I have mounted on the GSM add-on v2.0(sim 800) on the pi. I have read the AT commands manual but don't know how to initialize the serial connection between both of them till the point AT commands have to be entered. I can't find any information online. Any information will be greatly appreciated.

  • To initiate GPRS transmission you will need to use PPTP software, over the serial connection. Like an old modem, read up about that.(The phone number is *9***1) To do fancy things, like signal triangulation, sending SMS and maybe even placing calls, then you use the AT commands, over serial. You can use screen but wire up like John La Rooy suggests, using the hardware serial pins.
    – Piotr Kula
    Feb 16 '16 at 21:45

If you use a recent version of raspi-config, you will find there is an option to prevent taking over the serial port as a console.

Then it is free for you to use as a regular serial port


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