104-IDIO-16 Family

32 Channel Optically Isolated Digital Card


  • 16 or 8 optically-isolated, non-polarized CMOS compatible digital inputs accept 31VDC or AC rms
  • IRQ on input change of state (COS) eliminates the need for constant polling
  • Slow/fast filter to accommodate AC voltages and noisy DC inputs
  • 16 or 8 optically-isolated fully protected high-current sourcing solid state outputs

Factory Options: (call for pricing and availability)

  • 0 to 70°C and -40 to +85°C versions available
  • Economy version without COS feature
  • Input only and output only versions
  • Expanded input voltage levels
  • RoHS Available. Please contact us for ordering information

The Model 104-IDIO-16 is a 32-channel PC/104 utility board featuring 16 optically isolated inputs and 16 optically isolated solid state outputs. The isolated, non polarized inputs may be driven by either DC sources of 3-31V (or higher by special order) or AC sources at frequencies of 40Hz to 10KHz. Optically isolating the digital inputs from each other, and from the computer, assures smooth, error-free data transmission in noisy, real-world environments. The 16 input channels are available via a 34-pin IDC type header. The fully protected solid state outputs, capable of sourcing 2A each, are inherently more reliable than electromechanical relays and give system architects a more robust product to design with. The solid state outputs are available via a 50 pin IDC type header.

Each input circuit includes a jumper selectable slow/fast filter to accommodate AC inputs and is also useful for slow DC inputs in noisy environments. The filter may be manually disabled to increase the boards typical response time to 10 µsec when used with faster DC inputs. The input impedance is 1.8K Ohms to accommodate a wide input range.

The board is installed by jumper selecting base addresses and IRQ. System interrupts are software controlled, enabling the board to generate an interrupt whenever one or more of the isolated digital inputs changes state. This eliminates the need for constant polling and greatly frees up system resources. Model 104-IDIO-16E is an economy version available without the interrupt Change of State Detection feature.

The 104-IDIO-16 is designed for use in both commercial and optionally in industrial environments of 0 to +70°C and -40 to +85°C, respectively.

Models 104-IDIO-8 and 104-IDIO-8E feature 8 optically isolated inputs and 8 optically isolated solid state outputs. Also available is Model 104-IDO-16 which has 16 outputs only, Model 104-II-16 which has 16 input only, and 104-IDO-8 which is the 8 outputs only version.

The 104-IDIO-16 series is supported by most operating systems and include a free DOS, Linux and XP/2003/2008/7/8/8.1 compatible software package. This includes sample programs and source code in "C" and Pascal for DOS, and Visual Basic, Delphi, and Visual C++ for Windows.

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

Available Software Downloads

Available Datasheets

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.


Isolated Digital Inputs

  • Number of inputs: Sixteen
  • Type: Non-polarized, optically isolated from each other and from the computer. (CMOS compatible)
  • Voltage Range: 3 to 31 DC or AC (40 to 10000 Hz)
  • Isolation: 500V*(see manual) channel-to-ground or channel-to channel
  • Input Resistance: 1.8K Ohms in series with opto coupler
  • Response Time: 4.7 mSec w/filter, 10 µSec w/o filter (typical)
  • Interrupts: Software controlled with jumper IRQ selection (models 104-IDIO-16 and 104-IDIO-8)

Isolated Digital Outputs

  • Number of outputs: Sixteen Solid State FETs (off @ power up).
  • Output Type: High Side Power MOS FET Switch.
  • Protection Features: Protected against short circuit, over-temperature, ESD, can drive inductive loads.
  • Voltage Range: 5-34VDC recommended (user supplied) for continuous use, 40VDC absolute max.
  • Current Rating: 2A maximum.
  • Turn-on time: 90usec
  • Turn-off time: 110usec


  • Interrupts: Software controlled with jumper IRQ selection (models 104-IDIO-16 and 104-IDIO-8)

Power Required

  • +5VDC @ 0.150A (all FETs ON)


  • Operating Temp: 0° to +70°C, (-40 to +85°C Optional)
  • Storage Temp: -40 to +85°C

CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.

ModelPrice (USD)

Acquisition, Control, Communication: Engineering and Systems

olark('api.rules.defineRule', { id: 'delayed_response', description: 'Will send a response to the visitor after an operator doesn't respond.', condition: function(pass) { olark('api.visitor.getDetails', function(details) { var delay = 60 / details.messageCountForThisVisit; if (details.isConversing && details.secondsSinceLastMessageToOperator >= delay && !details.secondsSinceLastMessageToVisitor) { pass(); } }); }, action: function() { olark('api.chat.sendMessageToVisitor', { body: 'Sorry about the delay. We'll get back with you as soon as possible ... but it might be via e-mail, especially if it is currently 2am Pacific.' }); olark('api.chat.sendNotificationToOperator', { body: 'Automated delay message has been sent to visitor.' }); }, perVisitor: true });