HP 8920A Programmer's Manual page 30

Chapter 1, Using HP-IB
Overview of the Test Set
External Automatic Control Mode
30
In External Automatic Control mode the Test Set's operation is controlled by an
external controller connected to the Test Set through the HP-IB interface. When in
External Automatic Control mode the Test Set's internal configuration is the same
as in Manual Control Mode with two exceptions:
1. Configuration and setup commands are received through the external HP-IB interface,
select code 7, rather than from the front-panel keypad/rotary knob.
2. The MEASure command is used to obtain measurement results and DUT data through
the external HP-IB interface.
shows how information is routed inside the Test Set in Manual
Figure 1 on page 32
Control mode.
Figure 1
the IBASIC Controller (Memory Card, ROM disk, Serial Interface #10) and are
not directly accessible to the user in Manual Control Mode. In addition,
shows that Serial Interface #9 and Parallel Printer Interface #15 are accessible as
write-only interfaces for printing in Manual Control mode. These same conditions
are true when in External Automatic Control mode. If the user wished to access
these resources from an external controller, an IBASIC program would have to be
run on the Test Set from the external controller.
also shows that certain Test Set resources are dedicated to
figure 1