Discussion
Arrange the fields of an ARINC 429 word in transmission order:
1. Label, eight bits identifying the parameter
2. Source destination identifier
3. The data field
4. The sign status matrix
5. The parity bit
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4, 5
The 32-bit word is transmitted in that order. The label occupies bits 1 to 8 and is sent first, so a receiver can decide immediately whether the word concerns it.
The source destination identifier follows, then the data field, then the sign status matrix, and the parity bit is last at bit 32. Parity must come last because it is computed over everything before it. Note that the label's bits are themselves transmitted in reverse order within the field, a quirk of the standard's history.
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