global navigation satellite system
A satellite navigation system with global coverage such as GPS (North America), Galileo
(Europe), and BeiDou (China).
global variable
A variable available for use throughout a CRBasic program. The term is usually used in
connection with subroutines, differentiating global variables (those declared using Public or
Dim) from local variables, which are declared in the Sub() and Function() instructions.
ground
Being or related to an electrical potential of 0 volts.
ground currents
Pulling power from the data logger wiring panel, as is done when using some
communications devices from other manufacturers, or a sensor that requires a lot of power,
can cause voltage potential differences between points in data logger circuitry that are
supposed to be at ground or 0 Volts. This difference in potentials can cause errors when
measuring single-ended analog voltages.
H
half-duplex
A serial communications protocol. Bi-directional, but not simultaneous, communications.
SDI-12 is a half-duplex protocol.
handshake
The exchange of predetermined information between two devices to assure each that it is
connected to the other.
hello exchange
In a PakBus network, this is the process of verifying a node as a neighbor.
Appendix C. Glossary271
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