At 01.34 2005.03.21 -0800, you wrote:
>>> RS-232 (EIA/TIA-232)
>
>> What is exactly the "break condition", by the way?
>
>In asynchronous mode, each "byte" (data payload may vary from
>5 to 9 bits, 8 is most common) is enclosed between a start bit
>and a stop bit.
>
>When idling (no transmission), the line sits at negative voltage.
>A start bit is a positive voltage for 1 bit time.  This is followed
>by the data bits of either voltate.  The byte is terminated by a
>stop bit of negative voltage for 1 bit time or longer.  If the stop
>bit is missing, then the UART will generate a framing error.
>
>A break is when the line is left in the postive voltage level for
>many character times (usually 100ms to 300ms (some old equipment
>had the concept of short breaks and long breaks)) to force an
>exception through the framing error process.  Formerly, it was
>for an out-of-band interrupt from the terminal to the host.

Thanks, now it's all clear, you write like a perfect manual. ;)

>
>						Lee Jones

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