Using the Telit GE863 (GSM-GPRS module)

Step 2: Communication

You might be inclined to think you could hook up a USB cable to the USB port on the interface board, but that is actually the GPS line and cannot be used to communicate with/ program your board. Instead, you can use the RX/TX lines which are located on the pins labelled C103/TXD and C104/RXD (see
gure, pins on the left).

For the breakout board, you can connect the wires from your MTA jack to GND, VBATT, TXD and RXD respectively, clockwise from top right. The VBATT and GND pins are all connected internally, so you only need to have the power lines connected in one of the pins. Pick however you want to insert your headers.

RX/TX over USB cable
To make the cable you want to have a TTL-232R serial converter USB cable which you really only use 3 of the wires from. The serial connector on the breakout board is the connected as follows: (empty, black, orange, yellow)

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Z-term and settings
You need some kind of serial communication terminal to talk to the telit. We used Z-term, it's freely available, you could also use minicom. The telit uses a data rate of 115200, 8 bits, no parity. Hardware handshake should be o for talking to the telit through the breakout board, if you are using the evaluation kit then hardware handshake should be on. You can set these in Z-term under Connection > Settings.

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Turning the board on will result in the status led blinking rapidly (once every 2s) when searching for networks and less rapidly (4s) if it has found one. When you connect the board and it is on, you should receive the message ATE1 V1 OK. It will respond to the typed command AT with OK.