vt220 question

From: der Mouse <mouse_at_Rodents.Montreal.QC.CA>
Date: Tue May 4 13:30:40 2004

> A "BREAK" in RS232 is a "signal" at least in the sense that most
> receiving hardware can detect it and do "special things" upon
> receipt. I am going from foggy memory, but as I recall, a break is a
> long space or mark, longer than any valid word format timing would
> normally indicate with no logic state changes inbetween.

Yes. A break condition can be thought of as a very long start bit,
extended for at least ten bit times (and usually a good deal longer) -
I'm not sure what the exact spec is. Indeed, I've seen software
documentation that speaks of generating breaks by changing the speed
and sending 0x00 characters.

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Received on Tue May 04 2004 - 13:30:40 BST

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