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14. Set the username and password as defined for your carrier (usually blank).
15. Enter the phone number as *99***1# with no area code and click on Dial.
16. The modem will dial out and attempt to connect.
17. If the configured baud rate for the modem, the COM port, the modem and the DUN do not
match, the DUN will not be able to talk to the modem properly and you will get a hardware error
message. Otherwise the DUN will contact the cellular network and authenticate the user on the
network.
18. Once connected you will be able to browse the Internet through the DUN session. To confirm
this, disable any other network connection you may have running.
GPRS Internet Connection Set Up
Make sure that your SIM is provisioned with GPRS data services. Insert the SIM card, attach the
antenna and serial cable, and power on the unit. Start a HyperTerminal session as described earlier.
The AT^SICS command is used to setup the Internet Connection profile. For a generic setup type
the following commands:
AT^SICS=0,alphabet,1
AT^SICS=0,contype,gprs0
Different carriers may require a specific username, password, or apn to be configured as well.
Check the settings by typing, AT^SICS?. An example output response is shown below;
^SICS: 0,"conType","GPRS0"
^SICS: 0,"alphabet","1"
^SICS: 0,"user",""
^SICS: 0,"passwd","*****"
^SICS: 0,"authMode","PAP"
^SICS: 0,"apn",""
^SICS: 0,"inactTO","20"
^SICS: 1,"conType",""
^SICS: 2,"conType",""
^SICS: 3,"conType",""
^SICS: 4,"conType",""
^SICS: 5,"conType",""
OK
The GPRS connection can be tested with a PING service and the inactivity timer <InactTo>
deactivated (by default, it is set to 20 seconds as shown in the example output). The timer can be
disabled by sending AT^SICS=0,"inactTO",0. Open only the GPRS connection without an
associated service. The connection won't be closed until AT^SICC=0 or closed by the network
because of inactivity (4 hours on Cingular in coverage). Once the connection is open with AT^SICO,
you cannot use AT^SISO or AT^SISC. Services defined with AT^SISS using connection profile 0 will
be immediately opened by typing;
Open the connection by typing, AT^SICO=0
Wait for the "OK" response.
001-0003-829 Revision 1
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