Function |
Command |
Syntax |
U.S. Default |
| Escape to online command mode (not preceded by AT) | +++ | +++ | |
| Pause (not preceded by AT) | / | / | 125 ms |
| Answer manually | A | ATA | |
| Repeat last command (not preceded by AT) | A/ | A/ | |
| Dial. | D | ATD | |
| n Phone #, 0 through 9 | |||
| T Tone dial | DT | ATDTn | |
| P Pulse dial | DP | ATDPn | |
| R Call an originate-only modem | DR | ATDR | |
| W Wait for second dial tone (X2, X4) | DTnWn | ATDTnWn | |
| @ Wait for answer (X3, X4) | DTWn@ | ATDTWn@ | |
| , Pause in dialing (S8) | DTn,n | ATDTn,n | 2 secs |
| ! Flash switch hook | DTn!n | ATDTn!n | |
| # Auxiliary tone dial digit | DTn#n | ATDTn#n | |
| * Auxiliary tone dial digit | DTn*n | ATDTn*n | |
| ; Stay in command mode after dialing | DTn;n | ATDTn;n | |
| $ Wait for credit card bong | DTn$n | ATDTn$n | |
| & Wait for credit card bong | DTn&n | ATDTn&n | |
| " Set quote mode for the following: | DTn"n | ATDTn"n | |
| A
Dial 2 B Dial 2 C Dial 2 D Dial 3 E Dial 3 F Dial 3 G Dial 4 H Dial 4 I Dial 4 J Dial 5 K Dial 5 L Dial 5 M Dial 6 N Dial 6 O Dial 6 P Dial 7 R Dial 7 S Dial 7 T Dial 8 U Dial 8 V Dial 8 W Dial 9 X Dial 9 Y Dial 9 |
|||
| Display a list of dial commands | D$ | ATD$ | |
| Redial last number | DL | ATDL | |
| Display last dialed number | DL? | ATDL? | |
| Dial stored number | DSn | ATDSn | |
| Turn command echo off | E0 | ATE0 | No |
| Turn command echo on | E1 | ATE1 | Yes |
| Turn online echo on | F0 | ATF0 | No |
| Turn online echo off | F1 | ATF1 | Yes |
| Hang up (go on-hook) | H0 | ATH0 | |
| Pick up (go off-hook) | H1 | ATH1 | |
| Display the 4-digit product code | I0 | ATI0 | |
| Display the checksum | I1 | ATI1 | |
| Display the RAM test results | I2 | ATI2 | |
| Display the firmware version | I3 | ATI3 | |
| Display the current modem settings | I4 | ATI4 | |
| Display user profiles | I5 | ATI5 | |
| Display the product configuration | I7 | ATI7 | |
| Set modem speaker volume off | L0 | ATL0 | No |
| Set modem speaker volume on | L1 | ATL1 | No |
| Set modem speaker volume on | L2 | ATL2 | Yes |
| Set modem speaker volume on | L3 | ATL3 | No |
| The modem’s speaker is always off | M0 | ATM0 | No |
| The modem’s speaker is on until a connection is made | M1 | ATM1 | Yes |
| The modem’s speaker is always on | M2 | ATM2 | No |
| The modem’s speaker is off during dialing, and on after dialing until the connection is made | M3 | ATM3 | No |
| Return to online mode | O0 | ATO0 | |
| Return to online mode and retrain (automatically return to the highest speed) | O1 | ATO1 | |
| Display the list of S-register settings | S$ | ATS$ | |
| Set S-Register "r" to "n" | Sr=n | ATSr=n | |
| Display the value of S-Register "r" | Sr? | ATSr? | |
| Display result codes in numeric form | V0 | ATV0 | No |
| Display result codes in verbose form (words) | V1 | ATV1 | Yes |
| 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 | X0 | ATX0 | No |
| Report basic call progress result codes and the connect rates—OK, CONNECT, RING, NO CARRIER (also, for busy, if enabled, and dial tone not detected), NO ANSWER, CONNECT XXXX and ERROR | X1 | ATX1 | No |
| Report basic call progress result codes and the connect rates i.e., OK, CONNECT, RING, NO CARRIER (also, for busy, if enabled), NO DIAL TONE, NO ANSWER, CONNECT XXXX and ERROR | X2 | ATX2 | No |
| Report basic call progress result codes and connection rate i.e., OK, CONNECT, RING, NO CARRIER, NO ANSWER, CONNECT XXXX, BUSY and ERROR | X3 | ATX3 | No |
| 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 | X4 | ATX4 | Yes |
| On the next reset, use &W0 settings | Y0 | ATY0 | Yes |
| On the next reset, use &W1 settings | Y1 | ATY1 | No |
| On the next reset use, &F0 settings | Y2 | ATY2 | No |
| On the next reset, use &F1 settings | Y3 | ATY3 | No |
| On the next reset, use &F2 settings | Y4 | ATY4 | No |
| Reset the modem according to the settings of ATY | Z0 | ATZ0 | |
| Reset the modem and use &W0 settings | Z1 | ATZ1 | |
| Reset the modem and use &W1 settings | Z2 | ATZ2 | |
| Reset the modem using &F0 settings and load factory default profile 1 | Z3 | ATZ3 | |
| Reset the modem using &F1 settings and load factory default profile 0 | Z4 | ATZ4 | |
| Reset the modem using &F2 settings and load factory default profile 2 | Z5 | ATZ5 | |
| Display the list of AT commands | $ | AT$ | |
| Display the list of ampersand commands | &$ | AT&$ | |
| Disable data compression result codes | &A0 | AT&A0 | No |
| Enable data compression result codes | &A1 | AT&A1 | No |
| Enable modulation result codes | &A2 | AT&A2 | No |
| Enable data compression result codes and add V.42bis and MNP 5 protocol indicators | &A3 | AT&A3 | Yes |
| Use a floating DTE speed | &B0 | AT&B0 | No |
| Use a fixed DTE speed | &B1 | AT&B1 | Yes |
| Use a fixed DTE speed when using data compression | &B2 | AT&B2 | No |
| Carrier detect is always on | &C0 | AT&C0 | No |
| Carrier detect is controlled by the modem. | &C1 | AT&C1 | Yes |
| Ignore DTR | &D0 | AT&D0 | No |
| Use online command mode | &D1 | AT&D1 | No |
| DTE controls DTR | &D2 | AT&D2 | Yes |
| Set the factory profile that uses hardware (RTS/CTS) flow control (this is the active profile when the modem is shipped) | &F0 | AT&F0 | |
| Set the factory profile that uses hardware (RTS/CTS) flow control | &F1 | AT&F1 | |
| Set the factory profile that uses software (XON/XOFF) flow control | &F2 | AT&F2 | |
| No guard tone | &G0 | AT&G0 | Yes |
| Use 550 Hz guard tone | &G1 | AT&G1 | No |
| Use 1800 Hz guard tone | &G2 | AT&G2 | No |
| Flow control for transmitted data - Disable flow control | &H0 | AT&H0 | No |
| Flow control for transmitted data - Enable hardware flow control (RTS/CTS) | &H1 | AT&H1 | Yes |
| Flow control for transmitted data - Enable software (XON/XOFF) | &H2 | AT&H2 | No |
| Flow control for received data - Disable flow control | &I0 | AT&I0 | Yes |
| Flow control for received data - send XON/XOFF signals to modems on both ends | &I1 | AT&I1 | No |
| Flow control for received data - send XON/XOFF signals to your modem only | &I2 | AT&I2 | No |
| HP Eng/Ack in Host mode | &I3 | AT&I3 | No |
| HP Eng/Ack in Terminal Mode | &I4 | AT&I4 | No |
| Flow control for received data - If error correction is used, send XON/XOFF signals to your modem only; if data compression is not used, look for incoming XON/XOFF | &I5 | AT&I5 | No |
| Disable data compression | &K0 | AT&K0 | No |
| Enable data compression (V.42bis, MNP 5, NONE) | &K1 | AT&K1 | Yes |
| Enable data compression (forces V.42bis) | &K2 | AT&K2 | No |
| Use selective data compression | &K3 | AT&K3 | No |
| Disable error correction in 1200bps and faster transfers | &M0 | AT&M0 | No |
| Allow V.42 or MNP error correction in 1200bps and faster transfers | &M4 | AT&M4 | Yes |
| Allow either V.42 or MNP error correction in 1200bps and faster transfers | &M5 | AT&M5 | No |
| Ignore RTS | &R1 | AT&R1 | No |
| Receive to DTE/RTS high | &R2 | AT&R2 | Yes |
| Data Set Ready (DSR) is always on | &S0 | AT&S0 | Yes |
| Data Set Ready (DSR) signals that the modem is ready to send data | &S1 | AT&S1 | No |
| Write (store) user profile 0 to memory | &W0 | AT&W0 | |
| Write (store) user profile 1 to memory | &W1 | AT&W1 | |
| Store phone number | &Zn=s | AT&Zn=s | |
| Display phone number | &Zn? | AT&Zn? | |
| Display currently selected country | +GCI? | AT+GCI? | |
| Display available countries and their codes | +GCI=? | AT+GCI=? | |
| Set the current country configurations (determine the correct country code by issuing +GCI?) | +GCI=nnn | AT+GCI=nnn |