About data tables

A data table is essentially a file that resides in data logger memory (for information on data table storage. See Data memory. The file consists of five or more rows. Each row consists of columns, or fields. The first four rows constitute the file header. Subsequent rows contain data records. Data tables may store individual measurements, individual calculated values, or summary data such as averages, maximums, or minimums.

Typically, files are written to based on time or event. The number of data tables is limited to 250, which includes the Public, Status, DataTableInfo, and ConstTable. You can retrieve data based on a schedule or by manually choosing to collect data using data logger support software. See Collecting data.

Example data
TOA5, MyStation, CR1000X, 1142, CR1000X.Std.01, CPU:MyTemperature.CR1X, 1958, OneMin
TIMESTAMP	RECORD	BattV_Avg	PTemp_C_Avg	Temp_C_Avg
TS	RN	Volts	Deg C	Deg C
		Avg	Avg	Avg
2019-03-08 14:24:00	0	13.68	21.84	20.71
2019-03-08 14:25:00	1	13.65	21.84	20.63
2019-03-08 14:26:00	2	13.66	21.84	20.63
2019-03-08 14:27:00	3	13.58	21.85	20.62
2019-03-08 14:28:00	4	13.64	21.85	20.52
2019-03-08 14:29:00	5	13.65	21.85	20.64

Table definitions

Each data table is associated with descriptive information, referred to as a“table definition,” that becomes part of the file header (first few lines of the file) when data is downloaded to a computer. Table definitions include the data logger type and OS The operating system (also known as "firmware") is a set of instructions that controls the basic functions of the data logger and enables the use of user written CRBasic programs. The operating system is preloaded into the data logger at the factory but can be re-loaded or upgraded by you using Device Configuration Utility software. The most recent data logger operating system .obj file is available at www.campbellsci.com/downloads. version, name of the CRBasic program associated with the data, name of the data table (limited to 20 characters), and alphanumeric field names.

Header rows

The first header row of the data table is the environment line, which consists of eight fields. The following list describes the fields using the previous table entries as an example:

• TOA5 Also called ASCII, Long Header. Data stored in a comma separated format. Header information for each column is included, along with field names and units of measure if they are available. Table output ascii version 5. - Table output format. Changed via LoggerNet Campbell Scientific's data logger support software for programming, communications, and data retrieval between data loggers and a computer. Setup Standard View, Data Files tab. Other formats include: TOB1 Binary. Data stored in a binary format. Though this format saves disk storage space, it must be converted before it is usable in other programs. Table output binary version 1. and TOACI1 Also called ASCII, Short Header. Data stored in a comma separated format. Header information for each of the columns is included. Table output ASCII version 1..
• MyStation - Station name. Changed via LoggerNet Setup, Device Configuration Utility Software tool used to set up data loggers and peripherals, and to configure PakBus settings before those devices are deployed in the field and/or added to networks., or CRBasic Campbell Scientific's BASIC-like programming language that supports analog and digital measurements, data processing and analysis routines, hardware control, and many communications protocols. program.
• CR1000X - Data logger model.
• 1142 - Data logger serial number.
• CR1000X.Std.01 - Data logger OS version.
• CPU:MyTemperature.CR1X - Data logger program name. Changed by sending a new program (see Sending a program to the data logger for more information).
• 1958 - Data logger program signature. Changed by revising a program or sending a new program (see Sending a program to the data logger for more information).
• OneMin - Table name as declared in the running program (see Creating data tables in a program for more information).

The second header row reports field names. Default field names are a combination of the variable names (or alias A second name assigned to variable in CRBasic.es) from which data is derived, and a three-letter suffix. The suffix is an abbreviation of the data process that outputs the data to storage. A list of these abbreviations follows in Data processing abbreviations.

If a field is an element of an array A group of variables as declared in CRBasic., the field name will be followed by a indices within parentheses that identify the element in the array. For example, a variable named Values, which is declared as a two-by-two array in the data logger program, will be represented by four field names: Values(1,1), Values(1,2), Values(2,1), and Values(2,2). There will be one value in the second header row for each scalar value defined by the table.

If the default field names are not acceptable to the programmer, the FieldNames() instruction can be used in the CRBasic Campbell Scientific's BASIC-like programming language that supports analog and digital measurements, data processing and analysis routines, hardware control, and many communications protocols. program to customize the names. TIMESTAMP, RECORD, BattV_Avg, PTemp_C_Avg, and Temp_C_Avg are the default field names in the previous Example data.

The third header row identifies engineering units for that field. These units are declared at the beginning of a CRBasic Campbell Scientific's BASIC-like programming language that supports analog and digital measurements, data processing and analysis routines, hardware control, and many communications protocols. program using the optional Units() declaration. In Short Cut A CRBasic programming wizard suitable for many data logger applications. Knowledge of CRBasic is not required to use Short Cut., units are chosen when sensors or measurements are added. Units are strictly for documentation. The data logger does not make use of declared units, nor does it check their accuracy.

The fourth header row reports abbreviations of the data process used to produce the field of data.

Data processing abbreviations
Data processing name	Abbreviation
Totalize	Tot
Average	Avg
Maximum	Max
Minimum	Min
Sample at Max or Min	SMM
Standard Deviation	Std
Moment	MMT
Sample	No abbreviation
Histogram1	Hst
Histogram4D	H4D
FFT	FFT
Covariance	Cov
Level Crossing	LCr
WindVector	WVc
Median	Med
ET	ETsz
Solar Radiation (from ET)	RSo
Time of Max	TMx
Time of Min	TMn

Data records

Subsequent rows are called data records. They include observed data and associated record keeping. The first field is a time stamp (TS), and the second field is the record number (RN).

The time stamp shown represents the time at the beginning of the scan in which the data is written. Therefore, in record number 3 in the previous Example data, Temp_C_Avg shows the average of the measurements taken over the minute beginning at 14:26:01 and ending at 14:27:00. As another example, consider rainfall measured every second with a daily total rainfall recorded in a data table written at midnight. The record time stamped 2019-03-08 00:00:00 will contain the total rainfall beginning at 2019-03-07 00:00:01 and ending at 2019-03-08 00:00:00.