DLT Support in CANape

As the complexity of automotive electronic and electrical systems increases, it is crucial to quickly and accurately diagnose and track system status. To this end, AUTOSAR introduces the DLT (Diagnostic Log and Trace) module.

Part.01

DLT Overview

The DLT module is a powerful diagnostic tool that can collect and manage log and trace information in the vehicle system. Through in-depth analysis of this information, it can help users analyze and solve problems and faults in electronic and electrical systems.

The main functions of the DLT module are as follows:

Log information collection: The DLT module can collect various events, status and fault information when the system is running. This information can be used to analyze the operating status of the system, or for fault analysis and problem location when a system failure occurs.

System tracking: The DLT module can track various events during system operation. By recording various system behaviors and observing the details of system operation, the system can be analyzed and optimized.

Fault diagnosis: When a system failure occurs, the DLT module can collect logs and tracking information to facilitate users to obtain information for fault diagnosis and quickly locate the problem.

When the ECU is running, the DLT module will continuously collect log information and tracking information. Users can access the DLT module through external tools to obtain diagnostic information, log information and tracking information, and record and store the information for subsequent analysis of the ECU and diagnosis and positioning of problems, thereby improving the efficiency of development and diagnostic testing.

Part.02

CANape’s support for DLT

As a professional measurement and calibration software in the field of automotive electronics, CANape provides users with a variety of powerful measurement and analysis functions. The DLT function module in CANape can help customers easily collect and record diagnostic information inside the ECU during the integration test phase. CANape introduced the DLT module information collection function from version 18.0. With the continuous improvement of the DLT module, CANape's support for DLT module functions is more comprehensive, the interface is more intuitive, and the analysis is more convenient.

CANape 21.0 supports data collection in both Verbose and Non-Verbose modes for DLT modules. The main differences between the two are as follows.

Verbose Mode

In Verbose mode, the DLT module sends complete diagnostic description information, which has a large amount of data and high bandwidth requirements. Although the DLT protocol itself does not specify the bus type, it is recommended to use a high-bandwidth bus, such as Ethernet .

After CANape establishes communication with the ECU , the DLT module sends information to CANape through the network transmission channel, and CANape visualizes and analyzes the received information. When users create a DLT Device in CANape, they do not need to add additional database information when selecting the Verbose mode, because the DLT message contains detailed description information, and the Log & Trace information content can be directly parsed. CANape can support setting the log and trace level, and send the information to the DLT module, which updates the transmitted Log & Trace information according to the set Filter .

Verbose DLT message format:

Non-Verbose Mode

In Non-Verbose mode (i.e. concise mode), the DLT module will not send metadata information, but only transmit non-static data information. Compared with Verbose mode, the amount of data on the bus is greatly reduced. When users create a Non-Verbose DLT Device in CANape, they need to add a database file (such as FIBEX). CANape associates the received data with the database file for parsing, recording, displaying, and merging and storing in the MDF file.

Non-Verbose DLT message format:

In this mode, the DLT message does not contain an extended header . Parsing the specific content of the Payload mainly relies on associating the Message ID in the Payload with the static data in the database, and then integrating and parsing it with the transmitted non-static data.

Measurement mode selection

When CANape creates a Device, you can select Verbose mode or Non-Verbose mode in the following locations.

Measurement data configuration

In Verbose mode, CANape can filter the type of diagnostic data that needs to be measured and recorded by setting the Log level, and supports Fatal/Error/Warn/Info/Debug/Block types for information selection and filtering.

In Non-Verbose mode, users can select the signals to be measured and recorded based on the database content , similar to the selection of general measurement signals.

Signal measurement analysis

CANape can display the DLT diagnostic information signals of the measurement record through the measurement window (such as Text Window/Graphic Window).

Figure: Verbose Mode Text Window

Figure: Non-Verbose Mode Graphic Window

Figure: Trace Window

Part.03

Summarize

The DLT module plays a vital role in the AUTOSAR standard, providing an effective solution for the diagnosis, debugging and troubleshooting of automotive electronic systems. CANape is a professional tool that integrates data acquisition and analysis, which can help users easily collect and analyze data and improve the efficiency of integrated testing.