Z02215
Single Chip Modem with Integrated Controller, Data Pump, and AFE
32
Table 3. AT Command Set (Continued)
Command
Function and Description
\R
Minitel line During V.23 Minitel connections, B4 and S-register S37 are 1. When the
reversal
using RTS
Options
modem is transmitting at 75 bps, it can be configured to perform a Minitel line
reversal when RTS changes from ON to OFF.
To perform a Minitel line reversal, the modem transmitting at 75 bps changes its
transfer rate to1200 bps (transmit) and 75 bps (receive). If the remote modem
supports and is configured for Minitel operation with line reversals, it
automatically detects the rate switch and changes its own transmit and receive
data rates. See the section on See “Minitel Line Reversal” on page 44 for
details.
\R0
This option does not execute a Minitel line reversal when
RTS changes from ON to OFF. This value is the default
value.
\R1
This option performs a Minitel line reversal when RTS
changes from ON to OFF.
Sn
&S
Sets the
current
S-register
to n
The Sn command sets the current S-register to the value n selected by the
user. For example, ATS7 sets the current S-register to S7. The default value is
0. Sn addresses a particular S-register number so future commands like ? and
= reads or writes the S-register. Modem reset and the &F command select S0
as the default S-register.
Data Set
Ready
The &S command controls Data Set Ready. If &Q1, &Q2 or &Q3
(SYNCHRONOUS mode) is selected, the modem's DSR signal operates as if
&S1 is set. If &Q0 (ASYNCHRONOUS mode) has been selected:
&S0
This option forces DSR always ON. This value is the default
value in North America.
&S1
This option causes the modem's DSR signal to be ON at
the start of handshaking and OFF when the modem is
retraining or in the IDLE state.
,
Pause
,
Comma (,) makes the modem pause for a length of time in
S-register S8 before processing the next character in the
command line.
?
Read an
S-Register
?
The ? command displays the value of the last S-register
named in the Sn command.
=x
Write an
S-register
=x
The =x command writes the value x to the last S-register
named in the Sn command. The range of valid values for x
depends upon the S-register being written. The value 0 is
assumed if no value is provided for x.
T
Tone Dialing T
Selects the tone method of dialing.
PS001907-0904
AT Command Set
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