PCIe-IDIO-24 Isolated Digital I/O Card Family

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  • 24 optically isolated, non-polarized digital inputs
  • Software configurable filters on inputs for electrically noisy environments
  • Can detect input state change and assert interrupt
  • 24 optically isolated high-side FET switches
  • Opto-couplers rated for 2.5kV isolation
  • Four optically isolated output groups and two optically isolated input groups
  • 8 non-isolated TTL/CMOS I/O lines
  • Designed, made, supported, and manufactured in the USA

Factory Options

  • Extended temperature operation (-40°C to +85°C)
  • 12-channel version (with 4 TTL I/O) available
  • Input only and output only versions available
  • RoHS compliant version
  • Support for Wind River VxWorks (call for ordering information)
Last updated on November 2, 2023, 6:24 pm


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Data Sheets



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.

Block Diagram

Isolated Digital Inputs

  • Number of inputs: 24
  • Type: Non-polarized, optically isolated sharing a common return per 12 channel group (not TTL/CMOS compatible)
  • Voltage Range: 3 to 31V DC or 22 VACrms (40-10kHz)
  • Isolation: Opto-couplers rated at 2.5kV (see manual)
  • Input Resistance: 1.8k ohms in series with two diodes and a photo-coupler LED
  • Response Time:
    with filter: 4.7 mSec
    without filter:
    rise time = 10 uSec
    fall time = 30 uSec
  • Interrupts: Change of State Detection available on all 32 input bits; software enabled in 8 bit groups; byte-wide pattern recognition

Solid State FET Outputs

  • Number of outputs: 24, Isolated in four, 6-channel groups
  • Output Type:
    Smart High Side Power MOSFET,
    Fully Protected (short circuit, over-temp., ESD, inductive flyback)
  • Voltage Range:
    5-34VDC recommended
    (40VDC absolute maximum)
  • FET Ratings:
    On-state resistance = 60mΩ
    2A continuous per FET,
    9A cumulative total per group of 6 FETs
    Turn-on time:   90uS (typical)
    Turn-off time: 110uS (typical)

Non Isolated Digital Inputs/Outputs

  • Number of lines: 8, programmable as all ins or all outs
  • Type: TTL/CMOS compatible, pulled up to 5V via 10k ohms


  • Operating Temperature: Commercial 0°C to 70°C, Industrial -40°C to +85°C
  • Storage Temperature: -40°C to +85°C
  • Humidity: 5% to 95%, (non-condensing)
  • Card Dimensions: Standard Height 4.2″ (106.65 mm), half length 6.6″ (167.6 mm) long
  • Connector: DB78 Female Mating Connector: AMPLIMITE 1658674-1 or equivalent


  • Call

Regulatory Compliance

This product is designed to be in full compliance with CE requirements.

ModelDescriptionPrice (USD)

PCIe, 24 Isolated Inputs, 24 FET Ouputs


PCIe, 12 Isolated Inputs, 12 FET Ouputs


PCIe, 24 Isolated Inputs


PCIe, 24 FET Ouputs

For the PCIe-IDIO-24, PCIe-IDI-24, and PCIe-IDO-24
STB-37/2 KIT Screw terminal and cabling solution includes two STB-37 screw terminal cards, Y Cable, and a 1′ SNAPTRACK $159
STB-37/2 KIT-CL As above except includes four clips for mounting the STB-37/2 Kit to a standard DIN-Rail $178
CAB78-37/2 6′ round-wire “Y” cable which connects to the DB-78 connector and terminates to two DB-37 female connectors $80
DIN-SNAP 1′ SNAPTRACK with four clips, for mounting two STB-XX screw terminal boards on a DIN rail $20
SNAPTRACK 1′ SNAPTRACK mounting rail for two STB-XX products $10
STB-37 DIN-rail mountable screw terminal board for use with any ACCES card that has a 37 pin mating connector $39
For the PCIe-IDIO-12
STB-37/1 KIT Screw terminal and cabling solution includes one STB-37 screw terminal card, Cable, and 1′ SNAPTRACK $95
STB-37/1 KIT-CL As above except includes two clips for mounting the STB-37/1 Kit to a standard DIN-Rail $114
CAB78-37/1 6′ round-wire cable which connects to the DB-78 connector and terminates to a single DB-37 female connector $50
DIN-SNAP-6 6″ SNAPTRACK with two clips, for mounting one STB-XX screw terminal board on a DIN rail $15
SNAPTRACK-6 6″ SNAPTRACK mounting rail for one STB-XX product $6
STB-37 DIN-rail mountable screw terminal board for use with any ACCES card that has a 37 pin mating connector $39
Model Options:
-T Extended temperature (-40°C to +85°C)
-RoHS RoHS compliant version