| READ | Ответ | WRITE | Ответ | Описание |
| AT+CSMINS? | +CSMINS: 0,0 (0,1) OK | AT+CSMINS=n (n=1 / 0 ) | Сим карта вставлена? | |
| AT+GSV | SIMCOM_Ltd SIMCOM_SIM900 Revision: | Revision | ||
| ATI | SIM900 R11.0 | Product INFO | ||
| AT+CBC | +CBC: 0,52,3760 OK | BATTERY | ||
| AT+CPOWD=1 (normal) | POWER DOWN | |||
| AT+CPAS | +CPAS: 2 | 0 - готов 2 - неопределен 3 - входящий вызов 4 - исх. вызов |
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| AT+CREG? | +CREG: 0,0 (0,2) OK | |||
| AT+CSQ | +CSQ: 4,0 OK | LEVEL (0-31 or 99) | ||
| AT+CCLK? | +CCLK: "00/01/01,01:15:12+00" OK | AT+CCLK="12/05/01,14:40:12+02" | TIME | |
| ATD+7916650****; | NO DIALTONE NO ANSWER | +CPAS: 4 при вызове | ||
| ATH | Дисконнект | |||
| ATZ | RESET DEFAULT | |||
| AT+CSCLK? | +CSCLK: 0 | AT+CSCLK=0,1,2 | OK | SLEEP (1-DTR; 2-COM) |
| AT+SGPIO=? | +SGPIO: (0-1),(1-12),(0-2),(0-1) | AT+SGPIO=0,12,1,1 | Out, 12port, Out, '1' | I/O, N, I/O/Key, Value |