4.2 AT COMMANDS
Refer to the following AT Command Set Chart below. This chart
identifies the command function and describes the elements of the
command.
AT Command Sets
AT Command Sets (continued)
A
A/
Bn
Dn
En
Hn
ATB0
ATB1
ATE0
ATE1
ATH0
ATH1
Answer Command
Forces the modem to go off-hook in answer mode
without waiting for a ring.
Repeat Last Commannd
Repeat the last command line it executed. Not
preceded with AT nor followed by pressing the
[Enter] key.
Select ITU-T/BELL Mode
Selects ITU-T operation at 300bps or 1200bps during
Call Establishment . (Default)
Selects BELL operation at 300bps or 1200bps during
Call Establishment.
This command directs the modem to go on-line, dial
according to the string entered and attempt to establish
a connection.
Echo Command
Disables command echo
Enables command echo (Default)
Hang Up the Telephone Line
The modem will release the line if the modem is
currently on-line, and will terminate any test (AT&T) that
is in progress. (Default)
If on-hook, the modem will go off-hook and enter
command mode.
Command
Description
In
ATI0
ATI1
ATI2
ATI3
ATI5
ATI6
Ln
ATL0
ATL1
ATL2
ATL3
Mn
ATM0
ATM1
ATM2
ATM3
Nn
ATN0
ATN1
On
ATO0
ATO1
Identification Command
Reports product code "56000".
Calulates the ROM checksum and reports the least
significant byte of the checksum in decimal.
Calculated the ROM checksum and compares it with
the prestored checksum.
Reports firmware revision (F), basic model (e.g., V34),
application code (A), and interface type code (I)
typically in the form VF,FFF-V34_A1.
Reports Country Code parameter.
Reports modem data pump model and internal code
revision.
Speaker Volume Control
Low speaker volume
Low speaker volume (Default)
Medium speaker volume
Higher speaker volume
Speaker Control
Speaker is always off.
Speaker is on during call establishment, but off when
receiving carrier. (Default)
Speaker is always on.
Speaker is off when receiving carrier and during dialing,
but on during answering.
Set Multi- or Fix- Mode Handshake
Automode detection is disabled.
Automode detection is enabled. (Default)
Return to On-Line Mode
Enters on-line data mode without a retrain. (Default)
Enters on-line data mode with a retrain before returning
to on-line data mode.
P
Qn
Sr=n
ATQ0
ATQ1
ATSr=n
ATS?
Set Pulse Dial
This command forces pulse dialing until the next T dial
modifier or T command is received.
Quiet Results Code Control
Enables result codes to the DTE. (Default)
Disables result codes to the DTE.
Read / Write S-Register
Sets S-Register "r" to the value n.
Reports the value of S-Register r.
Command
Description
7
8