CONTROLLER AREA NETWORK (CAN) SYSTEM CONSTRUCTION/OPERATION

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CAN system

• Transmission of information to and from modules is done using time-division multiplexing.
• The signals transmitted from a single module are communicated to all other modules via the twisted pair wiring harnesses. When each module receives a relevant signal, output is performed based on the signal.

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Time-Division Multiplexing

• Control signals are converted to data composed of 0s and 1s, and transmitted.
• By transmitting multiple signals which are divided by time, more information can be transmitted using fewer wiring harnesses.

Transmission between conventional modules

  • To illuminate 5 individual bulbs, 5 separate communication paths from switch to bulb are needed.
  • To illuminate bulbs B and C, it is necessary to connect switches B and C to pass current along the communication paths.

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Transmission between modules based on time-division multiplexing

  • To illuminate 5 individual bulbs, only one communication path from switch to bulb is necessary.
  • To illuminate B and C bulbs, the transmitting module combines B and C into a single data, converts data A, D, and E to 0, and then transmits. When the signal is received by the module, bulbs B and C with data signals conferred to 1 are illuminated.

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