AT Commands
Command | Function | Response |
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%X | Any % command is ignored | OK(0) |
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+X | Any + command is ignored | OK(0) |
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$Xn | Any $ command is ignored including 0 | OK(0) |
| or more digits after the command. |
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S-Registers
S Registers are 1 byte, volatile registers used to store configuration data. They are reset to the default state whenever modem emulation is enabled, or the ATZ/AT&F command is received. They can be saved to flash memory with the AT&W command. When the port is opened, the saved parameters are applied to the port.
Register | Contents | Default |
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S0 | Automatic Answer(# of RING's) | 0 (disabled) |
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S1 | Number of RING's Received | 0 |
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S3 | Command Line Termination Character | CR(13) |
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S4 | Response Formatting Character | LF(10) |
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S5 | Command Line Editing Character | BS(08) |
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S12 | Guard time on either side of the +++ | 50 |
| sequence to break into command mode. |
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| Specified in 50ths of a second. |
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Response Codes
Result Code (ATV1) | Numeric (ATV0) | Reason |
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OK | 0 | Command Successful |
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CONNECT | 1 | Connection Established |
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RING | 2 | Incoming connection awaiting answer |
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NO CARRIER | 3 | Connection Terminated |
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ERROR | 4 | Error in AT command string |
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CONNECT 1200 | 5 | Connected – Serial Port Speed is 1200 baud |
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NO DIALTONE | 6 | Not Used |
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BUSY | 7 | Not Used |
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NO ANSWER | 8 | Not Used |
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CONNECT 2400 | 10 | Connected – Serial Port Speed is 2400 baud |
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CONNECT 4800 | 11 | Connected – Serial Port Speed is 4800 baud |
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CONNECT 9600 | 12 | Connected – Serial Port Speed is 9600 baud |
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CONNECT 14400 | 13 | Connected – Serial Port Speed is 14400 baud |
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Host | 42 |