Having covered the basic concept of the CAN data flow, let's examine how a node physically interfaces to the bus. The node produces a 'dominant' value by simultaneously driving the "C_HI" line and the "C_LO" line low. That is, it actively creates a positive differential voltage between these signals. A 'recessive state' is created on the CAN bus whenever all nodes on the network leave the "C_HI" and the "C_LO" lines in a high-impedance state. That causes the termination resistors to passively create a zero differential voltage between these signals.