Data Translation DT300 Series, Руководство пользователя, Страница: 88 / 164

Chapter 6
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• Input FIFO Overflow – Indicates that the analog input data is not being transferred fast
enough from the Input FIFO across the PCI bus to the host computer. This error is
reported when the Input FIFO becomes full; the board cannot get access to the PCI bus
fast enough. The host computer can clear this error, but the error will continue to be
generated if the Input FIFO is still full. To avoid this error, close other applications that
may be running while you are acquiring data. If this has no effect, try using a computer
with a faster processor or reduce the sampling rate.
• Host Block Overflow – Indicates that the host computer is not handling data from the
board fast enough. This error is reported if the board completes the transfer of a block of
input data to the circular buffer in the host computer before the host computer has
finished reading the last block of data. The host computer can clear this error. To avoid
this error, ensure that you allocated at least three buffers at least as large as the sampling
rate; for example, if you are using a sampling rate of 100 kSamples/s (100 kHz), specify a
buffer size of 100,000 samples).
If any of these error conditions occurs, the board stops acquiring and transferring data to the
host computer.
Note: DT-Open Layers reports any of these errors as an overrun message.