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MultiMobile

USB

User Guide

AT Commands

AT commands are used to control the operation of your modem. They are so called because each

command must be preceded by the characters

to get the

tention of the modem.

AT commands can be issued only when the modem is in command mode or online command mode.

The modem is in

command mode

whenever it is not connected to another modem. The modem is in

data mode

whenever it is connected to another modem and ready to exchange data.

Online command

mode

is a temporary state in which you can issue commands to the modem while connected to

another modem. To put the modem into online command mode from data mode, you must issue an

escape sequence

(+++) followed immediately by the

characters and the command, e.g., +++ATH

to hang up the modem. To return to data mode from online command mode, you must issue the

command ATO.

To send AT commands to the modem you must use a communications program, such as the

HyperTerminal applet in Windows 95 and NT 4.0, or the communications program included with your

modem. You can issue commands to the modem either directly, by typing them in the terminal window

of the communications program, or indirectly, by configuring the operating system or communications

program to send the commands automatically. Fortunately, communications programs make daily

operation of modems effortless by hiding the commands from the user. Most users, therefore, need to

use AT commands only when reconfiguring the modem, e.g., to turn autoanswer on or off.

The format for entering an AT command is AT

, where

is the command and

is the specific value

for the command, sometimes called the command

parameter

. The value is always a number. If the

value is zero, you can omit it from the command; thus, AT&W is equivalent to AT&W0. Most

commands have a

default

value, which is the value that is set at the factory. The default values are

shown in the “AT Command Summary,” which begins on the next page.

You must press ENTER to send the command to the modem. Any time the modem receives a

command, it sends a response known as a

result code

. The most common result codes are

ERROR

, and the

CONNECT

messages that the modem sends to the computer when it is connecting

to another modem. For a table of valid result codes, see “Result Codes” at the end of this chapter.

You can issue several commands in one line, in what is called a command

string

. The command string

begins with AT and ends when you press ENTER. Spaces to separate the commands are optional;

they are ignored by the command interpreter. The most familiar command string is the

initialization

string

, which is used to configure the modem when it is turned on or reset, or when your

communications software calls another modem.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 83 84

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Table des matières

Television

Contents

Installation

Location

Brightness

Equalizer

MoveOOOOOSkip

Kong/South

Europe/China/Africa/CIS)

(USA/Korea/Philippines)

ProgrammeOedit

Programme

Selecting

(option)

ChildOlock

S-VIDEO VIDEO

S-VIDEO VIDEO L/MONO

Troubleshooting

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