MT9234ZBA-USB-CDC Multi-Tech Systems, MT9234ZBA-USB-CDC Datasheet - Page 6

• Manufacturer Part Number: MT9234ZBA-USB-CDC
• Description: MODEM V.92 DATA/FAX USB WORLD
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® ZBAr

Specifications of MT9234ZBA-USB-CDC

• Data Format: V.34, V.92
• Interface: USB
• Mounting Type: Desktop
• Package / Case: 5.7" L x 4.3" W x 1.0" H (145mm x 109mm x 25mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Other names: 881-1061

Introduction
The AT commands are used to control the operation of your modem. They are called AT commands
because the characters AT must precede each command to get the ATtention of the modem.
AT commands can be issued only when the modem is in command mode or online command mode.
To send AT commands to the modem you must use a communications program, such as the
HyperTerminal applet in Windows or some other available terminal program. 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 auto answer on or off.
The format for entering an AT command is ATXn, where X is the command and n 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”.
You must press ENTER (it could be some other key depending on the terminal program) 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 OK, ERROR, and the CONNECT messages that the
modem sends to the computer when it is connecting to another modem. See a table of valid 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; the
command interpreter ignores them. 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.
Note:
MT9234 builds.
A Note About Fax Commands
Fax
product CD and are posted on the Multi-Tech Web site:
http://www.multitech.com/DOCUMENTS/Families/MultiModemZBA/manuals.asp.
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
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commands
This document applies to all the MT9234 products. However, some commands may not apply to all
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 (+++AT) 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.
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Fax Service Class 1 and Fax Service Class 1.0 Developer's Guide.
Document number: S000262x
Fax Developer's Guide for Classes 2 and 2.0/2.1
Document number: S000239x
Chapter 1 – AT Commands, S-
Registers, and Result Codes
are covered in two separate fax reference guides. These guides are included on the
Chapter 1 – AT Commands, S-Registers, and Result Codes
6