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CAN logging Example 3 - On Change Logging

On receipt of CAN messages whose content seldom changes, you can activate the VALID ON CHANGE option.

If the option is activated, a CAN message received is only recorded by the device if a value within the data bytes has changed.

This option can be activated for standard 11-bit and 29-bit CAN messages as well as for J1939 CAN messages.

High data volume

If the VALID ON CHANGE option is activated, the DOWN-SAMPLE option is automatically deactivated and no longer limits the frequency of recording. Each CAN message received with a modified content will be recorded by the device. This leads to high data volumes in the case of CAN messages whose content changes in the millisecond range.

  • Only activate the VALID ON CHANGE option for carefully selected messages.

  1. Navigate to the COMMUNICATION section.

  2. Move to the STANDARD CHANNEL section and click to enable the VALID ON CHANGE option.

  3. Navigate to the LOGGING section.

  4. Move to the LOGGING section and click to tick the LOGGING ENABLED option.

    ✓ CAN messages received with a modified content are recorded.