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5 Memory card
The data received from analog inputs and/or over RS485 interface is transferred to memory card in
two steps:
1. Data is stored in a standard data buffer (16 kB).
2. Data is transferred from the buffer to memory card with the period of 60 s or sooner if the buffer is
full.
The data is recorded in a log file created on the card one file per day (
NOTICE
Do not create new files or copy files from PC to the memory card to avoid damaging
the file structure of the memory card. However unnecessary files on the card can be
deleted.
5.1 Memory card replacement
Data transfer from the buffer to the card occurs once per minute and lasts 3-4 seconds. This process
is indicated by SD indicator flashing green (
Memory card should be removed from the logger during data accumulation in the data buffer
between two transfers. This interval is indicated by constant green light of SD indicator.
NOTICE
Do not remove the memory card when recording is not completed, in order to avoid
violation of the file structure on the card.
When the card is removed, the data continues to be stored in the standard buffer. After 1 minute or
when the standard buffer is full, the data is stored in an extra buffer (60 kB). This gives you an extra
30 seconds to remove the card.
NOTICE
Frequent use of the extra buffer is not recommended, this will wear out the memory
faster.
If the both buffers become full, but the new card is not yet inserted, some data may be lost. This is
indicated by a red flashing SD indicator.
5.2 Log file
Fig. 5.1 Log file
