DS-GSMT35I-2

Oct ’07

www.rfsolutions.co.uk

©

2007 REG No 277 4001, ENGLAND.

Page 9

4.2 Basic AT Command List

The commands in the table below can be used for basic control of the GSM modem.

Description

AT commands

Modem response

Comments

Network Registration

Checking

AT+CREG?

CREG=<mode>,1

Modem registered to the network

CREG=<mode>,2

Registration lost, re-registration

attempt

CREG=<mode>,0

Modem not registration 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

Receiving an

incoming call

RING

An incoming call is waiting

ATA

Answer the call

OK

Make a call

ATD1234567;

Don’t forget the « ; » at the end for

« voice » call

OK

Communication established

CME ERROR : 11

PIN code not entered (with + CMEE

= 1 mode)

CME ERROR : 3

AOC credit exceeded or a

communication is already

established

CME ERROR : 10

Cannot read the SIM card

Make an emergency

call

ATD 112;

Don’t forget the « ; » at the end for

« voice » call

OK

Communication loss

NO CARRIER

Hang up

ATH

OK

Enter PIN code

AT+CPIN=1234

OK

PIN Code accepted

+CME ERROR : 16

Incorrect PIN Code (with +CMEE =

1 mode)

+CME ERROR : 3

PIN already entered (with +CMEE =

1 mode)

Saves parameters in

non-volatile memory

AT&W

OK

The configuration settings are

stored