Hardware
Modem AT Codes
| AT | Attention Code Must appear at start of all commands except A/ and +++ |
| A | Answer Command Answer incoming call |
| A/ | Repeat Last Command |
| Bn | Bell Compatibility |
| B,B0 | Variable connection rate ITU-T (CCITT) Compatibility |
| B1 | Variable connection rate Bell Compatibility |
| B2 | Auto-mode V22/Bell 212A protocols |
| B4 | 300 bps Bell 103 protocol |
| B5 | 1200 bps V22/Bell 212A protocols |
| B6 | 2400 bps V22/bis protocol |
| B7 | 4800 bps V32 protocol |
| B8 | 9600 bps V32 protocol |
| B9 | 14,400 bps V32 bis protocol |
| Ds | Dialing Command |
| DP | Dialing Command Pulse Dialing |
| DR | Dialing Command Reverse |
| DS | Dialing Command Dial one of the srored numbers |
| DT | Dialing Command Tone Dialing |
| D@ | Dialing Command Wait for 5 seconds quiet |
| D, | Dialing Command Pause |
| D; | Dialing Command Resume command mode after dialing |
| D! | Dialing Command Hook Flash |
| E | Echo Command |
| E,E0 | Echo Off |
| E1 | Echo On |
| Hn | Switch-Hook Control |
| H,H0 | On Hook (hang up phone) |
| H1 | Off Hook (pick up phone) |
| In | Request Product Code and Checksum |
| I,I0 | Return Product Code |
| I1 | ROM checksum, product ID, ROM version number |
| I2 | Compute ROM checksum |
| I3 | Error Correctio Code |
| I4 | Product ID, ROM version number, modem chip type, fax operatnig mode |
| Ln | Speaker Volume |
| L,L0,L1 | Speaker Volume Low Volume |
| L2 | Speaker Volume Medium Volume |
| L3 | Speaker Volume High Volume |
| Mn | Monitor on/off |
| M,M0 | Speaker off |
| M1 | Speaker on until online |
| M2 | Speaker always on |
| M3 | Speaker on until online and off while dialing |
| On | Return to online mode |
| O,O0 | Return to online mode |
| O1 | Return to online mode and start retrain sequence |
| O2 | Fall forward Return to online mode |
| O3 | Fall back Return to online mode |
| P | Pulse dialing |
| Qn | Quiet Command |
| Q,Q0 | Display result codes |
| Q1 | Don't display result codes |
| Q2 | Display result codes when originating a call |
| Q3 | Return numeric results 32 and 30 for CONNECT 9600 and CONNECT 4800 |
| Q4 | Return numeric results 12 and 11 for CONNECT 9600 and CONNECT 4800 |
| Sr | Direct Register Command |
| Sn | Select register n as default register |
| Sn? | Read and display value in register n |
| Sn?^ | Read and display value in register n in HEX |
| Sn=N | Set register n to value N |
| Sn=N^ | Set register n to value N in HEX |
| Vn | Verbal/Numeric Result Codes |
| U | Update System password |
| V,V0 | Numeric Result Codes |
| V1 | Verbal Result Codes |
| Xn | Enable Extended Result Code |
| X,X0 | No wait for dial tone No busy CONNECT 0-4 returned |
| X1 | No wait for dial tone No busy CONNECT 0-5 and 9-20 returned |
| X2 | Wait for dial tone No busy CONNECT 0-6 and 9-20 returned |
| X3 | No wait for dial tone Busy recognized CONNECT 0-5,7 and 9-20 returned |
| X4 | Wait for dial tone Busy recognized CONNECT 0-7 and 9-20 returned |
| Y | Long Space Disconnect |
| Z | Reset Command |
| &V | Display al stored profiles |
| &Zn=s | Store telephone number |
| +++ | Escape Code Switch from data mode to command mode |
Adrian Kingsley-Hughes
Last updated: May 4th 2004
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