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STORE
To halt
program, press
-
I
sroP
l
L-J
To
list
program
(print
out stored program),
press
I
END
ll
Ltsr
\/
Section
III
Ends
calculator
program.
To run this
program, press
10
20
3Q
3-134.
Special Trigger
Programming
Technique.
When
programming
the
3490A,
the E
indicates
the end
of
programming
information
and
allows
the 3490A
to
start
operating
according
to
the new programming
instruc-
tions.
The
instructions
are
stored
as they
are received
and
do not
require
the E
in order to
be accepted.
Because
of this,
one programming
technique
is
to
omit
the
E when
the programming
instructions
are sent,
and
then
transmit
the
E
when
it is
desired that
the
3490A
make
a reading.
However,
if
the
E is not
sent
with
the
programming
instructions,
the 34904
will take
a readin!"
either
when
MRE goes
LOW
or when
an
E
is sent,
whichever
occurs
first.
Consequently,
if
the
3490A
was
progammed
with
"M3Tl.
.
. ." initially,
and then
the
statement
CMD"?U6","E"
was
used, the
instrument
would
take
two
readings
instead
of one
as
programmed.
There
are two
ways
to
prevent
this:
a.
After
sending
the
programming
instructions,
d.on,t
change
the
listen
and,talk
addresses
until
the
E is sent.
For
example:
CMD
"?U6'"
"F3R7M3T1''
öMD,..E,,,
..?5'\P,
b. First program
the
34904
for
no trigger,
and then
reprogram
it
for
a trigger
when
a
reading
is to
be
made.
For example:
CMD
"?U6",
"F3M3R7T3E',
(The
E
is
op-
tional
in
this
statement)
Model 3490A
3-135.
Suppression
of CR
and LF. When
outputting
programming
instructions
from the 9800
series
calcula-
tors
without
using
the
CMD statement,
the
Carriage
Return
(CR)
and
Line Feed
(LF)
normally
output
by
the
calculator
must be
suppressed. If
not, they
are seen
as two
programming
characters
by
the
3490A.
CR and
LF
may
be suppressed
in
the
9820 by
transmitting,Z
at
the
end of
the instructions.
In
the
9830,
they
may
be
suppressed
by
sending
a
semicolon.
9820
example:
CMD
"?U6";FMT
"M3R7FQE",Z;WRT
13
9830 example:
CMD
"?U6''
OUTPUT
(13,
30)
..M3R7F@E";
FORMAT
B
3-136. Controlby
Marked
Card Programmer.
3-137.
The 34gOA
with
Option 030
maj, be pro-
grammed
by using
a Marked
Card Programmer
such
as
the
-hp-
Model
3260A
or
Model
9860A. An
example
of
marked
card programming
is shown in
Figure
3-10.
The
binary
code
shown
in
Table 3-7
is used in
marking
the
card.
Use
a
soft
black pencil
to
mark
each space
representing
a
"l"
in the
code. The
"200"
space
must
be
marked
whenever
the
3490A
is addressed
to listen
or
clear
(unaddressed).
The
"200"
bit
pulls
the
MRE line
LOW,
and should
be used
only for
addressing.
3-138.
The
following
instructions
must
be observed
for
reliable
programming.
.j
1. The
3490A
cannot
receive programming
data
whilö it
is making
a
reading. Therefoie,
if
tn.
:+gOR
i,
allowtid
to
sample, programming
instructions
from
the
card
reader
will be
ignored
by
the
3490A
while
it is
making
a reading.
Two
methods
may
be used
to control
sampling.
a. Before
programming,
set the
3490A
Sample
Rate
control to
the
HOLD position.
Do not program
trigger
mode.
Instead,
after programming
is com-
pleted,
change
the
Sample Rate
control
manually
from
the
HOLD
position
to the
desired sample
rate.
Then
if
a subsequent
change
in the
3490A program
is
necessary,
the
Sampie
Rate
control must
be
set to the
HOLD
position
again
before
programming.
b.
Set
the
3490A
Sample Rate
control
to the
HOLD position
and program
the
3490A
for trigger
mode
T1
,
Immediate
Internal
Trigger.
In
this
mode,
the
3490A
will continue
to
sample
at
the
maximum
rate, and the
front
panel
control
setting
will
have no
effect.
In
order to
reprogram
the 34904
under these
conditions,
the
3490A
Une switch
should
be tumed
OFF
and back
ON
again. This
returns the
instrument
to local (front
panel)
control.
-1-ll
c\tD
"?u6",
..TlE",,.?5V"