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Chapter 4 - AT Commands, S-Registers and Result Codes
Command: Mn Monitor Speaker Mode
Values: n = 0, 1, 2, or 3
Default: 1
Description:M0 Speaker always off.
M1 Speaker on until carrier signal detected.
M2 Speaker always on when modem is off-hook.
M3 Speaker on until carrier is detected, except while dialing.
Command: Nn Modulation Handshake
Values: n = 0 or 1
Default: 1
Description:N0 Modem performs handshake only at communication standard specified by S37 and the B
command.
N1 Modem begins handshake at communication standard specified by S37 and the B com-
mand. During handshake, fallback to a lower speed can occur.
Command: On Return Online to Data Mode
Values: 0, 1, 3
Default: None
Description:O0 Exit online command mode and return to data mode (see +++AT<CR> escape sequence ).
O1 Issue a retrain and return to online data mode.
O3 Issue a rate renegotiation and return to data mode.
Command: P Pulse Dialing
Values: P, T
Default: T
Description: Configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed until a T
command or dial modifier is received.
Command: Qn Result Codes Enable/Disable
Values: n = 0 or 1
Default: 0
Description:Q0 Enable result codes.
Q1 Disable result codes.
Q2 Returns an OK for backward compatibility with some software.
Command: Sr=n Set Register Value
Values: r = S-register number; n varies
Default: None
Description: Set value of register Sr to value of n, where n is entered in decimal format. E.g., S0=1.
Command: Sr? Read Register Value
Values: r = S-register number
Default: None
Description: Read value of register Sr and display it in 3-digit decimal form. E.g., S2? gives the re-
sponse 043.
Command: T Tone Dialing
Values: P, T
Default: T
Description: Configures the modem for DTMF (touch-tone) dialing. Dialed digits are tone dialed until a P
command or dial modifier is received.
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