Contec AI-1608AY-USB User Manual page 50

- Specified sampling data stored
This status is set to ON when input data stored in memory has reached the amount corresponding to
the preset number of times of sampling.
If the memory format is FIFO, the status is set to OFF when the amount of input data in the memory
falls below the value corresponding to the preset number of times of sampling as data is acquired.
Once the status is set to ON when the memory format is ring, it remains ON until it is reset.
- Overflow
An overflow error occurs when an attempt is made to store input data to memory while it has been
full of input data.
When the memory format is FIFO, the board stops conversion.
When the memory format is ring, the board continues conversion while overwriting existing data
with new one.
- Sampling clock error
This error occurs when the sampling clock period is too short.
- AD conversion error
If the "device operating" status remains ON (without terminating conversion) for an extended
period of time, the driver regards that state as an operation error and sets this status to ON. This
error stops sampling.
Sampling
Sampling
The number of sampled items of input data stored in memory can be obtained by the software command.
This command can only be used in device buffer mode.
Data acquisition
When using the device buffer, the conversion data stored in memory can be retrieved using a software
command.
The figure below shows the correspondence between the sampling count and the conversion channel for
the conversion data stored in memory.
Input data is acquired differently depending on the memory format used.
AI-1608AY-USB
6. Functions
45