Xn Commands
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Commands - Click Here
\Xn
Commands - Click Here
%Xn
Commands - Click Here
OtherXn
Commands - Click Here
(Please note that this is the
basic AT Command set. Many modems do NOT conform to this command
set. However, most of these commands remain the same, or similar from
modem to modem.)
Quickly Referenced Commands
AT - "Attention!"
+++ - "Escape
Sequence"
, -
"Pause"
A/ - "Repeat
Sequence"
ATA - "Answer
Mode"
Bn
- "Select Communication Protocol"
Cn
- "Transmission Carrier"
Dn
- "Dial Control"
En
- "Echo"
Fn
- "Data Mode Echo"
Hn
- "Hook Select"
In
- "Report Modem Information"
Ln
- "Set Speaker Volume"
Mn
- "Set Speaker Mode"
Nn
- "Automode Selection/Detection"
On
- "Retrain Selection"
P - "Pulse
Dialing"
Qn
- "Result Codes to DTE"
Sn=x
- "Status Registers"
T - "Tone
Dialing"
Vn
- "Format of Result Code"
Wn
- "Extended Result Codes"
Xn
- "Result Codes for Call Progress"
Yn
- "Long Space Disconnect"
Zn
- "Soft Reset and Restore"
Verbosely Referenced Commands
AT -
"Attention!" - This command tells the modem that a command
follows it.
+++ - "Escape
Sequence" - This command initiates an escape sequence to return
the modem to the on-line command mode.
, -
"Pause" - The Comma normally initiates a 1-5 second pause,
however is sometimes used as a command separator in +MS and other commands.
A/ - "Repeat
Sequence" - This repeats the previous command. This
command will not function properly if preceded by the AT command or followed by
<CR>.
ATA - "Answer
Mode" - This command initiates the modem into an auto-answer
mode.
Bn
- "Select Communication Protocol" - This command
selects the v.22 or Bell 212A protocols for data calls.
B0
- ITU-T v.22 (300bps or 1200bps)
B1
- Bell 212A (300bps or 1200bps)
(There is sometimes a B2 that enables
v.23)
Cn
- "Transmission Carrier" - This command controls the
switching of the transmit carrier.
C0
- Transmit carrier disabled
C1
- Transmit carrier enabled
Dn
- "Dial Control" - This command dials the phone
number with accordance to the modifiers of n.
DL
- Redial the last dialed number
DP
- Pulse dial
DR
- Enable answer mode
DS=x
- Dial the stored telephone number in x
DT
- Tone dial
DW
- Resume dialing after dial tone is detected
D,
- Pause before dial
D"555-4NET"
- Letters enclosed in quotes will be dialed as their corresponding
numbers on the dialpad.
D!
- Enable "flash". (modem can go off hook for a specified
amount of time before returning on hook)
D@
- Modem will wait for a quiet answer before dialing the rest of the dial
string
En
- "Echo" - This command controls whether the modem
echos commands received by the DTE or not.
E0
- Echo Disabled
E1
- Echo Enabled
Fn
- "Data Mode Echo" - This command controls whether
the modem echos commands sent while in data mode.
F0
- Echo in data mode enabled
F1
- Echo in data mode disabled
Hn
- "Hook Select" - This command determines whether
the modem is on-hook (hangs up) or off-hook (picks up).
H0
- On-hook
H1
- Off-hook
In
- "Report Modem Information" - This command reports
selected information about the modem.
I0
- Modem model and speed
I1
- ROM checksum
I2
- Tests ROM checksum THEN reports it
I6
- Data connection info
I7
- Manufacturer and model info
Ln
- "Set Speaker Volume" - This command controls the
speaker volume of the modem.
L0
- Mute
L1
- Low volume
L2
- Medium volume
L3
- High volume
Mn
- "Set Speaker Mode"
M0
- Disable speaker
M1
- Enable speaker until a carrier signal is detected
M2
- Enable speaker
M3
- Enable speaker after dialing but disable after a carrier signal is
detected
Nn
- "Automode selection/detection" - This command is
usually more basic (a simple N0 for disabled, N1 for enabled) on 56k modems
where automode is more often controlled by an s-register or the +MS
command. The full basic Nn command is included for completeness.
N0
- Disable automode
N1,
N2, N3,
N4, and N5
- Enable automode. Originate mode and Answer mode v.XX attempts will
vary from register to register. The N2-N5
commands will not normally be used by 56k modems.
On
- "Retrain Selection" - Confusing command that
probably should never have been created as it uses an O rather than a 0 and can
often be confused. It enables or disables retraining.
O0
- Retraining disabled in on-line command mode
O1
- Retraining enabled in on-line command mode
P - "Pulse
Dialing" - This command sets the modem to pulse dial.
This command can be duplicated by DP.
Qn
- "Result Codes to DTE" - This command selects
whether the modem sends result codes to the DTE or not.
Q0
- Enable result codes to DTE
Q1
- Disable result codes to DTE
Sn=x
- "Status Registers" - This command writes to or
reads data from S-register n. The data written is represented in the place
of x. The data used in read mode is selected by the value in x.
S-registers can vary a great deal, please consult the AT Command Set specific to
your modem when attempting to use these.
T - "Tone
Dialing" - This command sets the modem to tone dial. This
command can be duplicated by DT.
Vn
- "Format of Result Code" - This command selects the
format for information-text and result codes.
V0
- Numeric format
V1
- Word (verbose) format
Wn
- "Extended Result Codes" - This command enables
selection of extended result codes.
W0
- Enables the CONNECT result codes to report the DTE speed.
W1
- Enables the CONNECT result codes to report the DTE speed.
W2
- Enables the CONNECT result codes to report the DCE speed.
Xn
- "Result Codes for Call Progress" - This command
selects tone detection and result code formatting options.
X0
- Disable busy and dialtone detection. Result codes 0-4 enabled.
X1
- Disable busy and dialtone detection. Result codes 0-5,10 enabled.
X2
- Disable busy detection, enable dialtone detection. Result codes
0-6,10 enabled.
X3
- Enable busy detection, disable dialtone detection. Result codes
0-5,7,10 enabled.
X4
- Busy and dialtone detection enabled. Result codes 0-7,10 enabled.
Yn
- "Long Space Disconnect" - This command tells the
modem whether or not to disconnect if a 1.6 second break is detected.
Y0
- Long space disconnect disabled
Y1
- Long space disconnect enabled
Zn
- "Soft Reset and Restore" - Restores modem profiles
that are saved in non-volatile RAM. Refers itself to the &W command.
Z
- Soft Reset, basic default restore
Z0
- Restore setting 0
Z1
- Restore setting 1
This page was last modified on Saturday, 05-Feb-2011 15:11:07 EST.
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