The following may assist you in determining your available command sets for your modem. The entries are designated around the chipset manual and may not be implemented oin all modems. Check the column for your modem type or chipset to see if the available command is available to you.
| COMMAND | DESCRIPTION | MODEM OR CHIPSET | |
|---|---|---|---|
| AT BASIC COMMANDS | RCV336ACF/SVD | US ROBOTICS | |
| +++ | Escapt to command mode | * | * |
| AT | Attention | * | * |
| A/ | Re-execute command. | * | |
| A | Go off-hook and attempt to answer a call. | * | * |
| B0 | Select V.22 connection at 1200 bps. | * | * |
| B1 | Select Bell 212A connection at 1200 bps. | * | * |
| C1 | Return OK message. | * | |
| Dn | Dial modifier. | * | * |
| E0 | Turn off command echo. | * | * |
| E1 | Turn on command echo. | * | * |
| F0 | Locol Echo On | * | |
| F1 | Local echo Off | * | |
| H0 | Initiate a hang-up sequence. | * | * |
| H1 | If on-hook, go off-hook and enter command mode. | * | * |
| I0 | Report product code. | * | * |
| I1 | Compute and report checksum. | * | * |
| I2 | Compute checksum and report result of comparison to pressured checksum. | * | * |
| I3 | Report firmware revision, model, and interface type. | * | * |
| I4 | Report response programmed by an OEM. | * | * |
| I5 | Report the country code parameter. | * | * |
| I6 | Report modem data pump model and code revision. | * | * |
| I7 | Reports the DAA code (world-class models only). | * | * |
| L0 | Set low speaker volume. | * | * |
| L1 | Set low speaker volume. | * | * |
| L2 | Set medium speaker volume. | * | * |
| L3 | Set high speaker volume. | * | * |
| M0 | Turn speaker off. | * | * |
| M1 | Turn speaker on during handshaking and turn speaker off while receiving carrier. | * | * |
| M2 | Turn speaker on during handshaking and while receiving carrier. | * | * |
| M3 | Turn speaker off during dialing and receiving carrier and turn speaker on during answering. | * | * |
| N0 | Turn off automode detection. | * | |
| N1 | Turn on automode detection. | * | |
| O0 | Go on-line. | * | * |
| O1 | Go on-line and initiate a retrain sequence. | * | * |
| P | Force pulse dialing. | * | * |
| Q0 | Allow result codes to DTE. | * | * |
| Q1 | Inhibit result codes to DTE. | * | * |
| Q2 | Display result codes only in Originate mode | * | |
| Sn | Select S-Register as default. | * | * |
| Sn,b=n | Set Bit in retister n to 0/1 | * | |
| Sn? | Return the value of S-Register n. | * | * |
| S$ | Display S registers | * | |
| Sn=v | Set default S-Register to value v. | * | * |
| Sn? | Return the value of default S-Register. | * | * |
| T | Force DTMF dialing. | * | * |
| V0 | Report short form (terse) result codes. | * | * |
| V1 | Report long form (verbose) result codes. | * | * |
| W0 | Report DTE speed in EC mode. | * | |
| W1 | Report line speed, EC protocol and DTE speed. | * | |
| W2 | Report DCE speed in EC mode. | * | |
| X0 | Report basic call progress result codes, i.e., OK, CONNECT, RING, NO CARRIER (also, for busy, if | * | * |
| enabled, and dial tone not detected), NO ANSWER and ERROR. | * | ||
| X1 | Report basic call progress result codes and connections speeds (OK, CONNECT, RING, NO | * | |
| CARRIER (also, for busy, if enabled, and dial tone not detected), NO ANSWER, CONNECT XXXX, | * | ||
| and ERROR. | * | ||
| X2 | Report basic call progress result codes and connections speeds, i.e., OK, CONNECT, RING, NO | * | |
| CARRIER (also, for busy, if enabled, and dial tone not detected), NO ANSWER, CONNECT XXXX, | * | ||
| and ERROR. | * | ||
| X3 | Report basic call progress result codes and connection rate, i.e., OK, CONNECT, RING, NO | * | |
| CARRIER, NO ANSWER, CONNECT XXXX, BUSY, and ERROR. | * | ||
| X4 | Report all call progress result codes and connection rate, i.e., OK, CONNECT, RING, NO CARRIER, | * | |
| NO ANSWER, CONNECT XXXX, BUSY, NO DIAL TONE and ERROR. | * | ||
| Y0 | Disable long space disconnect before on-hook. | * | * |
| Y1 | Enable long space disconnect before on-hook. | * | * |
| Z0 | Restore stored profile 0 after warm reset. | * | * |
| Z1 | Restore stored profile 1 after warm reset. | * | * |
| Z2 | Reset to NVRAM profile 1 | * | |
| Z3 | Reset modem to factory profile 0 (&F0) | * | |
| Z4 | Reset modem to factory default profile 1 (&F1) | * | |
| Z5 | Reset modem to factory default profile 2 (&F2) | * | |
| &A0 | ARQ Result disabled | * | |
| &A1 | ARQ Result enabled | * | |
| &A2 | V.321 modulation indicator added | * | |
| &A3 | Protocol indicators added | * | |
| &B0 | * | ||
| &B1 | * | ||
| &B2 | * | ||
| &C0 | Force RLSD active regardless of the carrier state. | * | * |
| &C1 | Allow RLSD to follow the carrier state. | * | * |
| &D0 | Interpret DTR ON-to-OFF transition per &Qn: | * | * |
| &Q0, &05, &06 The modem ignores DTR. | * | * | |
| &Ql, &04 The modem hangs up | * | * | |
| &Q2, &03 The modem hangs up | * | * | |
| &D1 | Interpret DTR ON-to-OFF transition per &Qn: | * | * |
| &QO, &01, &Q4, &Q5, &06 Asynchronous escape | * | * | |
| &Q2, &03 The modem hangs up | * | * | |
| &D2 | Interpret DTR ON-to-OFF transition per &Qn: | * | * |
| &Q0 thru &Q6 The modem hangs up | * | * | |
| &D3 | Interpret DTR ON-to-OFF transition per &Qn:. | * | * |
| &QO, &01, &04, &Q5, &Q6 The modem performs soft reset | * | * | |
| &Q2, &Q3 The modem hangs up | * | * | |
| &F0 | Restore factory configuration 0. | * | |
| &F1 | Restore factory configuration 1. | * | * |
| &G0 | Disable guard tone. | * | * |
| &G1 | Disable guard tone. | * | * |
| &G2 | Enable 1800 Hz guard tone. | * | * |
| &H0 | TD Flow control disabled | * | |
| &H1 | Hardware flow control | * | |
| &H2 | Software flow control | * | |
| &H3 | HW & SW flow control | * | |
| &I0 | SW flow control disabled | * | |
| &I1 | XON/XOFF to modem and remote | * | |
| &I2 | XON/XOFF to your modem only | * | |
| &J0 | Set S-Register response only for compatibility. | * | |
| &J1 | Set S-Register response only for compatibility. | * | |
| &K0 | Modem dependent | * Disable DTE/DCE flow control. |
* Disable Data compression |
| &K1 | Modem dependent | * Auto enable/disable |
|
| &K2 | Modem dependent | * Data compression enabled |
|
| &K3 | Modem dependent | * Enable RTS/CTS DTE/DCE flow control. |
*MNP5 compression disabled |
| &K4 | Modem dependent | * Enable XON/XOFF DTE/DCE flow control. |
|
| &K5 | Modem dependent | * Enable transparent XON/XOFF flow control. |
|
| &K6 | Modem dependent | * Enable both RTS/CTS and XON/XOFF flow control. |
|
| &L0 | Select dial up line operation. | * | |
| &M0 | Modem dependent | * Select direct asynchronous mode. |
* Normal Mode; Error control disabled |
| &M1 | Modem dependent | Reserved | |
| &M2 | Modem dependent | Reserved | |
| &M3 | Modem dependent | Reserved | |
| &M4 | Modem dependent | Normal/ARQ | |
| &M5 | Modem dependent | ARQ Mode | |
| &N0 | Set connect speed to variable rate | * | |
| &N1 | Set connect speed to 300 bps | * | |
| &N2 | Set connect speed to 1200 bps | * | |
| &N3 | Set connect speed to 2400 bps | * | |
| &N4 | Set connect speed to 4800 bps | * | |
| &N5 | Set connect speed to 7200 bps | * | |
| &N6 | Set connect speed to 9600 bps | * | |
| &N7 | Set connect speed to 12000 bps | * | |
| &N8 | Set connect speed to 14000 bps | * | |
| &N9 | Set connect speed to 16800 bps | * | |
| &N0 | Set connect speed to 19200 bps | * | |
| &N10 | Set connect speed to 21600 bps | * | |
| &N11 | Set connect speed to 24000 bps | * | |
| &N12 | Set connect speed to 26400 bps | * | |
| &N13 | Set connect speed to 28800 bps | * | |
| &N14 | Set connect speed to 31200 bps V.34+ | * | |
| &N15 | Set connect speed to 33600 bps V.34+ | * | |
| &N16 | Set connect speed to 28800 bps X2 | * | |
| &N17 | Set connect speed to 31200 bps X2 | * | |
| &N18 | Set connect speed to 31200 bps X2 | * | |
| &N19 | Set connect speed to 33600 bps X2 | * | |
| &N20 | Set connect speed to 33333 bps X2 | * | |
| &N21 | Set connect speed to 37333 bps X2 | * | |
| &N22 | Set connect speed to 41333 bps X2 | * | |
| &N23 | Set connect speed to 42666 bps X2 | * | |
| &N24 | Set connect speed to 44000 bps X2 | * | |
| &N25 | Set connect speed to 45333 bps X2 | * | |
| &N26 | Set connect speed to 46666 bps X2 | * | |
| &N27 | Set connect speed to 48000 bps X2 | * | |
| &N28 | Set connect speed to 49333 bps X2 | * | |
| &N29 | Set connect speed to 50666 bps X2 | * | |
| &N30 | Set connect speed to 52000 bps X2 | * | |
| &N31 | Set connect speed to 53333 bps X2 | * | |
| &N32 | Set connect speed to 54666 bps X2 | * | |
| &P0 | Set 10 pps pulse dial with 39%/61% make/break. | * | * |
| &P1 | Set 10 pps pulse dial with 33%/67% make/break. | * | * |
| &P2 | Set 20 pps pulse dial with 39%/61% make/break. | * | |
| &P3 | Set 20 pps pulse dial with 33%/67% make/break. | * | |
| &Q0 | Select direct asynchronous mode. | * | |
| &Q4 | Select Hayes AutoSync mode. | * | |
| &Q5 | Modem negotiates an error corrected link. | * | |
| &Q6 | Select asynchronous operation in normal mode. | * | |
| &R0 | CTS tracks RTS (async) or acts per V.25 (sync). | * | Reserved |
| &R1 | CTS is always active. | * | * |
| &S0 | DSR is always active. | * | * |
| &S1 | DSR acts per V.25. | * | * |
| &T0 | Terminate any test in progress. | * | * |
| &T1 | Initiate local analog loopback. | * | * |
| &T2 | Returns ERROR result code. | * | * |
| &T3 | Initiate local digital loopback. | * | * |
| &T4 | Allow remote digital loopback. | * | * |
| &T5 | Disallow remote digital loopback request. | * | * |
| &T6 | Request an RDL without self-test. | * | * |
| &T7 | Request an RDL with self-test. | * | * |
| &T8 | Initiate local analog loop with self-test. | * | * |
| &U0 | Set floor speed to variable rate | * | |
| &U1 | Set floor speed to 300 bps | * | |
| &U2 | Set floor speed to 1200 bps | * | |
| &U3 | Set floor speed to 2400 bps | * | |
| &U4 | Set floor speed to 4800 bps | * | |
| &U5 | Set floor speed to 7200 bps | * | |
| &U6 | Set floor speed to 9600 bps | * | |
| &U7 | Set floor speed to 12000 bps | * | |
| &U8 | Set floor speed to 14000 bps | * | |
| &U9 | Set floor speed to 16800 bps | * | |
| &U0 | Set floor speed to 19200 bps | * | |
| &U10 | Set floor speed to 21600 bps | * | |
| &U11 | Set floor speed to 24000 bps | * | |
| &U12 | Set floor speed to 26400 bps | * | |
| &U13 | Set floor speed to 28800 bps | * | |
| &U14 | Set floor speed to 31200 bps V.34+ | * | |
| &U15 | Set floor speed to 33600 bps V.34+ | * | |
| &U16 | Set floor speed to 28800 bps X2 | * | |
| &U17 | Set floor speed to 31200 bps X2 | * | |
| &U18 | Set floor speed to 31200 bps X2 | * | |
| &U19 | Set floor speed to 33600 bps X2 | * | |
| &U20 | Set floor speed to 33333 bps X2 | * | |
| &U21 | Set floor speed to 37333 bps X2 | * | |
| &U22 | Set floor speed to 41333 bps X2 | * | |
| &U23 | Set floor speed to 42666 bps X2 | * | |
| &U24 | Set floor speed to 44000 bps X2 | * | |
| &U25 | Set floor speed to 45333 bps X2 | * | |
| &U26 | Set floor speed to 46666 bps X2 | * | |
| &U27 | Set floor speed to 48000 bps X2 | * | |
| &U28 | Set floor speed to 49333 bps X2 | * | |
| &U29 | Set floor speed to 50666 bps X2 | * | |
| &U30 | Set floor speed to 52000 bps X2 | * | |
| &U31 | Set floor speed to 53333 bps X2 | * | |
| &U32 | Set floor speed to 54666 bps X2 | * | |
| &V | Display current configurations. | * | |
| &W0 | Store the active profile in NVRAM profile 0. | * | * |
| &W1 | Store the active profile in NVRAM profile 1 - | * | * |
| &Y0 | Modem dependent | * Recall stored profile 0 upon power up. |
* Destructive break handling |
| &Y1 | Modem dependent | * Recall stored profile 1 upon power up. |
* Destructive breaking handling, expedited |
| &Y2 | Modem dependent | Nondestructive, expedited | |
| &Zn=x | Store dial string x (to 34) to location n (0 to 3). | * | * |
| &Zn=L | Store last number to location n | * | |
| &Zn? | Display number in n | * | |
| &ZL? | Display last number dialed | * | |
| %E0 | Disable line quality monitor and auto retrain. | * | |
| %E1 | Enable line quality monitor and auto retrain. | * | |
| %E2 | Enable line quality monitor and failback/fall forward. | * | |
| %L | Return received line signal level. | * | |
| %Q | Report the line signal quality. | * | |
| %TTn | PTT certification test signals. | * | |
| \Kn | Controls break handling during three states: | * | |
| When modem receives a break from the DTE: | |||
| \K0,2,4 | Enter on-line command mode, no break sent to the remote modem. | * | |
| \K1 | Clear buffers and send break to remote modem. | * | |
| \K3 | Send break to remote modem immediately. | * | |
| \K5 | Send break to remote modem in sequence with transmitted data. | * | |
| When modem receives \B in on-line command state: | |||
| \K0,1 | Clear buffers and send break to remote modem. | * | |
| \K2,3 | Send break to remote modem immediately. | * | |
| \K4,5 | Send break to remote modem in sequence with transmitted data. | * | |
| When modem receives break from the remote modem: | |||
| \K0,1 | Clear data buffers and send break to DTE. | * | |
| \K2,3 | Send a break immediately to DTE. | * | |
| \K4,5 | Send a break with received data to the DTE. | * | |
| \N0 | Select normal speed buffered mode. | * | |
| \N2 | Select reliable link mode. | * | |
| \N3 | Select auto reliable mode. | * | |
| \N4 | Force LAPM mode. | * | |
| \N5 | Force MNP mode. | * | |
| \V0 | Disable single line connect message. | * | |
| \V1 | Enable single line connect message. | * | |
| +MS | Select modulation | * | |
| **0 | Download to flash memory at last sensed speed. | * | |
| **1 | Download to flash memory at 38.4 kbps. | * | |
| **2 | Download to flash memory at 57.6 kbps. | * | |
| -SDR=0 | Disable Distinctive Ring. | * | |
| -SDR=1 | Enable Distinctive Ring Type 1. | * | |
| -SDR=2 | Enable Distinctive Ring Type 2. | * | |
| -SDR=3 | Enable Distinctive Ring Type 1 and 2. | * | |
| -SDR=4 | Enable Distinctive Ring Type 3. | * | |
| -SDR=5 | Enable Distinctive Ring Type I and 3. | * | |
| -SDR=6 | Enable Distinctive Ring Type 2 and 3. | * | |
| -SDR=7 | Enable Distinctive Ring Type 1, 2, and 3. | * | |
| ECC COMMANDS | |||
| %C0 | Disable data compression. | * | |
| %C1 | Enable MNP 5 data compression. | * | |
| %C2 | Enable V.42 bis data compression. | * | |
| %C3 | Enable both V.42 Uis and MNP 5 compression. | * | |
| \A0 | Set maximum block size in MNP to 64. | * | |
| \A1 | Set maximum block size in MNP to 128. | * | |
| \A2 | Set maximum block size in MNP to 192. | * | |
| \A3 | Set maximum block size in MNP to 256. | * | |
| \Bn | Send break of n x 1 00 ms. | * | |
| MNP 10 COMMANDS | |||
| -K0 | Disable MNP 1 0 extended services. | * | |
| -K1 | Enable MNP 1 0 extended services. | * | |
| -K2 | Enable MNP 1 0 extended services detection only. | * | |
| -SEC=0 | Disable MNP 10EC. | * | |
| -SEC=1,[<tx level>] | Enable MN P 1 OEC and set transmit level <tx level> 0 to 30 (O dBm to -30 dBm). | * | |
| W-CLASS COMMANDS | |||
| *B | Display list of permanently blacklisted numbers. | * | |
| *D | Display list of delayed numbers. | * | |
| *NCnn | Change country to one of eight in NVRAM. | * | |
| CALLER-ID COMMANDS | |||
| #CID=0 | Disable Caller ID. | * | |
| #CID=1 | Enable Caller ID with formatted presentation. | * | |
| #CID=2 | Enable Caller ID with unformatted presentation. | * | |
| FAX CLASS-1 COMMANDS | |||
| +FCLASS=n | Service class. | * | |
| +FAE=n | Data/fax auto answer | * | |
| +FRH=n | Receive data with HDLC framing. | * | |
| +FRM=n | Receive data. | * | |
| +FRS=n | Receive silence. | * | |
| +FTH=n | Transmit data with HDLC framing. | * | |
| +FTM=n | Transmit data. | * | |
| +FTS=n | Stop transmission and wait. | * | |
| VOICE COMMANDS | |||
| #BDR | Select baud rate (turn off autobaud). | * | |
| #CLS | Select data, fax, or voice. | * | |
| #MDL? | Identify model. | * | |
| #MFR? | Identify manufacturer. | * | |
| #REV? | Identify revision level. | * | |
| #TL | Audio output transmit level. | * | |
| #VBQ? | Query buffer size. | * | |
| #VBS | Bits per sample. | * | |
| #VBT | Beep tone timer. | * | |
| #VCI? | Identify compression method. | * | |
| #VGT | Set playback volume in the command state. | * | |
| #VLS | Voice line select. | * | |
| #VRA | Ringback goes away timer (originate). | * | |
| #VRN | Ringback never came timer (originate). | * | |
| #VRX | Voice receive mode. | * | |
| #VSD | Enable silence deletion (no function; command response only). | * | |
| #VSK | Buffer skid setting. | * | |
| #VSP | Silence detection period (voice receive). | * | |
| #VSR | Sampling rate selection. | * | |
| #VSS | Silence detection tuner (voice receive). | * | |
| #VTD | DTMF/tone reporting. | * | |
| #VTM | Enable timing mark placement. | * | |
| #VTS | Generate tone signals. | * | |
| #VTX | Voice transmit mode. | * | |
| VOICEVIEW COMMANDS | |||
| +FCLASS=N | Service class | * | |
| -SVV | Originate VoiceView data mode | * | |
| -SAC | Accept data mode request | * | |
| --SIP | Initialize VoiceView parameters | * | |
| -SIC | Reset capabilities data to default setting | * | |
| -SSQ | Initiate capabilities query | * | |
| -SDA | Originate modem data mode | * | |
| -SFX | Originate FAX data mode | * | |
| -SMT | Mute telephone | * | |
| -SDS | Disable switchhook status monitoring | * | |
| -SQR | Capabilities query response control | * | |
| -SCD | Capabilities data | * | |
| -SER? | Error status (read only) | * | |
| -DTP | VoiceView transmission speed | * | |
| -SSR | Start sequence response control | * | |
| +FLO | Flow control select | * | |
| +FPR | Serial port rate control | * | |
| -SSV | VoiceView data mode start sequence event | * | |
| -SFA | Facsimile data node start sequence event | * | |
| -SMD | Modem data mode start sequence event | * | |
| -SRA | Receive ADSI response event | * | |
| -SRQ | Receive capabilities query event | * | |
| -SRC: | Receive capabilities information event | * | |
| -STO | Talk-off event | * | |
| -SMX=x | Enable/disable MLI 44 data burst | * | |
| -SMS=x,y,z,t | Select AudioSpan/DSVD mode | * | |
| -SQX=x,y | Select AudioSpan modulation | * | |
| -SMS=x,y,z,t | Select AudioSpan/DSVD mode | * | |
| -SSE=x | Enable/Disable DSVD | * | |