46
SoundExpression
Command Description
Command Character Echo
ATE0
Disables echoing of the
commands to the screen.
ATE1
Enables echoing of the
commands to the screen.
(default).
Disconnect (hang-up)
ATH0
Instructs modem to go on-
hook.
ATH1
Instructs modem to go off-
hook.
Identification
ATI0
Displays the product
identification code.
ATI1
Displays the checksum.
ATI2
Displays ROM checksum as
OK or ERROR.
ATI3
Displays the firmware
revision level.
ATI4
Reports OEM-defined
identifier string.
ATI5
Reports country code.
ATI6
Reports modem data pump
model.
Speaker volume
ATL0
Low volume.
ATL1
Low volume. (default)
ATL2
Medium volume.
ATL3
High volume.
Appendix K: Modem
Command Reference
BASIC AT COMMANDS (default
values are highlighted)
Command Description
AT
Attention characters
ATA
Answer command
ATA/
Re-Execute last command
Dial Modifiers
Dial
Options
Description
ATD
none
Dial. (ATD followed
by phone number)
ATDL none
Re-dial.
ATDP none
Pulse (rotary) dial. 10
pulses per second.
ATDT none
Touch tone dial
(DTMF).
ATDW 1-255sec
Wait for dial-tone.
Default is 50 seconds.
ATD,
0-255sec
Pause. Default is 2
seconds.
ATD@ none
Wait for quiet answer.
ATD!
none
Initiate hook flash.
ATD;
none
Return to command
state after dialing.
ATD^ none
Disable calling tone.
ATDS=0-3
none
Dial stored number.
(See AT&Z).
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