On Fri, 2007-01-12 at 20:25 -0500, John Ferrell wrote:
> I could be out of date with this but RS-232 specs I have used in the past go 
> from a + level to a -level. 0 volts is an invalid condition.

Very true. Although much hardware will except 0 volts as a "high" (RS232
being inverted, a -ve voltage is considered "high", a +ve voltage is
considered low), I'd never let a device out of my hands that didn't
swing into the negative region properly. It's just begging for problems,
perhaps not today, but down the road.

TTYL

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