Senden Und Empfangen von SMS Aus GSM-modem

Ich versuche zu senden-Nachricht von GSM-modem. Ich kann senden von AT-Befehlen die Antwort ist OK ohne FEHLER. Aber das problem ist ich kann keine Nachricht senden oder Lesen einer Nachricht.

Ich umgesetzt haben 3 Funktionen:

1. Eine Verbindung zu port
2. SMS Lesen
3. SMS versenden
4. Griffe

1. Eine Verbindung Zu Port:

    Private Sub BtnConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnConnect.Click
            If SerialPort1.IsOpen Then
                SerialPort1.Close()
                BtnConnect.Text = "Connect"
            Else
                Try
                    With SerialPort1
                        .PortName = Trim(Mid(ComboBox1.Text, 1, 5))
                        .BaudRate = 9600
                        .Parity = IO.Ports.Parity.None
                        .DataBits = 8
                        .StopBits = Ports.StopBits.One
                        .Handshake = Ports.Handshake.None
                        .RtsEnable = True
                        .DtrEnable = True
                        .Open()
                        .WriteLine("AT+CNMI=1,2,0,0,0" & vbCrLf) 'send whatever data that it receives to serial port  
                    End With
                    BtnConnect.Text = "Disconnect"
                Catch ex As Exception
                    BtnConnect.Text = "Connect"
                    MsgBox(ex.Message)
                End Try
            End If

        End Sub

2. SMS Lesen

      Private Sub btn_read_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btn_read.Click
            Try
                SerialPort1.WriteLine("AT" & vbCrLf) 'is modem okay?
                Thread.Sleep(1000)

                SerialPort1.WriteLine("AT+CMGF=1" & vbCrLf) 'To format SMS as a TEXT message
                Thread.Sleep(1000)

                SerialPort1.WriteLine("AT+CPMS=""SM""" & vbCrLf) ' Select SIM storage
                Threading.Thread.Sleep(1000)

                SerialPort1.WriteLine("AT+CMGL=""REC UNREAD""" & vbCrLf) 'read unread messages
                Threading.Thread.Sleep(1000)

                SerialPort1.WriteLine("AT+CMGL=""ALL""" & vbCrLf) 'print all message
                Threading.Thread.Sleep(1000)
            Catch ex As Exception
                MsgBox(ex.Message)
            End Try
        End Sub

3. Senden Sie SMS -

 Private Sub btn_send_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btn_send.Click
        Try
            With SerialPort1
                .WriteLine("AT" & vbCrLf)
                Threading.Thread.Sleep(1000)
                .WriteLine("AT+CMGF=1" & vbCrLf) 'Instruct the GSM /GPRS modem to operate in SMS text mode
                Threading.Thread.Sleep(1000)
                .WriteLine("AT+CMGS=""9802100355""" & vbCr) 'sender ko no. rakhne ho tyo txtnumber ma 
                Threading.Thread.Sleep(1000) 'thapeko
                .WriteLine("This is test message" & vbCrLf & Chr(26)) 'txtmessage automatic huna parchha haina?

            End With


        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub

4. Griffe für empfangene Daten in Serieller Port

Private Sub serialport1_datareceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
    'Pause while all data is read
    System.Threading.Thread.Sleep(300)
    rcvdata = SerialPort1.ReadExisting()
    MsgBox(rcvdata, , "Response From AT")
    rcvdata = ""

End Sub

Wo hab ich was verpasst? Beim senden von SMS bekomme ich CMS-500-Fehler. Mit der software von dem modem bin ich in der Lage zu Lesen und senden von sms. Aber brauche ich zur Umsetzung meiner eigenen in meiner software.