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 44

 

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Image 44
Perle Systems Adaptors manual Parameter Description Rx Fifo Trigger Level, High Flow Control, Threshold, Low Flow Control