Perle Systems Adaptors - page 44

UltraPort Serial Adaptors User Guide
Installing under Windows 2000/XP/Server 2003/Vista/Server 2008
Page 44
Chapter 2 Installing drivers and host cards
10.Within the Serial Port properties window, click on the OK button to save changes and
close the window.
The configuration process is now complete.
Rx FIFO Trigger Level Sets the level at which the com port Receive FIFO buffer is filled
before the data is passed on to an application.
For example, if set to 16 bytes, 16 bytes of data are
accumulated at a time before data is passed on to an
application. The FIFO trigger will also time out if the level is not
achieved within two character periods of the last byte received.
Permitted values for an UltraPort card are 8, 16, 56 and 60.
High Flow Control
Threshold Sets the level at which data flow is suspended.
If the limit is exceeded, the driver will stop collecting data.
For UltraPort, value is read only, set automatically from FIFO
trigger level.
Low Flow Control
Threshold Sets the level at which data flow is resumed.
If the low flow threshold is exceeded, the driver requests more
data.
For UltraPort, value is read only, set automatically from FIFO
trigger level.
Hint
To restore the default settings, use the Restore Defaults button.
Parameter Description