Serial data coming cuts off at 16 characters

[EDN Admin]

Using open source code and trying to modify to parse data out into 6 different text boxes. Sample string expected in looks like this, "01+11111 02+22222 03+33333 04+44444 05+55555 06+66666" Main receive box shows all of it but when I try to work with it
the data cuts off at 16 characters. Ive tried many ideas without luck. Some of my code will show this.
Code:
<pre class="prettyprint lang-vb Serial Port Interfacing with VB.net 2010 Express Edition
Copyright (C) 2010 Richard Myrick T. Arellaga

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Imports System
Imports System.ComponentModel
Imports System.Threading
Imports System.IO.Ports
Public Class frmMain
Dim myPort As Array COM Ports detected on the system will be stored here
Dim inputData As String
Delegate Sub SetTextCallback(ByVal [text] As String) Added to prevent threading errors during receiveing of data

Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
When our form loads, auto detect all serial ports in the system and populate the cmbPort Combo box.
myPort = IO.Ports.SerialPort.GetPortNames() Get all com ports available
cmbBaud.Items.Add(9600) Populate the cmbBaud Combo box to common baud rates used
cmbBaud.Items.Add(19200)
cmbBaud.Items.Add(38400)
cmbBaud.Items.Add(57600)
cmbBaud.Items.Add(115200)

For i = 0 To UBound(myPort)
cmbPort.Items.Add(myPort(i))
Next
cmbPort.Text = cmbPort.Items.Item(0) Set cmbPort text to the first COM port detected
cmbBaud.Text = cmbBaud.Items.Item(0) Set cmbBaud text to the first Baud rate on the list

btnDisconnect.Enabled = False Initially Disconnect Button is Disabled

End Sub

Private Sub btnConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConnect.Click
SerialPort1.PortName = cmbPort.Text Set SerialPort1 to the selected COM port at startup
SerialPort1.BaudRate = cmbBaud.Text Set Baud rate to the selected value on

Other Serial Port Property
SerialPort1.Parity = IO.Ports.Parity.None
SerialPort1.StopBits = IO.Ports.StopBits.One
SerialPort1.DataBits = 8 Open our serial port
SerialPort1.Open()

btnConnect.Enabled = False Disable Connect button
btnDisconnect.Enabled = True and Enable Disconnect button

End Sub

Private Sub btnDisconnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisconnect.Click
SerialPort1.Close() Close our Serial Port

btnConnect.Enabled = True
btnDisconnect.Enabled = False
End Sub

Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
SerialPort1.Write(txtTransmit.Text & vbCr) The text contained in the txtText will be sent to the serial port as ascii
plus the carriage return (Enter Key) the carriage return can be ommitted if the other end does not need it
End Sub

Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
ReceivedText(SerialPort1.ReadExisting()) Automatically called every time a data is received at the serialPort

End Sub

Private Sub ReceivedText(ByVal [text] As String)
compares the ID of the creating Thread to the ID of the calling Thread
If Me.rtbReceived.InvokeRequired Then
Dim x As New SetTextCallback(AddressOf ReceivedText)
Me.Invoke(x, New Object() {(text)})
Else
Me.rtbReceived.Text = [text]
Dim thisData As String = [text]
If Mid([text], 1, 3) = "01+" Then
Me.txtSensorID.Text = [text].Substring(3, 5)
Me.txtWindSpeed.Text = [text].Substring(13, 5)
Me.txtWindDirection.Text = [text].Substring(22, 5) Mid(thisData, 22, 5)
Me.txtWindDirection.Refresh()
Me.txtTemperature.Text = Mid$([text], 31, 5)
Me.txtTemperature.Refresh()
Me.txtRelativeHumidity.Text = Mid$([text], 40, 5)
Me.txtRelativeHumidity.Refresh()
Me.txtBarometricPressure.Text = Mid$([text], 49, 5)
Me.txtBarometricPressure.Refresh()
01+11111 02+22222 03+33333 04+44444 05+55555 06+66666 = Incoming sample string
End If

End If
End Sub

Private Sub cmbPort_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbPort.SelectedIndexChanged
If SerialPort1.IsOpen = False Then
SerialPort1.PortName = cmbPort.Text pop a message box to user if he is changing ports
Else without disconnecting first.
MsgBox("Valid only if port is Closed", vbCritical)
End If
End Sub

Private Sub cmbBaud_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbBaud.SelectedIndexChanged
If SerialPort1.IsOpen = False Then
SerialPort1.BaudRate = cmbBaud.Text pop a message box to user if he is changing baud rate
Else without disconnecting first.
MsgBox("Valid only if port is Closed", vbCritical)
End If
End Sub
End Class
[/code]
<br/>


View the full article