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1. INTRODUCTION TO AT COMMANDS
89
LZT 123 7263 R1C
AT+CMGL=“ALL”
+CMGL: 1,“REC READ”,“+447747008670”,“Matt L”,“02/10/
21,10:07:23+04”,145,4
Test
+CMGL: 2,“REC READ”,“+447747008670”,“Matt L”,“02/11/
19,09:57:28+00”,145,8
Test sms
+CMGL: 3,“REC UNREAD”,“+447747008670”,“Matt L”,“02/11/
19,09:58:06+00”,145,8
Test sms
OK
1.6 GPRS Communication
To initiate a session with the network you need to setup a ‘data account’
on the module, using the AT+CGDCONT command. You need to
specify the correct Access Point Name (APN), which you get from your
service provider. The command below sets up the data account to access
Vodafone’s internet server.
AT+CGDCONT=1,“IP”,“internet”
After this you need to use the ATD command to make a GPRS call. The
example below dials into the network using account number 1 (the
GM47 supports up to 10):
ATD*99***1#
If the module is able to connect to the APN it will return a CONNECT.
At this point PPP/IP packets should be sent by the application, to
negotiate an IP address. The easiest way of doing this whole thing is to
create a windows dial up networking session with the dial string
*99***1# after creating the data account on the module.
It is not possible to call a mobile station using GPRS at present. The
reason for this is that unless a PDP context has been setup it has not been
assigned an IP address by the GGSN/DHCP server and as a result it
cannot be addressed other than through its phone number (defeating the
object of using IP). This is specified in GSM 7.60 or 3GPP 27.060.