ISO 11898-2 provides some immunity to common mode voltage between transmitter and receiver by having a 0 V rail running along the bus to maintain a high degree of voltage association between the nodes. Also, in the de facto mechanical configuration mentioned above, a supply rail is included to distribute power to each of the transceiver nodes. The design provides a common supply for all the transceivers.
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CAN总线本来的场景就是车用总线，是典型的强电磁干扰共地环境，设计指标都是按照这个来制定的，不共地从一开始就不是考虑因素，所以后来扩展到工业控制领域有不共地需求也只是建议将所有PHY隔离然后共用一个电源，这才是业界标准做法，没必要自己重新发明轮子。
ISO 11898-2 provides some immunity to common mode voltage between transmitter and receiver by having a 0 V rail running along the bus to maintain a high degree of voltage association between the nodes. Also, in the de facto mechanical configuration mentioned above, a supply rail is included to distribute power to each of the transceiver nodes. The design provides a common supply for all the transceivers.
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