Chapter 2 – Installation
Multi-Tech Systems, Inc. MultiModem GSM/GPRS User Guide 20
Testing the Configuration Description AT
Commands
Response Returned Comments
AT+CPIN
=1234
OK PIN Code accepted
+CME ERROR : 16 Incorrect PIN Code
Enter PIN Code
+CME ERROR : 3 PIN already entered (with +CMEE : 1
mode)
AT + CREG ? CREG = <mode>, 1 modem synchronized on the network
CREG = <mode>, 2 synchronization lost, re-synchronization
attempt
Module synchro
checking CREG = <mode>, 0 Modem not synchronized on network.
No synchronization attempt
RING
ATA Answer the call.
Receiving an
incoming call
OK
ATD1234; Don’t forget the “;” at the end for “voice”
calls.
OK Communication established
CME ERROR :11 PIN Code not entered (with +CMEE : 1
mode)
Initiate a call
CME ERROR :3 AOC credit (Advice of Charge tells the
user how much a call will cost) has
been exceeded or a communication is
already established.
Initiate an
emergency call
ATD112; OK Don’t forget the “;” at the end for “voice”
calls.
Communication
loss
NO CARRIER
ATHHang up
OK
AT&WStore the
parameters in
non-volatile
memory
OK The communications program has
saved the configuration settings in non-
volatile memory.