GPIB Operation
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Simple Transfers
The following files in the sub-directory GPIB-PC are of particular
use:
IBIC. EXE allows interactive control of the GPIB via functions en-
tered at the keyboard. Use of this program is highly recommended
to anyone who is not familiar with GPIB programming or with the
oscilloscope’s remote commands. An example of the use of
IBIC.EXE is shown in Appendix A.
DECL.BAS is a declaration file that contains code to be included
at the beginning of any BASICA application program. Simple
application programs can be quickly written by appending the
user’s instructions to DECL.BAS and executing the complete file.
IBCONF.EXE is an interactive program which allows inspection
or modification of the current settings of the GPIB handler. To run
IBCONF.EXE, refer to the National Instruments user’s manual.
In the program examples in this section, it is assumed that the
National Instruments GPIB driver GPIB.COM is in its default
state, i.e. that the user has not modified it with IBCONF.EXE.
This means that the interface board can be referred to by the sym-
bolic name ’GPIB0’ and that devices on the GPlB bus with
addresses between 1 and 16 can be called by the symbolic names
’DEVI’ to ’DEV16’.
Note: If you have a National Instruments PC2 interface card rath-
er than PC2A, you must run IBCONF to declare the presence of
this card rather than the default PC2A.
For a large number of remote control operations it is sufficient to
use just 3 different subroutines (IBFIND, IBRD and IBWRT) pro-
vided by National Instruments. The following complete program
reads the time-base setting of the oscilloscope and displays it on
the terminal:
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<DECL.BAS>
DEV$="DEV4"
CALL IBFIND(DEV$,SCOPE%)
CMD$="TDIV?"
CALL IBWRT(SCOPE%,CMD$)
CALL IBRD(SCOPE%,RD$)
PRINT RD$
END
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