Discussion
An ARINC 429 bus allows two units to exchange data over one pair of wires. True or false?
Answer: C
Correct answer: False, the bus is unidirectional with one transmitter
ARINC 429 defines one transmitter and up to twenty receivers, with data flowing one way. A receiver has no transmitter on that pair, so there is nothing to reply with, and two transmitters on one bus would corrupt each other.
Nor can they take turns: the standard provides no arbitration, no token and no scheduling mechanism to make alternation safe. Two-way communication needs two buses. Speed and parity are irrelevant - the limitation is what may be connected to the medium.
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