HP 8921A Programmer's Manual page 324

Chapter 5, Advanced Operations
Passing Control
324
Passing Control Between an External Controller and the Test Set with an IBASIC
Program Running
The following example program illustrates the passing of control between an
external Controller and the Test Set while an IBASIC program is running in the
Test Set. The example is based upon having an HP 9000 Series 300 Workstation
as the external controller connected to the Test Set through the HP-IB bus.
Further, it is based on the assumption that the HP-IB interface in the HP 9000
Controller is set to the default select code of 7 and address of 21. In this example,
the Test Set is NOT configured as the System Controller. This example illustrates
the situation where the External Controller would perform the functions listed
below.
1. Sends commands to the Test Set to cause a program to be loaded off of a Memory Card
which is in the Test Set's front panel Memory Card slot.
2. Sends commands to the Test Set to run the program just loaded.
3. Passes control to the Test Set and then does other work while the Test Set is making
measurements.
When the Test Set is finished making measurements and has data available for the
External Controller, it passes control back to the External Controller.
4. The External Controller then requests the data from the Test Set.