ARINC Protocol

Overview of ARINC Protocol

ARINC has provided leadership in developing the specifications and standards of the avionics equipment, and one of these specifications is the focus of this tutorial. Industry-wide committees prepare the specifications and standards. ARINC Specification of the 429 was developed and is maintained by the Airlines Electronic Engineering Committee (AEEC) comprising members of the represent airlines, government, and ARINC.

The ARINC 429 Specification defines the standard requirements for the transfer of the digital data between avionics systems on commercial aircraft. ARINC 429 is also known as the Mark of the 33 DITS Specification. Signal levels, timing, and protocol characteristics are defined for the ease of design implementation and data of communications on the Mark 33 Digital Information Transfer System (DITS) bus.

ARINC 429 is a privately copywritten with the specification developed to provide interchangeability and interoperability of the line replaceable units (LRUs) in commercial aircraft. Manufacturers of avionics equipment are under no requirement to comply with the ARINC 429 Specification, but designing avionics systems to meet the design guidelines provides cross-manufacturer interoperability between functional units.

Introduction to ARINC Protocol:

The ARINC stands for Aeronautical Radio Incorporated, 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 the standards produced by the Airlines Electronic Engineering Committee (AEEC). The AEEC is an international standards organization made up of the 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.

Features Of ARINC Protocol:

  • ARINC-429 is a standard for requirements for the transfer of digital data between avionics systems on commercial aircraft.
  • ARINC-429 is also known as the Mark33DITS (Digital Information Transfer system)Specification.
  • ARINC-429 uses simplex, twisted shielded pair data bus.
  • It consists of the one transmitter and multiple receivers (up to 20 receivers connected to one twisted pair of wire).
  • It does not have the Bus monitor, Remote terminal, or Bus controller as that of 1553B data Bus.
  • A transmitter may talk only to an umber of the 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 the data have been transferred. This handshaking is performed using the particular word style, as opposed to a hardwired 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.
  • Communication 429 data bus uses 32-bit words with odd parity. The wave for muses is a bipolar return to zero with each bit lasting either 70 or 83 microsec+_2. 5 percent or 10microsec+_2. 5 per cent depends on the operating speed of the bus.
  • ARINC-429 data bus operates at two speeds. –Low-speed(12.5kHz). –Highspeed(100kHz).
  • The low-speed bus is used for the general purpose of the low critical application.
  • The high-speed bus is used for transmitting large quantities of data or flight critical applications.
  • 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 ARINC429, 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.
  • Transmission rates may be at either alow speed–12.5kHz–or high speed–100kHz.

Different Stadard Protocol in ARINC Protocol

ARINC 429 Standard Protocol

ARINC 429 is a point-to-point protocol used for sending and receiving data between avionics systems. It is a unidirectional protocol, meaning that it only allows data to be transmitted in one direction. ARINC 429 supports a maximum data rate of 100 kbps and can support up to 20 receivers.

The protocol uses a single data bus to transmit data, which makes it easy to implement in avionics systems. ARINC 429 is widely used in commercial and military aircraft for various applications, such as engine control, navigation, and flight control.

ARINC 561 Standard Protocol

ARINC 561 is a protocol used for transmitting analog signals between avionics systems. It is used for applications that require high-accuracy analog signals, such as fuel flow measurement and temperature sensing. ARINC 561 uses a differential voltage signaling scheme to transmit analog signals over long distances, which makes it less susceptible to noise and interference.

ARINC 568 Standard Protocol

ARINC 568 is a protocol used for transmitting video signals between avionics systems. It is used for applications such as in-flight entertainment systems and cockpit displays. ARINC 568 supports multiple video formats, including composite video, component video, and VGA.

ARINC 615 Standard Protocol

ARINC 615 is a protocol used for software loading and data transfer between avionics systems. It supports both data transfer and file transfer, making it useful for updating software and firmware in avionics systems. ARINC 615 supports both real-time and non-real-time data transfer, which allows for flexibility in system design.

ARINC 664 (AFDX) Standard Protocol

ARINC 664, also known as Avionics Full-Duplex Switched Ethernet (AFDX), is a high-performance protocol that is similar to Ethernet but is specifically designed for avionics applications. AFDX provides deterministic communication, which means that messages are delivered within a guaranteed time interval. It also supports redundancy and end-to-end message integrity checks, which make it highly reliable. AFDX can support both real-time and non-real-time traffic and is used for various applications in aircraft systems, including flight controls, navigation, and entertainment.

Conclusion of ARINC Protocol

ARINC protocols are essential for communication between different avionics systems in aircraft. The different protocols provide a wide range of features and functionalities, from simple point-to-point data transfer to high-performance, deterministic communication. The use of ARINC protocols in avionics systems ensures the safety, reliability, and efficiency of aircraft operations.

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