Serial communications look like this
<tt>
----- ------------------------------------------
| | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8
-------------------------------------
</tt>
the stop bit is bit 8 in picture above.
it's a bit at the rest voltage and is also the voltage before the first drop, or start bit).
bits 0-7 in between are data bits.
hope this helps



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