> 
> I could be out of date with this but RS-232 specs I have used 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.
> I would put a scope there to see.
> 
> John Ferrell    W8CCW


+3 to -3 volts is invalid.  -15 to -3 is logic 1, +15 to +3 is logic 0.

Tony

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