I just received my GMS 862 Evaluation Board and here is how I managed to send my first SMS message (by reading this article and some trial and error):
- Install the Virtual Com Port Driver (if you’ve already not done that) to be able to use USB to communicate with the board.
- Connect the board to the USB port on your Mac. The red light on the board will light up indicating that it is getting power.
- On the Mac, start the Terminal application
- Find out the “name” for the serial port: issue the command
ls /dev/tty.* - The name will be something like
/dev/tty.usbseria;-A80081n2 - Start a serial session by using the
screenapplication: issue the commandscreen /dev/tty.usbseria;-A80081n2 115200. To end the screen session entercontrol-a \ - Start the GSM module (this is critical, if you don’t start it up then anything you type on the screen session simply wont show up and the AT commands will, of course, wont be sent to the GSM module. You can start up the module, by pressing and holding the little start button on the evaluation board for at least 1 second.
- Issue the following 3 AT commands:
AT+CMGF=1
OK
AT+CMGW="+14081234567"
> HELLO WORLD!
+CMGW: 1
OK
AT+CMSS=1
+CMSS: 3
OK
The command AT+CMGF=1 will format SMS as a TEXT message.
The command AT+CMGW provides the phone number you wish to send the SMS message to. When you hit enter, the GSM module responds with >. Now you can enter your text message and you terminate it with control-z. The message is read into memory and the module replies with the message index.
The command AT+CMSS=1 sends the SMS message with the specified index.
Here is an excellent introduction to the SMS AT commands.
