Can Communication Line

The CAN communication line is a twisted pair wire consisting of strands of CAN-H and CAN-L and has noise immunity.

Fig 1: Identifying CAN Communication Line

Courtesy of NISSAN NORTH AMERICA, INC.

NOTE: The CAN communication system has the characteristics of noise-resistant because this system produces digital signals by using the potential difference between the CAN-H line and the CAN-L line and has the twisted pair wire structure.

Since the CAN-H line and the CAN-L line are always adjacent to each other, the same degree of noise occurs, respectively, when a noise (1) occurs. Although the noise changes the voltage, the potential difference (2) between the CAN-H line and the CAN-L line is insensitive to noise. Therefore, noise-resistant signals can be obtained.

Fig 2: CAN-H Line And CAN-L Line Voltage Graph

Courtesy of NISSAN NORTH AMERICA, INC.