Discussion
Statement I: An ARINC 429 reply requires a second bus running the other way.
Statement II: The bus is unidirectional with a single permitted transmitter.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
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 only, so a receiver has no means of putting anything on the same wires.
Two-way communication therefore needs two buses, one in each direction. That is the standard's principal cost: a large aircraft accumulates hundreds of such buses, and it is exactly what ARINC 629 and later the switched networks of ARINC 664 were designed to escape.
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