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PCI Express 48-Ch Digital I/O Card w/ screwlocks

Acces I/O



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Product Datasheet

This product is RoHS-compliant

Please contact us if you require a non-RoHS version.

Please note, Acces I/O products are often available in an array of different options, of which only a selection will be displayed here. Please contact us for pricing if you require a product option that is not shown on our website.

The PCIe-DIO-48JPS is a 48 channel PCI Express (PCIe) card designed for use in a variety of digital I/O applications. It uses the high speed PCI Express bus to transfer digital data to and from the card. The digital I/O is compatible with 8255 PPI chips making it easy to program. This also allows for simple and trouble-free migration from other ACCES PCI digital I/O cards . The card features a x1 lane PCI Express connector which can be used in any available x1, x2, x4, x8, x12, or x16 PCI Express expansion slot. The card is 6.6 inches in length and 4.2 inches seated height.

Two 24 line groups each have three 8-bit I/O ports designated A, B and C. Port C can be further divided into two 4-bit nybbles. Each port can be programmed as inputs or outputs. Change of State (COS) detection and interrupt capabilities are designed to relieve software from polling routines that can consume valuable processing time. Each port can be programmed for detecting state changes on their lines, in which any changes of the enabled port's bits (low-to-high or high-to-low) will generate an IRQ. An ISR (interrupt service routine) then polls the port to determine which bit changed state and clear the interrupt.

This card is an excellent choice for system designs that would benefit from using a wiring harness to connect up to a complete system. This is due to the 68-pin I/O connector being located on the card mounting bracket, it is a much cleaner card solution to use compared to routing ribbon cables through a cutout on the card mounting bracket, then plugging them onto the headers on the side of the card.


Available accessories include ribbon cables and shielded round-wire molded cable assemblies. Screw terminal boards and DIN-rail mounts are also available for a variety of quick and easy connectivity options.


The card is supported for use in most operating systems and includes Linux and Windows compatible software packages. This package contains sample programs and source code in Delphi and Visual C++ for Windows. Linux support includes installation files and basic samples for programming from user level via an open source kernel driver. Third party support includes a Windows standard


  • 48 channel high-current TTL digital I/O lines
  • Change of State (COS) detection and interrupt capabilities
  • Compatible with industry standard 8255 PPI
  • 68-pin SCSI pin-in-socket female connector on card mounting bracket
  • User interrupt pin
  • All 48 digital I/O lines buffered with 32mA source / 64mA sink current capabilities
  • Four and eight bit ports independently selectable for inputs or outputs
  • Jumper configurable pull-up/-down on DIO lines
  • 5V VCCIO (3.3V jumper configurable)
  • Fused VCCIO available on I/O connector