4.2. *ENABLING THE UNIT ON GSM AND GPRS
is used as follows:
To set the PIN number
1234
send to the unit:
>
SRFI1234
<
To set an “empty” PIN:
>
SRFI
<
Use the
Q
qualifier to consult.
A PIN configuration can be issued at any time but although the
registration process is always done automatically, the unit will take
up some time on registering to the GSM network when a previous
erroneous PIN was given or when no PIN was not given. So it is rec-
ommended in those cases to reset the unit after the PIN-set command
with the
>
SRT
<
reset message. Or better, have the PIN correctly con-
figured before the SIM card is inserted.
e-track
TM
’s
does not block a SIM card when the given PIN is
wrong.
Note:
The GSM registration status can be consulted with the
RP
message
and/or with the
Network
LED indicator. For more information con-
sult the TAIP reference and the
LEDs
subsection on the
About
e-
track
TM
chapter.
When the unit is GSM-registered it is able to make or receive tele-
phone calls and to have 2-way SMS communication.
The PIN parameter can not be changed over the air. This to
prevent the unit from loosing the GSM/GPRS network when an
incorrect PIN is tried remotely. The PIN value can only be mod-
ified over the USB communications’ port.
Note:
4.2.2
Access Point Name (APN) for GPRS set up
A GPRS session enables the unit to communicate with IP networks
(IP addresses). Although the most common IP network is the Inter-
net, by specifying an APN the cellular carrier can enable your unit(s)
to work on a user-private IP network that does not
necessarily
com-
municate with the Internet. Among other advantages discussed on the
61
