The CAN high line and CAN low line in automobile circuit diagram are introduced in detail.

CAN-h is a high-level data line, CAN-L is a low-level data line, and Can-H and can-l are twisted together, which can make can bus insensitive to electromagnetic interference.

Compared with CAN-L, Can_h has the following three different characteristics:

1, the simple difference is that the colors of the two lines are different, and CAN_H has the main and secondary colors, and CAN_L has one color.

2. Secondly, when the voltage signal is 2.5V, it is 1, indicating that the dominant high is 3.5 and the low is 1.5, indicating that it is recessive.

3. A part of CAN-H is a high-level data line, and can-l is a low-level data line. CAN-H and CAN-L are twisted together, which can make can bus insensitive to electromagnetic interference.

Extended data:

When the car key switch is turned on, the starter electromagnetic switch supplies power, and the ignition part of the gasoline car also supplies power at the same time. The starter electromagnetic switch is attracted, and the starter rotor turns on and rotates. The starter gear is thrown out and meshed with the big gear ring on the flywheel of the engine, the engine starts to rotate, and the gasoline engine ignites and burns. Diesel engine compression ignition, engine work. The driver releases the key switch, the key switch returns to the "working" position, the starter stops running, and the engine continues to work.