Modes Of Operation; Gsm Modules Without Tcp/Ip Stacks; Running Gprs Through Windows - Sony Ericsson GPRS and TCP-IP with the SEM GSM modules Application Note

Using GPRS and TCP/IP stack with SEM GSM modules

3 Modes of operation

When using GPRS with the SEM modules some units have an embedded
TCP/IP stack others do not, theses are listed below:-
Units without the TCP/IP stack
Units with the TCP/IP stack

3.1 GSM modules without TCP/IP stacks

These modules have limited functionality in that they will provide
communications across the network to the APN but the rest of the protocol
stack needs to be provided by the application.
The sequence of events
1. Create a data account using the at+cgdcont command i.e.
at+cgdcont=1,"IP","internet". This hold the necessary information
required to make a GPRS 'call'.
2. Make a GPRS call using the standard dial command but using the dial
string *99***1#
3. Once the unit has connected through to the APN correctly it will return
a CONNECT message and enters V.250 online data mode.
4. At this point the application needs to initiate a PPP/TCP/IP
conversation.
More details of the protocols and procedure used are available in GSM
7.60 or 3GPP 27.060.

3.1.1 Running GPRS through Windows

The fastest way to see how GPRS operates with a TCP/IP stack is to run
it against windows. To do this use the following steps.
1. Power the unit up and create a data account using the command
at+cgdcont=1,"IP","XXXXXX"
Where XXXXXX is the internet APN for the network you are using
LZT 123 7699 R1A
- GM29
- GM41
- GM47/GM48
- GR47/GR48
- GT47/GT48
7