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ARINC 429

UEI's Support for ARINC 429

ARINC 429 is the avionics data bus standard used on most high-end commercial aircraft. The standard defines both the physical and electrical interfaces of a two-wire data bus as well as the data protocol to support an aircraft's avionics network.

DNx-429-5xx: ARINC 429 Interfaces

The DNA-429-5xx and DNR-429-5xx are 12 channel ARINC 429 communications interfaces for UEI’s popular “Cube” and RACKtangle I/O chassis respectively. The DNA/DNR-429-566 offers 6 TX / 6 RX while the 429- 512 provides 12 RX channels. All boards are fully compliant with the ARINC 429 spec and support both high speed (100 kHz) and low speed (12.5 kHz) operation. The channel speed is software selectable in banks of either two or three channels. Data integrity, even when all channels are set in high speed mode is assured with the use of 256 word FIFOs on all RX and TX channels

Receive channels include the ability to filter Labels so that only data from selected channels is captured. The filter may be set to forward data from between one and 255 Labels, or may be disabled so all data is captured, regardless of source. The user may also select on a label by label basis whether all data is forwarded or only data which has changed since the last transmission. Each channel may be set such that data Receive filtering is also supported based on the Source/Destination Identifier (bits 9 & 10). Words that match the desired SDI are forwarded while those that do not are ignored. Each received word may also be time stamped with the date and time of reception (10 μs resolution). Parity errors may either be flagged and errant data trapped at the board level, or RX channels may be configured to forward data with an illegal parity bit.

Transmit channels may be set to transmit asynchronously or based upon a hardware controlled scheduler. Each channel supports a transmission table that allows up to 256 unique schedules. Transmission schedule resolution is 100 microsecond. There is also a TX mode where a label is transmitted only upon receipt of data from a preprogrammed label. Asynchronous (non- scheduled) data may be sent with three priorities. High priority data is sent immediately upon completion of the current transmission, regardless of scheduled messages. Data sent with standard priority is transmitted during times when no scheduled data is being sent. Finally, the lowest priority is data streamed from a 256 word FIFO which is sent when no scheduled, high or standard priority data is being transmitted.

Software for the DNA/DNR-429 series is provided in the UEI Framework. The framework provides a comprehensive, easy to use API supporting all popular Windows programming languages as well as supporting programmers using Linux and most real-time operating systems including QNX, RTX, RT Linux and more. Finally, the framework supplies complete support for those creating applications in all popular data acquisition and control packages, including LabVIEW, MATLAB/Simulink, DASYLab as well as any application which supports ActiveX or OPC servers.

Additional Info Available

DNx-708-453: ARINC 708/453 Interfaces

The DNA-708-453 and DNR-708-453 provide an ARINC 708 and 453 interface for UEI's popular RACKtangle chassis. The board is ideal for both simulator and on-aircraft operation for such equipment as weather radar and Ground Proximity Warning Systems. All TX/RX channels are brought out to the boards 62-pin "D" connector. A cable adaptor is also included that brings each TX/RX channel out to a standard MIL-1553 style coaxial connector.

 

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