HP IBASIC Supplement 2-11
Recording Programs
Operations That Do Not Record
instrument has completed a sweep, you must edit the program and
include a routine that waits for a status register to indicate the end of
the sweep.
CAUTION Synchronization is required only with overlapped commands.
Overlapped commands, such as the command to trigger a sweep, don't
hold off the processing of subsequent commands, and are not necessarily
completed when the next command begins. The analyzer adds a “wait”
command (*WAI) when an overlapped command is created using
keystroke recording. *WAI delays processing of subsequent commands
until previous commands have been parsed. *WAI does not insure
previous commands have completed. For more information on
synchronization, see “Synchronizing the Analyzer and a Controller” in
the Programmer's Guide.
Active Control of the GPIB Interface
Some operations require the analyzer to be the active controller on the
external GPIB bus. The analyzer must be the System Controller (or
active control must be passed to it from an external controller). When an
IBASIC program begins running, control of the external interface is
automatically passed to the program, so active control must be passed
back to the analyzer before these operations can be performed.
These operations include all of the following actions when they are
directed to GPIB devices.
•
•
NOTE Active control of the GPIB interface is only a problem if that bus is being
used. Hardcopy output to devices on the serial or parallel ports do not
require control of the GPIB.
The example program “PASSCTRL” in the Example Programs Guide and
on the Example Programs Disk illustrates these concepts.
You can use keystroke recording for any of these operations but you will
not be able to successfully run the program that is generated. You will
need to enter the program lines necessary to first pass control to the
analyzer and then wait for control to be passed back to the program.
See “Passing and Regaining Control” on page 8-16 for an example of
passing control to the analyzer.
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