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The ARINC 429 unit of transmission is a fixed-length 32-bit frame, which the standard refers to as a 'word'. The bits within an ARINC 429 word are serially identified from Bit Number 1 to Bit Number 32 [4] or simply Bit 1 to Bit 32. The fields and data structures of the ARINC 429 word are defined in terms of this numbering.
ARINC 429 operates in such a way that its single transmitter communicates in a point-to-point connection, thus requiring a significant amount of wiring which amounts to added weight. Another standard, ARINC 629, introduced by Boeing for the 777 provided increased data speeds of up to 2 Mbit/s and allowing a maximum of 120 data terminals. This ...
Most civilian aircraft use one of 3 serial buses: the Commercial Standard Digital Bus (CSDB), [1] ARINC 429, or AS-15531. The Commercial Standard Digital Bus is a two-wire asynchronous broadcast data transmission bus. Data is transmitted over an interconnecting cable by devices that comply with Electronic Industries Association (EIA) RS-422A.
The ARINC 615 standard covers "data loading" over ARINC 429. ARINC 615A is a standard that covers a "data loading" protocol which can be used over various bus types such as Ethernet, CAN, and ARINC 664. ARINC 618 is a standard that covers a data transmission protocol called "Character Oriented Protocol". ARINC 619 is a standard that covers a ...
This design was easier to manufacture, easier to maintain and provided the flexibility to add and remove options without affecting the entire vehicle's wiring architecture. Each module, a node on the vehicle network, controls specific components related to its function and communicates with the other modules as necessary, using a standard ...
Output interfaces typically are ARINC 429, Gillham or even IEEE 1394 (Firewire). The data provided may be true airspeed, pressure altitude, density altitude and Outside Air Temperature (OAT), but with no involvement in aircraft attitude or heading, as there are no gyroscopes or accelerometers fitted internally.
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Communication between the modules can use an internal high speed Computer bus, or can share an external network, such as ARINC 429 or ARINC 664 (part 7). However, much complexity is added to the systems, which thus require novel design and verification approaches since applications with different criticality levels share hardware and software ...