AT Command Sets (continued)
AT Command Sets (continued)
T
Vn
ATV0
ATV1
Set Tone Dial
This command forces DTMF dialing until the next P dial
modifier or P command is received.
Result Code From
Enables short-form (terse) result code.
Enables long-form (verbose) result code (default)
Wn
Xn
Yn
Zn
&Cn
ATW0
ATW1
ATW2
ATX0
ATX1
ATX2
ATX3
ATX4
ATY0
ATY1
ATZ0
ATZ1
AT&C0
AT&C1
Connect Message Control
Upon connection, the modem only reports the DTE
speed (e.g., CONNECT 19200). (Default)
Upon connection, the modem reports the line speed,
the error correction protocol, and the DTE speed,
respectively.
Upon connection, the modem reports the DCE speed
(e.g., CONNECT 14400).
Extended Result Codes
The modem ignores dialtone and busy tone when
dialing. Sends standard result codes when a
connection is completed regardless of connection
speed.
The modem ignores dialtone and busy tone. Sends
extended result codes when a connection is mode.
The mode ignores busy tone. Sends "NO DIALTONE" if
no dialtone is detected in 5 seconds of a dial attempt.
Sends extended result codes when a connection is
made.
The mode ignores dial tone. Sends "BUSY" if busy tone
is detected. Sends extended result codes when a
connection is made.
The modem sends "NO DIALTONE" if no dialtone is
detected in 5 seconds of a dial attempt. Sends "BUSY"
if busy tone is detected. Sends extended result codes
when a connection is made, (default)
Long Space Disconnect
Disables long space disconnect. (Default)
Enables long space disconnect.
Soft Reset and Restore Profile
Soft reset and restore profile 0.
Soft reset and restore stored profile 1.
DCD Option
DCD remains ON at all times.
DCD follows the state of the carrier. (Default)
Command
Description
&Dn
&Fn
&Gn
AT&D0
AT&D1
AT&D2
AT&D3
AT&F0
AT&F1
AT&G0
AT&G1
AT&G2
DTR Option
Assumes DTR ON.
Enters command mode on detecting ON-to-OFF
transition of DTR.
Goes ON-HOOK on detecting ON-to-OFF transition of
DTR. (Default)
Resets the modem on detecting ON-to-OFF transition of
DTR.
Restore Factory Configuration (Profile)
Restore factory configuration 0.
Restore factory configuration 1.
Select Guard Tone
Disables guard tone (Default)
Disables guard tone
Selects 1800 Hz guard tone
&Kn
AT&K0
AT&K3
AT&K4
AT&K5
AT&K6
Flow Control
Disables flow control.
Enables RTS/CTS flow control. (Default)
Enables XON/XOFF flow control.
Enables transparent XON/XOFF flow control.
Enables both RTS/CTS and XON/XOFF flow control.
&Pn
AT&P0
AT&P1
AT&P2
AT&P3
Select Pulse Dial Make/Break Ratio
Selects 39%-61% Make/Break ratio at 10 pulses per
second. (Default)
Selects 33%-67% Make/Break ratio at 10 pulses per
second.
Selects 39%-61% Make/Break ratio at 20 pulses per
second.
Selects 33%-67% Make/Break ratio at 20 pulses per
second.
&Qn
&Sn
AT&Q0
AT&Q5
AT&Q6
AT&S0
AT&S1
Select Sync/Async Mode
Selects direct asynchronous operation.
The modem will try to negotiate an error-corrected link.
(Default)
Selects asynchronous operation in normal mode.
Serial Port DSR Control Command
DSR will remains ON at all time (Default)
DSR will become active after answer tone has been
detected and inactive after the carrier has been lost.
Command
Description
9
10