Appendix A. Glossary of Terms
D
Data Advise (Datalogger) – A mutual agreement between the communication
server and the datalogger about which tables are to be collected every time the
datalogger is contacted. Based on the dataloggers table definitions.
Data Advise (Server) – an agreement between a client application and the
communication server to provide specified data as it is collected by the server.
Data Advise Notification – The packet of data sent by the datalogger based on
the Data Advise agreement.
Data Cache – The storage for data collected from the datalogger by the
communication server. This data is stored in binary files on the hard disk of
the computer where the server is running.
Data Collection – Getting a copy of the data stored in the datalogger and
saving it in the communication server’s data cache (compare to Data
Retrieval).
Data Point – A data value that is sent to Final Storage as the result of an
Output Instruction. A group of data points output at the same time makes up a
record in a data table.
Data Retrieval – Sending a copy of the data from the communication server’s
data cache to a file, network, or data display (compare to Data Collection).
Data Storage Table, Data Table – A portion of the datalogger’s Final Storage
allocated for a particular output. Each time output for a given data table
occurs, a new record is written to the table. The size of the table (in number of
records) and when records are written to the data table are determined by the
datalogger’s Data Table Instruction (P84). The fields (columns) of the table
are determined by the Output Processing Instructions that follow the Data
Table Instruction.
Data Table Instruction – Instruction 84. Used to create a Data Table and to
cause records to be written to the Data Table.
DaysFull – A field in the status table that shows the number of days before any
of the tables using automatic record allocation are filled.
DevConfig – Short for “Device Configuration Utility”, a software application
that provides a graphical user interface to configure settings in dataloggers and
communications peripherals. Available in PC400, LoggerNet, and as a stand-
alone application from the Campbell Scientific website. (Supplants
CSOS.EXE, PakCom, and stand-alone terminal emulators.)
Differential Analog Input – Some sensors have two signal wires and the
measurement is reflected in the voltage difference between them. This type of
sensor requires two analog connections. The channels marked DIFF on the
datalogger wiring panel are used to connect differential sensors.
DLD File – An ASCII file that can be sent to program an Edlog datalogger.
Dataloggers must be programmed to perform measurements, convert data to
final units, and to save data for retrieval. Edlog is used to create these files that
are saved to disk with a DLD file name extension. A program must be sent to
the datalogger before the datalogger will begin to collect data.
A-3
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