Command |
| Function |
| I1 | Factory ROM checksum test |
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| I2 | Internal memory test |
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| I3 | Firmware ID |
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| I4 | Reserved ID |
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L_ | L0 | Low speaker volume |
| L1 | Low speaker volume |
| L2 | Medium speaker volume |
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| L3 | High speaker volume |
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M_ | M0 | Internal speaker off |
| M1 | Internal speaker on until carrier detected |
| M2 | Internal speaker always on |
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| M3 | Internal speaker on until carrier detected and off while dialing |
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N_ |
| Included for compatibility only, provides no effect |
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O_ | O0 | Return to Data Mode |
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| O1 | Return to Data Mode and initiate an equalizer retrain |
P |
| Set Pulse dial as default |
Q_ | Q0 | Modem sends responses |
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| Q1 | Modem does not send responses |
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Sr? |
| Read and display value in register r. |
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Sr=n |
| Set register r to value n (n = |
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T |
| Set Tone Dial as default |
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V_ | V0 | Numeric responses |
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| V1 | Word responses |
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W_ | W0 | Report DTE speed only |
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| W1 | Report line speed, error correction protocol, and DTE speed. |
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| W2 | Report DCE speed only |
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X_ | X0 | Hayes Smartmodem 300 compatible responses/blind dialing. |
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| X1 | Same as X0 plus all CONNECT responses/blind dialing |
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| X2 | Same as X1 plus dial tone detection |
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| X3 | Same as X1 plus busy detection/blind dialing |
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| X4 | All responses and dial tone and busy signal detection |
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Z_ | Z0 | Reset and retrieve active profile 0 |
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| Z1 | Reset and retrieve active profile 1 |
Extended AT commands
Command |
| Function |
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&C_ | &C0 | Force Carrier Detect Signal High (ON) |
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| &C1 | Turn on CD when remote carrier is present |
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&D_ | &D0 | Modem ignores the DTR signal |
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| &D1 | Modem returns to Command Mode after DTR toggle |
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