Contec PC-HELPER Series Reference Manual page 52

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Function
AI-1204Z-PE Reference Manual
 Memory Format
You can select memory format by software.
FIFO format
In the FIFO (First In First Out) format, conversion data are read from memory in the same order in
which they were written to the memory. Conversion data are fed out of the memory sequentially,
where the oldest one is always read from the memory. The status monitor and application notification
functions are provided, which check and report the state in which the memory has stored a fixed
amount of data or in which the memory has become full.
The FIFO memory is used to obtain all conversion data from analog input in a short or infinite period
of time.
RING format
In the ring format, the memory contains storage areas arranged in a ring. Conversion data are written
to the memory sequentially. When it stores data exceeding the limit, it overwrites the area storing
the previous item of conversion data. The status monitor and application notification functions are
provided, which check and report the state in which data has been written to certain areas of
memory. The ring memory is used to obtain data where conversion has stopped due to some event,
usually without obtaining data in the normal state.
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