User`s guide

2-8 Installing the PCLTA-20 Adapter
Installing the PCLTA-20 Adapter Before Software Installation
The following section applies to Windows 95/98 only.
If the PCLTA-20 adapter 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 adapter. When Windows 95/98 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 adapter as an
unknown device. As a result, the adapter 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 control panel and select the tab labeled “Device Manager.”
2. Double-click the “Other devices” icon.
3. Select “PCLTA-20” device and click the Remove button.
4. Install the PCLTA-20 software and reboot the PC.
System Resources
Each PCLTA-20 adapter 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 adapter used.
Solving IRQ and I/O Conflicts under Windows 95/98
I/O resource problems are rare under Windows 95/98 for the PCLTA-20 adapter since
the adapter 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 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 Device Manager does not locate a free IRQ for a newly
inserted PCLTA-20 adapter, it will not assign an IRQ to the adapter. 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 adapter’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
Control Panel window. The tab labeled “Device Manager” 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 adapter, there will
be a red circle with an exclamation point next to its icon.