isolation
Hardwire communications devices and cables can serve as alternate paths to earth ground
and entry points into the data logger for electromagnetic noise. Alternate paths to ground
and electromagnetic noise can cause measurement errors. Using opto-couplers in a
connecting device allows communications signals to pass, but breaks alternate ground
paths and may filter some electromagnetic noise.
J
JSON
Java Script Object Notation. A data file format available through the data logger or
LoggerNet.
K
keep memory
Keep memory is non-volatile memory that preserves some settings during a power-up or
program start up reset. Examples include PakBus address, station name, beacon intervals,
neighbor lists, routing table, and communications timeouts.
keyboard/display
The data logger has an optional external keyboard/display.
L
leaf
A PakBus node at the end of a branch. When in this mode, the data logger is not able to
forward packets from one of its communications ports to another. It will not maintain a list of
neighbors, but it still communicates with other PakBus data loggers and wireless sensors. It
cannot be used as a means of reaching (routing to) other data loggers.
leaf node
A PakBus node at the end of a branch. When in this mode, the data logger is not able to
forward packets from one of its communications ports to another. It will not maintain a list of
Appendix C. Glossary274
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