Multitech MT5600BAV.92, MT5600BAV.90, MT5600BLV.90 manual Modem Does Not Respond to Commands

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Chapter 7 - Troubleshooting

The Modem Does Not Respond to Commands

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

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

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

·Your communication software settings may not match the physical port the modem 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 connection.

·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 in 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 one for your computer.

·Peripheral expansion cards, such as sound and game cards, might include a serial 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, click Advanced, and select the new port address and/or interrupt. If you wish to use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4 with COM2, so you should change their IRQs to unused ones, if possible.

MT5600BA/BL Series User Guide

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Contents MT5600BA/BL Series MT5600BA-V.92 MT5600BA-V.90 MT5600BL-V.90Revision Date Description Table of Contents Contents Description and Features FeaturesProduct Description Safety Warnings Installation Connect the Modem to Your SystemConnect the Phone to the Modem Optional Install the Modem Driver Removing an Old Modem DriverCountry Code Configuration MT5600BA-V.92 OnlyInstall Phone Tools Using the Front Panel Modem ConfigurationLED Indicators Liquid Crystal Display LCD Option SelectionMenu Structure Menu Overview TwigsStatus Trunk Basic Options Trunk From previous Advanced Options Trunk Advanced Options Trunk Remote Configuration Options Trunk Diagnostic Options TrunkPhone Number Memory Options Trunk Caller ID Options TrunkMenu Options StatusBasic Options Using the Front Panel Advanced Options Using the Front Panel Remote Configuration Options Diagnostic OptionsPhone Number Memory Options Caller ID Options Two-Wire Setup Leased-Line OperationFour-Wire Setup Dial Backup and Leased-Line Restoral Dial Backup and Leased Line Restoral SetupLeased Line Operation Remote Configuration Changing the Remote Escape Character Setup Procedures Callback SecurityAssigning Callback Passwords Front Panel MethodAssigning Callback Phone Numbers Calling Procedure Callback Security Commands Callback Enable/DisableCallback Assignments Form Troubleshooting None of the Indicators LightModem Does Not Respond to Commands Modem Cannot Connect When Dialing Modem Disconnects While Online Modem Cannot Connect When Answering File Transfer Is Slower Than It Should BeData Is Being Lost There Are Garbage Characters on the Monitor Modem Doesn’t Work with Caller IDFax and Data Software Can’t Run at the Same Time Appendix a Regulatory Compliance FCC Part 68 TelecomFax Branding Statement Canadian Limitations NoticeEMC, Safety, and R&TTE Directive Compliance International Modem RestrictionsNew Zealand Telecom Warning Notice South African Notice Appendix B Technical Specifications Modem CompatibilityTransmission Level Appendix C Warranty, Service, Technical Support Multi-Tech Systems, Inc. Warranty & Repairs PoliciesOnline Warranty Registration Service Repair Procedures for International DistributorsReplacement Parts International Customers outside U.S.A. and CanadaTechnical Support Internet SitesIntroduction Upgrade OverviewAppendix D Upgrading the Firmware Identify the Modem FirmwareDownload the Upgrade File Extract the Upgrade FilesIdentify the Current Firmware Version Upgrade the Modem’s Firmware Restore Your ParametersClear Your Stored Paramenters Appendix E Installing a Modem Under Linux Using the Modem to Call the Internet Appendix F Pin Descriptions RS-232 Pin DescriptionsRS-232 Cable Pinouts RDLLeased Line Pinouts Fig. F-3. Macintosh cableIndex Index
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