Basic Data Commands Extended Data Commands Voice Commands Fax Commands S-Register Definitions
WHAT ARE THOSE COMMANDS USED FOR?
Those commands are used to communicate with the Modem directly when it is working in a Terminal Mode. Although most of the times the Communication Software does that for us, sometimes we have to manually communicate with the Modem in order to verify that everything about the Modem is working properly, or to set some extra commands while connecting to the Internet.
All commands must begin with the AT, or at prefix, except from the A/ and +++ ones.
When a command has numeric options but no number is included, the number zero (0) is assumed by default.
| A/ | Repeats the last command. |
| A | Attempt to answer a call. |
| AT? | Read the selected S-Register. |
| B(number) | Bell/ITU-T answer sequence. |
| B0 | V.22 connection (1200bps). |
| B1 | Bell 212A connection (1200bps). |
| C(number) | Carrier Control. |
| C1 | Return the OK message. |
| D(number) | Dial the following number. |
| 0-9 | Digits from 0 to 9. |
| * | The "star" digit (only for Tone dialing). |
| # | The "gate" digit (only for tone dialing). |
| A-D | Digits from A to D. |
| L | Redial the last number. |
| P | Pulse dial. |
| T | Tone dial. |
| S=(number) | Dial the number which is stored in the directory (from number 0 to 3). |
| ! | Flash the switch hook. |
| W | Wait for a second dial tone. |
| @ | Dial, wait for quiet answer and continue. |
| , | Dial pause. |
| ; | Return to command mode after dialing. |
| ^ | Toggle between enable tone and disable tone. |
| E(number) | Echo. |
| E0 | Disable Echo. |
| E1 | Enable Echo. |
| H(number) | Disconnect. |
| H0 | Go on-hook. |
| H1 | Go off-hook. |
| I(number) | Identify. |
| I0 | Product code. |
| I1 | Report "OK". |
| I2 | Report "OK" or "Error". |
| I3 | Firmware revision. |
| I4 | OEM identifier string. |
| I6 | Model and internal code revision. |
| L(number) | Speaker volume. |
| L0 | Speaker off. |
| L1 | Speaker low volume. |
| L2 | Speaker medium volume. |
| L3 | Speaker high volume. |
| M(number) | Speaker control. |
| M0 | Speaker always off. |
| M1 | Speaker on until connected. |
| M2 | Speaker always on. |
| M3 | Speaker off during dialing and receiving carrier, on during answering. |
| N(number) | Enable Automode. |
| N0 | Automode off. |
| N1 | Automode on. |
| O(number) | On-line Data mode. |
| O0 | Go on-line. |
| O1 | Go on-line and wait for command. |
| Q(number) | Quiet Result Codes control. |
| Q0 | Allow Result Codes control. |
| Q1 | Do not allow Result Codes control. |
| Sr=(number) | Set register r to (number). |
| Sn? | Display the contents of S-Register (number). |
| V(number) | Result Code Form. |
| V0 | Numeric codes. |
| V1 | Verbal codes. |
| W(number) | Connect Message control. |
| W0 | Speed in EC mode. |
| W1 | Line speed (EC and DTE). |
| W2 | DCE and EC speed. |
| X(number) | Extended Result codes. |
| X0 | Basic Result codes (CONNECT, RING, NO CARRIER etc.). |
| X1 | Basic Result codes and connection speed (CONNECT, RING, ANSWER etc.). |
| X2 | Basic Result codes and connection speeds (CONNECT, RING, ANSWER etc.). |
| X3 | Basic Result codes and connection rate (CONNECT, RING, ANSWER etc.). |
| X4 | All Result Codes and connection rates. |
| Y(number) | Long Space Disconnect. |
| Y0 | Disable. |
| Y1 | Enable. |
| Z(number) | Soft Reset and Restore Profile. |
| Z0 | Restore stored profile 0. |
| Z1 | Restore Stored Profile 1 |
| &$ | Display a list of ampersand (&) commands. |
| &A(number) | Enable/Disable additional result code subsets. |
| &A0 | ARQ result codes disabled. |
| &A1 | ARQ result codes enabled. |
| &A2 | Modulation indicator added. |
| $A3 | Protocol indicators added. |
| &B(number) | Manage serial port rate. |
| &B0 | Connection rate. |
| &B1 | Serial port rate. |
| &B2 | ARQ mode. Variable in non-ARQ mode. |
| &C(number) | Control Carrier Detect Signal. |
| &C0 | CD Override. |
| &C1 | Normal CD operations. |
| &D(number) | DTR Option. |
| &D0 | Ignore On-To-Off DTR transition. |
| &D1 | Switch to On-Line mode and stay connected. |
| &D2 | Normal DTR operations. |
| &D3 | Re-initialize the Modem. |
| &F(number) | Load factory configuration. |
| &F0 | Load factory configuration 0. |
| &F1 | Load factory configuration 1. |
| &G(number) | Select Guard Tone. |
| &G0 | Disable Guard Tone (for the U.S.A.) |
| &G1 | Disable Guard Tone. |
| &G2 | Select 1800Hz Guard Tone. |
| &H(number) | Set Transmit Data flow control. |
| &H0 | Disable flow control. |
| &H1 | Hardware flow control. |
| &H2 | Software flow control. |
| &H3 | Hardware and software flow control. |
| &I(number) | Set Receive Data flow control. |
| &I0 | Enable software flow control. |
| &I1 | XON/XOFF signals to modem and remote system. |
| &I2 | XON/XOFF signals to modem only. |
| &K(number) | Data compression. |
| &K0 | Disable data compression. |
| &K1 | Auto enable/disable data compression. |
| &K2 | Enable data compression. |
| &K3 | Disable MNP5 compression. |
| &M(number) | Asynchronous/Synchronous Mode selection. |
| &M0 | Select Asynchronous Mode. |
| &M1 | Select Synchronous Mode with Asynchronous Off-Line Command Mode. |
| &M2 | Select Synchronous Mode with Asynchronous Off-Line Command Mode. |
| &M3 | Select Synchronous Connect Mode. |
| &Q(number) | Synchronous/Asynchronous Mode. |
| &Q0 | Select Asynchronous Operation. |
| &Q4 | Select Hayes AutoSync Mode. |
| &Q5 | Negotiate an error-corrected link. |
| &Q6 | Select Asynchronous operation in Normal mode. |
| &R(number) | RTS/CTS Option. |
| &R0 | CTS tracks RTS or acts per V.25. |
| &R1 | Active CTS. |
| &S(number) | Override DSR. |
| &S0 | Active DSR |
| &S1 | DSR acts per V.25. |
| &T(number) | Begin test modes. |
| &T0 | End testing. |
| &T1 | Analogue loopback. |
| &T2 | Reserved. |
| &T3 | Local digital loopback. |
| &T4 | Enable remote digital loopback. |
| &T5 | Disable remote digital loopback. |
| &T6 | Indicate remote digital loopback. |
| &T7 | Remote digital with self-test and error detector. |
| &T8 | Analogue loopback with self-test and error detector. |
| &U(number) | Set floor connect speed. |
| &Y(number) | Desingnat a dafault reset Profile. |
| &Y0 | Use Profile 0. |
| &Y1 | Use Profile 1. |
| &Z(number)=x | Store telephone number (number=0 to 3 and string). |
| %C(number) | Data Compression. |
| %C0 | Disable Data Compression. |
| %C1 | Enable MNP5 Data Compression. |
| %C2 | Enable V.42bis Data Compression. |
| %C3 | Enable both MNP5 and V.42bis Data Compression. |
| %E(number) | Line Quality Monitor and Auto-Retrain. |
| %E0 | Disable Line Quality Monitor and Auto-Retrain. |
| %E1 | Enable Line Quality Monitor and Auto-Retrain. |
| %E2 | Enable Line Quality Monitor and Fallback/Fall Forward. |
| %L | Line Siglan Level. |
| %Q | Line Signal Quality. |
| %U(number) | Select u-LAW or A-LAW (K56Flex only). |
| %U0 | Select u-LAW. |
| %U1 | Select A-LAW. |
| \A(number) | Select Maximum MNP Block Size. |
| \A0 | 64 characters. |
| \A1 | 128 characters. |
| \A2 | 192 characters. |
| \A3 | 256 characters. |
| \B(number) | Transmit Break to Remote. |
| \B1 to \B9 | Break length in 100ms units. |
| \N(number) | Operating Mode. |
| \N0 | Select Normal Speed Buffered mode. |
| \N2 | Select Reliable Link Mode. |
| \N3 | Select Auto Reliable Mode. |
| \N4 | Force LAPM Error-Correction Mode. |
| \N5 | Force MNP Error-Correction Mode. |
| +MS | Select Modulation. |
| -SSE-(number) | Enable/Disable DSVD. |
| -SSE=0 | Disable DSVD. |
| -SSE=1 | Enable DSVD. |
| -SMS=x,y,z,t | Select Audio Span/DSVD Mode (voice Modems). |
| ATA | Answer in Voice/Audio Mode. |
| ATD | Dial command in Voice/Audio Mode. |
| ATH | Hang up in Voice/Audio Mode. |
| ATZ | Reset from Voice/Audio Mode. |
| #BDR | Select Baud Rate. |
| #CID | Enable Caller-ID detection. |
| #CLS | Select Data, FAX, or Voice/Audio Mode. |
| #MDL | Identify model. |
| #MFR | Identify manufacturer. |
| #REV | Identify revision level. |
| #SPK | Speakerphone level. |
| #TL | Audio Output transmit level. |
| #VBQ | Query buffer size. |
| #VBS | Bits per sample (ADPCM or PCM). |
| #VBT | Beep tone timer. |
| #VCI | Identify Compression method (ADPCM). |
| #VLS | Voice line select (ADPCM or PCM). |
| #VRA | Ringback goes away timer. |
| #VRN | Ringback never came timer. |
| #VRX | Voice receive mode (ADPCM or PCM). |
| #VSD | Silence detection tuner (ADPCM). |
| #VSK | Buffer skid setting. |
| #VSP | Silence detection period. |
| #VSR | Sampling Rate selection (ADPCM or PCM). |
| #VSS | Silence detection tuner (ADPCM). |
| #VTD | DTMF tone reporting cabability. |
| #VTM | Enabletiming mark placement. |
| #VTS | Generate tone signals. |
| #VTX | Voice transmit mode (ADPCM or PCM). |
| FCLASS=(number) | Set operation mode. |
| FCLASS=0 | Data mode. |
| FCLASS=1 | Facsimile Service Class 1. |
| FCLASS=2 | Facsimile Service Class 2. |
| FCLASS? | Display current FCLASS mode. |
| +FCLASS=? | Display the FCLASS mode options. |
| +FTS=(number) | Stop transmission. |
| +FRS=(number) | Wait for a specified length of silence before sending OK. |
| +FTM=(number) | Transmit data using the modulation specified by (number). (number = 3, 24, 48, 72, 96, 97, 98, 121, 122, 145, 146) |
| +FRM=(number) | Receive data using the modulation specified by (number). (number = 3, 24, 48, 72, 96, 97, 98, 121, 122, 145, 146) |
| +FTH=(number) | Transmit data framed in the HDLC protocol using the modulation specified by (number). (number = 3, 24, 48, 72, 96, 97, 98, 121, 122, 145, 146) |
| +FRH=(number) | Receive data framed in the HDLC protocol using the modulation specified by (number). (number = 3, 24, 48, 72, 96, 97, 98, 121, 122, 145, 146) |
| S0 | Number of rings to Auto-Answer. |
| S1 | Ring Counter. |
| S2 | Escape Character. |
| S3 | Carriage Return Character. |
| S4 | Line Feed Character. |
| S5 | Backspace Character. |
| S6 | Wait Time Before Blind Dialing. |
| S7 | Wait Time Before Carrier Detecting. |
| S8 | Pause Time For Dial Delay. |
| S9 | Carrier Detect Response time. |
| S10 | Lost Carrier to Hang Up Delay. |
| S11 | DTMF Tone Duration. |
| S12 | Escape Prompt Delay. |
| S13 | Bit-mapped register. |
| S15 | Bit-mapped register setup. |
| S18 | Test Timer. |
| S19 | Set duration for the inactivity timer. |
| S21 | Set the length of breaks for MNP or V.42 mode. |
| S22 | ASCII decimal code for the XON character. |
| S23 | ASCII decimal code for the XOFF character. |
| S25 | Delay to DTR. |
| S27 | Bit-mapped register setup. |
| S28 | Eliminate V.32 answer tones. |
| S29 | Duration of the V.21 answer mode. |
| S30 | Disconnect inactivity Timer. |
| S32 | XON Character. |
| S33 | XOFF Character. |
| S34 | Bit-mapper register setup. |
| S37 | Line Connection speed. |
| S38 | Delay before Forced Hang Up. |
| S40 | Autonomous S-Register. |
| S86 | Call Failure Reason code. |
| S91 | PSTN Transmit Level |
| S95 | Extended Result Codes. |