Red Seal Electrician Practice
Signalling and communicationQuestion 132 of 1506

In half-duplex communication, how can devices send and receive?

  1. Each device can send or receive, but never both together
  2. Both devices send and receive at the same time
  3. Only one device can send, ever
  4. Both only receive
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Correct answer: Each device can send or receive, but never both together

The text compares it with two tin cans on a string.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 14.3: Data Flow

Practice signalling and communication

Questions last reviewed: 18 October 2026