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 On n=0 Return Online
A/ Repeat Last Command n=1 Return Online & Retrain
A> Continuously Repeat Command P Pulse Dial
AT Command Mode Prefix Qn n=0 Result Codes Sent
A Answer Call n=1 Quiet (No Result Codes)
Bn n=0 V32 Mode/CCITT Answer Seq n=2 Verbose/Quiet On Answer
n=1 Bell Answer Seq Sr=n Sets Register "r" to "n"
Dn Dial a Telephone Number Sr? Query Register "r"
n=0..9#*TPR,;"W@!()- S$ HELP, S Registers
DL Dial Last Phone Number T Tone Dial
DSn Dial Stored Phone Number Vn n=0 Numeric Responses
D$ HELP, Dial Commands n=1 Verbal Responses
En n=0 No Command Echo Xn n=0 Basic Result Codes
n=1 Echo Command Chars n=1 Extended Result Codes
Fn n=0 Online Echo n=2-4 Advanced Result Codes
n=1 No Online Echo Yn n=0 Next reset to &W0 settings
Hn n=0 On Hook (Hang Up) n=1 Next reset to &W1 settings
n=1 Off Hook n=2 Next reset to &F0 settings
In n=0 Product Code n=3 Next reset to &F1 settings
n=1 Checksum n=4 Next reset to &F2 settings
n=2 RAM Test Zn n=0 Software Reset
n=3 Product ID string n=1 Reset to &W0 settings
n=4 Current Settings n=2 Reset to &W1 settings
n=5 NVRAM Settings n=3 Reset to &F0 settings
n=6 Link Diagnostics n=4 Reset to &F1 settings
n=7 Product Configuration n=5 Reset to &F2 settings
n=10 VXD Configuration Screen +++ Escape Code
n=11 V.34 Link Screen $ HELP, Command Summary
Ln n=0 Low Speaker Volume
n=1 Low Speaker Volume
n=2 Med Speaker Volume
n=3 Hi Speaker Volume
Mn n=0 Speaker Off
n=1 Speaker On Until CD
n=2 Speaker Always On
n=3 Speaker Off During Dial
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)
$ Wait for a long-distance bong
! 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 Load Factory Configuration n=7 Remote DLB With Self Test
n=0 Hardare Flow Control Cnfg. n=8 ALB With Self Test
n=1 No Flow Control Cnfg. &Un n=0 Variable link rate floor
n=2 Software Flow Control Cnfg. n=1 Minimum link rate: 300 bps
&Gn n=0 No Guard Tone n=2 Minimum link rate: 1200 bps
n=1 550 Hz Guard Tone n=3 Minimum link rate: 2400 bps
n=2 1800 Hz Guard Tone n=4 Minimum link rate: 4800 bps
&Hn n=0 Disable TX Flow Control n=5 Minimum link rate: 7200 bps
n=1 CTS n=6 Minimum link rate: 9600 bps
n=2 Xon/Xoff n=7 Minimum link rate: 12000 bps
n=3 CTS and Xon/Xoff n=8 Minimum link rate: 14400 bps
&In n=0 Disable RX Flow Control n=9 Minimum link rate: 16800 bps
n=1 Xon/Xoff n=10 Minimum link rate: 19200 bps
n=2 Xon/Xoff Chars Filtered n=11 Minimum link rate: 21600 bps
n=3 HP Enq/Ack Host Mode n=12 Minimum link rate: 24000 bps
n=4 HP Enq/Ack Terminal Mode n=13 Minimum link rate: 26400 bps
n=5 Xon/Xoff for non-ARQ Mode n=14 Minimum link rate: 28800 bps
&Kn n=0 Disable Data Compression n=15 Minimum link rate: 31200 bps
n=1 Auto Data Compression n=16 Minimum link rate: 33600 bps
n=2 Enable Data Compression &Wn n=0 Store Configuration 0
n=3 Selective Data Compression n=1 Store Configuration 1
&Mn n=0 Normal Mode &Yn n=0 Destructive
n=4 ARQ/Normal Mode n=1 Destructive/Expedited
n=5 ARQ Mode n=2 Nondest./Expedited
&Nn n=0 Highest Link Speed n=3 Nondest./Unexpedited
n=1 300 bps &Zn=s Store Phone Number
n=2 1200 bps &Zn? Query Phone Number
n=3 2400 bps
n=4 4800 bps
n=5 7200 bps
n=6 9600 bps
n=7 12000 bps
n=8 14400 bps
n=9 16800 bps
n=10 19200 bps
n=11 21600 bps
n=12 24000 bps
n=13 26400 bps
n=14 28800 bps
n=15 31200 bps
n=16 33600 bps
S Register Functions
--------------------
S0 Ring to Answer On S28 V32 Handshake Time (1/10sec)
S1 Counts # of Rings S29 V.21 Answer Mode fallback timer
S2 Escape Code Char S30 Reserved
S3 Carriage Return Char S31 Reserved
S4 Line Feed Char S32 Connection bit mapped operations.
S5 Backspace Char 1 = V.8 Call Indicate Enable
S6 Wait Time/Dial Tone (sec) 2 = Enable V.8 Mode
S7 Wait Time/Carrier (sec) 4 = Reserved
S8 Comma Time (sec) 8 = Disable V.34 modulation
S9 Carrier Detect Time (1/10sec) 16 = Disable V.34+ modulation
S10 Carrier Loss Time (1/10sec) 32 = Reserved
S11 Dial Tone Spacing (msec) 64 = Reserved
S12 Escape Code Time (1/50sec) 128 = Reserved
S13 Bit Mapped S33 V.34 & V.34+ Connection setup
1 = Reset On DTR Loss bit mapped control flags.
2 = Reduced Non ARQ TX Buffer 1 = Disable 2400 Symbol rate
4 = Set DEL=Backspace 2 = Disable 2743 Symbol rate
8 = Do DS0 On DTR 4 = Disable 2800 Symbol rate
16 = Do DS0 On Reset 8 = Disable 3000 Symbol rate
32 = Reserved 16 = Disable 3200 Symbol rate
64 = Reserved 32 = Disable 3429 Symbol rate
128 = Escape Code Hang Up 64 = Reserved
S14 Reserved 128 = Disable Shaping
S15 Bit Mapped S34 V.34 & V.34+ Connection setup
1 = MNP/V.42 Disabled in V.22 bit mapped control flags.
2 = MNP/V.42 Disabled in V.22bis 1 = Reserved
4 = MNP/V.42 Disabled V.32, V.34 2 = Reserved
8 = Disable MNP Handshake 4 = Reserved
16 = Disable MNP Level 4 8 = Reserved
32 = Disable MNP Level 3 16 = Disable Non linear coding
64 = Unusual MNP-Incompatibility 32 = Disable TX level deviation
128 = Disable V.42 64 = Disable Pre-emphasis
136 = Disable V.42 detection phase 128 = Disable Pre-coding
S16 Test Modes S35 Reserved
1 = Reserved S36 Reserved
2 = Dial Test S37 Reserved
4 = Reserved S38 Disconnect Wait Time (sec)
8 = Reserved S58 Compression dictionary size
16 = Reserved 1 = 1K dictionary
32 = Reserved 2 = 2K dictionary
64 = Reserved 4 = 4K dictionary
128 = Reserved 8 = 8K dictionary
S17 Reserved S59 Low power delay
S18 &Tn Test Timeout (sec) S60 Compression max string length
S19 Inactivity Timeout (min)
S20 Reserved
S21 Break Length (1/100sec)
S22 Xon Char
S23 Xoff Char
S24 Reserved
S25 DTR Recognition Time (1/100sec)
S26 Reserved
S27 Bit Mapped
1 = V21 Mode
2 = Disable TCM
4 = Disable V32
8 = Disable 2100hz
16 = Enable V23 Fallback
32 = Disable V32bis
64 = Reserved
128 = Software Compatibility Mode
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.