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Micro controllers work on CMOS logic where the voltage levels are 0 & 5volts or 0 & 3.3 volts, whereas RS 232 protocols define voltage levels to be +12v & -12v.

http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Serial-Communication-Basic.html

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Q: Why micro controller doesn't accept RS-232standards?
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