2 - Installation
21
• Peripheral expansion cards, such as bus mouse and sound cards,
may 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 communications port. Be
sure to disable any unused ports.
To look for address or IRQ conflicts if you use Windows 3.1x, select
File
,
Run
in Program Manager, 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.
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.
• 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.
• 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).