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


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.
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 source Logic Low: 0.55V (max) 24mA sink Power 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 = 4.5V Logic 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 latching mating: Molex 501189-4010 On-cable: Male, D-sub Miniature, 37-pin mating: Female, D-Sub Miniature, 37-pin |