AT Command Format
=================
When issuing AT commands, you must abide by the following syntax conventions:
* A command line consists of a prefix, body, and terminator. Each command
line must begin with "AT" (except A/, A> and +++).
* AT commands must be terminated by a carriage return (except A/ and A>).
* Commands entered upper or lower case are accepted.
* The body is a string of commands restricted to printable ASCII characters
(032 - 126).
* Space (ASCII 032) and control characters other than CR (ASCII 013) and BS
(ASCII 010) in the command string are ignored.
* The default terminator is the ASCII <CR> character. Characters that
precede the AT prefix are ignored.
* Missing decimal parameters (n) are assumed as 0.
* The modem recognizes the backspace character for editing. When echo is
enabled, a backspace or delete is echoed a backspace character, a space
character, and another backspace. The code used for the backspace character
is programmable through register S5. Values equal to 0 or greater than 32,
or the carriage return character value, cannot be used for the backspace
character.
* The AT sequence may be followed by any command sequence, except for ATZ
(reset), ATD (dial), or ATA (answer). Commands following these commands on
the same command line are ignored.
* The maximum number of characters on any command line is 60 (not counting
the initial "AT").
* If a syntax error is found in a command, the remainder of the line will be
ignored and an ERROR code will be returned.
* Most commands entered with parameters out of range will not be accepted and
the ERROR response will be returned to the DTE.
* The next command will only be accepted by the modem once the previous
command has been fully executed.
* Execution of commands D and A, either as a result of a direct command or a
re-execute command, will be aborted if another character is entered before
completion of the handshake.
Command Quick Reference
-----------------------
&$ HELP, Ampersand Commands Mn n=0 Speaker Off
A/ Repeat Last Command n=1 Speaker On Until CD
A> Continuously Repeat Command n=2 Speaker Always On
AT Command Mode Prefix n=3 Speaker Off During Dial
A Answer Call On n=0 Return Online
Bn n=0 V32 Mode/CCITT Answer Seq n=1 Return Online & Retrain
n=1 Bell Answer Seq P Pulse Dial
Dn Dial a Telephone Number Qn n=0 Result Codes Sent
n=0..9#*TPR,;"W@!()- n=1 Quiet (No Result Codes)
DL Dial Last Phone Number n=2 Verbose/Quiet On Answer
DSn Dial Stored Phone Number Sr=n Sets Register "r" to "n"
D$ HELP, Dial Commands Sr? Query Register "r"
En n=0 No Command Echo S$ HELP, S Registers
n=1 Echo Command Chars T Tone Dial
Fn n=0 Online Echo Vn n=0 Numeric Responses
n=1 No Online Echo n=1 Verbal Responses
Hn n=0 On Hook (Hang Up) Xn n=0 Basic Result Codes
n=1 Off Hook n=1 Extended Result Codes
In n=0 Product Code n=2-4 Advanced Result Codes
n=1 Checksum Yn n=0 Next reset to &W0 settings
n=2 RAM Test n=1 Next reset to &W1 settings
n=3 Product ID string n=2 Next reset to &F0 settings
n=4 Current Settings n=3 Next reset to &F1 settings
n=5 NVRAM Settings n=4 Next reset to &F2 settings
n=6 Link Diagnostics Zn n=0 Software Reset
n=7 Product Configuration n=1 Reset to &W0 settings
n=10 VXD Configuration Screen n=2 Reset to &W1 settings
n=11 V.34 Link Screen n=3 Reset to &F0 settings
Ln n=0 Lowest Speaker Volume n=4 Reset to &F1 settings
n=1 Low Speaker Volume n=5 Reset to &F2 settings
n=2 Medium Speaker Volume +++ Escape Code
n=3 High Speaker Volume $ HELP, Command Summary
Dial Commands (See Dn in the Command Quick Reference)
------------------------------------------------------
0-9 Digits to Dial
* Auxiliary Tone Dial Digit
# Auxiliary Tone Dial Digit
T Tone Dialing
P Pulse Dialing
R Call an Originate Only Modem
, Pause (Wait for S8 Time)
; Remain in Command Mode After Dialing
" Used to Dial Alpha Phone #'s
W Wait for 2nd Dial Tone (X2,X4)
@ Wait for an Answer (X3-X4)
! Flash Switch Hook
Ampersand Commands
------------------
&An n=0 Disable /ARQ Result Codes &Pn n=0 N.American Pulse Dial
n=1 Enable /ARQ Result Codes n=1 UK Pulse Dial
n=2 Enable /Modulation Codes &Rn n=1 Ignore RTS
n=3 Enable /Extra Result Codes n=2 RX to DTE/RTS high
&Bn n=0 Reserved &Sn n=0 DSR Always On
n=1 Fixed DTE Speed n=1 Modem Controls DSR
n=2 Reserved &Tn n=0 End Test
&Cn n=0 CD Always On n=1 Analog Loopback (ALB)
n=1 Modem Controls CD n=3 Digital Loopback (DLB)
&Dn n=0 Ignore DTR n=4 Grant Remote DLB
n=1 On-Line Command Mode n=5 Deny Remote DLB
n=2 DTE Controls DTR n=6 Remote Digital Loopback
&Fn n=0 Load Factory Configuration n=7 Remote DLB With Self Test
n=1 Hardware Flow Control Cnfg. n=8 ALB With Self Test
n=2 Software Flow Control Cnfg. &Un n=0 Variable link rate floor
&Gn n=0 No Guard Tone n=1 Minimum link rate: 300 bps
n=1 550 Hz Guard Tone n=2 Minimum link rate: 1200 bps
n=2 1800 Hz Guard Tone n=3 Minimum link rate: 2400 bps
&Hn n=0 Disable TX Flow Control n=4 Minimum link rate: 4800 bps
n=1 CTS n=5 Minimum link rate: 7200 bps
n=2 Xon/Xoff n=6 Minimum link rate: 9600 bps
&In n=0 Disable RX Flow Control n=7 Minimum link rate: 12000 bps
n=1 Xon/Xoff n=8 Minimum link rate: 14400 bps
n=2 Xon/Xoff Chars Filtered n=9 Minimum link rate: 16800 bps
n=3 HP Enq/Ack Host Mode n=10 Minimum link rate: 19200 bps
n=4 HP Enq/Ack Terminal Mode n=11 Minimum link rate: 21600 bps
n=5 Xon/Xoff for non-ARQ Mode n=12 Minimum link rate: 24000 bps
&Kn n=0 Disable Data Compression n=13 Minimum link rate: 26400 bps
n=1 Auto Data Compression n=14 Minimum link rate: 28800 bps
n=2 Enable Data Compression n=15 Minimum link rate: 31200 bps
n=3 Selective Data Compression n=16 Minimum link rate: 33600 bps
&Mn n=0 Normal Mode n=17 Minimum link rate: 28000 bps
n=4 ARQ/Normal Mode n=18 Minimum link rate: 29333 bps
n=5 ARQ Mode n=19 Minimum link rate: 30666 bps
&Nn n=0 Highest Link Speed n=20 Minimum link rate: 32000 bps
n=1 300 bps n=21 Minimum link rate: 33333 bps
n=2 1200 bps n=22 Minimum link rate: 34666 bps
n=3 2400 bps n=23 Minimum link rate: 36000 bps
n=4 4800 bps n=24 Minimum link rate: 37333 bps
n=5 7200 bps n=25 Minimum link rate: 38666 bps
n=6 9600 bps n=26 Minimum link rate: 40000 bps
n=7 12000 bps n=27 Minimum link rate: 41333 bps
n=8 14400 bps n=28 Minimum link rate: 42666 bps
n=9 16800 bps n=29 Minimum link rate: 44000 bps
n=10 19200 bps n=30 Minimum link rate: 45333 bps
n=11 21600 bps n=31 Minimum link rate: 46666 bps
n=12 24000 bps n=32 Minimum link rate: 48000 bps
n=13 26400 bps n=33 Minimum link rate: 49333 bps
n=14 28800 bps n=34 Minimum link rate: 50666 bps
n=15 31200 bps n=35 Minimum link rate: 52000 bps
n=16 33600 bps n=36 Minimum link rate: 53333 bps
n=17 28000 bps n=37 Minimum link rate: 54666 bps
n=18 29333 bps n=38 Minimum link rate: 56000 bps
n=19 30666 bps n=39 Minimum link rate: 57333 bps
n=20 32000 bps &Wn n=0 Store Configuration 0
n=21 33333 bps n=1 Store Configuration 1
n=22 34666 bps &Yn n=0 Destructive
n=23 36000 bps n=1 Destructive/Expedited
n=24 37333 bps n=2 Nondest./Expedited
n=25 38666 bps n=3 Nondest./Unexpedited
n=26 40000 bps &Zn=s Store Phone Number
n=27 41333 bps &Zn? Query Phone Number
n=28 42666 bps
n=29 44000 bps
n=30 45333 bps
n=31 46666 bps
n=32 48000 bps
n=33 49333 bps
n=34 50666 bps
n=35 52000 bps
n=36 53333 bps
n=37 54666 bps
n=38 56000 bps
n=39 57333 bps
S Register Functions
--------------------
S0 Ring to Answer On S24 Reserved
S1 Counts # of Rings S25 DTR Recognition Time (1/100sec)
S2 Escape Code Char S26 Reserved
S3 Carriage Return Char S27 Bit Mapped
S4 Line Feed Char 1 = V21 Mode
S5 Backspace Char 2 = Disable TCM
S6 Wait Time/Dial Tone (sec) 4 = Disable V32
S7 Wait Time/Carrier (sec) 8 = Disable 2100hz
S8 Comma Time (sec) 16 = Enable V23 Fallback
S9 Carrier Detect Time (1/10sec) 32 = Disable V32bis
S10 Carrier Loss Time (1/10sec) 64 = Reserved
S11 Dial Tone Spacing (msec) 128 = Software Compatibility Mode
S12 Escape Code Time (1/50sec) S28 V32 Handshake Time (1/10sec)
S13 Bit Mapped S29 V.21 Answer Mode fallback timer
1 = Reset On DTR Loss S30 Reserved
2 = Reduced Non ARQ TX Buffer S31 Reserved
4 = Set DEL=Backspace S32 Connection bit mapped operations.
8 = Do DS0 On DTR 1 = V.8 Call Indicate Enable
16 = Do DS0 On Reset 2 = Enable V.8 Mode
32 = Reserved 4 = Disable V.FC modulation
64 = Reserved 8 = Disable V.34 modulation
128 = Escape Code Hang Up 16 = Disable V.34+ modulation
S14 Reserved 32 = Disable x2 modulation
S15 Bit Mapped 64 = Disable V.90 modulation
1 = MNP/V.42 Disabled in V.22 128 = Reserved
2 = MNP/V.42 Disabled in V.22bis S33 V.34 & V.34+ Connection setup
4 = MNP/V.42 Disabled in V.32 bit mapped control flags.
32 = Disable MNP Level 3 4 = Disable 2800 Symbol rate
64 = Unusual MNP-Incompatibility 8 = Disable 3000 Symbol rate
128 = Disable V.42 16 = Disable 3200 Symbol rate
136 = Disable V.42 detection phase 32 = Disable 3429 Symbol rate
S16 Test Modes 64 = Reserved
1 = Reserved 128 = Disable Shaping
2 = Dial Test S34 V.34 & V.34+ Connection setup
4 = Reserved bit mapped control flags.
8 = Reserved 1 = Reserved
16 = Reserved 2 = Reserved
32 = Reserved 4 = Reserved
64 = Reserved 8 = Reserved
128 = Reserved 16 = Disable Non linear coding
S17 Reserved 32 = Disable TX level deviation
S18 &Tn Test Timeout (sec) 64 = Disable Pre-emphasis
S19 Inactivity Timeout (min) 128 = Disable Pre-coding
S20 Reserved S35 Reserved
S21 Break Length (1/100sec) S36 Reserved
S22 Xon Char S37 Reserved
S23 Xoff Char S38 Disconnect Wait Time (sec)
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.