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Graphics and Display Techniques
Using the Display Partitions
De-Allocating Display Partitions
To return the display partition to the analyzer for use as a measurement
screen, use the "DISP:PROG OFF" mnemonic. This should be done
before the termination of any program that has allocated a display
partition. It may also be required within the program to allow the user to
view instrument measurement data. The following example
demonstrates this command:
830
OUTPUT @Hp8711;"DISP:PROG OFF"
Operation with No Display Partition
IBASIC programs can also access the analyzer's display when no
partition has been allocated. This can be done through the use of certain
areas of the screen. One of these areas is the area reserved for softkey
labels. It is accessed using the ON KEY statement.
A second area is a display line (or command line) that appears when no
part of the display is allocated for use by IBASIC. This display line,
which is located at the lower left corner of the active measurement
channel graticule, appears when needed by the INPUT or DISP
commands or when activated. To activate the command line, press
on an external keyboard.
ESC
Figure 7-2 on page 7-6
shows an example of the use of this display line.
When the INPUT command is being used, the IBASIC editor's label
window and character entry softkey menu appear. Refer to
Chapter 5,
"Developing Programs,"
for a description of the IBASIC editor.
HP IBASIC Supplement
7-5
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