Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 326)

Section 8. Operation
326
8.3.4.1 File Attributes
A feature of program files is the file attribute. Table CR800 File Attributes
(p. 326)
lists available file attributes, their functions, and when attributes are typically
used. For example, a program file sent via the support software Program Send
command, runs a) immediately ("run now"), and b) when power is cycled on the
CR800 ("run on power-up'). This functionality is invoked because Program Send
sets two CR800 file attributes on the program file, i.e., Run Now and Run on
Power-up. When together, Run Now and Run on Power-up are tagged as Run
Always.
Note Activation of the run-on-power-up file can be prevented by holding down
the Del key on the external keyboard / display while the CR800 is powering up.
Table 75. CR800 File Attributes
Attribute Function Attribute for Programs Sent to CR800 with:
Run Always
(run on power-up +
run now)
Runs now and on
power-up.
a) Send (p. 431)
1
b) File Control
2
with Run Now & Run on Power-up
selected.
c) Campbell Scientific mass-storage media (USB:
drive) power-up
3 using commands 1 & 13 (see table
Powerup.ini Commands (p. 329) ).
Run on Power-up
Runs only on
power-up
a) File Control 2 with Run on Power-up checked.
b) Campbell Scientific mass-storage media (USB:
drive) power-up
3 using command 2 (see table
Powerup.ini Commands (p. 329) ).
Run Now
Runs only when
file sent to CR800
a) File Control 2 with Run Now checked.
b) Campbell Scientific mass-storage media (USB:
drive) power-up
3
using commands 6 & 14 (see
TABLE. Powerup.ini Commands (p. 329) ). However,
if Campbell Scientific mass-storage media (USB:
drive) is left in, program loads again from Campbell
Scientific mass-storage media (USB: drive).
1
Support software program Send (p. 431) command. See software Help.
2 Support software File Control (p. 431). See software Help & Preserving Data at Program Send (p.
110).
3
Automatic on power-up of CR800 with Campbell Scientific mass-storage media (USB: drive)
and Powerup.ini. See Power-up (p. 327).
8.3.4.2 Data Preservation
Associated with file attributes is the option to preserve data in CR800 memory
when a program is sent. This option applies to data table SRAM, and support
software cache data
(p. 426).
Depending on the application, retention of data files
when a program is downloaded may be desirable. When sending a program to the
CR800 with the support software Send command, data are always deleted before
the program runs. When the program is sent using support software File Control
Send
(p. 431)
command or CRBasic Editor Compile, Save and Send
(p. 428)
options
to preserve (not erase) or not preserve (erase) data are presented. The logic in
table Data-Preserve Options
(p. 327)
summarizes the disposition of CR800 data
depending on the data preservation option selected.