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Chapter 3 - AT Commands, S-Registers and Result Codes
Command: N n Modulation Handshake
Values: n = 0 or 1
Default: 1
Description: N0 Modem performs handshake only at communication standard specified by S37 and the B com-
mand.
N1 Modem begins handshake at communication standard specified by S37 and the B command.
During handshake, fallback to a lower speed can occur.
Command: O n 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 com-
mand or dial modifier is received.
Command: Q n 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: S r = n Set Register Value
Values: r = S-register number; n varies
Default: None
Description: Set value of register S r to value of n , where n is entered in decimal format. E.g., S0=1 .
Command: S r ? Read Register Value
Values: r = S-register number
Default: None
Description: Read value of register S r and display it in 3-digit decimal form. E.g., S2? gives the response
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 com-
mand or dial modifier is received.
Command: V n Result Code Format
Values: n = 0 or 1
Default: 1
Description: V0 Displays result codes as digits (terse response).
V1 Displays result codes as words (verbose response).