Communicate a PC with GPRS module through TCP/IP

I want to exchange data between a PC and a GPRS module.
One problem i have is that my PC is on a local network and the IP my computer has, is the local IP. The server has a different IP through we connect to the internet. Which IP I must use and how?
I know almost nothing about TCP/IP (i have use the Labview TCP/IP functions successfully at our local network) and i would like to ask for informations. I know it is a little irrelevant with Labview, but as there are many users who uses GPRS modules, i would like informations about how to connect a GPRS module through TCP/IP. Simple examples will be the best.
Any informations, links, recommended books, will be highly appreciated.
Thanks

Pnt wrote:
Thanks for answering Rolf.
To be more clear : i have a GSM/GPRS module (like the well known Wavecom's modules (or Falcom, Telit...)). They accept AT commands and they have a D-sub-9 serial connector. They connect to serial port of the PC. I want to connect to the internet with TCP/IP (by sending AT commands). But i can not find any manual..! The module have some commands for TCP/IP but no explanation or examples. Those modems have no drivers, they accept only AT commands.
For example i have to set APN and IP Address which i don't understant what i should write to. It is independant of Labview but i do not know where to look for information.
If someone knows anything similar please reply.
In that case what I wrote applies fully to you. You do not want to communicate with the modem from LabVIEW itself. You want to use TCP/IP and that means using the Windows socket library that the LabVIEW TCP/IP functions access. The modem then needs to be installed in the Windows system as a dialup adapter. There is really no other way to use a modem, GPRS or not, as TCP/IP communication path. Trying to implement TCP/IP,SLIP/PPP and all that in LabVIEW would be a many man year project with lots of problems and the likely chance that it will never fully work.
So get your modem to work under Windows so that you can use your browser to view some internet pages and once that works you can also use the LabVIEW TCP/IP functions to communicate with whatever is there.
Direct communication to the modem through AT commands would only make sense if you wanted to access the SMS facilities in that modem instead. Even that is not exactly trivial as I can attest to, especially if you want to make it work with more than one GSM modem type.
Your modem manufacturer should be able to give you the necessary modem initialisation string to put your modem into the right GPRS mode and your mobile phone network provider should be able to tell you the dialing number to fill in the dialup configuration. No need to do anything else!
As Wiebe explained rasdial.exe would then make it possible to connect to the internet under LabVIEW control.
All in all it's doable but I have spent many hours to get it working last time I did. A few of those were spent waiting on the line for the support persons of the mobile network provider to answer my calls and then playing the ping pong game to get a person that actually knows what a computer is and that it's actually possible to connect a modem to it to use their services.
Rolf Kalbermatter
Message Edited by rolfk on 01-09-2008 06:06 PM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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