104-IDIO-16 Isolated DIO Board

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  • 16 or 8 optically-isolated, non-polarized CMOS compatible digital inputs accept ±31VDC or AC rms
  • IRQ on input change of state (COS) eliminates the need for constant polling
  • Slow/fast filter to accommodate AC voltages and noisy DC inputs
  • 16 or 8 optically-isolated fully protected high-current sourcing solid state outputs

Factory Options: (call for pricing and availability)

  • 0 to 70°C and -40 to +85°C versions available
  • Economy version without COS feature
  • Input only and output only versions
  • Expanded input voltage levels
  • RoHS Available. Please contact us for ordering information
Last updated on April 13, 2024, 4:59 pm


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PC/104 card with 16 optically isolated inputs and 16 optically isolated solid state outputs.

The Model 104-IDIO-16 is a 32-channel PC/104 utility board featuring 16 optically isolated inputs and 16 optically isolated solid state outputs. The isolated, non polarized inputs may be driven by either DC sources of 3-31V (or higher by special order) or AC sources at frequencies of 40Hz to 10KHz. Optically isolating the digital inputs from each other, and from the computer, assures smooth, error-free data transmission in noisy, real-world environments. The 16 input channels are available via a 34-pin IDC type header. The fully protected solid state outputs, capable of sourcing 2A each, are inherently more reliable than electromechanical relays and give system architects a more robust product to design with. The solid state outputs are available via a 50 pin IDC type header.

Each input circuit includes a jumper selectable slow/fast filter to accommodate AC inputs and is also useful for slow DC inputs in noisy environments. The filter may be manually disabled to increase the boards typical response time to 10 µsec when used with faster DC inputs. The input impedance is 1.8K Ohms to accommodate a wide input range.

The board is installed by jumper selecting base addresses and IRQ. System interrupts are software controlled, enabling the board to generate an interrupt whenever one or more of the isolated digital inputs changes state. This eliminates the need for constant polling and greatly frees up system resources. Model 104-IDIO-16E is an economy version available without the interrupt Change of State Detection feature.

The 104-IDIO-16 is designed for use in both commercial and optionally in industrial environments of 0 to +70°C and -40 to +85°C, respectively.

Models 104-IDIO-8 and 104-IDIO-8E feature 8 optically isolated inputs and 8 optically isolated solid state outputs. Also available is Model 104-IDO-16 which has 16 outputs only, Model 104-II-16 which has 16 input only, and 104-IDO-8 which is the 8 outputs only version.

The 104-IDIO-16 series is supported by most operating systems and include a free DOS, Linux and XP/2003/2008/7/8/8.1 compatible software package. This includes sample programs and source code in “C” and Pascal for DOS, and Visual Basic, Delphi, and Visual C++ for Windows.


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.

Isolated Digital Inputs

  • Number of inputs: Sixteen
  • Type: Non-polarized, optically isolated from each other and from the computer. (CMOS compatible)
  • Voltage Range: 3 to 31 DC or AC (40 to 10000 Hz)
  • Isolation: 500V*(see manual) channel-to-ground or channel-to channel
  • Input Resistance: 1.8K Ohms in series with opto coupler
  • Response Time: 4.7 mSec w/filter, 10 µSec w/o filter (typical)
  • Interrupts: Software controlled with jumper IRQ selection (models 104-IDIO-16 and 104-IDIO-8)

Isolated Digital Outputs

  • Number of outputs: Sixteen Solid State FETs (off @ power up).
  • Output Type: High Side Power MOS FET Switch.
  • Protection Features: Protected against short circuit, over-temperature, ESD, can drive inductive loads.
  • Voltage Range: 5-34VDC recommended (user supplied) for continuous use, 40VDC absolute max.
  • Current Rating: 2A maximum.
  • Turn-on time: 90usec
  • Turn-off time: 110usec


  • Interrupts: Software controlled with jumper IRQ selection (models 104-IDIO-16 and 104-IDIO-8)

Power Required

  • +5VDC @ 0.150A (all FETs ON)


  • Operating Temp: 0° to +70°C, (-40 to +85°C Optional)
  • Storage Temp: -40 to +85°C

CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.

ModelDescriptionPrice (USD)

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PC/104, 8 ISO In, 8 Solid State Relay Out, Change of State Detect


PC/104, 8 ISO In, 8 Solid State Relay Out

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