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CAN2-Slide25

Specifically, when two CAN nodes negotiate for the bus at the same time, a dominant bit state will override a recessive bit state. When a node transmits a recessive state on the bus, but detects a dominant state on its receiver, it knows that a higher-priority message is being transmitted and immediately ceases transmission. The losing node will renegotiate for the bus as each new opportunity arises in successive bus cycles, until the message is transmitted.

PTM Published on: 2011-11-02