Perle Systems 5500152-23 manual Parameter, Description, Rx FIFO Trigger Level, High Flow Control

Parameter	Description
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	Sets the level at which data flow is suspended.
Threshold	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	Sets the level at which data flow is resumed.
Threshold	If the low flow threshold is exceeded, the driver requests more
	data.
	For UltraPort, value is read only, set automatically from FIFO
	trigger level.

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.

Hint

To restore the default settings, use the Restore Defaults button.

UltraPort Serial Adaptors User Guide	Chapter 2 Installing drivers and host cards
Installing under Windows 2000/XP/Server 2003/Vista/Server 2008
Page 43