Vaisala Hydromet Data Collection Platform - Manual (Page 317)

Chapter 5 __________________________________________ Configuring TCP/IP-Based Telemetry
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7. In the Equipment view, add a sensor and connect it to the virtual
COM port created for the sensor interface. This example uses a
ceilometer connected to DXE421 to provide the Ethernet
connection. See
Figure 154 on page 315 .
Sensors with an Ethernet interface are connected to virtual COM
ports. From the QML application point of view, such a sensor is the
same as it would be if connected to a serial port, except that instead
of a physical serial port, the connection is made to a virtual COM
port.
0710-119 Figure 154 Ceilometer Connected to Virtual COM Port
NOTE In this example, the QML logger is responsible for establishing the IP
connection to the sensor. In such a case, it is essential that the virtual
COM port is configured to open automatically (autostart) or that the
sensor is operated in polled mode. If autostart is not active and no data
is sent to the sensor port, no connection will be made.
If the virtual COM port for the sensor is not constantly kept open, the
poll timeout for the sensor may have to be increased to allow an
additional delay caused by opening the connection. Even more time
will be needed if the Ethernet module DSE101 has to be started and
parameterized.