L
OW
C
OST
GSM M
ODEM
4.2 Basic AT Command List
The commands in the table below can be used for basic control of the GSM modem.
Description
Network Registration
Checking
AT commands
AT+CREG?
Modem response
CREG=<mode>,1
Comments
Modem registered to the network
CREG=<mode>,2
Registration lost, re-registration
attempt
Modem not registration on the
network, no registration attempt
The first parameter has to be at
least 15 for normal communication
An incoming call is waiting
Answer the call
CREG=<mode>,0
Receiving signal
strength
Receiving an
incoming call
AT+CSQ
+CSQ: 20,0
RING
ATA
OK
Make a call
ATD1234567;
Don’t forget the « ; » at the end for
« voice » call
OK
CME ERROR : 11
Communication established
PIN code not entered (with + CMEE
= 1 mode)
AOC credit exceeded or a
communication is already
established
Cannot read the SIM card
Don’t forget the « ; » at the end for
« voice » call
CME ERROR : 3
CME ERROR : 10
Make an emergency
call
Communication loss
Hang up
Enter PIN code
ATD 112;
OK
NO CARRIER
ATH
OK
AT+CPIN=1234
OK
+CME ERROR : 16
PIN Code accepted
Incorrect PIN Code (with +CMEE =
1 mode)
PIN already entered (with +CMEE =
1 mode)
+CME ERROR : 3
Saves parameters in
non-volatile memory
AT&W
OK
The configuration settings are
stored
DS-GSMT35I-2
Oct ’07
www.rfsolutions.co.uk
©2007
REG No 277 4001, ENGLAND.
Page 9
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