PC/104 Analog Input Board

Analog Input:

  • 8 channels, 12 bit resolution
  • Single Ended or True Differential (std)
  • Bipolar/unipolar programmable ranges 0-5V, 0-10V, 5v, 10V, (4-20mA factory opt.)
  • 100K samples per second
  • Timer or Software driven data acquisition
  • Direct Sensor Interface, optional gain of 1-200

Digital Input/Output:

  • 24 parallel bits (two 8 bit ports, two 4 bit ports)
  • 64mA sink, 32mA source (ports A and B)
  • I/O pulled up to 5V
  • Change of state detect on port C
  • Type 82C55 PPI mode 0 (1 and 2 optional)
  • Industry Standard 50 pin header

Timer/Counter: Type 82C54 (3x16 bit)

  • Software Supported Modes:
    • Three 16-Bit type 82C54
    • Event counter, Frequency output
    • Frequency and Pulse measurement

I/O Connectors:

  • Two Industry Standard 50 pin headers

  • RoHS Available. Please contact us for ordering information

    The following functions are available in many configurations giving the user the ability to specify exactly whats needed. Interrupts are individually or globally enabled or disabled via software. A status register is provided to determine the interrupt source.


    The Analog Inputs feature software programmable gain with ranges of 0-5V, 0-10V, 5V, and 10V. The configuration employs an instrumentation pre-amplifier per channel which allows for differential inputs, 200V Common Mode Rejection, high input impedance, and optional factory channel by channel pre-settable gain (1-200) to accommodate low-level inputs from sensors. Inputs 4-20mA are available as a factory-installable option.


    The circuit uses an 82C54 (3 sixteen bit counter/timers). The user has access to each counter/timers gate, clock, and output signals. The output of counter two can be used to generate an interrupt. The software package supports counting events, frequency output, pulse and frequency measurement.


    The circuit uses an 82C55A PPI with mode 0 supported. Ports A and B (16 lines) are buffered and pulled up to 5V. Port C features Change of State detection.


    The package includes a setup program detailing all jumper settings. Also included are IRQ drivers, samples for DOS, and utilities for Windows operating systems (XP -> 10, both 32 & 64 bit). Full register-level support for use in custom real-time or embedded operating systems.

    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.


    Analog Inputs

    • No. of Channels: Eight true differential.
    • Programmable Ranges: 0-5V, 0-10V, 5V, 10V, (4-20mA as a factory option)
    • Conversion Frequency: 100K Samples per Second
    • Resolution: 12-Bit
    • Differential Input Impedance: 2Meg Ohms w/pre-amp
    • Preamplifier gain: 1 standard, up to 200 upon request
    • Reference Output Voltage: 4.096V 0.02V
    • Common Mode Voltage: 200V
    • Common Mode Rejection Ratio: 86dB typical
    • Integral Nonlinearity: 1 LSB maximum
    • Full Power-Down Mode: 1µA maximum
    • Standby Power-Down Mode: 400µA maximum
    • Accuracy: 0.2% of full scale
    • Gain Temperature Coefficient: 6 ppm / C typical, bipolar; 8ppm/ C typical, unipolar
    • Noise levels: 1 LSB typical
    • A/D triggering methods Ctr/Tmr or Software

    Digital Inputs/Outputs

    • Programmable Peripheral Int.: 82C55A
    • Channels: 24, pulled up to 5V via 10K (or pulled down to ground)
    • Buffered Channels: 16 (ports A & B)
    • Sink & Source Current: 64mA & 32mA respectively
    • Modes supported: Mode 0 (1 and 2 are factory options)
    • Change of State Detection 8 inputs (port C)


    • Peripheral Interface Timer: Type 82C54
    • Counters 3 x 16-Bit down counters
    • Clock Frequency Output: 1Mhz
    • Inputs/Outputs Fully Buffered
    • Native Modes: Pulse on terminal count, retriggerable one-shot, rate generator, square wave, software triggered strobe, hardware triggered strobe.
    • Software Support: Event Counter, Frequency Output, Frequency and Pulse Measurement


    • Power Required: +5V @ 40mA, 12 @ 30mA; with optional 12V DC/DC conv. +5V @ 240mA
    • Environmental: 0°C to +70°C standard, optional without DC/DC converter -40°C to +85°C
    • Interrupt Requests: Eleven channels, IRQ 3-7, 9-12, 14, 15
    • Interrupt Status Register: Indicates source(s) of interrupt
    • Interrupt Enable/Disable: Software Controlled

    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

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