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Can Bus:

  • Twisted Pair with

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  • a 120 Ohm resistor to

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  • terminate, it stabilizes the voltage and

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  • lessens external noise.

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  • No International Standard, however each enterprise usually has their own internal standardization

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The predominant choice for the physical layer of CAN bus and CAN Open communication involves employing twisted-pair copper cables with a shared ground. In this setup, a pivotal component is the inclusion of a 120 Ohm resistor positioned between each cable, serving to enhance voltage stability and mitigate the impact of external noise.

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DeviceNet:

  • Has a set standard, three types of cables:  Thick Round Cable, Thin Round Cable and Flat Cable
  • There is standard for how long each branch from the main cable can be and how long they can be combined, this is drop length and cumulative drop length
  • Connectors used are screw, mini and micro connector