Campbell-scientific LoggerNet Datalogger Support Software Bedienungsanleitung PDF herunterladen (Seite 440)

Section 11. Utilities Installed with LoggerNet Admin and LoggerNet Remote

11.3.5 Record Number Anomalies

Under certain circumstances it may appear there is a problem with the number

of records and their record numbers reflected by the Data Information table. It

is possible for the oldest record to have a record number higher than the newest

record. This is due to a combination of events.

Tables in dataloggers are configured as ring memory. Eventually, they will fill

and the oldest records will be overwritten with newer ones. The LoggerNet

data cache, too, is configured as ring memory, but sized to hold twice the

number of records that can be stored in the datalogger (default size). When the

datalogger compiles its program, it starts with record number 0; therefore, if

something causes the datalogger to recompile its program (such as sending a

program to the datalogger or using a keyboard display to alter the program

slightly) all of its tables will start with record number 0 again. Therefore, the

record numbers reflected in the Data Information table may appear to be

incorrect.

As an example, if the datalogger’s internal table size were 100 records,

LoggerNet’s cache would be sized at 200 records. If both had rung around and

LoggerNet’s cache now held record numbers 201–400 and someone re-sent the

same program to the datalogger, LoggerNet would not clear its data cache, but

would continue to store the new records. These record numbers, however,

would start at 0. After a short while as the new records were put into the data

cache and old ones overwritten, the earliest record in the data cache might be

251 while the newest record number might be 50. In the data file, however,

data would appear in correct sequence ordered by date/time stamps.

11.3.6 Communication Status

A box in the lower right corner of the Data Filer’s window provides an

indication of the Data Filer’s connection with the LoggerNet server. When the

Data Filer is in communication with the LoggerNet server, the box will appear

green and the IP address or computer name (e.g., LocalHost) will be displayed.

If communication with the server is lost (for instance, if LoggerNet is closed),

the box will appear red with the text “No Connection”. If communication is

lost but the Data Filer is attempting to reconnect, the box will appear blue with

the text “Attempting Connection”.

11.4 Data Export

The Data Export client provides a way to export the data collected by the

LoggerNet communications server to another computer program. In this role

the Data Export application acts as both a client and a server. It is a client to

the LoggerNet server and gets data from the LoggerNet data cache. It works as

a server to provide data to customer supplied client applications.

11.4.1 Functional Overview

The data to export is specified by selecting tables from each of the stations in

the datalogger network. When a data table is selected for export, every record

that the server collects from the datalogger for that table is sent out by Data

Export. If a table is selected but for some reason there is no data being

collected by the server, no data will be sent.

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