Multi-Tech Systems MT5600BL, MT5600BA manual Modem Does Not Respond to Commands, Solving Problems

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8 Solving Problems

The Modem Does Not Respond to Commands

Make sure the modem is plugged in and turned on. (See “None of the Indicators

4Light.”)

Make sure you are issuing the modem commands from data communication software, either manually in terminal mode or automatically by configuring the

4software. (You cannot send commands to the modem from the DOS prompt.)

Make sure you are in terminal mode in your data communication program, then type AT and press ENTER. If you get an OK response from your modem, your connections are good and the problem likely is in the connection setup in your

4communication software.

Try resetting your modem by turning it off and on. If you are using DOS or Win- dows 3.1 communication software, make sure the initialization string includes &F as the first command, to cancel any “leftover’ command that could affect the

4modem’s operation.

If you don’t get an OK, the problem may still be in the communication software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communication programs connect to the COM port automati- cally. Some connect when the software loads and remain connected until the program terminates. Others can disconnect without exiting the program. The modem’s TR indicator lights to show that the software has taken control of the

4modem through the COM port.

Your communication software settings may not match the physical port the mo- dem is connected to. The serial cable might be plugged into the wrong connector—check your computer documentation to make sure. Or you might have selected a COM port in your software other than the one the modem is physically connected to—compare the settings in your software to the physical

4connection.

If the modem is on, the cable is plugged into the correct port, the communication software is configured correctly, and you still don’t get an OK, the fault might be

4in the serial cable. Make sure it is firmly connected at both ends.

Is this the first time you have used the cable? If so, it may not be wired correctly. Check the cable description on the packaging to make sure the cable is the right

4one for your computer.

Peripheral expansion cards, such as sound and game cards, might include a seri- al port preconfigured as COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory address, or interrupt request (IRQ) as your communication port. Be sure to disable any unused ports.

Windows 3.1x: To look for address or IRQ conflicts, in Program Manager select File Run, type MSD, and press ENTER. Then select Mouse, COM Ports, and IRQ Status, and note the addresses and IRQs that are in use. If you find an IRQ conflict, note which IRQs are not being used, then change one of the conflicting devices to use one of the unused IRQs. If you find an address conflict, change the address of one of the conflicting devices.

To change a port address or IRQ in Windows 3.1x, double-click the Control Panel icon, then the Ports icon. Click on the port you want to change, click Settings,

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Contents Model MT5600BA Model MT5600BL Record of Revisions FCC Part Introduction Using the Front PanelQuick Start MultiModemII User GuideRemote Configuration AT Commands, S-Registers & Result CodesSolving Problems Callback SecurityAppendix a Regulatory Compliance Appendix D Warranty, Service, and Technical SupportAppendix C Loopback Tests Appendix E Upgrading the ModemContents Viii Introduction Introduction FeaturesProduct Description Data IntroductionRelated Manuals What Is in Your Modem Package?Quick Start What You Will Need Safety WarningsWe supply You supplyRS232 Connection Connect the Modem to Your SystemDialup Connection Quick StartFour-Wire Leased Line Connection Two-Wire Leased Line ConnectionPower Connection Power-On TestAdding the Modem to Windows Install the Modem in WindowsRemoving Your Old Modem from Windows Install and Configure Your Software Trio DataComm Call the Multi-Tech BBSWindows HyperTerminal Windows Terminal Trio Fax Send a FaxMicrosoft Fax References Select Start Programs Accessories Fax Compose new faxMultiModemII User Guide Using the Front Panel LED Indicators Modem ConfigurationLiquid Crystal Display LCD Using the Front PanelOption Selection Menu StructureMultiModemII User Guide Menu Overview Using the Front Panel Status Trunk MultiModemII User Guide Basic Options Trunk Using the Front Panel Advanced Options Trunk Diagnostic Options Trunk MultiModemII User Guide Remote Configuration Options TrunkCaller ID Options Trunk Using the Front Panel Phone Number Memory Options TrunkStatus Menu OptionsUsing the Front Panel Basic Options Implemented Advanced OptionsRemote Configuration Options Phone Number Memory Options MultiModemII User Guide Diagnostic OptionsCaller ID Options AT Commands Registers Result Codes Introduction AT Commands, S-Registers, and Result Codes AT CommandsDS= y Dial Stored Telephone Number Echo Command Mode CharactersHook Control Information RequestMonitor Speaker Mode Monitor Speaker VolumeReturn Online to Data Mode Result Codes Enable/DisableSet Register Value Select RegisterRead Register Value Tone DialingResult Code Selection Modem ResetLong Space Disconnect Data Carrier Detect DCD ControlLoad Factory Settings Error Correction ModesData Terminal Ready DTR Control Modem-Initiated Flow Control22bis Guard Tone Control Communications ModeFlow Control Selection Test Commands Sync/Async ModeClear to Send CTS Control Data Set Ready DSR ControlStore Current Configuration Display Current ConfigurationDisplay Last Connection Statistics Synchronous Clock SourceLine Signal Level Select Profile for Hard ResetZy =x Store Telephone Number Data Compression ControlPCM Code Selection Line Signal Quality\An Maximum MNP Block Size \Bn Transmit Break\Vn Single Line Connect Message \Nn Error Correction Mode SelectionReserved,maxTXrateCR +MS= Modulation SelectionMNP Extended Services Command #CBNy=x Store Callback Number Command -SDR=nDistinctive Ring ControlCommand #CBPy=x Store Callback Password Flash Memory DownloadCallback Enable/Disable Command #CID= n Caller IDCommand $SBn Serial Port Baud Rate Escape SequenceRegisters Register Unit Range Default DescriptionS32 S36 S46 Terse Verbose Description Result CodesProtocol ALT +FCERROR MultiModemII User Guide Remote Configuration Setup Basic ProcedureChanging the Remote Configuration Password Changing the Remote Escape Character Remote ConfigurationMultiModemII User Guide Callback Security Turning Callback Security On and Off Setup ProceduresCallback Security Assigning Callback PasswordsAssigning Callback Phone Numbers Callback Security Commands Calling ProcedureCommand #CBN y= x Store Callback Number Command #CBPy=x Store Callback Password Callback Assignments MultiModemII User Guide Leased Line Operation Two-Wire Setup Leased Line Operation Four-Wire SetupDial Backup and Leased Line Restoral Setup Dial Backup and Leased Line RestoralLeased Line Operation MultiModemII User Guide Solving Problems None of the Indicators Light Solving Problems Modem Does Not Respond to CommandsModem Dials But Cannot Connect Modem4Disconnects While Online File Transfer4Is Slower Than It Should Be Modem4Cannot Connect When AnsweringThere Are Garbage4 Characters on the Monitor Data Is Being LostModem4Doesn’t Work with Caller ID Fax and Data4Software Can’t Run at the Same Time Appendixes FCC Part 68 Telecom Appendix a Regulatory ComplianceRegulatory Compliance Fax Branding StatementInternational Modem Restrictions Canadian Limitations NoticeCommission Decision CTR21 New Zealand Telecom Warning Notice EMC, Safety, and Terminal Directive ComplianceAppendix B Technical Specifications Technical Specifications Receiver Sensitivity Local Analog Loopback Test V.54 Loop Test procedureLoopback Tests Figure C-2. Remote digital loopback test Remote Digital Loopback Test V.54 LoopFigure C-3. Local digital loopback test Local Digital Loopback Test V.54 LoopBack-to-Back Test Figure C-5. Back-to-back test connections Service Limited WarrantyWarranty, Service, and Technical Support Online Warranty RegistrationTechnical Support Multi-Tech BBSAbout the Internet SupplyNet Online Ordering Instructions Ordering Modem AccessoriesIdentify the Modem Firmware Upgrade OverviewMulti-Tech Web Site Identify the Current Firmware VersionMulti-Tech BBS Upgrading the ModemExtract the Upgrade Files Download the Upgrade FileSet the Modem to the Factory Defaults Restore Your Parameters Upgrade the Modem’s FirmwareRS-232 Pinouts Appendix F Cable PinoutsCable Pinouts Leased Line PinoutsCtrl Code Hex Dec Appendix G Ascii Character MapIndex 108 Index 110
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