Chapter 2 – Installation
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
ATH
Hang up
OK
AT&W
Store the
parameters in
non-volatile
memory
OK
The communications program has
saved the configuration settings in non-
volatile memory.
Multi-Tech Systems, Inc. MultiModem
®
GPRS with USB User Guide
30