Campbell Scientific CR9000X Measurement and Control System - Manual (Page 78)

Section 2. Data Storage and Retrieval
2.3.1.1 Collect Mode
The Collect Mode allows the user to select what data records to collect.
The most common Collect Modes are to collect All the Data and/or Data
Since Last collection. The other options require more knowledge of the
data set that is being stored.
All the Data –
Collects the entire table stored in the CR9000X. RTDAQ gets the
current record number from the table in the CR9000X and then
retrieves the oldest record in the table up to the current record
number.
Data Since Last Collection –
Select this option to only collect new data that was recorded since
the last time that data was collected from this Table using this
RTDAQ Station. RTDAQ has tracking pointers that stores the
last record number collected, and will collect, starting from the
next sequential record, up to the current record.
Data from Selected Data and Time –
Allows you to specify a time frame for data collection. When this
option is selected, the Starting Date/Time and Ending Date/Time
fields will be enabled.
Newest Number of Records –
If a specific number of the most recent records is desired, select
this option and enter the number of most recent records desired to
retrieve into the Number of Records box.
Specific Records –
Select this option if a number of records, starting with a specified
record number, is desired. Enter the Starting Record number
and the Number of Records to collect.
2.3.1.2 File Mode
The File Mode options allow the user to select how he wants to manage the
file in which the data is collected to.
Create New File –
Leaves any existing files intact and creates a new file whose
default filename will include the date and time of file creation.
(The new filename will be the specified filename with
_yyyy_mm_dd_hh_mm_ss appended to the end. For example, a
file created on Jan 27, 2007 at 4:04:15 PM with a specified
filename of CR1000_FFT.dat will be created as
CR10000_FFT_2007_01_27_16_04_15.dat.)
Append to End of File –
Adds new data to the end of the existing data file. If the header of
the existing data file does not match the collected data (for
example, a field has been added to the table) or if a different file
format is specified, the existing data file will be backed up to
filename.backup. Only the currently collected data will be
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