> > But, as I posted earlier: it does not. After the interrupt caused by the
> > control line change occurs no additional characters will be written to
the
> > PC's UART. However any characters still remaining in the PC's
transmitter
> > shift register, buffer, or FIFO will still come blasting down the wire.
> This
> > could be quite a few characters with deep FIFOs.
>
> OK, I see...then you also have to program the PC to not use the FIFO...it
> does seem a bit silly to use a FIFO on the output if you need to be sure
> that all the characters are accepted at the other end.
>
> /\/\/\/*=Martin

Right, and telling the PC not to use the FIFO can be problematic. I am not
at all sure of the correct incantations, assuming there are such, to do this
under Windows.

I generally send a small packet of data to the PIC and then wait for a
acknowledge before sending the next packet.

It is really the only way to be sure the other end got the data

Bob Amemrman
RAm Systems

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