Acces PCI-DIO-120 Digital Input/Output Card

The Acces PCI-DIO-120 is a digital input/output card for PCI bus systems, delivering up to 120 channels of configurable digital I/O. Built on FPGA technology that emulates 8255-compatible chips, It has flexible, software-controlled port configuration for industrial automation, data acquisition, and control applications. Each I/O line is buffered and individually manageable through tri-stateable outputs and jumper-configurable pull-up/pull-down resistors.

Technical Specifications

Digital I/O Channels

• Up to 120 channels of digital I/O (also available in 72-bit and 96-bit configurations)


• Three 8-bit ports (A, B, C) with independent input/output configuration


• Port C subdivides into two 4-bit nybbles via software Interface & Electrical


• PCI bus (Universal PCI, PCI-X compatible)


• 3.3V and 5V logic compatible


• Global jumper-selectable VCCIO: 5V, 3.3V, 2.5V, or 1.8V


• Output current: 32 mA sourcing or 64 mA sinking at 5V VCCIO


• 10 kΩ pull-up resistors to +5VDC (jumper-configurable to pull-down)


• Jumper-selectable pull-up/pull-down resistors per four- and eight-bit ports


• Interrupt generation capability from Port C bit 3 Power & Connectivity


• VCCIO and +5V supply available to user via 50-pin connectors


• 0.5A resettable fuse per 50-pin connector


• Physical length: 12.2 inches (310 mm) with 4.2 inches seated height

Key Features

• Buffered I/O lines with global tri-stateable control


• Flexible port configuration supporting input, output, or mixed modes


• Port C configurable as four inputs with four output latches


• Compatible with industry-standard I/O racks (Grayhill, Opto 22, Western Reserve Controls, Gordos, Potter & Brumfield)


• Windows auto-detection (95/98/NT and later)

Typical Applications Industrial automation, sensor interfacing, relay control, data acquisition systems, and device control requiring multi-channel digital I/O.

Compatibility & Integration Supported on DOS, Linux, macOS, Windows XP through Windows 10 (32-bit and 64-bit), Windows XPe, WES7, and vxWorks. Includes sample programs and source code in Visual Basic, Delphi, and Visual C++ for Windows. Linux support includes kernel driver installation files and user-level programming samples.