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Which quantity does a wake up line carry?

  • A.A simple switched voltage rather than data
  • B.A data message, which instructs the module to leave its sleep state and to begin communicating upon the network
  • C.Nothing
  • D.A hard wired signal from a switch or another module, which rouses the module without any bus activity being required

Answer: A

A wake line is a plain wire that changes state, needing no transceiver to be awake. The last option describes exactly that arrangement, which makes it a correct and more descriptive version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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