Paradyne COMSPHERE 3830 Bedienerhandbuch

Update to COMSPHERE 3800 Series Modems

Model 3830 User’s Guide (3830-A2-GB91-00)

Document No. 3830-A2-GB41-00

July 1994

The COMSPHERE 3800 Series Modems,

Model 3830, User’s Guide (3830-A2-GB91-00)

inaccurately describes the AT command recovery

process. The corrected information in this update sheet

will be incorporated into future releases of the User’s

Guide. In the meantime, keep this document with your

User’s Guide.

Recovering AT Commands

AT commands are issued from asynchronous

terminals and personal computers. Certain dialing

methods, such as V.25 bis 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.

If these characters are not echoed back to the

DTE screen after the power-up self-test is

complete, then the modem is still in Dumb mode

and maintains its current configuration. Turn the

modem Off and then ON again, and repeat Step

2. Once the characters are echoed back to the DTE,

TYPE: T***

(The case of this character must be consistent

with the case used in Step 1. Mixed case

prefixes such as aT or At are not recognized.)

This must be entered within 10 seconds after

receiving the echoed characters.

PRESS: Enter

The screen displays OK.

The modem is now in AT Recovery mode, and

remains in this state until a Save or power reset

occurs. While in this mode, you can use AT

commands to make any necessary changes to

configuration options.

Keep in mind that the &C command is changed

to Forced On (&C0), the &M and &Q

commands are changed to Async mode with AT

commands enabled (&M0 and &Q0), and the

&S command is changed to Forced On (&S0). If

these settings are not appropriate, then reset

them to a desired choice before exiting AT

Recovery mode.

3. To save changes, use the &W command:

TYPE: AT&Wn

Where: nis one of the following storage areas:

0 for Active (Saved)

1 for Customer 1

2 for Customer 2

PRESS: Enter

The modem exits AT Recovery mode and

returns to its previous application environment.

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