VB code for serial port

I need help in interfacing mobile with computer through serial port using visual basic. The signal obtained from RS232 will be passed to IC MAX232. I found some code in VB for serial port, but doesnt seem to work.

The cable used for connection has 9 pins from one side and 4 pins from the other end. I was told that, I have to make some connections internally, by joining some pins, which I will be doing. But, how should the 4 pins from the end be connected??? Can anyone plz send me the Complete information and the proper code in VB for serial port communication, please???

I have searched a lot on internet and tried with lot of codes, but they dont give proper output. First of all, I want to do a simple test of the cable, by obtaining the requied voltage for MAX232, plz tell me.



Thanx a lot.......

CLASS MAIN:
Public Delegate Sub rcvDelegate()

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
'REM This is to send the code to get the sensor names
TextBox6.Text = ""
requestType = "N"
Try
SerialPort1.Write("N" & vbCrLf)
Catch ex As Exception
MsgBox(ex.ToString)
End Try
System.Threading.Thread.Sleep(1000)
End Sub

Public Sub DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
'REM BufferHold is a global variable that holds the string
BufferHold += SerialPort1.ReadExisting
TextBox6.Invoke(New rcvDelegate(AddressOf updateTextBox), New Object() {})
End Sub

Private Sub updateTextBox()
'TextBox6.Text = TextBox6.Text + SerialPort1.ReadExisting()
TextBox6.Text = BufferHold
If requestType = "N" Then
'This is a request for sensor names
SensorNames = BufferHold
End If
If requestType = "R" Then
'This is a request for sensor values
SensorValues = BufferHold
End If
SN1 = SensorNames.Substring(0, 3)
Label3.Text = SN1
SN2 = SensorNames.Substring(5, 3)
Label4.Text = SN2
SN3 = SensorNames.Substring(10, 3)
Label5.Text = SN3
SN4 = SensorNames.Substring(15, 3)
Label6.Text = SN4
SN5 = SensorNames.Substring(20, 3)
Label7.Text = SN5
End Sub
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