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mPCIe-II-16, mPCIe-II-8, and mPCIe-II-4

16, 8 or 4 Isolated Digital Inputs with Change-of-State (COS) PCI Express Mini Card



  • PCI Express Mini Card (mPCIe) Type F1, with latching I/O connectors
  • 16, 8 or 4 optically isolated, non-polarized inputs up to 31VDC/AC
  • Change-of-State (COS) detection IRQ generation
  • Panel-mountable isolation module with 37-pin male D-Sub connector
  • 4 LVTTL I/O lines programmable as inputs or outputs in groups of 2 lines
  • 9” cable (228MM), standard, connects isolation module to mPCIe-DIO card
  • RoHS standard
  • Now with Digital Integration Features!
    • Outputs with pulse/train / PWM / frequency / and Quadrature generation, Inputs with digital filtering and flexible measurement of pulse duration, frequency, and event counting, IRQ generation and more.


Industrial operating temperature (-40°C to 85°C)

The mPCIe-II-16 consists of a type F1 PCI Express Mini Card (mPCIe) interface board that connects to a Mobile-ITX-sized, DB-37M Isolation Module via an included 9” cable. That module is designed to be easily panel-mounted in any application environment. 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 allows for simple and trouble-free migration from other ACCES PCI and PCI Express digital I/O cards, but also provides for advanced features enabled by the onboard FPGA logic.

The mPCIe-II family of cards are well suited to complex environments, mitigating otherwise challenging ground-loops, high-common-mode, and transient voltage spikes common in electrically-noisy industrial or factory locations. Individual channel-to-channel isolation allows every channel to be physically and electrically separated from the others. The broad voltage compatibility allows use in a wide range of applications.

The non-polarized inputs support both AC and DC, and configuration jumpers allow 4.7ms input filters to be enabled per-channel, as desired – required for AC use. The Isolated Inputs support voltages from 3 to 31 VDC/VAC RMS [40Hz to 10000Hz], as well as standard 12/24 AC control transformer signals.

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 determines which bit changed state and clears the interrupt.

Rounding out the utility of this solution are the 4 LVTTL general purpose I/O lines, programmable as inputs or outputs in groups of 2 lines. These lines are pulled up to VCCIO via 10k ohm resistors, useful for monitoring dry contacts that don’t need isolation.


Digital∫Features (read as "Digital Integration Features") are a new family of features available for applicable models of ACCES' PCI Express (PCIe) and PCI Express Mini Card (mPCIe) Digital I/O product lines.

All the cards share features such as memory mapped registers for low-latency operation. Output channels support pulse/train / PWM / frequency / and quadrature generation. Inputs channels support flexible measurement of pulse duration, frequency, and event counting, with optional debouncing, IRQ generation, and more.


The mPCIe-II-16 is excellent for use in a variety of applications where high-voltage protection is required such as:

  • Factory Automation
  • Industrial ON/OFF control
  • Security Systems, Energy Management
  • Process Monitoring
  • Manufacturing/Production Test
  • Machine Control
  • Monitoring and Control
  • Industrial Automation
  • Embedded OEM

Special Order

Please contact us with your precise requirement. Examples of special orders would be conformal coating, custom software or product labeling, and more. We will work with you to provide exactly what is required.

Accessories and Connections

Available accessories include a variety of screw terminal boards for quick and easy connectivity as well as 2mm and 2.5mm mounting hardware. Alternately, custom hardware cables and/or interfaces can be produced to fit your specific application requirement.


The card is supported for use in most operating systems and includes a free DOS, Linux , and Windows 2000/XP/2003/Vista/7/8/10 compatible software package. This package contains sample programs and source code in Visual Basic, Delphi, and Visual C for Windows. Also provided 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 LabVIEW 8.5 VIs. Embedded OS support includes Windows XPe, WES7, WES8, etc. Full register-level documentation of all features ensures easy compatibility in any application environment.


PC Interface

  • PCI Express Mini Card: Type F1 "Full Length" V1.2

Isolated Inputs

  • Number: 16, 8 or 4
  • Type: Non-polarized, optically isolated from each other and from the computer (CMOS compatible)
  • Voltage: 3 to 31 DC or AC RMS (40 to 10000Hz)
  • Isolation: 500V channel-to-ground and channel-to-channel
  • Resistance: 1.8KΩ in series with opto-coupler
  • Filter Response
    • Rise-time: 4.7 ms
    • Fall-time: 4.7 ms
  • Non-Filter Response
    • Rise-time: 10 μs
    • Fall-time: 30 μs

Digital I/O Lines

  • Number: 4
  • Type: High Side Power MOSFET Switch. Protected against short-circuit, over-temp, ESD; drives inductive loads.
  • Voltage Range: 5-34VDC recommended (customer supplied) for continuous use, 40VDC absolute maximum
  • Current Rating 2A maximum
  • Turn On time: 90μsec
  • Turn Off time: 110μsec
  • Digital Inputs (4 or 2 LVTTL)
    • Logic High: 2.0V to VCCIO (3.3VDC, 5VDC tolerant)
    • Logic Low 0V to 0.8V
  • Digital Outputs (4 or 2 LVTTL)
    • Logic High: 2.0V (min) 24mA source
    • Logic Low: 0.55V (max) 24mA sink


  • Temperature
    • Operating: 0°C to 70°C (order -T option for industrial temperature -40°C to 85°C)
    • Storage: -65°C to 150°C
  • Humidity: 5% to 95%, non-condensing
  • Power required: 3.3VDC @ 360ma (typical)


  • mPCIe card characteristics
    • Weight: 6.2 grams
    • Size
      • Length: 50.95mm (2.006″)
      • Width: 30.00mm (1.181″)
    • I/O connector
      • On-card: Molex 501190-4017 40-pin latching
      • Mating: Molex 501189-4010
  • Isolation board characteristics
    • Weight: 38.2 grams, ( 11.2 grams for the 9" cable)
    • Size (Mobile-ITX sized)
      • Length: (2.952″)
      • Width: (1.1.772″)
    • I/O connector
      • On board: Male, D-Sub Miniature, 37-pin
      • Mating: Female, D-Sub Miniature, 37-pin

Regulatory Compliance

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


Drivers and Downloads

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

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.



Available Reference Manuals

  • View / Download the mPCIe-II-16 Family Manual (.pdf)

Available Software Downloads

  • mPCIe-II-16 Software Package

Available Datasheets

  • View / Download the mPCIe-II-16 Family Data Sheet (.pdf)

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.

Please call us to order



16 Isolated Digital Inputs and 4 LVTTL I/Os mPCIe Card


8 Isolated Digital Inputs and 4 LVTTL I/Os mPCIe Card


4 Isolated Digital Inputs and 4 LVTTL I/Os mPCIe Card



2mm mounting hardware $1


2.5mm mounting hardware $1


Direct connect screw terminal adaptor for use with 37-pin male connector $40


DIN-rail mountable screw terminal board for 37-pin connector $39


37-pin screw terminal board $29


Ribbon cable, female 37-pin connectors on each end, 18" $25


Ribbon cable, female 37-pin connectors on each end, 36" $29


Ribbon cable, male to female 37-pin connectors, 36" $29


Ribbon cable, male to female 37-pin connectors, 18" $29

Model Options (call for pricing)


Extended temperature operation (-40° to 85°C)

USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1280
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027