从体重秤设备通过 COM 到 USB 端口的不可读输入

我有正常的代码从COM端口读取输入：

public static void Main()
{
    SerialPort mySerialPort = new SerialPort("COM1");
    mySerialPort.BaudRate = 9600;
    mySerialPort.Parity = Parity.None;
    mySerialPort.StopBits = StopBits.One;
    mySerialPort.DataBits = 8;
    mySerialPort.Handshake = Handshake.None;
    mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
    mySerialPort.Open();
    Console.WriteLine("Press any key to continue...");
    Console.WriteLine();
    Console.ReadKey();
    mySerialPort.Close();
}
private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;
    string indata = sp.ReadExisting();
    Debug.Print("Data Received:");
    Debug.Print(indata);
}

并且这段代码可以正常工作，但是我在设备屏幕上收到了这样的 ??BH003?00和值003100KG.

那么我如何格式化它或将其转换为可读性呢？

谢谢。