PCI-IDI Series: 16, 32, or 48 Channel Isolated Digital Input Cards

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  • 16, 32, or 48 individually optically isolated AC/DC inputs
  • Change-of-state detection (IRQ) on selected inputs (certain models)
  • Polarity insensitive AC/DC inputs accept up to 60VDC or AC rms
  • Optically isolated channel to channel and channel to ground
  • Universal PCI, PCI-X, 3.3V and 5V compatible
  • AC or voltage transient filtering
  • Universal PCI, PCi-X, 3.3V and 5V compatible (Call for PCI-Express availability)

Factory Options

  • RoHS Available.
  • Support for Wind River VxWorks
Last updated on November 10, 2023, 5:32 pm


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16, 32, or 48 Channel Isolated Digital Input Cards

PCI-IDI-xx Series cards offer a range of 16, 32, or 48 individual, optically isolated inputs. These cards are ideal for use in control and instrumentation applications where high-voltage protection is required. Individual channel-to-channel isolation allows every channel to be physically and electrically separated from the others.

Inputs feature a change-of-state detection capability (denoted by a ‘C’ after the model number) which provides a means to automatically interrupt the host computer in real time. When one or more input bits change state, a PCI interrupt is generated to automatically wake up your application. This can greatly simplify your application program and eliminate need to continuously poll inputs.

Each input is rectified by photo-coupler diodes, therefore polarity insensitive – either positive, negative, and AC voltage inputs are acceptable. The input range is up to 60VDC or AC rms at frequencies of 40 to 10 kHz.

These cards are especially useful in applications where high common-mode external voltages are present. Isolation is required to guard electronics from transient voltage spikes and offers greater common-mode noise rejection in electronically noisy surroundings containing industrial machinery and inductive loads. These applications include factory automation, energy management, industrial ON/OFF control, security systems, manufacturing test, and process monitoring. In addition to protecting industrial applications from accidental contact with high external voltages, the isolation provided eliminates troublesome ground loops. Connections are available via 50-pin IDC type headers, ribbon cables, and a variety of screw terminal boards.

MODEL # of Bits Max Input Voltage COS Interrupt Capability AC Filter
16A 16 31V No Yes
16AC 16 31V Yes Yes
32A 32 31V No Yes
32AC 32 31V Yes Yes
48A 48 31V No Yes
48AC 48 31V Yes Yes
16B 16 60V No Yes
16BC 16 60V Yes Yes
32B 32 60V No Yes
32BC 32 60V Yes Yes
48B 48 60V No Yes
48BC 48 60V Yes Yes


These cards are supported for use in most operating systems and include a free DOS, Linux (including Mac OS X) and Windows XP -> 10, both 32 & 64 bit compatible software package. This package contains sample programs and source code in ‘C’ for DOS, and Visual Basic, Delphi, and Visual C++ for Windows. Also incorporated is a graphical setup program in 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 DLL interface usable from the most popular application programs, and includes example LabVIEW VIs. Embedded OS support includes Windows Xpe, WES7, etc.




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 Serial Communication cards to VxWorks 7! All ACCES plug-and-play serial cards are now supported with our VxWorks driver, including RS232, RS422, RS485 (2- and 4-wire) and baud rates up to 10Mbps.

Designed as an update to the existing vxbPciNs16550Sio.c driver, we’ve added support for ×8 baud rates, proper handling of the unique register location of the 4th port in the Pericom PI7C9X7954 UART, and configuring the serial protocol from your application software.

With this driver suite all ACCES PCI, PCI Express, PCI Express Mini Card, M.2, PCI-104, PCIe/104, and all related “PCI Style” plug-and-play serial cards will detect and install as standard VxWorks SIO ports.

Digital Isolated Inputs

  • Number of inputs: 16, 32, or 48
  • Type: Non-polarized, optically isolated from each other and from the computer (CMOS compatible)
  • Voltage Range:
    • xxA Logic Low: 0 to 2VDC or AC RMS (40Hz to 10KHz)
    • Logic High: 3 to 31VDC or AC RMS (40Hz to 10KHz)
    • xxB Logic Low: 0 to 5VDC or AC RMS (40Hz to 10kHz)
    • Logic High: 11 to 60VDC or AC RMS (40Hz to 10kHz)
  • Isolation: Optically Isolated channel-to-ground or channel-to channel (*see note)
  • Input Resistance:
    • xxA 1.8K ohms in series with optocoupler
    • xxB 15K ohms in series with octocoupler
  • Non-Filter Response Times: Rise Time = 10 uS / Fall Time = 30 uS
  • Filter Time Constant: 4.7mS
  • Power Required: +5VDC @ 300mA typical

*Note on Isolation:
Opto-Isolators and connectors are rated for at least 500V, but isolation voltage breakdowns will vary and is affected by factors like cabling, spacing of pins, spacing between traces on the PCB, humidity, dust and other environmental factors. This is a safety issue so a careful approach is required. For CE certification, isolation was specified at 60VDC or AC rms. The design intention was to eliminate the influence of common mode. Use proper wiring techniques to minimize voltage between channels and to ground. Tolerance of higher isolation voltage can be obtained on request by applying a conformal coating to the board.


  • Operating Temperature: 0°C to +70°C
  • Storage Temperature: -55°C to +150°C
  • Humidity: 0% to 95% RH, without condensation
  • Board Dimension: 6.875″ (174.6mm) long

Regulatory Compliance

  • This product is in full compliance with CE requirements.
ModelDescriptionPrice (USD)

48 Channel, 60V Max, Isolated Digital Input w/COS IRQ PCI Card


48 Channel, 60V Max, Isolated Digital Input PCI Card


48 Channel, 31V Max, Isolated Digital Input w/COS IRQ PCI Card


48 Channel, 31V Max, Isolated Digital Input PCI Card


32 Channel, 60V Max, Isolated Digital Input w/COS IRQ PCI Card


32 Channel, 60V Max, Isolated Digital Input PCI Card


32 Channel, 31V Max, Isolated Digital Input w/COS IRQ PCI Card


32 Channel, 31V Max, Isolated Digital Input PCI Card


16 Channel, 60V Max, Isolated Digital Input w/COS IRQ PCI Card


16 Channel, 60V Max, Isolated Digital Input PCI Card


16 Channel, 31V Max, Isolated Digital Input w/COS IRQ PCI Card


16 Channel, 31V Max, Isolated Digital Input PCI Card

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