How to connect this rs232 board to the PI?
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To connect this board to the Raspberry Pi you'll need 4 wires:
GND to ground pin VCC to +3.3V pin TX/RX to the serial RX/TX pins correspondingly CTS/RTS can be happily ignored
Make sure your power supply has enough juice to spare, MAX3232 uses voltage multiplication to achieve RS232C 13V levels, that might require some power.