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NE-4100 Series User’s Manual Network Enabler Administrator
7-20
Advanced Settings
In the Advanced Settings tab, you may configure how serial data is transmitted over the network.
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.