NPort W2150/2250 Plus Series User’s Manual Installing and Configuring the Software
11-9
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.
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
Return error if network is unavailable: If this option is disabled, the driver will not return
any error even when a connection cannot be established to the NPort. With this option enabled,
calling the Win32 Comm function will result in the error return code
“STATUS_NETWORK_UNREACHABLE” when a connection cannot be established to the
NPort. This usually means that your host’s network connection is down, perhaps due to a
cable being disconnected. However, if you can reach other network devices, it may be that the
NPort is not powered on or is disconnected. Not that Auto Network Re-Connection must be
enabled in order to use this function.
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.
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