DTE
Data Terminal Equipment. While the term has much wider meaning, in the limited context of
practical use with the data logger, it denotes the pin configuration, gender, and function of
an RS-232 port. The RS-232 port on the data logger is DCE. Attachment of a null-modem
cable to a DCE device effectively converts it to a DTE device.
duplex
A serial communications protocol. Serial communications can be simplex, half-duplex, or
full-duplex.
duty cycle
The percentage of available time a feature is in an active state. For example, if the data
logger is programmed with 1 second scan interval, but the program completes after only 100
milliseconds, the program can be said to have a 10% duty cycle.
E
earth ground
A grounding rod or other suitable device that electrically ties a system or device to the earth.
Earth ground is a sink for electrical transients and possibly damaging potentials, such as
those produced by a nearby lightning strike. Earth ground is the preferred 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.
endian
The sequential order in which bytes are arranged into larger numerical values when stored in
memory.
engineering units
Units that explicitly describe phenomena, as opposed to, for example, the data logger base
analog-measurement unit of millivolts.
Appendix C. Glossary267
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