Kontron PCI-COM422, User Manual

Page: 24 / 36

page 24 PCI-COM422 User’s Guide
Address Selection
The card uses one address space. COM A, COM B, COM C, COM D, COM E, COM F,
COM G and COM H each occupy eight consecutive register locations. The interrupt
register which indicates which port or ports caused the interrupt is located at base
a 64 (0x40 hex).
PCI architecture is Plug-and-Play. This means that the BIOS or Operating System
determines the resources assigned to PCI cards rather than you selecting those
resources with switches or jumpers. As a result, you cannot set or change the card's
base address. You can only determine what the system has assigned.
To determine the base address that has been assigned, run the PCIFind.EXE utility
program provided. This utility will display a list of all of the cards detected on the PCI
bus, the addresses assigned to each function on each of the cards, and the respective
IRQs (if any) allotted.
Alternatively, some operating systems (Windows 95/98/2000/XP) can be queried to
determine which resources were assigned. In these operating systems, you can use the
Device Manager utility from the System Applet of the control panel. The card is installed
in the Data Acquisition class of the Device Manager list. Selecting the card, clicking
Properties, and then selecting the Resources Tab will display a list of the resources
allocated to the card.
The PCI bus supports 64K of I/O space. Your card's addresses may be located
anywhere in the 0000 to FFFF hex range.
PCIFind uses the Vendor ID and Device ID to search for your card, then reads the base
address and IRQ.
If you want to determine the base address and IRQ yourself, use the following
information.
Vendor ID code is 494F (ASCII for "I/O")
Device ID code is 1068