NE-4100 Series User’s Manual
Network Enabler Administrator
7-19
When Tx Mode is set to
Hi-Performance
, the Real COM driver sends a “Tx Empty” signal to the
host as soon as it sends serial data over the network to the selected module. In Hi-performance
mode, the driver will not verify that the module has successfully received and passed the data to
the serial device. When Tx Mode is set to
Classical
, the driver sends the “Tx Empty” signal only
after the module has confirmed that serial data has been successfully passed on to the serial device.
The additional step of verification, plus the fact that it must be transmitted over the network,
means that Classical mode will cause lower throughput. If you want to ensure that all data is sent
out before further processing, Classical mode is recommended.
When
FIFO
is disabled, the selected module will send one byte each time the Tx FIFO becomes
empty, and an Rx interrupt will be generated for each incoming byte. This will cause a faster
response time but lower throughput. If you want to use XON/XOFF flow control, we recommend
setting FIFO to Disable.
Fast Flush
is designed to improve response time for applications that use the Win32
“PurgeComm()” function. When Fast Flush is enabled, the Real COM driver automatically flushes
the buffer when it receives the “PurgeComm()” function call. When disabled, applications that use
the Win32 “PurgeComm()” function may perform markedly slower, because the Real COM driver
will repeatedly query the module to make sure no data is queued in the buffer instead of just
flushing the buffer. The repeated queries can cause a performance hit due to the additional time
spent communicating over the network, typically about several hundred milliseconds when
compared to local COM ports (physically on the PC). If your application uses PurgeComm() and
performance seems sluggish, try enabling Fast Flush.
Serial Parameters
In the
Serial Parameters
tab, you may configure the selected module’s baud rate, parity, data bits,
stop bits, and flow control. The parameters shown below are the default settings.
Enable and Disable
Enable
and
Disable
are used to activate or deactivate the selected module’s COM mapping
settings. Note that this menu may also be opened by right-clicking
COM Mapping
in the
navigation panel or by right-clicking the desired module. COM port mappings may be individually
enabled or disabled.
Once a module’s COM mappings have been enabled, the Real COM driver will operate
independently of Network Enabler Administrator. The mappings will be active whether or not
Network Enabler Administrator is open.
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