Campbell-scientific LoggerNet Datalogger Support Software Manual de usuario descargar pdf (Pagina 489)

Appendix A. Glossary of Terms

Modem – From “modulator-demodulator”; a device used to transmit and

receive digital data over normally analog communications lines, such as an

audio signal on telephone circuits. A modem attached to a computer performs

a digital-to-analog conversion of data and transmits them to another modem

that performs an analog-to-digital conversion which permits its attached

computer to use the data.

Net Description – Description of dataloggers and communications devices that

form the datalogger network. Created using the EZWizard in PC400 or Setup

Screen in LoggerNet to communicate with the various dataloggers.

Node – Part of the description of a datalogger network. Each node represents a

device that the communications server will dial through or communicate with

individually. Nodes are organized as a hierarchy with all nodes accessed by

the same device (parent node) entered as child nodes. A node can be both a

parent and a child node.

ObjSrlNo – This entry in the status table provides the revision number of the

datalogger PROM.

Output Interval – The output interval is the interval at which the datalogger

writes data to Final Storage. The output interval is defined by Instruction 84 in

Edlog (for table-based dataloggers) or the instructions that set the output flag

high in mixed-array dataloggers.

Output Processing – Writing to final storage memory a sample or summary

statistic of data measurements. Output processing options include sending a

sample, average, maximum, minimum, total, or wind vector of data to Final

Storage. Each Output Processing data value is kept in a separate location

within the datalogger. This allows multiple output processing for each

measurement. For example, you can average air temperature over a 60-second

interval, a one-hour interval, and a 24-hour interval. See the operator’s manual

or programming software for output processing options available for each

datalogger model.

Overrun Errors – Overrun errors occur when the actual program execution

time exceeds the execution interval. This causes program executions to be

skipped. When an overrun error occurs, the Table Overrun parameter in the

datalogger’s status table is incremented by 1.

Overruns – This entry in the status table provides the number of table

overruns that have occurred. A table overrun occurs when the datalogger has

insufficient time between execution intervals to complete one pass through the

program. This counter is incremented with each table overrun.

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Campbell-scientific LoggerNet Datalogger Support Software Manual de usuario Pagina 489