GSM100 U
SERS
M
ANUAL
3.2.
Basic Operation :
Followings are examples of some AT commands. Please refer to the AT Command guide for a full description.
Note : Issue AT+CMEE=1 to have extended error code (+CME ERROR)
Description
Network Registration
Checking
AT commands Modem response
AT+CREG?
CREG=<mode>,1
CREG=<mode>,2
CREG=<mode>,0
Comments
Modem registered to the network
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
Receiving signal
strength
Receiving an
incoming call
AT+CSQ
+CSQ: 20,0
RING
ATA
OK
ATD1234567;
OK
Don’t forget the « ; » at the end for « voice » call
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
OK
NO CARRIER
Make a call
CME ERROR : 11
CME ERROR : 3
CME ERROR : 10
Make an emergency
call
Communication loss
ATD 112;
ATH
Hang up
OK
AT+CPIN=1234
OK
Enter PIN code
+CME ERROR : 16
+CME ERROR : 3
Saves parameters in
non-volatile memory
AT&W
OK
The configuration settings are stored
Incorrect PIN Code (with +CMEE = 1 mode)
PIN already entered (with +CMEE = 1 mode)
PIN Code accepted
DS020-7 Oct ‘06
©2006
REG No 277 4001, ENGLAND.
Page 13
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