ACCES: Committed to Service

We're here to help!

Let our amazing support staff help you with questions: whether finding the right model for you, or technical support on using the product - or figuring out what's wrong - we have the expertise to help you. Use it!

Call, E-Mail, or Chat, Today!


  • Universal PCI, PCI-X, 3.3V and 5V compatible
    (PCI-Express versions available)
  • 48 bits of digital I/O
  • Interrupt generation on input change-of-state (“S” versions)
  • All I/O lines buffered on the card
  • I/O buffers can be enabled/disabled under program control
  • Four- and eight-bit ports independently selectable for I/O
  • Pull-ups on I/O lines
  • +5V supply available to the user
  • 68-pin SCSI type connector
  • No base address or IRQ switches to set
  • RoHS Available. Please contact us for ordering information
  • Support for Wind River VxWorks (call for ordering information)
Last updated on March 11, 2024, 2:56 pm


In Stock
SKU: N/A Categories: , Tags: ,


The PCI-DIO-48JP/JPS, and PCI-DIO-48JPL/JPLS are 48-bit parallel digital input/output cards designed for use in PCI-Bus computers. The card is 6.9 inches (175 mm) long and may be installed in any 5-volt PCI slot in IBM and compatible computers.

The 48JP/48JPS cards use a 68-pin SCSI-type connector which is pin-in-socket, and has jack-screws provided as a means to retain the mating cable.
The 48JPL/48JPLS cards use the 68-pin SCSI-type pin-in-socket connectors; however one-touch latches are used instead of jack screws.

For solutions which don’t require a 68 pin SCSI type connector, please consider our PCI-DIO-48S product family which uses 50-pin headers.

The cards contain two Programmable Peripheral Interface chips type 8255-5 (PPI) to provide computer interface to the 48 I/O lines. Each PPI provides three 8-bit ports A, B and C. Each 8-bit port can be software configured to function as either inputs or latched outputs. Port C can also be configured with four inputs and four output latches.

Each I/O line is buffered and capable of sourcing 15 mA or sinking 24 mA (64 mA on request). Tristate I/O line buffers are configured automatically by the hardware logic for input or output use according to a direction control signal from the control register in the PPI. Pull-ups on the card assure that there are no erroneous outputs at power up until the card is initialized by system software.

These cards use one address space, and occupy 16 consecutive register locations. When the card is first installed, Windows will detect it as new hardware and assign it an IRQ number and base address. There are no switches to set or base addresses to assign, making it easy to use. You cannot set or change the card’s base address, you can only determine what the system has assigned. The PCI Bus supports 64K of I/O address space so your card’s address may be located anywhere in the 0000 to FFFF range.


The distinguishing feature for the “48S” model is that the state of all inputs can be monitored and if one or more of the bits change states, a latched interrupt request can be generated. Therefore it is not necessary to use software polling on the inputs to detect a change of state condition. The change-of-state interrupt is enabled by a software write command to an interrupt-enable register. Once latched, the change-of-state interrupt can be cleared by a software write.

The C3 bit on either 24-bit port can be used as an external interrupt to the computer if interrupt enable (IEN) jumpers are installed. When C3 is level triggered, an interrupt is requested. Interrupts from the two ports are OR’ed together with any change-of-state interrupt. The interrupts are assigned by the system.


Available accessories include a wide variety of cables and screw terminal boards for quick and easy connectivity.





Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.


ACCES has successfully partnered with Wind River to bring our entire line of PCI and PCI Express DAQ cards to VxWorks 7!

VxWorks 7 VxBus Gen 2 drivers, with easy-to-use API-libraries, are available for this product, including full source and sample code.

Designed to be compatible with our AIOWDM.dll Windows driver & API, this kernel module adds zero% CPU-cycle overhead to your VxWorks runtimes while allowing the lowest-latency hardware register access possible.

You can find more information about our VxWorks libraries and services on our Wind River Silver Partner page.

Digital Inputs (TTL Compatible)

  • Logic High: 2.0 to 5.0 VDC
  • Logic Low: -0.5 to +0.8 VDC
  • Input Load (Hi): 20 uA
  • Input Load (Lo): -200 uA

Digital Outputs

  • Logic High: 2.0 VDC min., source 32 mA
  • Logic Low: 0.55 VDC max., sink 64 mA

Power Output

  • +5 VDC from computer bus (ext. 1A fast-blow fuse recommended)

Power Required

  • +5 VDC at 200 mA typical


  • 6.9″ (175 mm) long


  • Operating Temperature: 0o to 60o C
  • Storage Temperature: -50o to +120o C
  • Humidity: 0 to 90% RH, non-condensing

This product is in full compliance with CE requirements.

ModelDescriptionPrice (USD)

PCI 48 bit Digital I/O Card, 68-pin SCSI Type Connector, Jack Screws


PCI 48 bit Digital I/O Card, 68-pin SCSI Type Connector, Latching


PCI 48 bit Digital I/O Card, CoS IRQ, 68-pin SCSI Type Connector, Jack Screws


PCI 48 bit Digital I/O Card, CoS IRQ, 68-pin SCSI Type Connector, Latching

STB-68 DIN-rail mountable screw terminal board for 50 pin header type connector
C68PS18L 68-Pin SCSI round-wire shielded cable, 18″
C68PS36L 68-Pin SCSI round-wire shielded cable, 36″
Model Options:
-LV Factory option for 3.3V LVTTL signaling on digital connectors
-M Molex PC-style connector for maximum 5V VCCIO current sourcing capability
-RoHS RoHS compliant version
-T Extended temperature (-40°C to +85°C)