User's Manual

NPort W2150A/W2250A Series Installing and Configuring the Software
5-15
Drop Writing Data if Network Connection is Lost: This function will assure the data to be kept in the
buffer or dropped when network connection is lost. The buffer size is 4 KBytes.
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.
Ignore TX Purge
Applications can use the Win32 API PurgeComm to clear the output buffer. Outstanding overlapping
write operations will be terminated. Select the Ignore TX Purge checkbox to ignore the effect on
output data.
4. On the Serial Parameters tab, specify the communication settings that the host will use when opening
the COM port.