Recovering At Commands - Paradyne COMSPHERE 3830 User Manual

To establish a connection with a remote modem, use the D (Dial)
command. Refer to Chapter 4,
more information.

Recovering AT Commands

AT commands are issued from asynchronous terminals and personal
computers. Certain dialing methods, such as V.25bis and synchronous
operation, disable the use of AT commands and place the modem into a
state known as Dumb mode. The Model 3830 is capable of normal
operation when in Dumb mode. However, if the setting of a
configuration option must be changed, it can only be accomplished
using an AT command.
The AT Recovery command (AT***) places the modem into a
temporary state that restores AT commands. When in this state, the
modem's previous settings are retained except for the following
configuration options:
The DTE Dialer Type configuration option (&M and &Q) is set
to AT
The Async/Sync Mode configuration option (&M and &Q) is set
to Async
The DSR Control configuration option (&S) is set to Forced On
The LSD Control configuration option (&C) is set to Forced On
If these settings are not appropriate, then change them to a setting
compatible with your current application.
The procedures for an AT recovery using an asynchronous terminal or
personal computer are listed in the following section. Read through
these procedures before performing a recovery:
1. Turn the modem Off and then ON. The modem performs a
power-up self-test in which all LEDs light. While this is running,
repeatedly press the A key of your DTE's keyboard (or keep the
key depressed if your keyboard automatically repeats characters
that way). Keep doing this until A's (or a's) appear on your DTE
screen. (You may use all uppercase or all lowercase characters.)
At least three consecutive A's must be entered within a 2-second
time interval.
3830-A2-GB91-30
2. Model 3830 Modem Installation
AT Commands and
August 1998
S-Registers, for
2-9