Campbell-scientific LoggerNet Datalogger Support Software Uživatelský manuál stáhnout pdf (Strana 345)

Section 8. Working with Data Files on the PC

Logical “and” and “or” statements can be used when specifying the Start

Condition. A logical “and” statement means that all conditions must be true

for the statement to be true. Up to three conditions can be connected with

“and” statements. If too many “and” statements are used, an error message will

be displayed when you run Split.

The logical “or” statement means that if any of the conditions are true, then the

statement is true. Split allows up to six conditions to be connected with “or”

statements. Additionally, each “or” statement can contain up to three “and”

conditions. As with the “and” statements, if the maximum number of valid

statements is exceeded, an error message will be displayed.

These rules for logical statements also apply to the Stop and Copy Conditions.

An example of a simple logical “and” statement follows:

2[189]and3[1200]

Element two (the Julian day) must equal 189, and element three (the time in

hours/minutes) must equal 1200.

If the following “and” statement was used:

2[189]and3[1200]and4[92]and5[67]

an error would be returned because the maximum number of allowable “and”

statements has been exceeded.

A range can be specified for val

by putting “..” between the lower and upper

limit. For example:

2[189]and7[200..275]

In this example two conditions must be satisfied to start processing data. First,

the day of year must be 189, and second, element 7 must be between 200 to

275 degrees, inclusive.

8.2.3.1.3.1 Starting Relative to PC Time

Split has the ability to start relative to the current PC TIME (computer time).

This feature allows a .PAR file to be run on new data files without changing

the Start Conditions, provided the Input Data File is collected at a fixed interval

and Split is run at a fixed interval. For example, the same PAR file could be

run every day to display the last 48 hours of data without changing the start

conditions. For example, using a table based data file:

Start Condition = 1:1[–1]:1[1200]:1:

In this instance, Split will begin processing data when the date for both files is

one less than the current date (1:1[–1]:1[1200]:1:)and the time is 1200 (1:1[–

1]:1[1200]:1:).

As an expanded example, assume that LoggerNet is used to append data to an

archive file. SplitR is executed using a desktop shortcut. In this case the

frequency of data collection and data reduction is the same. Time values in the

data file (day, hrmn, sec.) are different each time the data are collected, but by

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