Why i have to use max232 when i want to conect raspberry


Answer the following Question :

Question 1: why i have to use MAX232 when i want to conect Raspberry pi3 with GSM modul SIM808 ???

Question 2: how to set up the serial ports?

Question 3: what dose TTL logic circuit means ?

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Other Engineering: Why i have to use max232 when i want to conect raspberry
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