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Posted by Conrad, on Jul-2009,
1. Remember RS232 is inverse...
the RS232 levels are not only not the same as those of your micro/cpu logic, but they are inverted. If you use a MAX232 chip or similar, it will do all the work for you. 
 
The inverting is perhaps confusing, but since the micro side is "correct" it is easy to program.
 
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