Discussion
Arrange a MIL-STD-1553 controller to terminal transfer in order:
1. The bus controller issues a command word
2. The command word specifies the terminal and the word count
3. The controller transmits the data words
4. The remote terminal replies with a status word
5. The controller proceeds to the next scheduled message
Select the correct sequence.
Answer: D
Correct answer: 1, 2, 3, 4, 5
The sequence describes a controller-to-terminal transfer, and every step follows from the controller's authority. The controller issues a command word; that word names the terminal and the number of data words to follow, so the terminal knows what to expect.
The controller then sends the data words, and the terminal replies with a status word confirming receipt and reporting its own condition. Only then does the controller move to the next scheduled message. Nothing happens on the bus that the controller has not initiated, which is the source of the standard's determinism.
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