Library of capabilities: QNX RTOS support for DAQ

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Canton, MA —QNX real-time operating system (RTOS) support is now available for United Electronics Industries ' (UEI) PowerDNA series of data acquisition and control cubes. The library is said to give QNX developers the functionality and ease of use of UEI's standard Microsoft Windows and Linux interfaces while taking advantage of QNX's deterministic timing. Library may be deployed on any host computer running the QNX RTOS and connected to the PowerDNA cube over Ethernet (10/100baseT).

Product is reportedly compatible with all versions of QNX including revisions 4.x and 6.x. Support package includes example and demonstration programs and documentation. QNX library supports three operating modes:

• Immediate mode : Host polls data from or writes data to the cube in a software-controlled mode.

• DMAP : Cube acquires data paced by its internal clock and transfer each scan over the network to the host. DMAP mode is intended for high-speed, real-time control applications. Protocol reportedly "guarantees" 1,000 analog/digital I/O points are updated in less than a millisecond.

• Circular buffer : In the advanced circular buffer (ACB) mode, the cube acquires data paced by its internal clock and transfers it into buffers over the network to the host. The buffer ensures that no data are lost when the network is performing other tasks.