ACCES I/O M.2-II-16 16 Isolated Digital Inputs with Change-Of-State M.2 Card


  • 2260/2280 sized M.2 Card with B & M keys and latching I/O connectors
  • 16 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 M.2-DIO card
  • RoHS standard


The ACCES I/O M.2-II-16 consists of a 2260/2280 sized M.2 Card 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 M.2-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.

Ordering Info

M.2-II-16 16 Isolated Inputs
M.2-II-8 8 Isolated Inputs
M.2-II-4 4 Isolated Inputs


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PC Interface M.2 Card
Isolated Inputs 16
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 msFall-time: 4.7 ms
Non-Filter Response Rise-time: 10 μsFall-time: 30 μs
Digital I/O Lines 4
Digital Inputs Logic High: 2.0V to VCCIO (3.3VDC, 5VDC tolerant)Logic Low 0V to 0.8V
Digital Outputs Logic High: 2.0V (min) 24mA sourceLogic 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)

Delivery Information

Orders dispatched from Assured Systems USA will be delivered using FedEx.

Payment Methods & Options

Accepted payment methods for US customers include bank transfer, VISA or Mastercard in USD.

ACCES I/O: Warranty and Service Information

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.

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