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UltraPort Serial Adaptors User Guide
Installing under Windows 2000/XP/Server 2003/Vista/Server 2008
Page 42
Chapter 2 Installing drivers and host cards
In the FIFO Settings page, set the FIFO buffer levels using the parameters detailed in the
table.
.
Parameter Description
Tx FIFO Limit Sets the overall size of the Transmit FIFO buffer.You use this
when you want to restrict the size of the buffer in order to control
the data flow. This is useful when your application requires you
to send small amounts of data but needs acknowledgement
that the data has been sent.
For example, if your application is designed to receive 4 bytes
at a time, a larger value of say 16 would time out.
Permitted values for an UltraPort card are 1 to 64.
Tx FIFO Trigger Level Sets the level at which the com port Transmit FIFO buffer is
filled with data each time a request for more data is made.
For example, if set to 16 bytes you get 16 bytes at a time when
driver requests data.
Permitted values for an UltraPort card are 8, 16, 32 and 56.