user-1: I have GSM modem that has MAX232 interface for RX/TX/GND on three pins.
Is it possible to interface Arduino in some way?
Tnx for help.

user4143: Yes, with another MAX232, or bypass the MAX232 somehow.

-1: <p>I have GSM modem that has MAX232 interface for RX/TX/GND on three pins.
Is it possible to interface Arduino in some way?</p>

<p>Tnx for help.</p>
 4143: <p>Yes, with another MAX232, or bypass the MAX232 somehow.</p>
