ACCES I/O M.2-DIO-24S 24 Digital I/O with CoS IRQ PCI Express M.2 Card


  •  M.2 Card 2260/2280 Size, with B&M Keys and latching I/O connectors
  • 24 High-Current DIO lines (24MA Source/Sink)
  • Change-of-state (COS) detection IRQ generation
  • 10K OHM Pull-up resistors
  • Four and Eight bit ports independently selectable for use as inputs or outputs
  • All signals brought out to optional panel-mountable 37-pin male DSUB connector
  • ROHS Standard
  • Available Industrial Temp (-40°C to +85°C) 

For further information, please click “Add to Enquiry” or call us on +44 (0) 1785 879050 (UK).



The ACCES I/O M.2-DIO-24S is a 2260/2280 size M.2 Card and optional cable assembly (D-Sub 37-pin Male connector) 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 also 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 card provides three 8-bit I/O ports designated A, B and C. Port C can be further divided into two 4-bit nybbles. Each port can be programmed as inputs or outputs. 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 interruption.

Ordering Info

M.2-DIO-24S 24 Digital I/O w/ CoS IRQ M.2 Card
M.2-DIO-24 24 Digital I/O M.2 Card


Assured Systems Datasheet (PDF)

A PDF edition of this page with supporting manufacturer datasheets

System Integration

Please ask about how we can configure your solution

Global Operations

We deliver and support products via offices globally

Full Warranty

Industry leading warranties on all solutions as standard

Technical Support

Experienced engineers are on hand to support your project

Can't Find What You Want?


M.2 Card 2260/2280 size with B & M keys
Digital Bits 24
Compatibility 8255 Mode 0
Digital Inputs Logic High: 2.0V to VCCIO (3.3VDC, 5VDC tolerant)Logic Low: 0V to 0.8V
Digital Outputs (Standard Version) Logic High: 2.0V (min) 24mA sourceLogic Low: 0.55V (max) 24mA sinkPower Output: +3.3 VDC via 0.5A polyfuse (resetting)
CMOS w/ user VCCIO 1.65V to 5.5V: At DB37M, via polyfuse
Digital Outputs(-TTL Option) Logic High: 3.8V(min) 32mA UVCCIO = 4.5VLogic Low: 0.55V (max) 32mA UVCCIO = 4.5V
Temperature Operating: 0° to 70°C (order “-T” for -40° to 85°C) Storage: -65° to 150°C
Humidity 5% to 95%, non-condensing
Power Required +3.3VDC @ 330mA (typical)
Weight 5.8 grams (+ 22.2g for the cable)
Size Length: 60mm/80mm Width: 22mm
I/O Connector On-Card: Molex 501190-4017 40-pin latchingmating: Molex 501189-4010On-cable: Male, D-sub Miniature, 37-pinmating: Female, D-Sub Miniature, 37-pin

Delivery Information

Orders placed by EMEA customers will be delivered by DHL.

Payment Methods & Options

Accepted payment options for EMEA customers include VISA, Mastercard or bank transfer in GBP.

Warranty & Service Information for ACCES I/O Products (EMEA)

All ACCES I/O products distributed in the EMEA come with a 2 year warranty as standard, with additional extension options available upon request. As an official ACCES I/O partner, we are proud to provide customers with peace of mind and the highest quality products, including any systems which have been configured to meet individual specifications.

Related Products

You may also like...


2-Port Isolated RS-232 PCIe Mini Card with Wide Operating Temperature


4 Isolated DIO with Change-of-State Mini-PCIe Module


mPCIe 4 Channel Isolated DI and Relay Output with Change-of-State


mPCIe 8 Channel Digital Input and Relay Output with Change-of-State