Campbell Scientific LoggerNet Datalogger Support Software User Manual
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Appendix A. Glossary of Terms
RTMS – Real-Time Monitoring Software. A software application designed by
Campbell Scientific for fast real-time data acquisition. RTMS included both
communications and graphical display features and was designed for IBM’s
OS/2 PC operating system and replaced by LoggerNet, RTMC and RTDM.
S
Scan Interval – See Execution Interval.
SDI-12 – SDI-12 stands for Serial Digital Interface at 1200 baud. It is an
electrical interface standard and communications protocol that was originally
developed by Campbell Scientific and other manufacturers for the U.S.
Geological Survey for hydrologic and environmental sensors. SDI-12 was
designed to be a simple interface (ground, 12 volts, and signal) that improves
compatibility between dataloggers and “smart” microprocessor-based sensors.
Other goals of the SDI-12 standard are:
•
low power consumption for battery powered operation via the datalogger
•
low system cost
•
use of multiple sensors on one cable connected to one datalogger
•
allow up to 200 feet of cable between a sensor and a datalogger
Security Code – A code entered into the datalogger either directly with a
keypad or via the datalogger’s program to prevent unauthorized access to
datalogger settings, programs, and data.
Server – Also “communication server”, a software application that accepts
connections from client applications and provides data or other information as
requested. The LoggerNet server manages all the communications and data
collection for a network of dataloggers. The collected data is made available
for client applications. PC200W and PC400 also use the communication server
but in a more limited configuration.
Short Cut – A program generator application that ships with PC400,
LoggerNet, and is available as a stand-alone product from the Campbell
Scientific website. Short Cut does not require knowledge of individual
program instructions. Users need only know what kind of datalogger and
sensors they’re using and decide what output they require. Short Cut generates
the program for them. (Contrast a “program generator” with the full-featured
“program editors”, Edlog and CRBasic Editor.)
Signature – Number calculated to verify both sequence and validity of bytes
within a packet or block of memory.
Single-ended Analog Input – Some analog sensors have only one signal wire.
(They will also have another wire that can be grounded and that is used as the
reference for the signal wire.) With this type of sensor, only one analog
connection is required. Hence, it needs a “single-ended” or SE analog input.
The single ended channels are marked as SE on the datalogger wiring panel.
Station – A datalogger site is often referred to as a station.
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