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Chapter 5 AT Serial Hardware Installation, Verification, and Configuration
Serial Hardware and Software for Windows 5-24 ni.com
FIFO Enabled
You can use the FIFO Enabled control to enable or disable the
FIFO buffers on the serial port. FIFO buffers are present on the
16550-compatible UARTs—one for the transmitter and one for the
receiver.
FIFO Buffer Size
FIFO buffers are present on the 16550-compatible UARTs—one for the
transmitter and one for the receiver. The receiver FIFO trigger denotes the
number of characters received in the FIFO before the PC is interrupted to
read the data. The transmit FIFO trigger denotes the maximum number of
bytes written to the FIFO in a block when the PC is interrupted to write the
data. Consider the following points when selecting FIFO settings:
• You can select larger FIFO settings to reduce the number of interrupts
and therefore minimize system overhead.
• If transfer rates are high, you canlower receive FIFO settings to reduce
the number of interrupts and therefore prevent overrun errors due to
interrupt latency.
• If data transfer sizes are small, selecting receive FIFO settings just
above data sizes can reduce efficiency, so select lower settings.
Resources
ClickontheResources button to display the resource configuration dialog
box for the port. For more information on resource configuration, refer to
the next section, Resource Settings.
Resource Settings
The following sections explain the resource configuration options for each
serial interface.