• PCIe-DIO-24D Series
  • PCI Express Digital I/O Cards with Optional Counters and COS Detection
  • 24 high-current DIO lines
  • Three optional 82C54 Counter / Timers
  • IRQ generation from Port C bit 3, and Counter A2 ("C" models) and/or Change-of-State (COS) Detection ("S" models)
  • DIO lines buffered
  • Four and eight bit ports independently selectable for inputs or outputs
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  • Description
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  • This product is a x1 lane PCIe DIO board available in four models ranging from basic DIO to advanced COS detection and Counter/Timer capabilities. The card emulates an 8255 compatible chip, providing 24 DIO lines. The DIO lines are grouped into three 8-bit ports: A, B, and C. Each 8-bit port is configured via software to function as either inputs or outputs. Port C can be further broken into two 4-bit nybbles via software and configured as either inputs or outputs.

    Each DIO line is buffered and capable of up to 32mA source/sink. The VCCIO logic level is globally configured via jumper selection as 5V, 3.3V, 2.5V or 1.8V. Also, ports A, B, C low nybble, and C high nybble are individually software selected as pull-up or pull-down through 10kΩ resistor networks. The last configured pull-up/down state is stored in on-board non-volatile memory and automatically applied at the next power up. The board is shipped factory default as pulled-up.

    The card is 6.6 inches in length and 4.2 inches seated height. I/O wiring connections for this board are via a male 37-pin D-sub connector. A ribbon cable can be used to connect this card to termination panels.


    The PCIe-DIO-24D Series Features Include:
    • 24 high-current DIO lines
    • Three optional 82C54 Counter / Timers
    • IRQ generation from Port C bit 3, and Counter A2 ("C" models) and/or Change-of-State (COS) Detection ("S" models)
    • DIO lines buffered
    • Four and eight bit ports independently selectable for inputs or outputs
    • Software selectable 10k ohm Pull-up/Pulldown resistors on DIO lines
    • Jumper selectable VCCIO (5V, 3.3V, 2.5V,1.8V)
    • VCCIO voltage available to the user via 0.5A resettable fuse
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  • PCI Express Digital I/O Cards: The latest series of PCI Express Digital I/O cards from Acces I/O emulate the 8255 parallel I/O chip to provide 24 programmable Digital I/O lines. Options include a counter-timer and change-of-state detection...
  • Part Numbers
  • PCIe-DIO-24D
  • PCI Express 24 channel digital I/O card
  • PCIe-DIO-24DC
  • PCI Express 24 channel digital I/O card with counter/timers
  • PCIe-DIO-24DCS
  • PCI Express 24 channel digital I/O card with 82C54 counter/timers and change of state detection
  • PCIe-DIO-24DS
  • PCI Express 24 channel digital I/O card with change of state detection