Discussion
ARINC 429 word structure.
| Field | Bits | Purpose |
|---|---|---|
| Label | 8 | Identifies the parameter |
| Source destination identifier | 2 | Distinguishes among receivers |
| Data | 19 | Carries the value |
| Sign status matrix and parity | 3 | Validity, sign and error detection |
Which field must a receiver check before using the data?
Answer: B
Correct answer: The sign status matrix
The sign status matrix reports whether the value is normal, a functional test result, no computed data or a failure warning. A word can arrive perfectly intact and still carry a value its own source has declared unusable.
Parity only tells the receiver the bits were not corrupted in transit; the label only tells it what the parameter is; the source destination identifier only says which receiver it is for. None of them says whether the value means anything, which is the SSM's job.
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