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Chapter 3 PXI Serial Hardware Installation, Verification, and Configuration
Serial Hardware and Software for Windows 3-22 ni.com
FIFO Buffer Size
The Receive FIFO size control sets the number of characters received in
the FIFO before the PC is interrupted to read the data. The Transmit FIFO
size control sets the maximum number of bytes written to the FIFO in a
block when the PC is interrupted to write the data. When you configure
FIFO settings, consider the following points:
• You can select larger FIFO buffer sizes to reduce the number of
interrupts your PC receives and therefore minimize system overhead.
• If transfer rates are high, you can lower the Receive FIFO size value
to prevent overrun errors due to interrupt latency.
• If your data transfer sizes are small and your Receive FIFO size value
is above your data sizes, your system is less efficient. Therefore, set the
Receive FIFO size value below your data sizes.
Resources
To view the resource configuration dialog box for the selected port, click
on the Resources button. You cannot change these resources; they are
automatically assigned.