CVI
Communications verification interval. The interval at which a PakBus® device verifies the
accessibility of neighbors in its neighbor list. If a neighbor does not communicate for a
period of time equal to 2.5 times the CVI, the device will send up to four Hellos. If no
response is received, the neighbor is removed from the neighbor list.
D
DAC
Digital to analog conversion. The process that translates digital voltage levels to analog
values.
data bits
Number of bits used to describe the data and fit between the start and stop bit. Sensors
typically use 7 or 8 data bits.
data cache
The data cache is a set of binary files kept on the hard disk of the computer running the data
logger support software. A binary file is created for each table in each data logger. These
files mimic the storage areas in data logger memory, and by default are two times the size of
the data logger storage area. When the software collects data from a data logger, the data is
stored in the binary file for that data logger. Various software functions retrieve data from
the data cache instead of the data logger directly. This allows the simultaneous sharing of
data among software functions.
data logger support software
LoggerNet, RTDAQ, and PC400 - these Campbell Scientific software applications include at
least the following functions: data logger communications, downloading programs, clock
setting, and retrieval of measurement data.
data output interval
The interval between each write of a record to a final-storage memory data table.
Appendix C. Glossary264
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