User's Manual GSM Terminal GT340
Operation description
4.1.2 AT command guide
Following are examples of some AT commands. Please refer to the “u-blox AT Commands
Manual” for a full description.
NOTE:
Issue “ AT+CMEE=1
↲
” to have extended error code (+CME ERROR), and
“ AT+CMGF=1
↲
” for text mode as preferred message format.
Description
AT commands
Response
Comments
Network
registration
checking
AT+CREG?
+CREG: 0,0
Not registered
+CREG: 0,1
Registered, home network
+CREG: 0,2
Searching operator
+CREG: 0,5
Registered, roaming
Check if PIN is required
AT+CPIN?
+CPIN: READY
PIN not required
+CPIN: SIM PIN
PIN is required
Enter PIN code
AT+CPIN=1234
OK
PIN code accepted
CME ERROR: 16
Incorrect PIN code
Receiving signal
strength
AT+CSQ
+CSQ: 21,99
The first parameter has to
be at least 10 for normal
communication
Receiving an
incoming call
RING
Incoming call
ATA
OK
Answer the call
Make a call,
or make an
emergency call
ATD1234567;
ATD112;
OK
Communication
established
Note: use “ ; ” at the end
for voice call
NO CARRIER
Communication loss
Hang up call
ATH
OK
Call ended
List all SMS messages
AT+CMGL=”ALL”
+CMGL: ...
Lists all SMS messages
Send SMS message
AT+CMGS=”1234567”
↲
>
Initiate sending message,
wait for “ > ”
this is the text
CTRL+Z
+CMGS: 1
OK
Enter the text and issue
“ CTRL+Z “ to send
Set GSM LED
AT+UGPIOC=16,2
OK
Set LED OK
Save parameters in
non volatile memory
AT&W
OK
The configuration settings
are stored
Safe power down
AT+CPWROFF
OK
GSM module OFF
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