General command of AT instruction set

1 and AT+CGMI give the identification of the module manufacturer.

2.AT+CGMM obtains the module identification. This command is used to obtain the supported frequency bands (GSM 900, DCS 1800 or PCS 1900). When the module has multiple frequency bands, the response can be a combination of different frequency bands.

3.AT+CGMR has obtained the modified software version.

4.AT+CGSN obtains the IMEI (International Mobile Equipment Identification) serial number of GSM module.

5.AT+CSCS selects TE function setting. This command reports the status of setting the use of ME TE. ME can then convert each letter entered or displayed. This is used to send, read or write short messages.

6.AT+WPCS sets the phone book status. This special command reports the status of ME used through TE phone book. ME can then convert each input or displayed string letter. This entrance is used to read or write the phone book.

7.CIMI obtained IMSI. This command is used to read or identify the IMSI of the SIM card. You should enter the PIN code (if required) before reading the IMSI.

8.AT+CCID obtains the identification of the SIM card. This command makes the module read the EF-CCID file on the SIM card.

9.AT+GCAP detection capability table. (Supported features)

10, A/ Repeat the last command. Only the A/ command cannot be repeated. This command repeats the previous command.

1 1 and AT+CPOF are all closed. This special command stops the GSM software stack and hardware layer. The command at +CFUN=0 has the same function as +CPOF.

12, AT+CFUN to set the telephone function. This command selects the functional level of the mobile station.

13, AT+CPAS returns the active state of the mobile device.

14, AT+CMEE reports mobile device error. This command determines whether the result code "+cmeERROR:" or "+CME ERROR:" is allowed to replace the simple "ERROR".

15, AT+CKPD keyboard control. Imitate my keyboard to execute commands.

16, CCLK watch management company. This command is used to set or get the current date and time of my actual clock.

17, AT+CALA alarm management. This command is used to set the alarm clock date/tiME in me. (alarm)

18, AT+CRMP ringtone melody plays. This command plays a piece of music on the buzzer of the module. There are two melodies to choose from: incoming voice, data or fax call melody and incoming SMS sound.

19, AT+CRSL sets or gets the volume of the ringing tone.