MaxTech V.42bis, V.32bis user manual Modem does not respond to commands, Modem does not dial

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CONNECT 9600/REL-LAPM V.42BIS

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CONNECT 12000/REL-LAPM V.42BIS

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CONNECT 14400/REL-LAPM V.42BIS

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Section Six - Troubleshooting

This section describes some of the common problems you may encounter while using your modem. If you can not resolve your difficulty after reading this chapter, contact your dealer or vendor for assistance.

Modem does not respond to commands.

1.Make sure the modem is not configured with a conflicting COM port and IRQ setting (see Section 2.4). Your modem can not be configured as COM1 (default) if another device in your system is also configured as COM1. Similarly, IRQ settings may not overlap.

2.Make sure the communication software is configured to “talk” to the modem on the correct COM port and IRQ setting (same COM port and IRQ setting as the modem). Your communication software must know which address your modem is using in the system in order to pass data to it. Similarly, IRQ settings must be set correctly to receive data from the modem.

3.Make sure that your modem is initialized correctly. Your modem may have been initialized to not display responses. You may factory-reset the modem by issuing AT&F and press ENTER. The factory default allows the modem to display responses after a command has been executed.

4.Make sure the baud rate setting in your software is set to 57600, 38400, 19200, 14400, 9600, 2400, 1200, or 300 bps. An incorrect baud rate prevents the modem from operating properly.

Modem does not dial.

1.Make sure the modem is connected to a working phone line. Replace the modem with a working phone to ensure that the phone line is working.

2.Make sure the phone line is connected to the jack marked “LINE.” Incorrect connection prevents the modem from operating properly. Refer to Section 2.2 for modem connec- tion instructions.

Modem dials but does not connect.

1.Make sure the IRQ setting is identical on both the modem AND the software. Modem and software must be configured

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Contents Contents Hardware Installation Unpacking Your ModemSoftware Installation/Configuration Fasten the retaining bracketPage COM Port and Interrupt Settings Devices in your computer cannot share an IRQ withTesting Your Modem After Installation Using Your ModemExecuting Commands Where To Go From HereCommand Structure Basic AT Commands Extended AT Commands Mode after DTR toggle Guard tone disabledForce DSR Signal High on Enable Trellis Coding @22bis auto-retrain disabled 22bis auto-retrain enabledEnable Auto Fall Forward/Back Disable Auto Fall Forward/BackFax Class 1 Commands Voice Mode Commands S Registers Function Range/units Default Basic Response Codes Modem does not dial Modem does not respond to commandsModem dials but does not connect High pitch tone is heard whenever you answer the phone Modem makes a connection but no data appears on your screenModem exhibits poor voice record or playback FCC Compliance UartFCC Class B Statement DOC Compliance InformationDisclaimer, Copyright, And Other Notices Section One Introduction Software Installation/Configuration COM Port and Interrupt Settings Switch Block SW-1 Location Switch Block Settings Testing Your Modem After Installation Bold text Command Function Manually answer incoming call Ccitt modeOriginate calls in answer mode With AT or follow with EnterCommands are not echoed Resets modem after DTR toggle Recall factory default configurationToggle Hz guard toneMNP/V.42/V.42bis Commands \A3\Q3 Switch to reliable link from normal link Register Function Range/units Default S RegistersSection Five Result Codes Section Six Troubleshooting Modem does not dial Power 75 W Section Eight Support and Service DOC Compliance Information Disclaimer, Copyright, And Other Notices