Z02215
Single Chip Modem with Integrated Controller, Data Pump, and AFE
26
Table 3. AT Command Set (Continued)
Function and Description
Command
M
Speaker ON/ M0
The speaker is always OFF.
OFF Options
M1
The speaker is ON until the carrier is detected. This value is
the default value in North America.
M2
M3
The speaker is always ON (in this case, the speaker stays
ON after the carrier is detected).
The speaker is off as digits are dialled, but on during
ringback and the until carrier signal is detected.
\N
Asynchronou The \N command determines the path of asynchronous format data through the
s Terminal
Data
Options
modem to the terminal. The data path is set at the start of a telephone line
connection. The Communications Mode Options (&Q) determines whether
terminal data is in asynchronous or synchronous format.
\N0
This command is NORMAL (or buffered) operation. This
mode enables data rate matching between the telephone
line and terminal, and flow control between the modem and
the terminal. In all data modes (V.22bis, V.22, Bell 212A,
V.23, Bell 202, Bell 202T, V.21 and Bell 103), data is
buffered through the modem controller before being
modulated to and from the telephone line.
\N1
This command is the DIRECT operation. This mode does
not enable data rate matching, or flow control between the
modem and the terminal. After the CONNECT message is
displayed, the terminal adjusts the data rate to match the
telephone line rate.
In V.23, V.21, Bell 202, Bell 202T, and Bell 103 data
modes, data from the terminal is directly modulated to and
from the telephone line. In V.22bis, V.22 and Bell 212A data
modes, data from the terminal is converted to
SYNCHRONOUS format using ITU V.14 to adjust for small
(up to 2.5%) timing discrepancies in the data rate without
the use of flow control. This value is the default value.
PS001907-0904
AT Command Set
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