Discussion
Assertion (A): Two ARINC 429 buses are needed for two-way communication between units.
Reason (R): The bus is unidirectional with only one permitted transmitter.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the reason for the first. An ARINC 429 bus permits exactly one transmitter and carries data one way, so a receiver has no means of putting anything on the same wires.
Two-way communication therefore needs two buses. That is the standard's principal cost: a large aircraft accumulates hundreds of them, with the wiring weight and installation labour that implies, and it is exactly what ARINC 629 and later the switched networks were designed to escape.
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