果

Question

我目前正在使用稱爲Fluke 5500A多產品校準設備的設備。我用C＃編寫了一個小程序來與它進行交互，並學習更多關於它是如何工作的，但不幸的是，SerialPort.DataReceived給了我一些非常奇怪的結果。該計劃的時間不長，所以我打算將它張貼在其全部在這裏：

class Program 
{ 
    static public bool isExecuting = true; 
    static private string serialCommand; 
    static private string dataReceived; 

    static void Main(string[] args) 
    { 
     SerialPortConnection serialPort = new SerialPortConnection(); 

     serialPort.OpenSerialConnection(); 

     while (isExecuting == true) 
     { 
      Console.WriteLine("Enter a command or type q to quit."); 
      serialCommand = Console.ReadLine().ToUpper(); 

      if (serialCommand == "Q") 
       isExecuting = false; 
      else if (serialCommand == "CLEAR") 
       Console.Clear(); 
      else 
      { 
       dataReceived = serialPort.WriteSerialConnection(serialCommand); 
       Console.WriteLine(dataReceived); 
      } 
     } 

     serialPort.CloseSerialConnection(); 
    } 
} 

}

而且我SerialPortConnection類：

public class SerialPortConnection 
{ 
    private SerialPort serialPort; 
    private string dataReceived = "none"; 

    public SerialPortConnection(string comPort = "Com3", int baud = 9600, System.IO.Ports.Parity parity = System.IO.Ports.Parity.None, int dataBits = 8, System.IO.Ports.StopBits stopBits = System.IO.Ports.StopBits.One) 
    { 
     serialPort = new SerialPort(comPort, baud, parity, dataBits, stopBits); 
    } 

    public void OpenSerialConnection() 
    { 
     try 
     { 
      serialPort.Open(); 
     } 
     catch (Exception e) 
     { 
      Console.Write("\nError"); 
      Console.Write(e); 
     } 
    } 

    public string WriteSerialConnection(string SerialCommand) 
    { 
     try 
     { 
      serialPort.Write(String.Format(SerialCommand + "\r")); 
      dataReceived = serialPort.ReadExisting(); 
      return dataReceived; 
     } 
     catch (Exception e) 
     { 
      Console.Write("\nError"); 
      Console.Write(e); 
      return "Execution Unsuccessful"; 
     } 
    } 

    public void CloseSerialConnection() 
    { 
     try 
     { 
      serialPort.Close(); 
     } 
     catch (Exception e) 
     { 
      Console.Write("\nError"); 
      Console.Write(e); 
     } 
    } 
} 

我的問題是目前輸出到控制檯看起來像這樣：

Enter a command or type q to quit. 
*IDN? 

Enter a command or type q to quit. 
OUT 50V <-- Command input 
*IDN? <-- Previous command echoed back 
FLUKE,5500A,8030005,2.61+1.3+2.0+* <-- Data received from previous command 
161> 
Enter a command or type q to quit. 
OPER 
OUT 50V 
162> 
Enter a command or type q to quit. 
STBY 
OPER 
163> 
Enter a command or type q to quit. 
*RST 
STBY 
164> 
Enter a command or type q to quit. 

該命令執行得很好，但輸出到公司nsole似乎是被執行的最後一個命令以及該命令返回的任何數據。我不知道爲什麼會這樣。

編輯：

感謝羅伯特·普的回答我實現下面的代碼：你的問題的

var received = ""; 
bool isReading = true; 
while (isReading == true) 
{ 
    try 
    { 
     received += serialPort.ReadExisting(); 
     if (received.Contains('>')) 
      isReading = false; 
    } 
    catch (Exception e) 
    { 
    } 
} 
Console.WriteLine(received); 

Answer 1

一個部分是串行通信是遠遠瞬間。 .ReadExisting()方法從SerialPort對象的緩衝區中提取數據，但不做任何事情來確保設備已完成發出其命令。想想看這樣的：

+----+   +----------+   +------------+ 
|Your|--Command-->|Serial |---UART--->| Device | 
|Code|   |Port Obj |   |   | 
+----+   +----------+   +------------+ 

+----+   +----------+   +------------+ 
|Your|<--Read-----|Serial |   |Device  | 
|Code| (is empty) |   |   |(processing)| 
+----+   +----------+   +------------+ 

+----+   +----------+   +------------+ 
|Your|   |Serial |<-response-|Device  | 
|Code|   |(has data)|   |(responding)| 
+----+   +----------+   +------------+ 

+----+   +----------+   +------------+ 
|Your|--Command2->|Serial |---UART--->| Device | 
|Code|   |(has data)|   |   | 
+----+   +----------+   +------------+ 

+----+   +----------+   +------------+ 
|Your|<--Read-----|Serial |   |Device  | 
|Code| (previous |   |   |(processing)| 
+----+ response) +----------+   +------------+ 

相反，尋找一個圖案，標記或其他識別標記知道傳輸完成之前發送下一個命令。繼續閱讀（期待超時 - 他們被拋出作爲例外！），直到你知道你已收到整個答覆。在這種情況下，可能是>字符表示「準備好進行更多輸入」。您可以將其解釋爲「響應已完成」。