LMU-2x20™ Hardware and Installation Guide
V1.0.10
December 12, 2010
Copyright ©Calamp Wireless Networks Inc 2010
- 27 -
CalAmp Proprietary & Confidential
3.8
Activating a GSM LMU using AT Commands
For a GSM/GPRS operator
3
you will get the LMU in one of two varieties, one with a SIM
and one without.
If you get an LMU without a SIM (which is the typical case) the operator will simply ask for
the IMEI of the LMU. The IMEI (International Mobile Equipment Identifier) is printed on
the bottom of the LMU under the LMU’s ESN. Again,
DO NOT give the operator the
ESN
of the LMU.
The operator will provide you with a SIM for each account activated. If they are especially
nice (or you are especially persistent) they will also give you a list tying the IMSI
(International Subscriber Identifier) of the SIM to the phone number assigned to it. Please
note that the operator will likely tie the IMSI (i.e. the SIM) to a specific IMEI. Making sure
the specific SIM matches to the right IMEI isn’t strictly necessary, but it will keep everyone’s
book-keeping a little cleaner. You may also obtain this information by running a CSV report
in PULS (after the devices have connected to the network and sent in their first ID Report).
See the PULS Users Guide for more information.
If you do happen to have a SIM, the operator will ask for the IMSI and ICC-ID (Integrated
Circuit Card Identifier) along with the IMEI of the LMU. Again, in return you should get a
list of IMSIs and Phone Numbers.
The IMEI, IMSI and ICC-ID are all available through the
ATI1
command. The IMEI
should also be printed on the bottom of the LMU.
You should also get an APN (Access Point Name) value. The APN is the device on the
network that allows a GPRS device (i.e. the LMU) to get to the internet. They tend to look
like a URL, for example:
myAPN.myOperator.com
Operators can offer more than one type of APN and can even set up a custom APN just for
your devices
4
. The rates they charge will vary depending on the APN service you want.
Operators may also request you use a blank APN. With the APN, you should also receive a
username and password combination.
3
Trivia time… GSM is dominant in Europe and networks are run by Operators, not carriers. Carriers, at least in a
European sense, refer to the rats that carried the black plague.
4
It is important to note that the operator may charge more to access certain APNs.
