NPort 5600-8-DT/DTL Series Using NPort Administrator
Tx Mode
Hi-Performance is the default for Tx mode. After the driver sends data to the NPort, the driver immediately
issues a “Tx Empty” response to the program. Under Classical mode, the driver will not send the “Tx Empty”
response until after confirmation is received from the NPort. This causes lower throughput. Classical mode is
recommended if you want to ensure that all data is sent out before further processing.
FIFO
When “FIFO” is disabled, the selected device port will send one by
te each time the Tx FIFO becomes empty, and
an Rx interrupt will be generated for each incoming byte. This will cause a faster response time but lower
throughput.
Network Timeout
“Network Timeout” specifies how long the driver will wait for the attached serial device to respond to an open,
close or serial parameter change operation. If a response is received by the specified time, the operation will
time out. The default value is 5000 milliseconds.
Fast Flush
“Fast Flush” is designed to improve response times for applications that use the Win32 PurgeComm() function.
When Fast Flush is enabled, the Real COM driver only flushes the local buffer on the host when it receives the
PurgeComm() function call. When disabled, applications that use PurgeComm() may perform markedly slower,
because the Real COM driver will need to also flush the remote buffer, which requires repeated queries of the
NPort to make sure no data is queued in the remote buffer. The repeated queries can cause a performance hit
due to the additional time spent communicating over the network, typically about several hundred milliseconds
when compared to COM ports. If your application uses PurgeComm() and performance seems sluggish, try
enabling Fast Flush.
In the Serial Parameters tab, the COM port’s serial communication parameters are defined.
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