What The AT Command ?
AT commands are instructions used to control a modem. AT is the abbreviation of ATtention. Every command line starts with "AT" or "at". That's why modem commands are called AT commands. Many of the commands that are used to control wired dial-up modems, such as ATD (Dial), ATA (Answer), ATH (Hook control) and ATO (Return to online data state), are also supported by GSM/GPRS modems and mobile phones. Besides this common AT command set, GSM/GPRS modems and mobile phones support an AT command set that is specific to the GSM technology, which includes SMS-related commands like AT+CMGS (Send SMS message), AT+CMSS (Send SMS message from storage), AT+CMGL (List SMS messages) and AT+CMGR (Read SMS messages).
Note that the starting "AT" is the prefix that informs the modem about the start of a command line. It is not part of the AT command name. For example, D is the actual AT command name in ATD and +CMGS is the actual AT command name in AT+CMGS. However, some books and web sites use them interchangeably as the name of an AT command.
Here, You could more learn about AT Command
Here, You could more learn about AT Command
- Introduction AT Command
- Syntax of extended AT Command
- Result Codes of AT Command
- Error Final Result Codes
- AT Command Operations
- Testing the Communication between the PC and GSM/GPRS Modem or Mobile Phone
- Checking if the GSM/GPRS Modem or Mobile Phone Supports the Use of AT Commands to Send, Receive and Read SMS Messages
- Using the AT Command +CSMS to Check if Mobile-originated SMS Messages and Mobile-terminated SMS Messages are Supported
- Checking if the AT Commands Required for Sending, Receiving and Reading SMS Messages are Supported
- Operating Mode: SMS Text Mode and SMS PDU Mode
- Setting or Reading the Service Center Address / SMSC Address (AT+CSCA)
- Preferred Message Storage (AT+CPMS)
- Writing SMS Messages to Memory / Message Storage (AT+CMGW)
- Deleting SMS Messages from Message Storage (AT+CMGD)
- Sending SMS Messages from a Computer / PC Using AT Commands (AT+CMGS, AT+CMSS)
- Reading SMS Messages from a Message Storage Area Using AT Commands (AT+CMGR, AT+CMGL)
