21 pages

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429 Tutorial v1.1-GmbH

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21 pages

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ARINC429 Specification Tutorial July 2001 v1.1 GmbH Page 2 GmbH Document History Version Cover Date Created by Description 1.0 July 2001 Pat Frodyma Creation of Document 1.1 JulyPat Frodyma Edit content AIM Worldwide AIM GmbH Sasbacher Str. 2 79111 Freiburg, Germany +49-761-45 22 90 sales@aim-online.com Munich Sales Office Terofalstrasse 23 a 80689 Muenchen +49-89-70 92 92 92 waldmann@aim-online.com AIM-USA 69 Ginger Woods Road PO Box 338 Valley, NE 68064 www.aim-online.com 866-AIM-1553 866-AIM-A429 salesusa@aim-online.com AIM UK Lincoln Rd, Cressex Business Park Bucks HP12 3RB, England +44-1494-44 68 44 salesuk@aim-online.com ARINC 429 Tutorial Page 3 GmbH About this Manual This manual was developed to provide a general overview of the ARINC 429 Specification, its characteristics and applications. The ARINC 429 Specification is a copywritten document owned by Aeronautical Radio, Inc. who is responsible for its modification and distribution. This manual refers predominately to Part 1 of the 429 Specification outlining the functional description, electrical characteristics and word formats. Complete and current copies of the Specification ...

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Publié par	Zien
Nombre de lectures	76
Langue	English

Extrait

ARINC429

Specification Tutorial

July 2001 v1.1

GmbH

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Document History Version Cover Date Created by Description 1.0 July 2001 Pat Frodyma Creation of Document 1.1 July 2001 Pat Frodyma Edit content

w ww.aim-online.com

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AIM Worldwide

AIM GmbH Sasbacher Str. 2 79111 Freiburg, Germany +49-761-45 22 90 sales @ aim-online.com Munich Sales Office Terofalstrasse 23 a 80689 Muenchen +49-89-70 92 92 92 waldmann@aim-online.com AIM-US 69 Ginger Woods Road PO Box 338 Valley, NE 68064 866-AIM-1553 866-AIM-A429 salesusa @ aim-online.com AIM UK Lincoln Rd, Cressex Business Park Bucks HP12 3RB, England +44-1494-44 68 44 salesuk @ aim-online.com

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GmbH About this Manual This manual was developed to provide a general overview of the ARINC 429 Specification, its characteristics and applications. The ARINC 429 Specification is a copywritten document owned by Aeronautical Radio, Inc. who is responsible for its modification and distribution. This manual refers predominately to Part 1 of the 429 Specification outlining the functional description, electrical characteristics and word formats. Complete and current copies of the Specification can be obtained from Aeronautical Radio, Inc. Contact information is made available on page 23 of this manual. AIM provides Commercial-Off-The-Shelf (COTS) products to design, produce, integrate, test and troubleshoot all systems and capabilities mentioned in this ARINC 429 Tutorial Manual as well as for MIL-STD-1553 A./B, STANAG 3910 and PANAVIA configurations. AIM software products also support full Remote Terminal production testing, full bus analysis and complete system emulation and test capabilities per ARINC429 specifications. For detailed information on AIM solutions, visit www.aim-online.com or email sales@aim-online.com. Notice The information that is provided in this document is believed to be accurate. No responsibility is assumed by AIM for its use. No license or rights are granted by implication in connection therewith. Specifications are subject to change without notice. © Copyright 2001 : AIM

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ARINC 429 Tutorial Manual Table of Contents About this Manual ARINC 429 Specification Overview Overview of ARINC History of ARINC 429 The ARINC 429 Specification Cable Characteristics Transmission Characteristics Waveform Parameters Word Formats Parity SSM Data Data Types SDI Label Attachments to the ARINC 429 Specification ARINC Contact Information

4 7 7 8 9 10 11 12 13 13 13 15 16 17 18 19 21

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ARINC 429 Specification Overview The ARINC 429 Specification defines the standard requirements for the transfer of digital data between avionics systems on commercial aircraft. ARINC 429 is also known as the Mark 33 DITS Specification. Signal levels, timing and protocol characteristics are defined for ease of design implementation and data communications on the Mark 33 Digital Information Transfer System (DITS) bus. ARINC 429 is a privately copywritten specification developed to provide interchangeability and interoperability of line replaceable units (LRUs) in commercial aircraft. Manufacturers of avionics equipment are under no requirement to comply to the ARINC 429 Specification, but designing avionics systems to meet the design guidelines provides cross-manufacturer interoperability between functional units. Overview of ARINC ARINC stands for Aeronautical Radio, Inc., a private corporation organized in 1929, and is comprised of airlines, aircraft manufacturers and avionics equipment manufacturers as corporate shareholders. ARINC was developed to produce specifications and standards for avionics equipment outside the government for domestic and overseas manufacturers. ARINC copywrites and publishes standards produced by the Airlines Electronic Engineering Committee (AEEC). The AEEC is an international standards organization made up of major airline operators, avionics industry manufacturers and ARINC members. The AEEC sets standards for avionics equipment and systems and provides industry defined requirements for standardization of form, fit and function between various manufacturers products. ARINC publishes the AEEC produced standards under three types of documents: 1. ARINC Characteristics Characteristics are definitions of the form, fit and function of avionics equipment. These documents are equipment specific and define how a unit will operate. The ARINC 500 Series of Characteristics define older analog avionics equipment where the ARINC 700 Series are more current documents and are typically digital versions of the analog specs. 400 Series documents are general design and support documentation for the 500 Series avionics equipment characteristics. 600 Series documents are general design and support documentation for the 700 Series avionics equipment characteristics.

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Gmb H 2. ARINC Specifications Specifications are used to define  Physical packaging and mounting of avionics equipment  Data communications standards  High level computer languages The ARINC 429 Specification, Mark 33 Digital Information Transfer System falls under the Specification document category. 3. ARINC Reports Reports provide general information and best practice guidelines for airlines. Reports predominately refer to maintenance and support procedures. History of ARINC 429 The ARINC 429 Specification developed out of the original commercial aviation digital communication spec, the ARINC 419 Specification. The ARINC 419, first released in 1966 and last revised in 1983, describes four different wiring topologies, including a serial, twisted shielded pair interface used by the Digital Air Data System (DADS), known as the ARINC 575 or DADS 575 Spec. This serial topology evolved into the ARINC 429 Specification, first released as ARINC 429-1 in April 1978, and currently exists as ARINC 429-15. ARINC 429-15 was adopted by the AEEC in 1995 and is comprised of 3 parts:  ARINC Specification 429, Part 1-15: Functional Description, Electrical Interface, Label Assignments and Word Formats  ARINC Specification 429, Part 2-15: Discrete Word Data Standards  ARINC Specification 429, Part 3-15: File Data Transfer Techniques Part 1 addresses the buses physical parameters, label and address assignments, and word formats. Part 2 defines the formats of words with discrete word bit assignments. Part 3 defines link layer file data transfer protocol for data block and file transfers.

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The ARINC 429 Specification The ARINC 429 Specification establishes how avionics equipment and systems communicate on commercial aircraft. The specification defines electrical characteristics, word structures and protocol necessary to establish bus communication. ARINC 429 utilizes the simplex, twisted shielded pair data bus standard Mark 33 Digital Information Transfer System bus. ARINC 429 defines both the hardware and data formats required for bus transmission. Hardware consists of a single transmitter  or source  connected to from 1-20 receivers  or sinks  on one twisted wire pair. Data can be transmitted in one direction only  simplex communication  with bi-directional transmission requiring two channels or buses. The devices, line replaceable units or LRUs, are most commonly configured in a star or bus-drop topology. Each LRU may contain multiple transmitters and receivers communicating on different buses. This simple architecture, almost point-to-point wiring, provides a highly reliable transfer of data. St ar Topology Receiving Receiving LRU LRU Receiving LRU Transmitting Receiving LRU LRU Receiving LRU

L Tx R U Rx Tx

Receiving LRU

Rx L R Tx U Rx Tx Rx Rx Rx

Transmitting LRU

Receiving LRU Bus-Drop Topology Rx Rx Multiple Bus Design

Receiving LRU Receiving LRU Receiving LRU

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GmbH A transmitter may talk only to a number of receivers on the bus, up to 20 on one wire pair, with each receiver continually monitoring for its applicable data, but does not acknowledge receipt of the data. A transmitter may require acknowledgement from a receiver when large amounts of data have been transferred. This handshaking is performed using a particular word style, as opposed to a hard wired handshake. When this two way communication format is required, two twisted pairs constituting two channels are necessary to carry information back and forth, one for each direction. Transmission from the source LRU is comprised of 32 bit words containing a 24 bit data portion containing the actual information, and an 8 bit label describing the data itself. LRUs have no address assigned through ARINC 429, but rather have Equipment ID numbers which allow grouping equipment into systems, which facilitates system management and file transfers. Sequential words are separated by at least 4 bit times of null or zero voltage. By utilizing this null gap between words, a separate clock signal is unnecessary. Transmission rates may be at either a low speed  12.5 kHz  or a high speed  100kHz. Cable Characteristics The transmission bus media uses a 78 Ω shielded twisted pair cable. The shield must be grounded at each end and at all junctions along the bus. Line A Transmitter Receiver

Line B

Shield Ground To Receiver The transmitting source output impedance should be 75 Ω ± 5 Ω divided equally between Line A and Line B. This balanced output should closely match the impedance of the cable. The receiving sink must have an effective input impedance of 8k Ω minimum. Maximum length is not specified, as it is dependent on the number of sink receivers, sink drain and source power. Most systems are designed for under 150 feet, but conditions permitting, can extend to 300 feet and beyond.

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Transmission Characteristics ARINC 429 specifies two speeds for data transmission. Low speed operation is stated at 12.5 kHz, with an actual allowable range of 12 to 14.5 kHz. High speed operation is 100 kHz ± 1 % allowed. These two data rates can not be used on the same transmission bus. Data is transmitted in a bipolar, Return-to-Zero format. This is a tri-state modulation consisting of HIGH, NULL and LOW states. Transmission voltages are measured across the output terminals of the source. Voltages presented across the receiver input will be dependent on line length, stub configuration and the number of receivers connected. The following voltage levels indicate the three allowable states: TRANSMIT STATE RECEIVE +10.0 V ± 1.0 V HIGH +6.5 to 13 V 0 V ± 0.5V NULL +2.5 to -2.5 V -10.0 V ± 1.0 V LOW -6.5 to -13 V In bipolar, Return-to-Zero  or RZ  format, a HIGH (or 1) is achieved with the transmission signal going from NULL to +10 V for the first half of the bit cycle, then returning to zero or NULL. A LOW (or 0) is produced by the signal dropping from NULL to 10 V for the first half bit cycle, then returning to zero. With a Return-to-Zero modulation format, each bit cycle time ends with the signal level at 0 Volts, eliminating the need for an external clock, creating a self-clocking signal. An example of the bipolar, tri-state RZ signal is shown here: HIGH NULL LOW Data Represented 1 0 1 1 0

1 bit time

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