Multi-Tech Systems MTCBA-G-F1 manual Testing the Configuration, AT + Creg ?

Chapter 2 – Installation

Testing the Configuration

Description	AT	Response Returned	Comments
	Commands
	AT+CPIN	OK	PIN Code accepted
Enter PIN Code	=1234
		+CME ERROR : 16	Incorrect PIN Code
		+CME ERROR : 3	PIN already entered (with +CMEE : 1
			mode)
	AT + CREG ?	CREG = <mode>, 1	modem synchronized on the network
Module synchro		CREG = <mode>, 2	synchronization lost, re-synchronization
			attempt
checking		CREG = <mode>, 0	Modem not synchronized on network.
			No synchronization attempt
Receiving an		RING
incoming call	ATA		Answer the call.
		OK
	ATD1234;		Don’t forget the “;” at the end for “voice”
Initiate a call			calls.
		OK	Communication established
		CME ERROR :11	PIN Code not entered (with +CMEE : 1
			mode)
		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	ATD112;	OK	Don’t forget the “;” at the end for “voice”
emergency call			calls.
Communication		NO CARRIER
loss
Hang up	ATH
		OK
Store the	AT&W
parameters in		OK	The communications program has
non-volatile			saved the configuration settings in non-
memory			volatile memory.

Multi-Tech Systems, Inc. MultiModem GSM/GPRS User Guide 20