Default Program - Campbell CR300 Series Product Manual

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installation-and-maintenance

20.1 Default program

Many data logger settings can be changed remotely over a communications link. This
convenience comes with the risk of inadvertently changing settings and disabling
communications. For example, external cellular modems are often controlled by a switched
12 VDC (SW12V) terminal. SW12V is normally off; so, if the program controlling SW12V is disabled,
such as by changing a setting or sending a new operating system, the cellular modem is switched
off and the remote data logger will not turn it on. This could require an on-site visit to correct the
problem unless a special program called default has been installed.
Having a default.CR300 program stored on the data logger will also ensure that a non-
compiling CRBasic program does not lock out a remote user.
NOTE:
The default program may use the extension .CR300,.CRB or .DLD.
When a file named default.CR300 is stored on the data logger CPU: drive, it is loaded if no
other program takes priority. Program execution priorities are as follows:
1. When the CR300 series powers up, a program file marked as Run On Power-up will run. If
that program includes a file specified by the Include File setting, it will be incorporated into
the program that runs.
2. If there is no program file marked Run Now or Run On Power-up (or if the program
selected to run cannot be compiled), the data logger will run the program specified by the
IncludeFile setting. For more information see IncludeFile (p. 215).
3. If the IncludeFile program cannot be compiled or if no program is specified, the data
logger will attempt to run the program named default.CR300 on its CPU: drive.
4. If there is no default.CR300 file or it cannot be compiled, the CR300 series will not
automatically run any program.
The default.CR300 program generally contains instructions to preserve critical datalogger
settings such as communications settings, but should not be more than a few lines of code.
'This program turns ON the
'power terminal, for 30 seconds every 60 seconds.
BeginProg
Scan(1,Sec,0,0)
at: http://www.campbellsci.com.au/videos/toolbox-for-
.
default.CR300
CRBasic Example 2:
SW12V switched
example
20. Installation 143