Discussion
Consider the following field and purpose pairs in an ARINC 429 word:
Label - Identifies the parameter carried
Sign status matrix - Reports validity and sign
Parity bit - Detects an odd number of bit errors
Label - Identifies the receiving equipment
How many of the pairs given above are correctly matched?
Answer: B
Correct answer: Only three
The first three describe their fields correctly: the label identifies the parameter, the sign status matrix reports validity and sign, and the parity bit detects an odd number of bit errors.
The fourth misstates the label as a receiver address. ARINC 429 has no addressing at all, because a single transmitter broadcasts to every receiver on the bus and each simply takes the labels it needs. Introducing an address would serve no purpose in that topology, which is why the field carries the parameter's identity instead.
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