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',
Not only can
the 3468A
be controlled
by the -hp- Model
41C/41CV
calculator,
but it can also talk to the calculator. The calculator can then process the measure-
ment
data or status information
as necessary.
From the last section we saw how to program the 3468A
to take one ac voltage
reading on the 300mV
range.
Now
let's see how
to transfer the measurement
from the 3468A
to the calculator.
Keystrokes
Display
XEQ}
[ALPHA]
IND
[ALPHA]
XEQ IND
That is all there is to it. The measurement will appear in the calculator's display as
well as in the X-register. Since the reading is in the X-register it is ready to be
operated on by the calculator. You could take the log of the reading by pressing
the LOG
key for example.
IND (INput Decimal)
is an instruction that causes the
3468A to talk (TLK annunciator) to the calculator, giving it the measurement data.
If you look closely at what we have done, we have actually written a very simple
program. The program
instructs the 3468A to take a particular type of measure-
ment
and send the measurement
results to the calculator.
Later, you'll learn to
complete the program by adding a label and an END or return statement.
Look at
the listing below and compare it to the instructions previously executed.
GLoLBL "ACYOLTS*
G2 "FeRIRAZIN4T2°
83 OUTA
44 IND
85 END
HP-IL Interface
Control
Before pursuing further the subject of program
writing,
let's look at some special
HP-IL commands.
In the examples
we've
looked
at so far, commands
like IND,
OUTA,
or REMOTE
were
used.
These
commands
are
called
Interface
Control
Operations.
Now
you'll learn what these and other operations mean and how they
are used. The control operations allow you to directly specify a device to perform
a function, send or receive information, or control the interface loop. These control
operations also allow more
than one 3468A
to be used in the loop along with
almost any other HP-IL device.
34
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