GPIB Operation 3
InterFace Clear
A safe way to ensure that all commands have been interpreted is to
append a query (e.g. "*STB?") to the command string and to wait
for the response before sending a GTL.
The InterFace Clear message (IFC) initializes the GPIB but has
effect on the operation of the oscilloscope.
PROGRAMMING
GPIB TRANSFERS
Configuring the
GPIB Hardware
Configuring the
GPIB Driver Software
To illustrate the GPIB programming concepts a number of exam-
ples written in BASICA are included in this section. It is assumed
that the controller is IBM-PC compatible, running under DOS,
and that it is equipped with a National Instruments
2
GPIB inter-
face card. GPIB programming with other languages such as C or
Pascal is quite similar.
If you use another computer or another GPIB interface, refer to
the interface manual for installation procedures and subroutine
calls similar to those described here.
2.
National Instruments Corporation,
Check that the GPIB interface is properly installed in the comput-
er. If it is not, follow the installation instructions of the interface
manufacturer. In the case of the National Instruments interface, it
is possible to modify the base I/O address of the board, the DMA
channel number and the interrupt line setting using switches and
jumpers. In our program examples, they are assumed to be left in
their default positions.
Connect the oscilloscope to the computer with a GPIB interface
cable. Set the GPIB address on the rear of the instrument to the
required value. The program examples assume that it is set to 4.
Remember to power the instrument up after setting the GPIB ad-
dress.
The host computer needs an interface driver which handles the
transactions between the user’s programs and the interface board.
In the case of the National Instruments interface, the installation
procedure:
¯ copies the GPIB handler GPIB.COM into the boot directory.
¯ modifies the DOS system configuration file CONFIG.SYS to
declare the presence of the GPIB handler.
¯ creates a sub-directory GPIB-PC.
¯ installs in GPIB-PC a number of files and programs which are
useful for testing and reconfiguring the system, and for writing
user programs.
12109 Technology Boulevard, Austin, Texas 78727
15
To Next Page
Loading...
Need help?
General
