In ARINC 429, which field identifies the data parameter carried on the data field?

In ARINC 429, which field identifies the data parameter carried on the data field?

• A. 24-bit word with label and data.
• B. 64-bit word with label, data, and parity.
• C. 16-bit word with parity.
• D. 32-bit word with label, data, SSM, and parity/check; label identifies parameter, data carries value.

Answer: (D)

The field that identifies the data parameter carried on the data field is the label. In ARINC 429, each word is 32 bits and is organized as an 8‑bit label, a 19‑bit data field, a 2‑bit SSM, and a parity bit. The label names the parameter being transmitted, while the data field carries the actual value for that parameter. This separation allows different parameters to be represented by different labels, with the data field providing the corresponding value. The SSM indicates status, and the parity bit provides error checking, but the label is what identifies which parameter the data value represents.

The field that identifies the data parameter carried on the data field is the label. In ARINC 429, each word is 32 bits and is organized as an 8‑bit label, a 19‑bit data field, a 2‑bit SSM, and a parity bit. The label names the parameter being transmitted, while the data field carries the actual value for that parameter. This separation allows different parameters to be represented by different labels, with the data field providing the corresponding value. The SSM indicates status, and the parity bit provides error checking, but the label is what identifies which parameter the data value represents.