中档RFID阅读器和Vb.net应用程序

Question

我设法使用vb.net在VS2010中创建一个简单的应用程序，以便从COM2接收数据。

我的RFID阅读器通过RS232连接。当我的读卡器检测到我的被动或有源RFID标签时，我收到的数据只是＆＃34;？＆＃34;。

我是否需要转换标签的数据？

这是我到目前为止的代码。

Imports System.IO.Ports

Class MainWindow

Private Sub Window_Loaded(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
    Label1.Visibility = Windows.Visibility.Hidden
    Label2.Visibility = Windows.Visibility.Hidden
    TextBox1.Text = com1.PortName
    TextBox2.Text = com1.BaudRate

    Button1.IsEnabled = False
    Try

        With com1
            .DtrEnable = True
            .RtsEnable = True
            .Handshake = IO.Ports.Handshake.None
            AddHandler .DataReceived, AddressOf DataReceivedHandler
        End With
        com1.Open()

        If com1.IsOpen = True Then
            Label1.Visibility = Windows.Visibility.Visible
        End If
    Catch ex As Exception
        MessageBox.Show("Error")
    End Try
End Sub

Private Shared Sub DataReceivedHandler(sender As Object, e As SerialDataReceivedEventArgs)
    Dim sp As SerialPort = CType(sender, SerialPort)
    Dim indata As String = sp.ReadExisting()
    MessageBox.Show(indata)
End Sub