Multi-Tech Systems MT3334ZDXV owner manual Modem Does Not Respond to Commands

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MT3334ZDX/V Owner's Manual

The Modem Does Not Respond to Commands

•Make sure the modem is plugged in and turned on. (See “None of the LEDs Light When the Modem Is On.”)

•Make sure you are issuing the modem commands from the data communications software, either manually in terminal mode or automatically once you have configured the software. (You cannot send commands to the modem from the DOS prompt.)

•Make sure you are in terminal mode in your data communications program, then type AT and press ENTER. If you get an OK response, your connections are good and the problem likely is in your phonebook entry or session settings.

•Try resetting your modem by turning it off and on. Make sure there is a reset command (&F) in your initialization string, or your modem may not initialize correctly.

•If you don’t get an OK, the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications 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. Many communications software packages also allow multiple terminals to be open, but only one can access the modem at a time. If your package reports that it cannot make a connection, yet the modem’s TR indicator is on, click on the Window menu to see if more than one terminal is open. The modem’s TR indicator shows that the software has made a connection with the modem through the COM port.

•Your communications software settings may not match the physical port the modem is connected to. The serial cable may be plugged into the wrong connector—check your computer documentation to make sure. Or you may 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 communications software is configured correctly, and you still don’t get an OK, the fault may 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 correct. Check the cable description on the packaging to make sure the cable is the right one for your computer.

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Contents Page Patents Revision DescriptionContents Index Introduction and Description Requirements ComputerSerial Cable Telephone LineData Product FeaturesCommunications Software Installation and Connection About this ManualFax Voice Model MT3334ZDXV onlyAT Commands, S-Registers and Result Codes Testing Your ModemService, Warranty & Technical Support AppendicesInstallation Process Installation IntroductionSafety Warnings Page MultiModemZDX Connections LED Indicators Front PanelInstallation Is Your MultiModemZDX Ready for Use? Operating Your MultiModemZDX Simple OperationsRemote Configuration Software Configuration AT&FcrMultiModemZDX Configuration Confirmation Hardware/Software ConfirmationTroubleshooting None of the LEDs Light When the Modem Is OnModem Does Not Respond to Commands Installation Modem Dials But Cannot Make Connection Installation Modem Cannot Connect When Answering Modem Disconnects While OnlineSlow File Transfer Losing DataGarbage Characters on the Monitor AT Commands, S-Registers Result Codes Command Summary Dial string modifiers Echo Command Mode CharactersDial Monitor Speaker Volume Monitor Speaker ModeEcho Online Data Characters On-Hook/Off-Hook ControlReturn Online to Data Mode Enable/Disable Result CodesModulation Handshake = n Set Register ValueModem Reset Result Code SelectionLong Space Disconnect Data Carrier Detect DCD ControlLoad Factory Default Settings Communications ModeData Terminal Ready DTR Control 22bis Guard Tone ControlATDS=n \N n Error Correction Mode Selection \K n Set Break Control\V n Protocol Result Code Data Compression ControlModem Baud Rate Serial Port Baud RateRegisters Register Unit Seconds Range 255 Default Description S10S11 S28S30 S35S43 S37S42 S48 S89Delayed Terse Verbose DescriptionModem Testing Local Analog Loopback Test/V.54 Loop Local Analog Loopback TestDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Test/V.54 Loop 2 Remote/Auto Digital Loopback Testlocal/manualDigital Loopback Test remote/automatic Limited Warranty Recording Modem Information On-line Warranty RegistrationTech Support Service About the Multi-Tech BBS No Longer Available Logging on to the Multi-Tech BBSDownloading a File If you know the file nameIf you don’t know the file name Reading a MessageLeaving a Message Bulletins Multi-Tech Fax-Back Service No Longer AvailableAbout CompuServe/Internet No Longer Available Appendix a Technical Specifications Intelligent Features Command BufferData Modulation Fax Modulation2400 & 1200 bps 22bis/V.22Carrier Frequencies Fax 21 CH2 Half DuplexConnectors DiagnosticsIndicators Temperature Power Requirement697 770 852 941 Appendix B Tone Dial FrequenciesAppendices MT3334ZDX, MT3334ZDXV Appendices Canadian Limitations Notice Compliance with Babt Requirements European Low Voltage DirectivePage Compliance with BS6789 .1 and Part Compliance with BS6328 PartModem CE Mark EMC and Safety Compliance Modem Commands Default Permissible RangeRegister Default Permissible Range Australian and New Zealand Modem Warning NoticeNew Zealand Telecom Warning Notice Call Attempts/RetriesIndex Error Correction Page MT5634ZDXv Connections Power Supply Index
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