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NPort 5400 Series User’s Manual Configuring NPort Administrator
6-24
However, it might take more time (on the order of several hundred milliseconds) than a
native COM1, because it needs to work via Ethernet. That’s why the native COM ports
on the motherboard can work fast with this function call, but the NPort requires much
more time. In order to accommodate other applications that require a faster response time,
the new NPort driver implements a new “Fast Flush” option. Note that by default, this
function is disabled.
• To begin with, make sure there are some “PurgeComm()” functions being used in your
application program. In this kind of situation, you might find that your NPort exhibits a
much poorer operation performance than when using the native COM1 port. Once you
have enabled the “Fast Flush” function, you can check to see if there has been an
improvement in performance.
• By default, the optional “Fast Flush” function is disabled. If you would like to enable this
function, from the “NPort Administrator,” double click on the COM ports that are
mapped to the NPort, and then select the “Fast Flush” checkbox. You should find that
when “Fast Flush” is enabled, the NPort driver will work faster with “PurgeComm().”
8. The Serial Parameter settings shown here are the default settings when the NPort 5400 is
powered on. However, the program can redefine the serial parameters to different values after
the program opens the port via Win 32 API.