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GPRS attach (AT+CGATT)
In order to use the GPRS service the GSM/GPRS modem must be GPRS attached. From
that moment on the PLMN knows that the GSM/GPRS modem is GPRS capable. This
means the GSM/GPRS modem can initiate a GPRS data call and Mobility Management
routines apply.
Example:
AT+CGATT=1
OK
NOTE
The GPRS attach may already be done before the PDP context and the QoS profile
definition.
PDP context activation (AT+CGACT)
Before data can be transmitted, a PDP context must be activated. One way to do this is the
CGACT command.
Example:
AT+CGACT=1,<cid>
OK
NOTE
More than one context can be activated. If no GPRS attach has been done before, it
will be done automatically by the AT+CGACT command.
Entering the GPRS data mode (AT+CGDATA)
In order to set the GSM/GPRS modem in the GPRS data mode and activate the PPP
stack, the CGDATA command may be used.
Example:
AT+CGDATA=PPP,<cid>
CONNECT
~ }#+!}!}#} }9}”}&} }*} } }’}”}(}”}%}&µ-r#}#}%-#}%*,~~ }#
When the GSM/GPRS modem has answered with CONNECT, it is in PPP mode and no
further AT commands can be sent to the GSM/GPRS modem until the PPP connection
has terminated. The cryptic letter combination displayed after the CONNECT is the ter-
minal interpretation of the PPP traffic.
NOTE
The activation of the drivers necessary to make a TCP/IP connection has to be initi-
ated by the OS. It is the user’s responsibility to adapt the software accordingly and
provide the appropriate drivers.
GPRS AT commands
Summary of Contents for Toughbook CF-18FDNZXVM
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