Specifications

AT Commands and Result Codes
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AT I<n> Identification commands - Requests product information from the modem.
n=0: Returns product identification code.
n=1: Computes the firmware ROM checksum and returns the three-digit result.
n=2: Computes the firmware ROM checksum and returns ERROR if this value
does not match the checksum stored in memory.
n=3: Returns the firmware revision.
n=4: Returns identifier string in Hayes-compatible binary.
n=5: Returns the country code.
n=6: Returns modem data pump model and internal code revision.
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AT M<n> Speaker - Sets speaker control.
n=0: Speaker always OFF.
n=1: Speaker ON until carrier is detected.
n=2: Speaker always ON.
n=3: Speaker goes ON after last digit is dialed, and speaker goes OFF after carrier
is detected.
n=1
AT N<n> Automode detection - Enables or disables automode detection.
n=0: Disables automode detection.
n=1: Enables automode detection.
n=1
AT O<n> Online - Switches the modem from the command mode to data mode.
n=0: Switches the modem to data mode.
n=1: Switches the modem to data mode and requests a retrain sequence.
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AT P Pulse dialing. —
AT Q<n> Result codes - Sets whether the modem driver returns or suppresses result codes.
n=0: Returns result codes.
n=1: Suppresses result codes.
n=0
AT S<n>=<x> Set S-Register - Sets register <n> to decimal value <x>.
n can be a value from 0-27.
x can be a value from 0-255.
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AT S<n>? Query S-Register - Queries the value of the S-register <n>. —
AT T Tone (DTMF) dialing. —
AT V<n> Result codes format - Sets whether results codes are returned as numbers or as
words.
n=0: Returns numeric result codes.
n=1: Returns plain text result codes.
n=1
AT W<n> Selects extended result codes.
n=0: Upon connection, the modem returns the DTE speed.
n=1: Upon connection, the modem returns the line speed, the error control
protocol, and the DTE speed, respectively.
n=2: Upon connection, the modem returns the DCE speed.
n=0
Command Function Default