Herbert Graf wrote:
> 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 I could be out of date with this but RS-232 specs I have used in the past go 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.
>
>   
The published RS232 standard has the minimum swing at -3V.

--Bob
> TTYL
>
>   

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