Scientific Solutions ® Inc.
DADIO ®
| Product Description | The DADIO has two primary functions:
digital-to-analog conversion and digital I/O. The DADIO features 4
independent 12-bit digital-to-analog converters. All four DACs can
change output states simultaneously (doubled buffered) or
independently. The DADIO also features 24 lines of programmable digital
I/O.
The DADIO was first introduced in 1981. It has been available and supported continuously ever since, and is used in many diverse applications including laboratory testing, entertainment digital audio and multi-sonic music synthesis, laser control, and factory automation. |
Product Description
Four independent 12-bit digital to analog (DAC) converters deliver 5mA across one of four output ranges. The four DACs can change their outputs individually or simultaneously. 24 lines of TTL compatible digital I/O complete this multipurpose product. Our optional LabPac for DOS or LabPac32 for Windows software provides a flexible, multipurpose interface for customized programs using any language.
Our Solution Includes
- DADIO - D/A and Digital I/O card for ISA bus PCs
- CD with LabPac32 and documentation
Key Features
- 4 independent, 12-bit Digital to Analog (DAC) converters
- 4 output ranges for each DAC
- All four DACs can change output states simultaneously (double buffered)
- 24 lines of programmable digital I/O
- RF shielded D-shell connectors
- Hardware Interrupts
Applications
- Process Automation (digital relay control, continuous motor control)
- Laser Marking Systems (power setting, Pulse-width modulation control, stepper/servo pulsing)
- Digital Audio and Music Synthesis (4 voice additive synthesis, quadraphonic sound sculpting)
Functional Description
Both DADIO functions are on one full length PC board. Interfacing to external devices is handled through standard, RF shielded D-shell connectors. Software communicates through sixteen 8-bit I/O locations (using the IN/OUT instructions). Programming information is in the manual.
Digital-to-Analog Conversion (DAC)
Four independent 12-bit digital to analog (DAC) converters source 5mA on four voltage ranges. The four voltage ranges, independently selectable (jumper blocks) for each DAC, are: 0 - 10V, 0 - 5V, ±10V, and ±5V. The analog outputs are located on a 9-pin D-shell connector. The DACs are double buffered and can change either individually or simultaneously.
Digital Input/Output (DIO)
The 24 lines of TTL compatible I/O (8255A) are addressable in two groups of eight and two groups of four:
- 24 input
- 24 output
- 8 input, 16 output
- 16 input, 8 output
- 12 input, 12 output
All outputs are latched. Simple input is unlatched while strobed input is latched. Digital I/O is programmed with four 8-bit I/O locations, one command register configures the 24 lines and three I/O locations reflect the TTL data. Each line sources 200uA or sinks 1.7mA and is located on 25-pin D-shell connector.
Interrupts
Hardware interrupts allow the computer's processor to react to special events when they occur. The DADIO provides two software enabled sources for interrupts (the handshake strobes for digital I/O). External sources can also be used.
Technical Specifications
| Number of bits | 24 bits of Digital I/O |
|---|---|
| Programmable Modes Full 8255 support |
|
| Data Transfer | Programmed I/O |
| Logic Thresholds | TTL |
| Current Source | 200 microamps |
| Current Sink | 1.7 milliamps |
| ISA Card Dimensions (aprox.) | 4.2" high x 13" long (107mm x 330mm) |
|---|---|
| Data Connectors | Digital I/O: DB25 Analog Out: DE9 |
| Bus Interface | Single 8-bit or 16-bit ISA slot |
|---|---|
| IRQ Channels | IRQ 2 -7, jumper selectable |
| Address | 16 I/O locations Required Any I/O Address, switch selectable |
| Bus Load | 1 TTL load/bus line maximum |
| Operating Temperature | 0º to 70º Celsius |
|---|---|
| Storage Temperature | -25º to +85º Celsius |
| Relative Humidity | To 95% non-condensing |
| Agency Approvals | Class A, CE-Mark |
Specifications subject to change without notice.
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