Campbell CR800 Series - Page 518

Section 11. Glossary
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Term: Telnet
A software utility that attempts to contact and interrogate another specific
device in a network. Telnet is resident in Windows OSs.
Term: terminal
Point at which a wire (or wires) connects to a wiring panel or connector.
Wires are usually secured in terminals by screw- or lever-and-spring actuated
gates. with small screw- or spring-loaded clamps. See connector
(p. 493).
Term: terminal emulator
A command-line shell that facilitates the issuance of low-level commands to
a datalogger or some other compatible device. A terminal emulator is
available in most datalogger support software
(p. 86) available from Campbell
Scientific.
Term: thermistor
A thermistor is a temperature measurement device with a resistive element
that changes in resistance with temperature. The change is wide, stable, and
well characterized. The output of a thermistor is usually non-linear, so
measurement requires linearization by means of a Steinhart-Hart or
polynomial equation. CRBasic instructions Therm107(), Therm108(), and
Therm109() use Steinhart-Hart equations.
Term: time domain
Time domain describes data graphed on an X-Y plot with time on the X axis.
Time series data are in the time domain.
Term: throughput rate
Rate that a measurement can be taken, scaled to engineering units, and the
stored in a final-memory data table. The CR800 has the ability to scan
sensors at a rate exceeding the throughput rate. The primary factor
determining throughput rate is the processing programmed into the CRBasic
program. In sequential-mode operation, all processing called for by an
instruction must be completed before moving on to the next instruction.
Term: TTL
Transistor-to-Transistor Logic. A serial protocol using 0 Vdc and 5 Vdc as
logic signal levels.