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Can’t Open RLD File: Fewer Bytes Than Expected

Unable to open a *.RLD file and getting an error like this?

This means that the logger/iPack was unable to send the whole data file successfully and this partial file is incomplete and cannot be opened.
The logger/iPack will send the full data file next time it sends data. 

Another way to spot these incomplete files is to look at the size of the file. If the *.RLD file is less than the usual number of kb, then the file is incomplete. 

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40C Anemometer
BP20 Barometric Pressure Sensor
Windsensor P2546-OPR Anemometers
NRG Class 1 Anemometer
Thies First Class Advanced Anemometer

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