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A CAN bus carries its data on

  • A.four wires, two in each direction
  • B.an open-drain pair of lines with pull-up resistors
  • C.a differential pair with defined termination
  • D.a single wire referred to a common ground

Answer: C

Differential signalling with 120 ohm terminations at both ends is what gives it immunity in a vehicle's electrical environment. It needs a transceiver between the controller and the bus, which is an extra device on the board.

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