Campbell CR850, Operator'S Manual

Page: 126 / 566

Section 7. Installation
126
•
name of the CRBasic program running in the datalogger
•
name of the data table (limited to 20 characters)
•
alphanumeric field names to attach at the head of data columns
This information is referred to as "table definitions."
Table Typical Data Table
(p. 127)
shows a data file as it appears after the associated
data table has been downloaded from a CR800 programmed with the code in
CRBasic example
Definition and Use of a Data Table
(p. 127).
The data file
consists of five or more lines. Each line consists of one or more fields. The first
four lines constitute the file header. Subsequent lines contain data.
Note Discrete data files (TOB1, TOA5, XML) can also be written to CR800 CPU
memory using the TableFile() instruction.
The first header line is the Environment Line. It consists of eight fields, listed in
table
TOA5 Environment Line
(p. 126).
Table 12. TOA5 Environment Line
Field Description Changed via
1 file type (always TOA5) no change
2 station name DevConfig or CRBasic program
3 datalogger model no change
4 datalogger serial number no change
5 datalogger OS version send new OS
6 datalogger program name send new program
7 datalogger program signature send / change Program
8 table name change program
The second header line reports field names. This line consists of a set of comma-
delimited strings that identify the name of individual
fi elds as given in the
datalogger program. If the fi eld is an element of an array, the name will be
followed by a comma-separated list of subscripts within parentheses that
identifies the array index. For example, a variable named values that is declared as
a two-by-two array in the datalogger program will be represented by four
fi eld
names: values(1,1), values(1,2), values(2,1), and values(2,2). Scalar variables will
not have array subscripts. There will be one value on this line for each scalar
value de
fi ned by the table. Default field names are a combination of the variable
names (or alias) from which data are derived and a three-letter suffix. The suffix
is an abbreviation of the data process that output the data to storage. For example,
Avg is the abbreviation for average. If the default field names are not acceptable
to the programmer, FieldNames() instruction can be used to customize field
names. “TIMESTAMP”, “RECORD”, “Batt_Volt_Avg”, “PTemp_C_Avg”,
“TempC_Avg(1)”, and “TempC_Avg(2)” are default field names in table
Typical
Data Table
(p. 127).