>> With stop bit that's 50/(1+8+1) = 5%
>> That's the error at BOTH ends.

> So you are probably quite safe with 1.7%, and the sources that say 
> up to 3%
> are fine are correct, too. (No hard experience data, though.)

That's presumably 3% at one end and hopefully almost 0% at the other. 
(ie Crystal or resonator at one end).

Two ends with 3% each going in the opposite directions could be bad.


        RM


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