Important AT commands.
Here is a list of some important AT commands for the A2D-1 / A2D-3.
Commands concerning modem hardware:
| AT+CGMI | Gives manufacturer information. |
| AT+CGMM | Gives GSM model information. |
| AT+CGMR | Gives firmware revision information. |
| AT+CGSN | Gives the IMEI number. |
Network registration commands:
| AT+CPIN? | Gives the PIN status information. - READY = Modem is not pending for any password. - SIM PIN = Modem is waiting for SIM PIN to be given. - SIM PUK = Modem is waiting for SIM PUK to be given. |
| AT+CREG? | Show the network registration status. |
| AT+COPS? | Show the current PLMN. |
| AT+CSQ | Show the current field strength. Normal operation: 7 to 31. |
Serial link control commands:
| ATE[<n>] | n = 0: Echo off, n = 1: Echon on |
| ATQ[<n>] | n = 0: Result codes on, n = 1: Result codes off |
| ATV[<n>] | n = 0: Response text off, n = 1: Response text on |
| AT&C[<n>] | n = 0: DCD olways on, n = 1: DCD state of carrier |
| AT&D[<n>] | n = 0: DTR ignored, n = 1: Enter command state, n = 2: Call clear down |
| AT+IPR=<rate> | Set baudrate <rate> |
| AT+ICF=[<format>][,<parity>] | Set data format and parity |
| AT+IFC=<DCE>,<DTE> | Set flow control |
Call control commands:
| ATD<number>; | Establish a voice call |
| AT+VGR=<n> | Set amplification of the microphone, n = 0 to 23 |
| AT+VGT=<n> | Set amplification of the speaker, n = 0 to 20 |
| ATD<number> | Establish a data call |
| ATA | Accept an incoming call |
| ATS0=<n> | Set auto answer after n calls |
| ATH | Hang up |
| AT+VTS=<tone> | Transmit a DTMF tone, range 0 to 9, A to D, #, * |
| AT+VTD=<n> | Set length of the DTMF tone n = 0,1 Second |
| +++ | Switch to command mode |
| ATO | Switch to online mode |
| AT+CBST=[<speed>],0[,<ce>] | Set bearer service type and mode |
For further details, downlod the full specification here. (PDF format, 582 kBytes)
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