Fail-Safe Data Recording
Fail-Safe Data Recording
Mobile recording of measurement data is subject to changing requirements:
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.
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.
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.
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.
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.
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 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.
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.
Data recording starts approximately 600 ms after “power on”. The logger stands out for its very low power consumption in stand-by mode.
A delay between ignition and the start of data recording can be specified.
With up to 12 CAN bus interfaces, freely configurable digital inputs and outputs, Wake-on-CAN, LAN, WLAN - When developing the UniCAN 3 data logger, numerous requirements from state-of-the-art vehicle development were taken into account.
The FPGA-/µ-controller- based CAN bus data loggers of the UniCAN 2 Professional family have features that are otherwise - if at all - only found in - PC-based devices. At the same time they offer unique data security.