Each control unit passes an electric current to the termination circuits when transmitting CAN communication signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN communication system transmits and receives CAN communication signals by the potential difference.

Component | Description
Main line | CAN communication line between splices
Branch line | CAN communication line between splice and a control unit
Splice | A point connecting a branch line with a main line
Termination circuit | Refer to CAN Communication Control Circuit.