Confidential, the whole present document is the sole property of Maestro Wireless
Solution Limited.
11
2. Basic operation
Followings are examples of some AT commands. Please refer to the AT command
document for a full description.
Note: Issue AT+CMEE=1 to have extended error code (+CME ERROR)
Description
AT commands
Modem
response
Comments
AT+CREG?
CREG=<mode>,1 Modem registered to the
network
CREG=<mode>,2 Registration lost,
re-registration attempt
Network
registration
checking
CREG=<mode>,0 Modem not registered on the
network, no registration
attempt
Receiving
signal strength
AT+CSQ
+CSQ:20,0
The first parameter has to be
at least 15 for normal
communication
RING
An incoming call is waiting
ATA
Answer the call
Receiving an
incoming call
OK
ATD1234567;
Don’t forget the “;” at the
end for “voice” call
OK
Communication established
CME ERROR : 11
PIN code not entered (with
+ CME = 1 mode)
Make a call
CME ERROR : 3
AOC credit exceeded or a
communication is already
established
ATD 112;
Don’t forget the “;” at the
end for “voice” call
Make an
emergency call
OK
Communication
loss
NO CARRIER
ATH
Hang up
OK
AT+CPIN=1234
OK
PIN Code accepted
+CME ERROR : 16 Incorrect PIN code (with
+CME = 1 mode)
Enter PIN code
+CME ERROR : 3 PIN already entered (with
+CME = 1 mode)
AT&W
Saves
parameters in
non-volatile
memory
OK
The configuration settings
are stored
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