HP 8920B - Page 36

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Chapter 1, Using HP-IB
Getting Started
Using the HP-IB with the Test Set’s built-in IBASIC Controller
The Test Set has two HP-IB interfaces, an internal-only HP-IB at select code 8
and an external HP-IB at select code 7. The HP-IB at select code 8 is only
available to the built-in IBASIC Controller and is used exclusively for
communication between the IBASIC Controller and the Test Set. The HP-IB at
select code 7 serves three purposes:
1. It allows the Test Set to be controlled by an external controller
2. It allows the Test Set to print to an external HP-IB printer
3. It allows the built-in IBASIC Controller to control external HP-IB devices
IBASIC programs running on the Test Set’s IBASIC Controller must use the
internal-only HP-IB at select code 8 to control the Test Set. IBASIC programs
would use the external HP-IB at select code 7 to control HP-IB devices connected
to the rear panel HP-IB connector.
NOTE: Refer to "Overview of the Test Set" on page 18 for a detailed explanation of the Test Set’s
architecture.
When using a BASIC language Workstation with an HP-IB interface at select
code 7 to control the Test Set, HP-IB commands would look like this:
Example
! This command is sent to the Test Set at address 14.
OUTPUT 714;"*RST"
! This command is sent to another instrument whose address is 19.
OUTPUT 719;"*RST"
When executing the same commands on the Test Set’s IBASIC Controller, the
commands would look like this:
Example
OUTPUT 814;"*RST"
! Command sent to internal-only HP-IB at select code 8,
! Test Set’s address does not change
OUTPUT 719;"*RST"
! Command sent to external HP-IB at select code 7,
! other instrument’s address does not change.