Hi,

I need to create a program that sends & receives data via rs232.
I have done it many times in VB6 with easy.

Why is so hard in vs2008?

I managed to send (or so I think).
Because I can see the LEDs flashing on my board connected to the pc.
But I do not get any response back from the board.

The reason I do it in vs2008, is because I need the program to run on a PDA.
But to understand how rs232 works in vs2008, I just created a simple program for the pc to talk to my board.

for example, I send:
Code:
SerialPort1.Write(Chr(2) & "I" & Chr(3))
and I expect back (into a textbox), a hex string 25 characters long.

The board also send data to rs232 sometimes, without me requesting it.

How do I do it?

Thanks.