NPort 5100 Series User’s Manual
Configuring NPort Administrator
6-21
function, the NPort driver will keep querying the NPort’s firmware several times to make
sure there is really no data queued in the NPort firmware buffer, rather than just flushing
the local buffer. This kind of design is used because of some special considerations.
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 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 5100 is
powered on. However, the program can redefine the serial parameters to different values after
the program opens the port via Win 32 API.
Summary of Contents for NPort 5100 Series
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