Multi-Tech Systems MT5600ZDX - Manual (Page 20)

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Model MT5600ZDX
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.
If you use Windows 95, 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 Communications 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 Request. If another device is using the same address range or IRQ,
it will appear 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 conflicting 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 documentation.
4 The serial port may be defective. If you have another serial port, install the
modem on it, change the COM port setting in your software, and try again.
4 The modem may be defective. If you have another Multi-Tech modem, try
swapping modems. If the problem goes away, the first modem is possibly
defective. Call Tech Support for assistance (see Chapter 5).
The Modem Dials But Cannot Make a Connection
There can be several reasons the MultiModemZDX fails to make a connection.
Possibilities include
• modem is not configured properly.
• 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. To
enable them, enter ATV1X4 and press ENTER while in terminal mode, or
include V1X4 in the modem’s initialization string. When you dial again, the
modem will report the call’s progress.
4 Both local and remote modems may be misconfigured, thus encumbering the
negotiation process between modems. The solution may be to modify modem
parameters via AT command strings. There are other configurations you can