COMMAND DESCRIPTION
ATA/ Repeat the previous command.
ATA Answer.
ATB0 CCITT operation at 300 or 1200 bps.
ATB1 Bell operation at 300 or 1200 bps (default).
ATD Dial.
ATD0-9 Dial the DTMF digits 0 to 9.
ATDA-D Dial the DTMF digits A, B, C and D.
ATDP Select pulse dialing; effects current and subsequent dialing.
ATDT Select tone dialing; effects current and subsequent dialing.
ATD! Flash: go on-hook by time defined by S29.
ATDW
Wait for dial tone detection before dialing a number. If no dial tone is detected within the time specified by S7, the modem aborts the
rest of the sequence, goes on-hook and generates an error message.
ATD@ Wait for five seconds of silence before proceeding with next dialing string and then complete handshake sequence.
ATD,
Pause. The modem pauses for a time specified by S8 before dialing the number. Most often used when dialing an outside line through a
PBX.
ATD; Return to the command mode after processing the command.
ATE0 Disables the command echo.
ATE1 Enables the command echo (default).
ATH0 Hang up.
ATH1 Forces the modem off-hook.
ATI0 Reports product code.
ATI2 Reports OK (for software compatibility).
ATI3 Reports the firmware version of the modem. Example: CX810801-V90.
ATL0 Sets the speaker volume off.
ATL1 Sets the speaker volume low (default).
ATL2 Sets the speaker volume medium.
ATL3 Sets the speaker volume high.
ATM0 Speaker is always off.
ATM1 Speaker is on during call establishment but goes off when carrier is detected (default).
ATM2 Speaker is always on.
ATM3 Speaker if off during dialing and when receiving carrier but on during answering.
ATQ0 Enables result codes to the DTE (default).
ATQ1 Disables result codes to the DTE.
ATSr Establishes S-register “r” as the default register.
ATSr=n Sets S-register “r” to the value “n.”
ATSr? Reports the value of S-register “r.”
ATV0 Enables short-form result codes.
ATV1 Enables long-form result codes.
ATW0
Upon connection, the modem reports only the DTE speed (for example, CONNECT 9600). Subsequent responses are disabled
(default).
ATW1
Upon connection, the modem reports the modulation type, line speed, the error correction protocol and the DTE speed. Subsequent
responses are disabled.
ATW2 Upon connection, the modem reports DCE speed (for example, CONNECT 2400). Subsequent responses are disabled.
ATX0 Ignores dial and busy tone. Sends CONNECT message when a connection is established by blind dialing.
ATX1
Disables monitoring of busy tones. Sends only OK, CONNECT, RING, NO CARRIER and ERROR messages. If busy tone detection is
enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and
dial tone is not detected, NO CARRIER will be reported instead of NO DIALTONE.
ATX2
Disables monitoring of busy tones. Sends only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIALTONE and CONNECT XXXX. If
busy tone detection is enforced and busy tone is detected, NO CARRIER, will be reported instead of BUSY. If dial tone detection is
Table A.4 Basic AT Commands
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