Multi-Tech Systems MT5634MSV manual AT Commands

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MessageSaver 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 AT to get the ATtention 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 mo- dem 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 AT 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 communica- tions program included with your modem. You can issue commands to the modem either directly, by typing them in the terminal window of the communications pro- gram, or indirectly, by configuring the operating system or communications pro- gram 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 mo- dem, e.g., to turn autoanswer on or off.

The format for entering an AT command is ATXn, where X is the command and n is the 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 OK, 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 sepa- rate 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.

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Contents User Guide FCC Part User Guide Record of Revisions MessageSaver Operation IntroductionQuick Start Solving Problems AT Commands, S-Registers & Result CodesRemote Configuration PhoneToolsAppendix a Regulatory Compliance Appendix C Loopback TestsAppendix D Warranty, Service, and Technical Support Appendix E Upgrade ProceduresIntroduction Introduction Product Description What Is in Your Modem Package? How to Get a Copy of Your User Guide Related ManualsMessageSaver User Guide Quick Start What You Will Need Safety WarningsIntroduction We supplyOpening the Modem Mount the FeetSelect Stereo or Mono Speaker Changing the Speaker Jumper Location of speaker jumperLine Connection Connect the Modem to Your SystemRS232 Connection Phone Connection Power ConnectionPower-On Test Microphone ConnectionRemoving Your Old Modem from Windows Install the Modem in WindowsAdding the Modem to Windows Install and Configure Your Software Call the Multi-Tech BBS Windows HyperTerminal Windows Terminal Send a Fax Microsoft FaxSelect Start Programs Accessories Fax Compose new fax ReferencesMessageSaver User Guide MessageSaver Operation PhoneTools Features Independent Mode FunctionsRecording and Downloading an Announcement MessageSaver OperationIndependent Mode Operation in PhoneTools Independent Mode Configuration Dialog BoxIndependent Mode Control Dialog Box Independent Mode Control dialog boxIndependent Mode Operation Using the Front Panel Control ButtonsIndicator Lights Playing Voice Messages Adjusting Speaker VolumeAnswering a Call with the Speakerphone Stopping the Play of Voice MessagesControlling the MessageSaver Remotely Remote ControlUsing the MessageSaver in Speakerphone Mode Activating Independent Mode Remotely Remote Control KeysAT Commands Registers Result Codes AT Commands AT Command Summary Echo Online Data Characters Echo Command Mode CharactersDS=y Dial Stored Telephone Number Hook ControlReturn Online to Data Mode Monitor Speaker VolumeMonitor Speaker Mode Modulation HandshakeSr? Read Register Value Result Codes Enable/DisableSet Register Value Tone DialingAuto Retrain Modem ResetLong Space Disconnect Data Carrier Detect DCD ControlAsynchronous Communications Mode Load Factory SettingsCommunications Mode 22bis Guard Tone ControlStore Current Configuration Test CommandsDisplay Current Settings Select Stored Configuration for Hard Reset\Gn Modem Port Flow Control \An\Bn Transmit Break \Jn Data Buffer Control\Qn Flow Control Selection \Nn Error Correction Mode Selection\Tn Inactivity Timer \Xn XON/XOFF Pass-Through DCn AT Command Control\Vn Protocol Result Code Data Calling Tone#S=x Store Setup Password Command +ES=n Enable Synchronous Buffered Mode#Sx Enter Setup Password Command +++ATCR Escape SequenceRegister Unit Range Default Description RegistersRegister Unit Range Default Description S37 Register Unit Range Default Description S42 Result Codes Terse Verbose DescriptionBlacklist Full Remote Configuration Changing the Setup Password Basic ProcedureSetup Changing the Remote Escape Character MessageSaver User Guide Solving Problems None of the Indicators Light Modem Does Not Respond to Commands Modem Dials But Cannot Connect Modem4Disconnects While Online Data Is Being Lost Modem4Cannot Connect When AnsweringFile Transfer4Is Slower Than It Should Be Fax and Data4Software Can’t Run at the Same Time There Are Garbage4 Characters on the MonitorModem4Doesn’t Work with Caller ID MessageSaver User Guide PhoneTools Installing PhoneTools Making a Phone Call Using PhoneTools’ Status BarPhone Module Using the Speakerphone Making Quick Dial EntriesActivating and Deactivating Answerphone Setting up AnswerphoneVoice Module Setting Up the Answer Only Mode Setting Up the Answer/Record ModeListening to Received Messages from a Remote Phone Listening to Received Messages in PhoneToolsRecording an Announcement Changing Recording ParametersHow Does It Work? Independent ModeConfiguring and Controlling Independent Mode Operation Activating and Configuring Independent Mode Selecting an AnnouncementIndependent Mode Managing Stored Documents InboxFax Module Faxing a Document from a Windows ApplicationFaxing a File Directly from PhoneTools Sending a CoverAdding a Logo to the Cover Viewing and Printing FaxesInbox and Outbox Management Inbox ManagementOutbox Management Importing Existing Records Phone BookCreating New Records Selecting RecordsUsing the Phone Book for Dialing Terminal Emulation Module Starting a Modem ConnectionUploading Files to a Remote System Capturing Information to DiskData File Transfer Sending a Data File AutomaticallyReceiving a Data File Automatically Appendixes Appendix a Regulatory Compliance FCC Part 68 TelecomFax Branding Statement Regulatory ComplianceCommission Decision CTR21 Canadian Limitations NoticeInternational Modem Restrictions EMC and Safety Compliance New Zealand Telecom Warning NoticeMessageSaver User Guide Appendix B Technical Specifications Carrier Frequencies Frequency Stability MessageSaver User Guide Test procedure Local Analog Loopback Test V.54 LoopRemote Digital Loopback Test V.54 Loop Figure C-2. Remote digital loopback testLocal Digital Loopback Test V.54 Loop Figure C-3. Local digital loopback testMessageSaver User Guide Limited Warranty ServiceMulti-Tech BBS Online Warranty RegistrationTechnical Support About the Internet SupplyNet Online Ordering Instructions Modem AccessoriesAbout the Multi-Tech Fax-Back Service Upgrade Overview Identify the Modem FirmwareMulti-Tech BBS Identify the Current Firmware VersionMulti-Tech Web Site Clear Your Stored Paramenters Download the Upgrade FileExtract the Upgrade Files Upgrade the Modem’s Firmware Restore Your ParametersIndex Symbols Index 106
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