User`s manual

246 Chapter 8
O:\Manuals\E6380A_Progguid\Book\Ibasic.fm
IBASIC Controller
Method #1. Program Development on an External BASIC Language Computer
Program Development Procedure
As discussed in “Overview of the Test Set” on page 22, the Test Set has
two HP-IB buses, an internal HP-IB at select code 8 and an external
HP-IB at select code 7. The Test Set’s built-in IBASIC controller uses
the internal HP-IB to communicate with the Test Set’s various
instruments and devices. The process of developing a program on an
external BASIC language computer utilizes this hardware feature to an
advantage. First, develop the program directly on the external BASIC
language computer treating the Test Set as a device on the external
BASIC language computer’s HP-IB. For example, to setup the Test Set’s
RF Generator use the OUTPUT command with the Test Set’s HP-IB
address. If the select code of the HP-IB card in the external BASIC
language computer is 7 and the address of the Test Set is 14 the address
following the OUTPUT command would be 714. When the command
executes on the external BASIC language computer the information on
how the Test Set’s RF Generator is to be configured is sent to the Test
Set through its external HP-IB bus. After the program is fully
developed, making it run on the Test Set is simply a matter of changing
the address of all the HP-IB commands to 8XX (Test Set internal HP-IB
bus) and downloading the program into the Test Set’s IBASIC controller
and executing it.
There are two ways of allowing easy conversion of all HP-IB commands
to a different address.
• The first way is to establish a variable to which the 3-digit address
number is assigned.
Example 8-3 Example
10 Addr = 714 ! Sets the value of variable Addr to be 714.
20 OUTPUT Addr;"*RST"!Commands the Test Set to reset at
address 714.
To change the address, simply change the value of variable Addr to
814:
Example 8-4 Example
10 Addr = 814 ! Sets the value of variable Addr to be 814.
20 OUTPUT Addr;"*RST"! Commands the Test Set to reset at
address 814.
• A second method is to assign an I/O path to the desired I/O port.
To control device #14 on the port with select code 7: