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Fail-Safe Data Recording Fail-Safe Data Recording

UniCAN Data Logger

Optimized for mobile applications

Mobile recording of measurement data is subject to changing requirements:

  • no data loss
  • encrypted data transmission
  • data transmission during recording
  • permanent access to data
  • transmission paths adapted to the country and situation
  • recording of CAN signals and messages
  • fast start of recording

The UniCAN data loggers from CSM offer a solution for all these requirements. Despite their compact size, the microcontroller-based devices are very powerful. The CSM proprietary file system used for data recording to CF card is optimized for storage rate and data security.

System Features

Quick start-up

Data recording starts approximately 600 ms after “power on”. The logger stands out for its very low power consumption in stand-by mode.

Start delay

A delay between ignition and the start of data recording can be specified.

Data recording

Fail-safe data acquisition

The firmware detects power supply cuts and the removal of the CF card during data recording. No data recorded up to this time will be lost. Data recording is resumed automatically as soon as the card is re-inserted and the power supply restored.

Optimized memory access to CF cards

In contrast to data loggers with standard file systems, the write access of a UniCAN logger to a memory card is not affected by the increased segmentation of the memory device. The data is compressed during recording.

Simultaneous acquisition

CAN messages and signals, each up to a maximum of eight separate groups, can be recorded in parallel. Each group has individual trigger and filter criteria and can be used as linear or ring buffers.

Trigger and filter criteria

Wide trigger criteria and pre- and post-trigger ranges can be defined per channel/message group. As the capacity of the CF card is the only limit to the size of a pre-trigger, the occurrence of a trigger event can practically contain any amount of trigger data.

Data transmission and live-access

Fleet management and live data via MQTT

MQTT (Message Queing Telemetry Transport) can be used to display real-time information on the operating status of the logger and selected measurement channels remotely. The live data is transmitted via modem or WLAN.

This facilitates the management of vehicle fleets, as errors or deviations can be detected quickly. Status information of the devices (e.g. card fill level and position data) and selected measurement channels are displayed. The individual configuration allows the information relevant to the application to be selected.

Data security is ensured by user authentication and data encryption using the TLS protocol.


Note: The MQTT broker and the setup of the dashboard are not part of CSM's scope of services. The setup must be carried out by the user or a service provider.

Data integrity and data security

If the internet is used for data transmission, data integrity can be ensured by using the ftp command XCRC. SSH2 provides protection against data theft and data corruption.

Data transmission modes

The data transmission mode can be used to determine when the data logger should transmit data. Data can be transmitted when the ignition is switched on and off or periodically.

Easy verification of configuration and data recording (via USB)

Important status information and measurement data can be displayed live via "Live Monitoring" to check configuration and data recording. This makes commissioning much easier. The following information is displayed: Status of the logger (e. g. measurement status, error status, firmware, temperature, position data), status of the measurement (e. g. measurement duration, data quantity), status of the triggers and conditions, system signals, status of the channel groups and message groups as well as current measured values of the configured channels.

Remote data transmission

Data can be transmitted via mobile communications modem while data recording continues without interruption. Measurement data can be read remotely via modem/(S)FTP server (data formats are, for example, MDF or ASCII). For maximum data security, the data transmission is binary.

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