Multitech MT5600BL, MT5600BA manual The Modem Does Not Respond to Commands

Page 42
The Modem Does Not Respond to Commands

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.

Multi-Tech Systems, Inc. MT5600BA/BL Series User Guide (S000276E)

42

Page 41 Page 43
Image 42
Page 41 Page 43
Contents MT5600BA/BL Series Data/Fax Modem User GuideMT5600BA-V.92 MT5600BA-V.90 MT5600BL-V.90 Trademarks MultiModemII User GuideRecord of Revisions PatentsTable of Contents Table of ContentsMultiModemII User Guide None of the Indicators Light Features Chapter 1 - Description and FeaturesAbout AT Commands Product DescriptionSafety Warnings Connect the Modem to Your PC Connect theTwo-Wire Leased LineStep 1 - Connect the Modem to Your System Connect the Modem to the Telephone Line Dialup ConnectionPower-On Test Connect the Four-Wire Leased LineConnect the Modem to the AC Power Outlet Connect the Phone to the Modem OptionalInstalling the Modem Driver for Windows NT Step 2 - Install the Modem DriverInstalling the Modem Driver for Windows 98/Me/2000 XP Removing an Old Modem DriverUsing the Global Wizard Step 3 - Setting Your Country or Region CodeUsing the LCD Panel MT5600BA-V.92 OnlyHow to Change the Country/Region Code Step 4 - Install PhoneToolsUsing AT Commands How to Verify the CodeChapter 3 - Using the Front Panel Modem ConfigurationLED Indicators Liquid Crystal Display LCD Option SelectionMenu Structure Limbs Menu OverviewTrunks BranchesStatus Trunk Limbs TwigsBranches Basic Options TrunkLimbs TwigsBasic Options Trunk, continued Continued from previous pageAdvanced Options Trunk Advanced Options Trunk, continued Remote Configuration Options Trunk Diagnostic Options TrunkLimb Phone Number Memory Options Trunk Caller ID Options TrunkMenu Options StatusBasic Options ASYNC, NORM? Normal asynchronous transmission using the Advanced Options VIEW S-REGISTER SETTINGS. Use the Æ, È, ÇÅ, and Enter buttons to select the number of the S-register whose value you want displayed. To scroll through a list of digits, press the ÇÅ and È buttons. To go to the next position, press the Æ button. To back up or to exit without saving, press the Æ button several times. To display the value, press the Enter button. Same as the Sr? command Remote Configuration Options Diagnostic OptionsPhone Number Memory Options Caller ID Options Two-Wire Setup Chapter 4 - Leased Line OperationFour-Wire Setup Dial Backup and Leased-Line Restoral Dial Backup and Leased Line Restoral Setup10. Press the Æ button to go to the next digit in the number Setup Chapter 5 - Remote ConfigurationBasic Procedure Changing the Remote Configuration PasswordChanging the Remote Escape Character Chapter 6 - Callback Security Setup ProceduresAT Command Method Turning Callback Security On and OffAssigning Callback Passwords AT Command MethodFront Panel Method Assigning Callback Phone Numbers Front Panel MethodCalling Procedure Command #CBN y= - x Store Callback Number Callback Security CommandsCommand #DBn Callback Enable/Disable Command #CBP y= x Store Callback PasswordLocationPasswordPhone Number Callback Assignments FormChapter 7 - Troubleshooting None of the Indicators LightThe Modem Does Not Respond to Commands The Modem Cannot Connect When Dialing The Modem Disconnects While Online The Modem Cannot Connect When Answering File Transfer Is Slower Than It Should BeData Is Being Lost There Are Garbage Characters on the Monitor The 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 loop Introduction Upgrade OverviewAppendix D - Upgrading the Firmware Step 1 - Identify the Modem FirmwareStep 3 - Download the Upgrade File Step 4 - Extract the Upgrade FilesStep 2 - Identify the Current Firmware Version Step 6 - Upgrade the Modem’s Firmware Step 7 - Restore Your ParametersStep 5 - Clear Your Stored Paramenters Standard Linux Serial Port Definitions Appendix E - Installing a Modem Under LinuxUsing the Terminal Program Minicom to Verify Operation InstallationAnswering Calls Using the Modem to Call the InternetCalling the ISP 3. Select Dialup Configuration ToolAppendix F - Pin Descriptions RS-232 Pin DescriptionsRS-232 Cable Pinouts Appendix F - Pin DescriptionsDCE DB-25 connector Leased Line PinoutsDTE Mini-DIN 8-pin connector HSKi CTS HSKo RTSIndex
Top Page Image Contents