ADLINK PCI-C588/PCIe-C588/C584 - Manual (Page 33)

Installation
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2.4 Hardware Configuration
The serial communication card has plug and play component, the card can
requests memory usage (I/O port locations) of the card which is assigned
by system BIOS. The address assignment is done on a board-by-board
basis for all serial communication cards in the system.
The jumper JP1 for the serial communication card is used for the system to
recognize the first or second card of the same model in the system if there
are two cards of the same on board.