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VIII. Recording a Log File
The Device allows recording measured sensor data values to the MicroSD card at regular intervals. This log
files can be used as an archive of voyage fluid levels historical data.
Create a file called YDTA.TXT with the following lines included:
LOG=ON
INTERVAL=5
where 5 is a time interval between the log records in minutes.
Insert the MicroSD card into the Device. The Device will produce three green LED flashes (refer to Section
IV.3) indicating that the configuration file has been processed.
The YDTAxxxx.TXT file (where xxxx – is a file number from 0001 to 9999) will be created in the root folder
of the MicroSD card. The Device will append a new data records to the file according to the configured
interval until the maximum file size is reached, in this case the next file will be created. After powering on,
the Device will seek for a file with the greatest file number and will continue to append data to it. When
the file with the last available file name (YDTA9999.TXT) is completely filled up with data, the logging
stops.
The log file size is four clusters; with a 32 KB cluster size (can be specified during the card formatting)
it will contain 2674 records (over nine days with 5 minutes logging interval).
Note that the logging configuration settings are saved in the non-volatile memory of the Adapter and will be
active even after the card is removed or when the NMEA 2000 network is powered off. Logging will restart
automatically when a MicroSD card is inserted allowing you to change a card on-the-fly.
Log files are ASCII-encoded text files with fixed line length. Each record contains 7 data fields with fixed
length divided by an ASCII «Space» character. Record example:
10.05.2016 05:43:23 OK #01 Level
where
37.7%, 754.1 L
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