Sending Commands from Visual Basic about IR to Pic

[tne_de]

Hello,
i want to send commands about a Visual Basic (Express 2008) about IR to a pic.
The IR Led is connected with my pc on COM 1.

My VB Code Snippet:

[...]
' Connection to COM1
With serialPort
    .PortName = cbbCOMPorts.Text 'COM1
    .BaudRate = 2400
    .Parity = IO.Ports.Parity.None
    .DataBits = 8
    .StopBits = IO.Ports.StopBits.One
End With
[...]
serialPort.Write(txtDataToSend.Text) 'txtDataToSend = Input txt field

My PBP Code for recipient

main:
serin ir,0,["9999"],dat
    
    IF dat=1 THEN
    led2=turnoff
    led1=turnon
    ENDIF
   
    IF dat=5 THEN
    led1=turnoff
    led2=turnon
    ENDIF
GOTO main

My PBP Code for sender

main:
   SEROUT led5,12,["9999",1]
   PAUSE 100
   SEROUT led5,12,["9999",5]
   PAUSE 100
GOTO main

With this PBP Code it works regarding Pic to Pic communication.
But if I send "99991" or "99995" by my Visual Basic programm it does not work.

I read in the manual that the 12 in the SEROUT command send the data "open inverted" - what does it mean? How could I "open inverted" my command in Visual Basic (Express 2008)?

Best regards

EDIT: Additional Information I use a PIC 12F629