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Which of the following is NOT a reason to choose CAN over RS-485 with Modbus?

  • A.a higher raw data rate over a long cable
  • B.arbitration built into the physical layer
  • C.error detection and automatic retransmission
  • D.priority of urgent messages fixed by identifier

Answer: A

Both are limited by cable length in much the same way and RS-485 can run faster over short distances. CAN's advantages lie in the arbitration, the error handling and the message priority, all of which Modbus leaves to the software.

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