In this paper, each controller's unique ID and PICO oscilloscope were used to measure the voltage waveform of each CAN communication line, and compare and analyze the serial decoding results. Using the voltage change level of the CAN communication line, it was possible to check whether the CAN-High line and the Low line were disconnected. And it was possible to infer the circuit disconnection point between the controller and the controller only with the unique ID information of each controller. And when the CAN-High circuit was disconnected, the voltage of the high line was measured at the same voltage level as the Low line.

• 손성배(강릉원주대학교) | Sung-Bae Sohn Corresponding Author
• 강성구(한국폴리텍대학) | Sung-Gu Kang
• 김철수(강릉원주대학교) | Chul-Soo Kim