Campbell Scientific Open Path Eddy Covariance (OPEC) - Manual (Page 21)

OPEC Open-Path Eddy-Covariance System
4.1.1 Direct Connection Data Retrieval via LoggerNet
LoggerNet can be used to automatically collect and organize data from an
Open-Path Eddy-Covariance system. This approach is some what limited
because of the slow throughput into the PC’s RS-232 port. For all practical
purposes, the PC must remain continuously connected to the datalogger. It will
take about 8% to 25% of real time to collect 10 Hz time series data, e.g., it will
take between 5 to 15 minutes to download 60 minutes of 10 Hz time series
data. Using a PC and LoggerNet to “milk” data from remote sites is not
practical.
For sites where a PC is continuously connected to the datalogger via RS-232,
MD-485 short haul modems, Freewave spread spectrum radios, Ethernet
connection, or other “direct connection”, LoggerNet and the Baler can be used
to collect and manage the data.
To create a new station file see Section 4.2 of the LoggerNet manual.
Configure the station’s “Data Files” tab as shown in FIGURE 4-1 and FIGURE
4-2. Note that the “File Output Option” is “No Output File”. LoggerNet will
collect the data from the data table and place it in the cache. The cache is
where data collected from the datalogger is stored and made available for use
by client software, e.g., the Baler. Client software is run on the host PC or a
remote PC. For more information, see Section 13.1 of the LoggerNet manual.
FIGURE 4-1. LoggerNet station setup for the “flux” table
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