Flushing a serial port - How to do??

[Rodnebb]

I open a COM port on a cFP, then run VISA Flush IO Buffer.

I would now have thought that the buffer is empty - that is that there are now no more bytes at port and a read operation will not read anything.

I have read here somewhere that both the VISA open event and the Flush would empty the buffer.

This is not the case - there are lots of bytes at the port after the flush event - can anyone tell me how this is done correctly?

Thx!

Message Edited by Rodnebb on 02-06-2008 06:43 PM

[JohnBoy]

Have you set a mask value for the VISA Flush I/O Buffer? Use a mask of 144 to flush both the Receive and Transmit buffers.

[Rodnebb]

but.. why flush the transmit buffer - I don't transmit anything to this device, I'm only listening. I've tried both receive buffer flush methods.

[JohnBoy]

Well, if you've used the flush buffer correctly and more bytes keep arriving, they must be being continuously transmitted.