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is the connection of a rs232 cable between the module ... between rs232 and max connection between max232 and rs232 max232 to .... Basically all the 3 are transceivers only difference
The ground voltage difference between two circuits may destroy the RS232 ... The output signal of the opto-isolator connects an RS232 level converter, .
for more details
www.edaboard.com/ftopic312382.html - 83k -

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Posted by waqasahmad

The MAX232 was the first IC which in one package contains the necessary drivers (two) and receivers (also two), to adapt the RS-232 signal voltage levels to TTL logic. It became popular, because it just needs one voltage (+5V) and generates the necessary RS-232 voltage levels (approx. -10V and +10V) internally.

The MAX232 is a chip that converts signals from your computers serial port to signals suitable for usage in our circuits. It uses electrolytic capacitors to store and pump up 5V to the +12 and -12V required by the RS232 serial communications protocol (that's what comes out of your PC or USB serial port adaptor).

n telecommunications, RS-232 (Recommended Standard 232) is a standard for serial binary data signals connecting between a DTE (Data terminal equipment) and a DCE (Data Circuit-terminating Equipment). It is commonly used in computer serial ports.

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Posted by sagitraz