User's Manual

NPort W2150A/W2250A Series Installing and Configuring the Software
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3. On the Advanced Setting tab, configure Tx Mode, FIFO, and Fast Flush.
Tx Mode: In Hi-Performance mode, the driver immediately issues a “Tx Empty” response to the
program after sending data to the NPort. In Classical mode, the driver sends the “Tx Empty” response
after confirmation is received from the NPort. Classical mode is recommended if you want to ensure that
all data is sent out before further processing.
FIFO: This tells the driver whether or not to use the FIFO.
Network Timeout: You can use this option to prevent blocking if the target NPort is unavailable.
Fast Flush: When enabled, the driver flushes only the local buffer on the host for a Win32
PurgeComm() function call. When disabled, both the local and remote buffers are flushed. If your
application uses PurgeComm() and performance seems sluggish, try enabling Fast Flush.
Auto Network Re-Connection: With this option enabled, the driver will repeatedly attempt to re-
establish the TCP connection if the NPort does not respond to background “check-alive” packets
Always Accept Open Requests: When enabled, the NPort driver will always accept requests to open a
virtual COM port, even if communications with the device can not be established. With this option, the
NPort driver will agree to open a virtual COM port on the system even if the port is blocked or the
Ethernet connection is disabled. If this is the case, the connected device will not receive and transmit
data even though the system has opened a virtual COM port.