Multi-Tech Systems MT5600BL User Manual download pdf (Page 86)

MultiModemII User Guide

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.

Windows 9x: Right-click on My Computer, select Properties from the menu,

click on the Device Manager tab, double-click on Ports, then double-click on the

communication port your modem is connected to. In the port’s Properties sheet,

click on the Resources tab to see the port’s input/output range and interrupt re-

quest. If another device is using the same address range or IRQ, it appears in the

Conflicting Device List. Uncheck Use automatic settings to change the port’s

settings so they do not conflict with the other device, or select the port the con-

flicting device is on and change it instead. If you need to open your computer to

change switches or jumpers on the conflicting device; refer to the device’s docu-

mentation.

Windows NT 4.0: To look for address or IRQ conflicts, click Start, Programs, Ad-

ministrative Tools (Common), and Windows NT Diagnostics. In the Windows

NT Diagnostics dialog box, click the Resources tab to see which input/output

ranges and interrupt requests are in use. If you need to open your computer to

change switches or jumpers on the conflicting device; refer to the device’s docu-

mentation.

The serial port might be defective. If you have another serial port, install the mo-

dem on it, change the COM port setting in your software, and try again.

The modem might be defective. If you have another Multi-Tech modem, try

swapping modems. If the problem goes away, the first modem is possibly defec-

tive. Call Technical Support for assistance (see Appendix D).

The Modem Dials But Cannot Connect

There can be several reasons the modem fails to make a connection. Possibilities include:

• lack of a physical connection to the telephone line.

• a wrong dial tone.

• a busy signal.

• a wrong number.

• no modem at the other end.

• a faulty modem, computer, or software at the other end.

• incompatibility between modems.

You can narrow the list of possibilities by using extended result codes. Extended re-

sult codes are enabled by default. If they have been disabled, include V1X4 in the

modem’s initialization string, or in terminal mode enter ATV1X4 and press ENTER.

When you dial again, the modem reports the call’s progress.

If the modem reports NO DIALTONE, check that the modem’s telephone line ca-

ble is connected to both the modem’s LINE jack (not the PHONE jack) and the

telephone wall jack. If the cable looks secure, try replacing it. If that doesn’t

work, the problem might be in your building’s telephone installation. To test the

building installation, plug a telephone into your modem’s telephone wall jack

and listen for a dial tone. If you hear a dial tone, your modem might be installed

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Multi-Tech Systems MT5600BL User Manual Page 86

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