ARINC 429 is designed to provide the interchangeability and interface of commercial aircraft Line Replaceable Units (LRUs). To know more about “A Designer’s practical guide to ARINC 429 standard“, click on the link https://www.logic-fruit.com/blog/arinc-standard/designers-guide-arinc-429-standard-specification/ About Logic Fruit Technologies Logic Fruit Technologies is a product engineering R&D & consulting services provider for embedded systems and application development. We provide end-to-end solutions from the conception of the idea and design to the finished product. We have been servicing customers globally for over a decade. The company has specific experience in various fields, such as -FPGA Design​​​ & hardware​​​ design -RTL​​​ IP Design -A variety of digital protocols -Communication buses as1G, 10G Ethernet -PCIe​​​ -DIGRF​​​ -STM16​​​/64 -HDMI​​​. Logic Fruit Technologies is also expert in developing, -software-defined radio (SDR) IPs -Encryption -Signal generation -Data analysis, and -Multiple Image Processing Techniques. Recently Logic Fruit technologies are also exploring FPGA acceleration on data centers for real-time data processing. **Our Social Media Channels** Facebook: https://www.facebook.com/LogicFruit/ ​​​Twitter: https://twitter.com/logicfruit​​​ LinkedIn: https://www.linkedin.com/company/logi… Website: https://www.logic-fruit.com/​​ #LFT​​​ #LogicFruitTechnologies​​​ #LogicFruit​ Interested to view more Slide Shares, Click on the below links, https://www.slideshare.net/LogicFruit/arinc-the-ultimate-guide-to-modern-avionics-protocol https://www.slideshare.net/LogicFruit/arinc-629-digital-data-bus-specifications https://www.slideshare.net/LogicFruit/afdx https://www.slideshare.net/LogicFruit/end-system-design-parameters-of-the-arinc-664-part-7 https://www.slideshare.net/LogicFruit/a-swift-introduction-to-milstd https://www.slideshare.net/LogicFruit/compute-express-link-cxl-everything-you-ought-to-know

1. A Designer’s practical
guide to ARINC 429
standard specification
*This presentation is the intellectual property of Logic Fruit Technologies . Any plagiarism or misuse is
punishable according to Indian Laws.
September 2022

2. • The ARINC 429 Specification defines basic requirements for the transmission of digital data
between commercial avionics systems. For ease of design implementation and data
communications, signal levels, timing, and protocol characteristics are specified.
• ARINC 429 is designed to provide the interchangeability and interface of commercial
aircraft Line Replaceable Units (LRUs). In layman’s terms, the ARINC protocol is designed
to support communication in the Local Area Network (LAN) of the avionics.
• ARINC 429 is also known as the Mark 33 Digital Information Transfer System (DITS) bus.
Although used mostly in the field of avionics, these buses are also used in the field of
ground vehicles, weapons systems, and other commercial and military equipment.
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3. The word structure, the electrical component characteristics, and the protocol needed for the requirement
of successful communication is defined in the specifications. The Simplex, twisted shielded pair data bus
standard Mark 33 DITS bus is used by ARINC 429. Both the hardware and data formats needed for bus
transmission are specified by ARINC.
A single connected transmitter or source consists of the hardware connected to from 1-20 receivers or
sinks on one twisted wire pair. Data can only be transmitted in one direction (unidirectional connection), for
bi-directional communication, it requires two channels or buses.
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4. ARINC-429 WORD FORMAT
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• SDI (Source Destination Identifiers): Used by a transmitter connected to multiple receivers to identify
which one should process the message. If not needed, the bits may be used for data.
• Data: The information that is being communicated
• SSM (Sign Status Matrix): Used to indicate sign or direction, and also to test if data is valid
• Parity (odd): Used for error detection
• Label: Labels are first transmitted by MSB, followed by the remainder of the ARINC phrase, first transmitted
by LSB.

5. Data Types specified in ARINC 429:
 Binary Coded Decimal (BCD):
 Binary Number Representation (BNR):
Discrete Data:
 Maintenance Data / Acknowledge:
 Williamsburg/Buckhorn Protocol:
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6. Applications of ARINC 429 standard and Extending to
other ARINC standards:
High reliability and small data rates at the cost of wire weight are provided by the unidirectional ARINC
429 network. In the early 1980s, the ARINC 429 was first used on the Airbus A-310 and the Boeing B-757
and B-767 aircraft.
In the 21st century, modern aeroplane designs continue to use the ARINC 429 bus for data transmission.
The relative simplicity and integrity of the bus, as well as the ease of certification, are features that
contribute to the continued selection of ARINC 429 buses when the required data bandwidth is not
critical.
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