When the CAN bus uses twisted pair wires, these interference problems can be solved very well. The CAN interface adopts the differential signal transmission method. Differential signaling is a method of transferring information using two complementary electrical signals. Taking high-speed CAN as an example, different logic states are transmitted through CANH and CANL two signal lines. The receiving circuit only identifies the signal difference between the two signal lines. The interference signal generally exists in the form of common mode. When the bus is interfered At the same time, the two buses will be affected at the same time, but their differential voltage will not be affected. Compared with the single-ended signal transmission method, the differential signal transmission method has better anti-interference ability.