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The Controller Area Network (CAN) protocol, featuring versions 2.0A (Basic CAN, 11 bits) and 2.0B (Extended CAN or Peli CAN, 29 bits), encompasses four message types: Data Frame, Remote Frame, Error Frame, and Overload Frame. The CAN Bus utilizes two primary data outputs known as CAN High (CAN_H) and CAN Low (CAN_L). In the context of automobile electronics applications, the signal voltage specifications are critical. CAN_H operates within the voltage range of 2.5V to 3.5V, while CAN_L maintains a voltage range of 1.5V to 2.5V.

Furthermore, the CAN protocol exhibits flexibility in data transmission through the incorporation of CAN FD (CAN with Flexible Data-Rate). In CAN FD mode, data transfer involves 64 bytes per data, inclusive of CRC17/CRC21 for enhanced reliability and integrity. This adaptability in data rate is instrumental in meeting the diverse requirements of modern automobile electronics.

Protocol Analysis for Vehicle and Automation Industries

Differential signal analysis holds significant importance in the fields of vehicle, robot design, and automation industries. The demand for protocols in the context of electric vehicles is notably on the rise. For the effective operation of Advanced Driver Assistance Systems (ADAS) and Automatic Driving Systems (ADS), the measurement of protocols becomes imperative, especially for large-scale systems and extensive sensors, which may include LiDAR/Radar. Commonly employed protocols in this domain encompass RS485 (EIA485), SENT, CAN, LIN, Flexray, Ethernet AVB (MII), and others.

Solutions for the Differential Signal Analysis

  • Logic analyzer & Protocol analyzer: TB3016B (differential signals can be measured directly).

The Acute Technology Inc. TravelBus 3000 series 2-in-1 analyzer, designed for both protocol and logic analysis, allows direct measurement of differential signals such as CAN physical layer, RS485 (EIA485), and more. Utilizing the bus analysis module enables efficient and extended-duration measurements.

For automotive analog signal measurement, the Acute TravelScope TS3124H DSO with 16-bit resolution is an ideal choice. This device is equipped with diverse protocol decode and trigger features, supporting protocols such as CAN, RS485, I2C, SENT, etc. Additionally, it pairs seamlessly with the high-voltage differential probe ADP series products.


Channel: The differential data from the DSO channel (CAN_H or CAN_L) is shown by default.

Auto detect Data Rate: Check this option for auto-detecting the CAN bit rate by the LA Viewer; this option will be disabled when enabling CAN FD decode, the maximum input range of the Data rate is from 5Kbps-1Mbps.

Show scale in the waveform: Display the scale in the Waveform Window, this option will be disabled when enabling CAN FD decode.


High-Speed Protocol for Vehicle & Automation Industries

In addition, for faster vehicle sensor and communication protocols, for example Ethernet AVB(SGMII、GMII、RGMII、MII、RMII), Memory & Storage(Nor Flash, NAND Flash), Display&Camera(MIPI DSI, MIPI CSI). Please refer to the following products.

MSO2000 series: RGMII, MII, RMII, NAND Flash, NOR Flash
TL4000 series
LA4000 series
: GMII (Include above protocols)
: MIPI DPHY, SGMII(Include above protocols)

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