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A MIL-STD-1553 message contains one command word, 32 data words and one status word. The total number of words is

  • A.35
  • B.34
  • C.33
  • D.32

Answer: B

Correct answer: 34

Simply add the words:

\[ 1 + 32 + 1 = 34 \]

Thirty-two is the maximum number of data words a single MIL-STD-1553 message may carry, so this is the largest controller-to-terminal transfer the standard allows. The five-bit word count field is why: it encodes 1 to 31 directly and uses zero to mean 32. A transfer of more data must be split across several messages, each with its own command and status words.

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