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Chapter 4 - AT Commands, S-Registers and Result Codes
Command: M
n
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: 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
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: 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
command 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 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.