On Feb 19,  9:41, Bryan Crotaz wrote:
} Subject: Serial
> Nope, Andy I meant no stopbit.
> What effect does putting a stop bit in have on the reliability?
>
> Bryan
>
> (PS It's extremely easy to add one to the routine.)
>


I hope I'm not butting in and grabbed the wrong end of the stick. I
assume RS232 style comms are under discussion.

The stop bit is required for two reasons that I can think of:

* Timing considerations (the data word is expected to be, say, 10 bits
long)

* Ensuring correct start bit detection. The stop bit is high and the
next start bit is low, thus providing a reliable transition.

Adding extra stop bits (more than one) can't harm things because the
stop bit value is the same as the idle state. Obviously it can knock
performance a bit.

-- Charles