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When entering an AT-commandstring do not mix UPPER-CASE and lower-case letters.
(Sample: use AT&F -or- at&f and not aT&f )
Modem Commands - Functions
| Command | CMD-n | Modem Function/Option |
|---|---|---|
| A | Manual Answer mode (when modem has not received an incoming call) modem forced to Off Hook |
|
| A/ | Re-execute last command once (Re-dial) | |
| A> | Repeat last command (10x) continuously | |
| Any key | Terminate current connection attempt, and exit Repeat mode - go Off Hook |
|
| AT | Attention: must precede all other commands, except A/, A>, and +++ |
|
| Bn | U.S./(CCITT) ITU-T Handshake options | |
| B0 | ITU-T-V.25 (CCITT) answer sequence | |
| B1 | Reserved | |
| Cn | Transmitter On/Off | |
| C0 | Transmitter Off | |
| C1 | Transmitter On-Default | |
| Dn | Dial number n and go into originate mode | |
| P | Pulse dial - Default | |
| T | Touch-Tone dial (DTMF-tone) | |
| , (Comma) | Pause for 2 seconds | |
| ; | Return to AT-cmd state after dialing | |
| "... | Dial the letters that follow | |
| ! | Flash switch-hook to transfer call | |
| / (slash) | Delayed (125ms) dial operation | |
| W | Wait for 2nd dial tone (if X3 or higher is set) | |
| @ | Wait for an answer (if X3 or higher is set) | |
| R | Connect - use (Reverse) frequencies | |
| S | Dial stored number | |
| DL | Dial the last-dialed number | |
| D$ | Online Help - show dial commands | |
| DSn | Dial number stored in NVRAM at position n (0-3) | |
| En | Command mode local echo, not applicable after a connection has been made |
|
| E0 | Echo Off | |
| E1 | Echo On - Default | |
| Fn | Local echo On/Off when a connection has been made | |
| F0 | Echo On (Half duplex) | |
| F1 | Echo Off (Full duplex) - Default | |
| Hn | On/Off hook control | |
| H0 | Hang up (go on hook) - Default | |
| H1 | Go off hook | |
| In | Inquiry | |
| I0 | Return modem product code/version | |
| I1 | Return memory (ROM) checksum | |
| I2 | Run memory (RAM) test | |
| I3 | Returns product-type or call duration/real time | |
| I4 | Return current active modem settings | |
| I5 | Return NVRAM settings | |
| I6 | Return link diagnostics | |
| I7 | Return product (Flash) configuration | |
| I9 | Return Plug-and-Play (PnP) information | |
| I11 | Return connection statistic | |
| Kn | Modem clock operation | |
| K0 | ATI3 displays call duration - Default | |
| K1 | ATI3 displays real time, set with ATI3=HH:MM: | |
| Ln | Loudness of speaker volume | |
| L0 | Low | |
| L1 | Low | |
| L2 | Medium | |
| L3 | High | |
| Mn | Monitor (speaker) control | |
| M0 | Speaker always set to Off | |
| M1 | Speaker On until carrier is established - Default | |
| M2 | Speaker always On | |
| M3 | Speaker On after last digit dialed out, Off at start (connect) carrier detected |
|
| On | Return on-line after command execution | |
| O0 | Return on-line, normal | |
| O1 | Return on-line, start retrain | |
| P | Pulse dial | |
| Qn | Result codes display | |
| Q0 | Result codes displayed | |
| Q1 | Result codes suppressed (quiet mode) | |
| Q2 | Result codes during dial out only | |
| Q3 | Result codes only in answering mode | |
| Sr=n | Set Register commands: r is any S-register, n must be a decimal number between 0 and 255. |
|
| Sr.b=n | Set bit.b of register r to n (0=OFF or 1=On) | |
| Sn? | Query register n | |
| T | Tone dial | |
| Vn | Verbal/Numeric result codes | |
| V0 | show numeric result codes | |
| V1 | show verbal (text) result codes | |
| Xn | Result code options - Default = X4 | |
| Yn | Load working RAM at PWR-On/reset with configuration (data) from |
|
| Y0 | Load NVRAM-profile 0 - Factory default 0 | |
| Y1 | Load NVRAM-profile 0 - Factory default 1 | |
| Y2 | Load user profile - &F0 | |
| Y3 | Hardware profile - Factory &F1 | |
| Y4 | Software profile - Factory &F2 | |
| Zn | Modem - reset control | |
| Z0 | Reset Modem - use Y-command NVRAM profile | |
| Z1 | Reset Modem - use NVRAM Profile-0 | |
| Z2 | Reset Modem - use NVRAM Profile-1 | |
| Z3 | Reset Modem - use Factory Profile-0 | |
| Z4 | Reset Modem - use Factory Profile-1 | |
| Z5 | Reset Modem - use Factory Profile-2 | |
| +++ | Escape code sequence, preceded and followed by at least one second of no data transmission. |
|
| > | Repeat command continuosly or up to 10 dial attempts Canceled by pressing any key |
|
| $ | Online Help - Basic command summary | |
| &$ | Online Help - & command summary | |
| %$ | Online Help - % command summary | |
| D$ | Online Help - Dial command summary | |
| S$ | Online Help - S-Register summary | |
| <Ctrl>S | Stop/restart display of HELP screens | |
| <Ctrl>C | Cancel display of HELP screens | |
| <Ctrl>K | Cancel display of HELP screens | |
| &An | ARQ result codes 14-17, 19 | |
| &A0 | Supress ARQ result codes | |
| &A1 | Display ARQ result codes | |
| &A2 | Display HST and V.32 result codes | |
| &A3 | Display protocol result codes LAMP/MNP/NONE - Default |
|
| &Bn | Data Rate, terminal-to-modem (DTE/DCE) | |
| &B0 | DTE rate follows connection rate - Default | |
| &B1 | Fixed DTE rate - Default | |
| &B2 | Fixed DTE rate in ARQ mode, variable DTE rate in non-ARQ mode. |
|
| &Cn | Carrier Detect (CD) operations | |
| &C0 | CD override | |
| &C1 | Normal CD operations - Default | |
| &Dn | Data Terminal Ready (DTR) operations | |
| &D0 | DTR override | |
| &D1 | Reserved | |
| &D2 | Normal DTR Operation - Default | |
| &Fn | Load Factory default settings into working RAM | |
| &F0 | Load user (saved) settings into working RAM | |
| &F1 | Load hardware-control profile | |
| &F2 | Load software-control profile | |
| &Gn | Guard tone | |
| &G0 | No guard tone, U.S. and Canada - Default | |
| &G1 | 550Hz-Guard tone, some European countries | |
| &G2 | 1800Hz-Guard tone, U.K. requires B0-setting | |
| &Hn | Transmit Data flow control | |
| &H0 | Flow control disabled - Default | |
| &H1 | Hardware (CTS) flow control | |
| &H2 | Software (XON/XOFF) flow control - Printer | |
| &H3 | Hardware and software control | |
| &In | Received Data software flow control | |
| &I0 | Flow control disabled - Default | |
| &I1 | XON/XOFF to local modem and remote computer | |
| &I2 | XON/XOFF to local modem only | |
| &I3 | Host mode, Hewlett Packard protocol | |
| &I4 | Terminal mode, Hewlett Packard protocol | |
| &I5 | ARQ mode same as &I2, non-ARQ mode, look for incoming XON/XOFF |
|
| &Jn | Telephone jack selection | |
| &J0 | RJ-11, RJ-41S, RJ-45S | |
| &J1 | RJ-1, RJ-12, RJ-13 | |
| &Kn | Data Compression | |
| &K0 | Disabled | |
| &K1 | Auto enable/disable - Default | |
| &K2 | Compression enabled | |
| &K3 | MNP5 - compression disabled | |
| &Ln | Switched/Leased line operation | |
| &L0 | Normal phone line (switched) - Default | |
| &L1 | Leased line | |
| &Mn | Error Control/Synchronous Options => 1200 Bps | |
| &M0 | Normal mode, no error (ARQ) control | |
| &M1 | Synchronous mode | |
| &M2 | Synchronous mode 2 stored number dialing | |
| &M3 | Synchronous mode 2 manual dialing | |
| &M4 | Normal/ARQ - Default | |
| &M5 | ARQ mode hang-up if ARQ connection cannot be made | |
| &Nn | Data Rate, data link (DCE/DCE) | |
| &N0 | Variabl Rate operations - Default | |
| &N1 | 300 bps | |
| &N2 | 1200 bps | |
| &N3 | 2400 bps | |
| &N4 | 4800 bps | |
| &N5 | 7200 bps | |
| &N6 | 9600 bps | |
| &N7 | 12.000 bps | |
| &N8 | 14.400 bps | |
| &N9 | 16.800 bps | |
| &N10 | 19.200 bps | |
| &N11 | 21.600 bps | |
| &N12 | 24.000 bps | |
| &N13 | 26.400 bps | |
| &N14 | 28.800 bps | |
| &N15 | 31.200 bps | |
| &N16 | 33.600 bps | |
| &Pn | Pulse dial make/break ratio | |
| &P0 | North America 39%-61% - Default | |
| &P1 | British Commonwealth 33%-67% | |
| &Rn | Received Data hardware (RTS) flow control | |
| &R0 | CTS follow RTS | |
| &R1 | Ignore RTS | |
| &R2 | Pass received data on RTS high, used Pass received data on RTS high - Default |
|
| &Sn | Data Set Ready (DSR) override | |
| &S0 | DSR override (always on) - Default | |
| &S1 | Modem controls DSR | |
| &Tn | Modem Testing | |
| &T0 | End Testing | |
| &T1 | Analog loopback (AL-Test) | |
| &T2 | Reserved | |
| &T3 | Digital loopback (DL-Test) | |
| &T4 | Grant remote digital loopback (RDL-Test) | |
| &T5 | Deny remote digital loopback | |
| &T6 | Start remote digital loopback | |
| &T7 | Start digital loopback with self-test | |
| &T8 | Start analog loopback with self-test | |
| &Wn | Save current working RAM settings | |
| &W0 | Save RAM settings to NVRAM profile 0 (Y0) | |
| &W1 | Save RAM settings to NVRAM profile 1 (Y1) | |
| &Xn | Synchronous timing source | |
| &X0 | Use modem X-mit clock | |
| &X1 | Use terminal X-mit clock | |
| &X2 | Use modem receiver clock | |
| &Yn | Break handling. Destructive breaks clear the buffer, expedited breaks are sent immediately to remote system. |
|
| &Y0 | Destructive, don't send break | |
| &Y1 | Destructive expedited - Default | |
| &Y2 | Non-destructive, expedited | |
| &Y3 | Reserved | |
| &Zn=L | Store last-dialed phone number in NVRAM at pos n | |
| &Zn=s | Write phone number(s) to NVRAM at pos n (0-3), 36 characters maximum |
|
| &Zn? | Display phone number in NVRAM at pos. n (n=0-3) | |
| %Rn | Remote access to Rack Controller Unit (RCU) | |
| %R0 | Disabled | |
| %R1 | Enabled | |
| %T | Enable Touch Tone recognition |
S-Register Settings - Functions
| S-Register | Value | Modem Function/Option |
|---|---|---|
| S1 | Count and stores numer of incoming rings | |
| S2 | Define escape code character - Default = + (43) | |
| S3 | Define ASCII (CR) carrige return (13) | |
| S4 | Define ASCII (LF) line feed (10) | |
| S5 | Define ASCII (BS) Backspace (8) | |
| S6 | Number of seconds wait before dial (2) | |
| S7 | Number of seconds wait for carrier (30) | |
| S8 | Duration (sec) for pause (,) option in Dial command and pause between command re-executions for Repeat (>) command. |
|
| S9 | Duration (.1sec units) of remote carrier signal before recognition. (6) |
|
| S10 | Duration (.1sec units) modem waits after loss of carrier signal before go on hook. (7) |
|
| S11 | Duration and spacing (ms) of dialed Touch-Tones (DTMD-tone) (70) |
|
| S12 | Guard time (in .02 sec units) for escape code sequence (+++) (50) |
|
| S13 | Bit-mapped register (0) | |
| 1 | Reset when DTR drops | |
| 2 | Auto answer in originate mode | |
| 4 | Disable result code pause | |
| 8 | DS0 on DTR low-to-high | |
| 16 | DS0 on power up, ATZ | |
| 32 | Disable HST modulation | |
| 64 | Disable MNP level 3 | |
| 128 | Watchdog hardware reset | |
| S15 | Bit-mapped register (0) | |
| 1 | Disable high-frequency equalization | |
| 2 | Disable on-line fallback | |
| 4 | Force 300-bps back channel | |
| 8 | Set non-ARQ x-mit buffer to 128 bytes | |
| 16 | Disable MNP level 4 | |
| 32 | Set DEL as Backspace key | |
| 64 | Unusual MNP incompatibility | |
| 128 | Custom applications only | |
| S16 | Bit-mapped register (0) | |
| 1 | Analog loopback | |
| 2 | Dial test | |
| 4 | Test pattern | |
| 8 | Initiate remote digital loopback | |
| 16 | Reserved | |
| 32 | Reserved | |
| 64 | Reserved | |
| 128 | Reserved | |
| S18 | &Tn Test timer, disabled when set to 0 (0) | |
| S19 | Set inactivity timer in minutes (0) | |
| S21 | Length of Break, DCE to DTE, in 10ms units | |
| S22 | Define ASCII XON (17) | |
| S23 | Define ASCII XOFF (19) | |
| S24 | Duration (20ms units) of pulsed DSR when modem is set to &S2 or &S3 (150) |
|
| S25 | Delay to DTR in 10ms units (5) | |
| S26 | Duration (10ms units) of delay between RTS and CTS, synchronous mode (1) |
|
| S27 | Bit-mapped register (0) | |
| 1 | Enable V.21 modulation 300 bps | |
| 2 | Enable unencoded V.32 moulation | |
| 4 | Disable V.32 modulation | |
| 8 | Disable 2100 Hz answer tone | |
| 16 | Disable MNP handshake | |
| 32 | Disable V.42 Dtect phase | |
| 64 | Reserved | |
| 128 | Unusual software in compatibility | |
| S28 | Duration (.1sec units) of V.21/23 handshake delay | |
| S32 | Voice-Data switch options (1) | |
| 0 | Disabled | |
| 1 | Go off hook in originate mode | |
| 2 | Go off hook in answer mode | |
| 3 | Redial last dialed number | |
| 4 | Dial number stored at position 0 | |
| 5 | Auto answer toggle On/Off | |
| 6 | Reset modem | |
| 7 | Initiate remote digital loopback | |
| S34 | Bit-mapped register (0) | |
| 1 | Disable V.32bis | |
| 2 | Disable enhanced V.32 mode | |
| 4 | Disable quick V.32 retrain | |
| 8 | Enable V.32 modulation | |
| 16 | Change MR LED to DSR | |
| 32 | Enable MI/MIC | |
| 64 | Reserved | |
| 128 | Reserved | |
| S38 | Duration(sec) before disconnect when DTR drops during an ARQ call (0) |
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.