CRC
Cyclic Redundancy Check
CRD
An optional memory drive that resides on a memory card.
CS I/O
CVI
Campbell Scientific proprietary input/output port. Also, the proprietary serial com-
munications protocol that occurs over the CS I/O port.
Communication verification interval. The interval at which a PakBus® device verifies the
accessibility of neighbours in its neighbour list. If a neighbour 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 neighbour is removed from the neighbour list.
D
DAC
Digital to analogue conversion. The process that translates digital voltage levels to
analogue 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
datalogger support software. A binary file is created for each table in each datalogger.
These files mimic the storage areas in datalogger memory, and by default are two times
the size of the datalogger storage area. When the software collects data from a data-
logger, the data is stored in the binary file for that datalogger. Various software functions
Appendix A. Glossary 182
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