DCT e-track, Руководство пользователя, Страница: 64 / 212

4.2. *ENABLING THE UNIT ON GSM AND GPRS
Operation chapter, when using a private APN, devices like e-track
TM
, Cellular Phones, PDAs, PCs, Servers, etc can only be accessed by
devices on the same APN. There are several reasons why a cellular
carrier may use different APNs, but the important thing is that
an
APN is needed for the unit to start a GPRS session , for it
to be able to send and receive data over IP networks. The most com-
mon situation is an APN with Internet access. Any device using this
APN has the ability of communicating with any IP network on the
Internet. Specifically if you are running your Automated Tracking
server on the Internet, this is the kind of APN you need.
An APN has the form of a server name on a dot-separated format
and it is supplied by the cellular carrier.
For example:
this.is.an.apn.com
or
internet.carrier-name.com
Setting the APN on e-track
TM
’s is also done with the
RF
message.
An “empty” APN may be configured too. An empty value is used
when a GPRS session
4
is not desired. For more information refer to
the TAIP reference. The command takes the following form:
To set the APN to internet.carrier-name.com send to the unit:
>
SRFAinternet.carrier-name.com
<
To leave the APN parameter empty:
>
SRFA
<
You can check the GPRS registration status with the
XANS
message
and/or with the Network LED indicator. This LED has to be ei-
ther ON or rapidly blinking when GPRS is up. For more information
consult the TAIP reference and the
LEDS subsection on the About
e-track
TM
chapter.
An APN configuration can be issued at any time and the unit will
start registering to the GPRS network as soon as the GSM registra-
tion process is done and the APN parameter is set.
4
GSM communication only: Voice and/or SMSs
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