Question: q1: why i have to use MAX232 when i want to conect Raspberry pi3 with GSM modul SIM808 ??? q2: how to set up the

q1: why i have to use MAX232 when i want to conect Raspberry pi3 with GSM modul SIM808 ???
q2: how to set up the serial ports?
q3: what dose TTL logic circuit means ?

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