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78 PI-SCX System Manual Version 2.E
78
Note: Changing the order of the PCI cards, that is, plugging them into different slots,
could change the address and interrupt assignments and possibly resolve the conflict.
However, this would be a trial and error process with no guarantee of success.
Diagnostics Software
Many diagnostics programs, both shareware and commercial, are available to help
resolve conflicts. Most often, all that's required is a program that will read and report the
address and interrupt assignments for each PCI device in the computer. One such
program available from Princeton Instruments' Customer Support department is called
PCICHECK. When the program is run, it reports the address and interrupt assignments
for the first PCI device it finds. Each time the spacebar is pressed, it moves on to the next
one and reports the address and interrupt assignments for that one as well. In a few
moments this information can be obtained for every PCI device in the computer. Note
that, even though there are generally only three PCI slots, the number of PCI devices
reported may be larger because some PCI devices may be built onto the motherboard. A
good strategy for using the program would be to run it before installing the PCI Serial
card. Then run it again after installing the card and note any address or interrupt
assignments that may have changed. This will allow you to easily focus on the ones that
may be in conflict with address or interrupt assignments on ISA cards. It might be noted
that there are many programs, such as the MSD program supplied by Microsoft, that are
designed to read and report address and interrupt assignments, including those on ISA
cards. Many users have had mixed results at best using these programs.
Operation
There are no operating considerations that are unique to the PCI Serial card. The card can
easily accept data as fast as any Princeton Instruments System now available can send it.
The incoming data is temporarily stored in the card’s memory, and then transferred to the
main computer memory when the card gains access to the bus. The PCI bus arbitration
scheme assures that, as long as every PCI card conforms to the PCI guidelines, the on-
board memory will never overflow.
Unfortunately, there are some PCI peripheral cards that do not fully conform to the PCI
guidelines and that take control of the bus for longer periods than the PCI specification
allows. Certain video cards (particularly those that use the S3 video chip) are notorious in
this respect. Usually you will be able to recognize when memory overflow occurs
because the displayed video will assume a split-screen appearance and/or the message
Hardware Conflict will be displayed (WinView/32). At the same time, the LED on the
upper edge of the PCI Serial card will light.
Users are thus advised not to take any actions that would worsen the possibility of
memory overflow occurring when taking data. In that regard, avoid multitasking while
taking data. Specific operations to avoid include multitasking (pressing ALT TAB or
ALT ESC to start another program), or running a screensaver program.