rs232 and waiting on receive to send

[Blokker1999]

Hello,

I am new to VB.net and I am trying to write a program to interface with a device. I have most of the protocol documented. Thanks to this forum I am already able to send information to the device, but I am unable to do it automated.

The problem is that you have to send the information one byte at the time and wait for the device to answer, if you send all the information at once the device simply sends an error code back instead of the go ahead.

So how do I send one byte and then wait for the correct response before I can send the next one?

[Plater]

Program logic?

SendMesage()
{
   while(stillOKToSend)
   {
      Send one byte
      Wait for Response
      validate response
      if message=done then stilloktosend=false
   }
}