85
✔
Your communication software settings may not match the physical port the
modem is connected to. The serial cable might be plugged into the wrong
connector—check your computer documentation to make sure. Or you might
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
communication software is configured correctly, and you still don’t get an OK,
the fault might 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 wired
correctly. Check the cable description on the packaging to make sure the cable
is the right one for your computer.
✔
Peripheral expansion cards, such as sound and game cards, might 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 communication port. Be sure to disable any unused ports.
For 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 request. 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 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.
For Windows NT 4.0: To look for address or IRQ conflicts, click Start,
Programs
, Administrative 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 documentation.
✔
The serial port might 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 might have a problem beyond the scope of this user guide. If you
have another BLACK BOX
®
modem, try swapping modems. If the problem
goes away, call Tech Support for assistance.
CHAPTER 9: Troubleshooting
