Appendix A. Glossary of Terms
E
Edlog – Campbell Scientific’s software application used to create new or edit
existing datalogger programs. Edlog supports all of the programming
capabilities in the dataloggers it supports. (Program generators such as Short
Cut are necessarily more limited in the features they can support.)
Edlog Datalogger – Any of the dataloggers, 21X, CR7, CR10, CR500,
CR10X, CR510, or CR23X. The default operating system for these
dataloggers is a mixed-array configuration. Some of these, specifically the last
three, can have alternative operating systems installed by users. These include
mixed-array, table-data (TD), or PakBus (PB) operating systems.
EEPROM – Electrically erasable programmable read only memory; the
memory CR10X-TD, CR510-TD, and CR23X-TD dataloggers use to store
their operating system. A new operating system can be transferred to the
datalogger using a special software package (see PROM and DevConfig).
Execution Interval – The periodic interval on which the datalogger program is
run. The execution interval is sometimes referred to as the Scan Interval. For
example, when an execution interval of 60 seconds is set, the datalogger will
execute its program table every 60 seconds. Between executions the
datalogger enters a sleep (quiescent) mode. This conserves battery power and
creates predictable measurement intervals. The execution interval is
synchronized with the datalogger’s real-time clock.
Execution Time – The time required to execute an instruction or group of
instructions. If the total execution time of a Program Table exceeds the table’s
Execution Interval, the Program Table will be executed less frequently than
programmed. Each time this occurs, a Table Overrun occurs. Table Overruns
are considered to be “errors” and are reported in the datalogger status
information table.
Excitation Channel – Sensors utilizing electrical bridge circuits require a
precise electrical voltage to be applied. The excitation channels, marked as E1,
E2, etc., on the datalogger wiring panel, provide this required precision
voltage.
F
Fault – Message relating to network activity where repeated problems or errors
have occurred. Repeated faults usually indicate a failure of some kind.
F1 – In most instances, pressing the F1 key will provide context sensitive help
for the highlighted object on the screen.
Final Storage – Final Storage is an area in the datalogger’s memory where
data is stored for collection to a PC. When you collect data from the
datalogger you are collecting data from a Final Storage area or table.
Flag – Memory locations where the program can store a logical high or low
value. These locations, called User Flags, are typically used to signal a state to
another part of the program.
A-4
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