How to use Telit Modem

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Revision as of 17:08, 5 September 2012 by Pau (talk | contribs) (→‎Power up Modem)

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Overview

Telit modem is not supported by default in IGEPv2 Expansion and IGEP Berlin.

Configure

Configure this adding following kernel cmdline parameter 

buddy.modem=yes


Power up Modem

  • Power up the modem using the next commands:
echo 0 > /sys/class/gpio/gpio140/value
echo 1 > /sys/class/gpio/gpio141/value
sleep 1
echo 0 > /sys/class/gpio/gpio141/value
  • Once the modem is on (led near SIM card reader (IGEPv2 Expansion) or , is blinking now), you can interact with it via UART 2. You can use Microcom to comunicate with it from the serial debug console:
microcom -s 115200 /dev/ttyO1
  • To check the modem status use the command:
at
  • Answer should be OK.
  • Now unlock it by inserting your SIM card PIN number. Use the command:
at+cpin=<PIN>
  • If you correctly inserted the PIN number, the answer should be OK. If you fail more than 3 times, your SIM card will lock and you will have to insert PUK number.
  • Now you are ready to use the GSM/GPS modem.


Examples

If you successfully followed the previous instructions, you are ready to test the GSM/GPRS modem. Here are some examples:

You can check the complete list of AT commands at the Official manufacturer Software User Guide.

Test received signal strength

Use the instruction: 

at+csq

The answer should be: +CSQ: X,0, where X is the signal strenght. For example 12 is poor and 18 is good. If the answer is +CSQ:99,99 you should check your coverage or use an antenna


Making a phone call

Use the instruction, replace number_to_call with your number: 

atd number_to_call

Press any key to end call

NOTE: If "NO CARRIER" message appears, check your coverage or use an antenna.

Sending a SMS

First of all, you need to configure the SMS format type. Telit GE865 GSM/GPRS supports PDU format and Text format. We use Text format. Type the following command: 

AT+CMGF=1

There are so many ways in this modem to send a message. Here you have a simple example. Use the instruction, replace destination_number with your number: 

at+cmgs= destination_number
> insert here your text message

When you are ready to send your message use Ctrl+Z to send it.

If you want to cancel or restart the message press ESC.

NOTE: If "NO CARRIER" message appears, check your coverage or use an antenna.

NOTE: Don't use special characters in SMS text message like <`´'">.

Know more

Here you have the official manuals from the manufacturer's webpage:

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