Campbell Scientific CR9000X Measurement and Control System - Manual (Page 423)

Appendix E. Glossary
DevConfig Device Configuration Utility, available with LN, PC400, or from
the CSI website.
DHCP Dynamic Host Configuration Protocol. A TCP/IP application protocol.
differential a sensor or measurement terminal wherein the analog voltage
signal is carried on two leads. The phenomenon measured is proportional
to the difference in voltage between the two leads.
digital numerically presented data.
Dim a CRBASIC command for declaring and dimensioning variables.
Variables declared with DIM remain hidden during datalogger operation.
dimension to code for a variable array. DIM example(3) creates the three
variables example(1), example(2), and example(3). DIM example(3,3)
creates nine variables. DIM example (3,3,3) creates 27 variables.
DNS Domain Name System. A TCP/IP application protocol.
DTE data terminal equipment. While the term has much wider meaning, in
the limited context of practical use with the CR1000, it denotes the pin
configuration, gender and function of an RS-232 port. The RS-232 port
on the CR1000 and on many 3
rd party telecommunications devices, such
as a digital cellular modems, are DCE. Attachment of a null-modem
cable to a DCE device effectively converts it to a DTE device.
Earth Ground1) Using a grounding rod or another suitable device to tie a
system or device to the earth at the datalogger site. Such a connection is
used as a sink for electrical transients and possibly damaging potentials,
such as those produced by a nearby lightning strike. 2) A reference
potential for analog voltage measurements. Note that most objects have a
“an electrical potential” and the potential at different places on the earth –
even a few meters away – may be different. See ground loop.
engineering units units that explicitly describe phenomena, as opposed to the
CR1000 measurement units of millivolts or counts.
ESD electrostatic discharge
ESS Environmental Sensor Station
excitation application of a precise voltage, usually to a resistive bridge circuit.
execution time time required to execute an instruction or group of instructions.
If the execution time of a Program Table exceeds the table's Execution
Interval, the Program Table is executed less frequently than programmed
(Section OV4.3.1 and 8.9).
expression a series of words, operators, or numbers that produce a value or
result.
File Control a feature of LoggerNetTM / PC400 / RTDAQ / PC200W
software used in management of files that reside in CR1000 memory.
Fill-and-Stop Memory a memory configuration for data tables forcing a data
table to stop accepting data when full.
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