AT Command Summary
Command Description
+++Escape code
| A/ | Repeat last command string | |||
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| A | Answer immediate (incoming call) | |||
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| B0 | CCITT V.22 protocol at 1200 bps | |||
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| B1 | Bell 103/212A protocol at 1200 bps | |||
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| D | Dial; originates a call | |||
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| EO | Echo off (command mode) | |||
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| E1 | Echo on (command mode) | |||
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| H0 | On hook; hangup immediately | |||
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| H1 | Off hook; ready to dial | |||
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| I0 | Returns modem’s product ID code | |||
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| I1 | Returns modem’s ROM checksum | |||
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| Tests modem’s internal memory |
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| L3 | Speaker volume high | |||
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| M0 | Speaker always off | |||
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| M1 | Speaker on until carrier is detected | |||
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| M2 | Speaker always on | |||
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| M3 | Speaker on after last digit dialed; off when carrier is | |||
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| O0 | Return | |||
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| O1 | Return | |||
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