AT COMMAND TRAINING

The mobile equipment returns the list ofparameters and value ranges set with thecorresponding Write command or by internalprocesses
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AT COMMAND TRAININGAT Command Training Steven Li March, 2007 Agenda• AT Command Overview• Voice Call / CSD AT Command• GSM 07.07 AT Command• SMS AT Command• GPRS AT Command• AT Command Special for SIMCOM 2 Agenda• TCP/IP AT Command 3 Type of Extended AT CommandTest CommandAT+=?The mobile equipment returns the list ofparameters and value ranges set with thecorresponding Write command or by internalprocesses 4 Type of Extended AT CommandRead CommandAT+?This command returns the currently setvalue of the parameter or parameters. 5 Type of Extended AT CommandSet CommandAT+=This command sets the user-definableparameter values. 6 Type of Extended AT CommandExecution CommandAT+The execution command reads non-variable parameters affected by internalprocesses in the GSM engine. 7Commands according to GSM07.07• AT+CSQ• AT+CREG• AT+COPS• AT+CPIN• AT+CLCK• AT+CPWD 8 Commands according to GSM07.07AT+CSQ Signal Quality ReportTest command ResponseAT+CSQ=? +CSQ: (list of supported s),(list of supported s)Execute command ResponseAT+CSQ +CSQ: , +CME ERROR: Execution command returns received signal strength indication and channel bit error rate from the ME. Test command returns values supported by the TA. Parameters : 0 ‑113 dBm or less 1 ‑111 dBm 2...30 ‑109... ‑53 dBm 31 ‑51 dBm or greater 99 not known or not detectable (in percent): 0...7 as RXQUAL values in the table in GSM 05.08 [20] subclass 8.2.4 99 not known or not detectableReference NoteGSM 07.07 [13] 9Commands according to GSM07.07 AT+CREG Network Registration 10Commands according to GSM07.07 AT+CREG Network Registration Example 11Commands according to GSM07.07 AT+COPS Operator Selection 12 Commands according to GSM07.07 AT+COPS Operator SelectionWrite CommandAT+COPS=,, Example 13 Commands according to GSM07.07AT+CLCK Facility Lockto lock phone to sim card, to lock sim card (PIN), etcAT+CLCK=, , AT+CPWD Password ChangeAT+CPWD=, , AT+CPIN Enter PinAT+CPIN? to check whether some password is required or notAT+CPIN= 14 Commands according to GSM07.07 EXAMPLES1. I have a sim card whose PIN number is 1234, and I want to lock it.2. Restart the module, and check whether some password is required.3. PIN number is needed.4. I want to change the password from 1234 to 56785. Restart the module, and I need enter new PIN number this time.6. I want to unlock the sim card, which means the next time the module restart, PIN number is not needed. 15 VOICE CALL / CSDExecute command ResponseATD[][0 When TA returns to command mode after call release OK If connection successful and voice call OK Parameter string of dialing digits and optionally V.25ter modifiers dialing digits: 0-9, * , #, +, A, B, C Following V.25ter modifiers are ignored: ,(comma), T, P, !, W, @ Emergency call: Standardized emergency number 112(no SIM needed) string of GSM modifiers: I Actives CLIR (Disables presentation of own number to called party) i Deactivates CLIR (Enable presentation of own number to called party) G Activates Closed User Group invocation for this call only g Deactivates Closed User Group invocation for this call only only required to set up voice call , return to command state ...