Access PCI-COM422/4 user manual Address Selection

Chapter 4: Address Selection

The PCI-COM422/4 card uses four separate address spaces. COM A occupies 16 consecutive register locations and COM B, COM C, and COM D each occupy eight consecutive register locations.

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 provided. This utility will display a list of all of the ACCES 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 (Windows95/98/2000) can be queried to determine which resources were assigned. In these operating systems, you can use either PCIFind (Windows95) or PCINT (WindowsNT), or the Device Manager utility from the System Properties Applet of the control panel. The PCI-COM422/4 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.

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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.

The Vendor ID for this card is 494F. (ASCII for "IO")

The Device ID for the PCI-COM422/4 is 1058h.

The PCI Bus supports 64K of I/O space, so your card's addresses may be located anywhere in the 0000 to FFFF hex range

Manual MPCICOM422-4.E1b Page 4-1