4 Windows Virtual COM Driver
The same parameters may be pre-configured in the Device Manager. This is done via the
Properties
of the
NetCom Plus COM Port
. In the
Local Settings
tab these standard parameters are defined.
Since most programs configure these parameters by themselves, the values are very rarely used. A
typical situation is a serial printer attached to this virtual port.
4.4.2 Performance Issues
Operation through the network causes some extra time, which is approximately 5 Milliseconds. For
comparison, with a port internal to the computer this time may be just some 100 Microseconds.
This added time has an impact on reaction times. Some data protocols may be sensible. A lot
of configurations are possible to compensate for this. But these have an effect on the sheer data
throughput of the virtual serial port.
Figure 32: NetCom
+
COM Port Performance Settings
Consequently the configuration starts on the
Performance
tab. There are four already defined sets
of parameters.
Best Performance
is the default configuration. The driver software and the NetCom
+
communi-
cate with big data blocks. As a result a reaction on short events on the serial port is
somehow delayed. For applications operating with short data blocks, and waiting for
short answers this is not optimal. It causes transmission delays, called Latency.
September 2016
NetCom Plus User Manual
39
Summary of Contents for NetCom Plus 111
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