Rockwell Automation 1784-PKTX_PKTXD Communication Card User Manual - Manual (Page 11)

Publication 1784-UM527B-EN-P - October 2003
Chapter
2
Configuring the PKTx Hardware
Introduction
The 1784-PKTx card is a PCI bus card, compliant with the PCI Bus Specification Revision
2.3. This card was developed with Plug and Play functionality, as defined in Revision 1.0A of
the Plug and Play BIOS Specification. Because of this, PKTx cards do not require the use of
switches or jumpers to configure their specific interrupt request levels (IRQ) and base
memory address values. These configurations are automatically assigned to the PKTx card by
the PCI BIOS when the computer is powered-up. The configurations are stored in the PCI
configuration registers. These values may be retrieved by application software used to
communicate with the PKTx card.
Interrupt Request Assignment
The PCI BIOS automatically assigns the PKTx card an IRQ. Because of this, each time you
add or remove cards and restart your computer, the BIOS may assign a different IRQ to each
card. You should check the IRQ assignment each time you start your system. Most
application software will verify this assignment for you. If you’re using RSLinx, its Plug and
Play driver verifies the IRQ.
Base Memory Address Values
Although the assignment of the IRQ and base memory address values is automatic, and does
not require user intervention, there is one jumper on the PKTx card that is used to restrict the
range of values that can be assigned to the base memory address by the PCI BIOS. This
jumper is called the Base Memory Address jumper, and its default position is set to 32 bit.
If you are not using Microsoft Windows 95 or later, you may have to set this jumper. See
Figure 2.1 on page 2-2.