Serial Port ReadTimeout Property

I have an application that will read the entire line of a string then parse it out accordingly, what im seeing is that is I set me ReadTimeout to a different number i think the serial port is closing both it gets all the data.... How can I Close the port or control the Readouttime better by just looking for a CRLF rather then an actual variable time.

Public Sub GetDSIInput(ByVal serialPort As IO.Ports.SerialPort, ByVal pfile As PartfileLibrary.Gages)
        Dim bytes(4096) As Byte
        Try
            serialPort.ReadTimeout = 5000
            serialPort.DiscardInBuffer()
 
            Dim strData As String = String.Empty
 
            If Not serialPort.IsOpen Then
                strData = String.Empty
            Else
                strData = serialPort.ReadLine
            End If
 
            If strData.Length > 0 Then
                Dim tempArray() As String
                strData = strData.Replace(vbCrLf, vbTab).Replace(Chr(26), "").Replace(Chr(12), "").Replace(Chr(13), "")
                'parses out the information gathered from the COM port to a temp location
                tempArray = Split(strData, vbTab)
 
                If serialPort.BaudRate = 9600 Then
                    DSICollector = "585 Plus"
                    Get585PlusData(tempArray)
                Else
                    DSICollector = "501/440"
                    Get501Data(tempArray)
                End If
            End If
 
        Catch tex As TimeoutException
            'do nothing as this will happen while waiting
        Catch ioError As System.IO.IOException
            'do nothing as this will occur sometimes when closing the thread
        Catch ex As Exception
            tListener.AddMethodError(ex)
        End Try
    End Sub

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