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MSP430F5529: How to translate the output voltage of MSP430F5529 and apply it to SIM900A ?

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Hi , I am interfacing MSP430F5529 and SIM900A using energia software. I have tried the code using Arduino Uno before and it seemed to work fine. However when I try the same with msp430 , there is no output on the serial monitor. Few days back I came to know that there is a voltage mismatch between the msp430 output and sim900 input and as suggested by few members of the thread , I am supposed to use a voltage translator to convert the 3.3V output of the Msp430 board and then apply it to sim900A module. They recommended Rs232 for this purpose .

 

I want to know the connection that'll be required to made in order to translate the voltage of the msp430. Where do I connect the rs232 cable and where do I apply it's output voltage ?

 

Thank you .

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