Echelon PCLTA-20, Руководство пользователя, Страница: 19 / 39

2-8 Installing the PCLTA-20 Card
Installing the PCLTA-20 Card Before Software Installation
The following section applies to Windows 95/98/Me only.
If the PCLTA-20 card was inserted into the PC prior to PCLTA-20 software installation,
the Windows operating system will be unable to associate a device driver with the card.
When Windows 95/98/Me starts up, a New Hardware Found window will appear. Click
the Cancel button, then install the PCLTA-20 software as described above.
If the option “Do not install a driver (Windows will not prompt you again)” was
inadvertently selected, the operating system will mark the PCLTA-20 card as an
unknown device. As a result, the card will not function even if the PCLTA-20 software
is installed. To correct this problem, remove the device using the following steps:
1. Open the System icon in the Windows Control Panel and select the Device Manager
tab.
2. Double-click the Other Devices icon.
3. Select the PCLTA-20 device and click the Remove button.
4. Install the PCLTA-20 software and reboot the PC.
System Resources
Each PCLTA-20 card requires sixteen contiguous bytes of I/O address space starting on
a modulo-4 based address, i.e., an address evenly divisible by 4. A dedicated interrupt
request (IRQ) is also required for each PCLTA-20 card used.
Solving IRQ and I/O Conflicts under Windows 95/98/Me
I/O resource problems are rare under Windows 95/98/Me for the PCLTA-20 card since
the card can handle a wide range of I/O settings. However, IRQ resource problems may
occur more often in multimedia computers which may have very few spare IRQs. The
Windows 95/98/Me operating system handles most allocations of IRQs, but there are
some instances where the operating system cannot properly allocate interrupt requests.
When the Windows 95/98/Me Device Manager does not locate a free IRQ for a newly
inserted PCLTA-20 card, it will not assign an IRQ to the card. As a result, there may
be no indication to the user that a problem has occurred, since no true resource conflict
has occurred. This is a consequence of the PCLTA-20 card’s ability to be assigned any
of the system’s 16 IRQs.
IRQ usage in the system can be determined by opening the System icon in the Windows
Control Panel. The Device Manager tab allows viewing of devices by type or connection.
The PCLTA-20 L
ON
W
ORKS
Network Interface device icon is found under the
LonWorks Interface device type . If there is a problem with the card, there will be a red
circle with an exclamation point next to its icon.
IRQ resource problems may generally be resolved by disabling another device in the
system. More information can be found in the Hardware Conflict troubleshooting
portion of the Windows 95/98/Me on-line Help file.