Section 11. Glossary
Term: resistor
A device that provides a known quantity of resistance.
Term: resolution
A measure of the fineness of a measurement. See also Accuracy, Precision,
and Resolution
(p. 522).
Term: ring line
Ring line is pulled high by an external device to notify the CR800 to
commence RS-232 communications. Ring line is pin 3 of a DCE
(p. 496) RS-
232 port.
Term: ring memory
A memory configuration that allows the oldest data to be overwritten with the
newest data. This is the default setting for final-storage data tables.
Term: ringing
Oscillation of sensor output (voltage or current) that occurs when sensor
excitation causes parasitic capacitances and inductances to resonate.
Term: RMS
Root-mean square, or quadratic mean. A measure of the magnitude of wave
or other varying quantities around zero.
Term: router
Device configured as a router is able to forward PakBus packets from one
port to another. To perform its routing duties, a CR800 configured as a
router maintains its own list of neighbors and sends this list to other routers in
the PakBus network. It also obtains and receives neighbor lists from other
routers.
Term: RS-232
Recommended Standard 232. A loose standard defining how two computing
devices can communicate with each other. The implementation of RS-232 in
Campbell Scientific dataloggers to PC communications is quite rigid, but
transparent to most users. Features in the CR800 that implement RS-232
communication with smart sensors are flexible.
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