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PC/104 Single Board Computer with 300-800MHz Vortex86 CPU and Integrated Autocalibrating Data Acquisition

CPU Features

• Vortex86DX/SX CPU running up to 800MHz
• 128MB or 256MB of soldered DRAM
• On-board 2MB bootable flash drive with FreeDOS installed
• 4 USB 2.0 ports
• 2 RS-232, 2 RS-232/422/485 serial ports
• 10/100Base-T Ethernet
• 1 IDE UDMA-100 port
• Flashdisk interface
• PC/104 ISA expansion bus
• -40ºC to +85ºC operation

Data Acquisition Features

• 16 wide-range analog inputs, +/-10V down to 0-1.25V
• 16-bit A/D resolution
• Single-channel, multi-channel round robin, and multi-channel scan sampling
• 250KHz maximum sample rate
• 2048 A/D sample FIFO with programmable threshold
• Interrupt-based A/D data transfer with FIFO support
• Programmable input ranges
• 4 wide-range analog outputs with simultaneous update capability
• 12-bit D/A resolution
• Multi-range autocalibration for highest accuracy
• 40 digital I/O lines with programmable direction
• 16-bit and 24-bit counter/timers
• Field-upgradeable logic circuit for performance upgrades or custom designs

Helios is a low power, mid range performance PC/104 form factor single board computer combining a highly integrated CPU with Diamond Systems’ renowned high-accuracy data acquisition circuitry on a single board, reducing size and cost while increasing ruggedness. Helios utilizes a Vortex integrated single chip CPU operating at 300MHz or 800MHz and 128MB or 256MB of DRAM soldered on-board.

Helios incorporates advanced features such as four USB 2.0 ports, an IDE hard drive interface, mounting capability for a solid state flashdisk up to 4GB, and CRT/LVDS LCD graphics. Helios also provides a 10/100Base-T Ethernet interface, two RS-232 serial ports, two RS-232/422/485 serial ports and legacy keyboard and mouse interfaces.

Helios includes an on-board 2MB bootable flash drive with FreeDOS installed, including a working copy of Diamond's Universal Driver data acquisition software with demo programs. This flash drive offers additional cost savings for DOS applications, since no additional storage medium is required. It also enables you to quickly verify Helios's operation. Just connect keyboard, monitor, and power, and Helios boots up to DOS so you can verify proper working condition as well as test the various features on the single board computer.

Helios is extremely rugged, featuring on-board soldered DRAM and -40°C to +85°C fan-less operation. Optional hardwired jumpers and latching connectors are available for increased resistance to shock and vibration. Conformal coating is available as an extra cost option.

System Block Diagram

Integrated Data Acquisition

Helios includes a complete autocalibrating jumper-less analog and digital I/O circuit similar to our top-of-the-line PC/104 analog I/O board. It contains 16 analog inputs with 16-bit resolution and 250KHz sample rate, backed by a 2048 sample FIFO with programmable threshold. Programmable input ranges from a wide-range +/-10V down to 0-1.25V are provided. The analog circuitry also includes 4 D/A channels with 12-bit resolution and jumperless output range selection and simultaneous update capability. On the digital side, Helios provides 40 digital I/O lines with programmable direction, as well as two counter/timers for A/D sample rate control, pulse counting, frequency generation, or other applications. Its advanced control logic has more features and flexibility to fit almost any application, such as internal/external A/D clock source, scan and single-sample modes, and our exclusive programmable FIFO threshold that lets you tune the board's performance to your application. The data acquisition circuit is fully supported by our Universal Driver software for a wide range of operating systems.




Vortex86DX at 1GHz or 800MHz


256MB of on-board DRAM

Bus Interface

PC/104 (ISA)

Display Type


Display Resolution

1280 x 1024 maximum

USB Ports

(4) USB 2.0

Serial Ports

(2) RS-232; (2) RS-232/422/485


10/100Base-T Ethernet

Mass Storage

(1) IDE UDMA-100 port, Flashdisk interface

On-board storage

2MB bootable flash drive with FreeDOS installed

Keyboard / Mouse


Input power

5V ±5%

Power Consumption

HLV800-256AV: 5.4W
HLV800-256DV: 4.3W


Heat sink, no fan

Operating Temperature

-40°C to +85°C (800MHz models)
-40°C to +71°C (1GHz models)


3.550” x 3.775” (90mm x 96mm)


2.5 oz / 70.8g


HLV800-256AV: 65,535 hours




Analog Inputs

16 single-ended or 8 differential, user selectable

A/D resolution

16 bits

Input ranges

±10V, ±5V, ±2.5V, ±1.25V, 0-10V, 0-5V, 0-2.5V programmable

Max Sample Rate



±35V on any analog input without damage


±3LSB, no missing codes

On-board FIFO

2048 samples, programmable threshold

A/D and D/A Calibration

Autocalibration with software support

Analog Outputs

4, 12-bit resolution

Output ranges

±5V, ±10V, 0-5V, 0-10V

Input impedance

10^13 ohms

Output current

±5mA max per channel

Settling time

10µS max to 0.012%

Relative accuracy

±2 LSB


±2 LSB, monotonic


Reset to zero-scale or mid-scale (jumper selectable)

Digital I/O lines

Up to 40 programmable direction

Input voltage

Logic 0: 0V min, 0.8V max
Logic 1: 2.0V min, 5.5V max

Input current

1µA at 3.3V, -5µA at 0V

Output voltage

Logic 0: 0.0V min, 0.55V max
Logic 1: 2.0V min, 3.3V max

Output current

Logic 0: 64mA max at 0.55V
Logic 1: 32mA max at 2V

A/D Pacer clock

24-bit down counter

Clock source

10MHz on-board clock or external signal

General purpose

16-bit down counter


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