Campbell Scientific CR200/CR200X-series Dataloggers - Manual (Page 82)

Section 9. Programming
in the LoggerNet / PC400 datalogger support software suites. Programs can be
up to 19.6 KBytes in size although typical programs are smaller.
9.3.1 Short Cut Editor and Program Generator
Short Cut is easy-to-use menu-driven software that presents the user with lists of
predefined measurement, processing, and control algorithms from which to
choose. The user makes choices and Short Cut writes the CRBASIC code
required to perform the tasks. Short Cut creates a wiring diagram to simplify
connection of sensors and external devices. Quickstart Tutorial (p. 3) works
through a measurement example using Short Cut.
For many complex applications, Short Cut is still a good place to start. When as
much information as possible is entered, Short Cut will create a program
template from which to work, already formatted with most of the proper
structure, measurement routines, and variables. The program can then be edited
further using CRBASIC Program Editor.
9.3.2 CRBASIC Editor
CR200(X) application programs are written in a variation of BASIC (Beginner's
All-purpose Symbolic Instruction Code) computer language, CRBASIC
(Campbell Recorder BASIC). CRBASIC Editor is a text editor that facilitates
creation and modification of the ASCII text file that constitutes the CR200(X)
application program. CRBASIC Editor is available as part of LoggerNet /
PC400 / RTDAQ datalogger support software packages.
Fundamental elements of CRBASIC include:
• Variables - named packets of CR200(X) memory into which are stored
values that normally vary during program execution. Values are typically
the result of measurements and processing. Variables are given an
alphanumeric name and can be dimensioned into arrays of related data.
• Constants - discrete packets of CR200(X) memory into which are stored
specific values that do not vary during program executions. Constants are
given alphanumeric names and assigned values at the beginning
declarations of a CRBASIC program.
Note Keywords and predefined constants are reserved for internal CR200(X)
use. If a user programmed variable happens to be a keyword or predefined
constant, a runtime or compile error will occur. To correct the error, simply
change the variable name by adding or deleting one or more letters, numbers, or
the underscore (_) from the variable name, then recompile and resend the
program. CRBASIC Help provides a list of keywords and pre-defined constants.
• Common instructions - Instructions and operators used in most BASIC
languages, including program control statements, and logic and
mathematical operators.
• Special instructions - Instructions unique to CRBASIC, including
measurement instructions that access measurement channels, and
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