Discussion
Match each ARINC 429 field in List I with its purpose in List II.
List I
A. Label
B. Source destination identifier
C. Sign status matrix
D. Parity bit
List II
1. Identifies the parameter carried
2. Distinguishes among intended receivers
3. Reports validity and sign
4. Detects an odd number of bit errors
Select the correct match.
Answer: C
Correct answer: A-1, B-2, C-3, D-4
The four fields appear in the order they are transmitted and each answers a different question. The label says what parameter the word carries; the source destination identifier distinguishes among intended receivers.
The sign status matrix reports validity and sign, letting a source disclaim its own output; and the parity bit, last in the word, detects an odd number of bit errors. Note the division: two fields identify, one qualifies the value and one checks the transmission.
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