Campbell CR300 Series Product Manual page 232

IP trace
Function associated with IP data transmissions. IP trace information was originally
accessed through the CRBasic instruction IPTrace() and stored in a string variable. Files
Manager setting is now modified to allow for creation of a file in data logger memory.
isolation
Hardwire communication 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 communication signals to pass, but breaks alternate ground
paths and may filter some electromagnetic noise. Campbell Scientific offers optically isol-
ated RS-232 to CS I/O interfaces as an accessory for use on the CS I/O port.
J
JSON
Java Script Object Notation. A data file format available through the data logger or Log-
gerNet.
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 communication timeouts.
keyboard/display
The data logger has an optional external keyboard/display.
L
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 communication ports to another. It will not maintain a list
Appendix C. Glossary 219