YES. If there is a max232 on one your gsm module, you should include on in your microcontroller board also. The following image might give you an idea about it
Go through the data sheet of max232 and connect the pins correctly
YES. If there is a max232 on one your gsm module, you should include on in your microcontroller board also. The following image might give you an idea about it
Go through the data sheet of max232 and connect the pins correctly