Contec AI-1204Z-PE, Справочное руководство

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Function
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AI-1204Z-PE Reference Manual
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Data Transfer Method
You can select between device buffer mode, which saves conversion data in a conversion data
memory area either on the device or in the driver, or user buffer mode which saves the conversion
data in application memory.
Device buffer mode
When conversion starts, data is saved in the device buffer (memory on the device itself or in the
driver).
The device buffer can operate as FIFO or RING memory.
The application calls a function at an appropriate timing and fetches the conversion data from the
device buffer. The device buffer mode provides function that allows the number of items of
conversion data using the number of sampling times as a unit to obtain the number of items of
conversion data directly from the voltage.
User buffer mode
A region of application memory to store the conversion data is reserved before starting conversion and
specified to the driver.
When conversion starts, conversion data is transferred via the driver directly to the application memory.
Whether or not to overwrite memory can be specified in user buffer mode.