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The RS-232 is simply a series of standards for serial data transmission, while the MAX232 is one of many available RS-232 standard compliant transceivers intended for implementing an RS-232 interface.
Main difference between two is the voltage levels of the rs232 are higher. In order to reduce those voltage means to convert those voltage levels to TTL logic levels we use max232 integrated chip which is a dual driver/ receiver.
read this :- https://sigma-shop.com/manuals/max232_manual.pdf
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