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Section
III
Model
3455A
Address
3455A
Program
Command
Information
wrt 722.
-FI
R3
A0
Hi
M3
T3"
3455A
listen
L
—
-
address
output
to
the
(decimal equivalent)
bus, includes
the
unlisien
command
and
calculator talk
address
Program
data
message
using the
982SA
Calculator.
3-64.
Eataring
MATH
Censtants
(Y
and
Z)
from
tha Bat.
The
following
data
message
illustrates
the
program
informa-
tion
necessary to enter
numbers
into
the
Y
and
Z
registers:
Address
Program
Command
Information
(refer
to Controller
Manual)
'EY
123.456
SY EZ
45.6789 SZ
"
Enters
number
in
"Z"
Register
Programs
the
L
3455A
to store
the displayed
number
in
the
"Y"
Register.
Number
to
be entered
Programs
the
3455
A
to
enter
numerical data
into the display
addresses controller
to
"talk"
and
34S5A
to "listen"
The number
stored
in
the
Y
or
Z
register
can
be read
from
the
Bus by
programming
the
ENTER
feature
and
the particular
register.
This
transfers the
number
from
the storage
register
specified to the display.
The number
displayed
is
output
to the
Bus by
addressing the
34S5A
to
"talk".
The number
is
returned to the storage
register
by programming
the
STORE
feature
and
the
desired
register.
The
following
example
illustrates
how
to
read the
numbers
stored
in
the
Y
and
Z
register
from
the Bus:
Address
Command
wrt
722
.
"EY"
Addresses
the
controller
(9825A)
to
"talk"
and
the
3455A
to "listen"
Transfers the
number
stored
in
the
Y
register
into the
3455A
display
red
222
.
A
;
^
P
A
Addresses
the
34S5A
to
"talk"
and
1
the controller
(9825A)
to
"listen"
Outputs
the
contents of
the
controller's
"A"
register
to the display
Specifics the
controller
register
to receive the
number
wrt
722
.
"SY"
Addresses
the
Returns
the
number
in
controller
(9825A)
to
J
the
3455A
display to the
Y
"talk"
and
the
345SA
register
to "listen"
3 85.
Data Raady
Raquaat
The
DATA READY
Request
feature
permits the
34S5A
to signal
the controller
upon
the
completion of
a
measurement. This
feature
would
normally
be used
where
the
3455A
is
triggered
from an
external source. In
this
mode
of
operation, the
34SSA
is
programmed
to
the
appropriate
measurement
parameters
(FUNCTION,
RANGE,
etc.).
The
con-
troller
is
then
free to
control other
instruments
on
the
Bus.
Upon
being
triggered,
the
3455A makes
a measure-
ment and
outputs a
"Require
Service"
message
to
notify the controller that the
measurement
information
information
is
ready.
Upon
receiving the service
re-
quest, the controller
with
serial
poll
the
34SSA
to deter-
mine
the
nature
of
the
service request.
Upon
being
poll-
ed, the
3455A
outputs a
status byte, in this
case the
ASCII
character
"A"
(decimal
65),
indicating the
measurement
data
is
ready.
The
controller
then
disables
the
serial
poll
and
reads the
measurement
data.
The
pro-
gram
codes
for
the
DATA READY
RQS
feature
are:
D0
Data Ready
Request
off
Di Data Ready
Request
on
3-66. Binary
Program
Faatara.
The
BINARY
PROGRAM
feature
permits the
status
of
the
FUNCTION, RANGE,
TRIGGER,
MATH, AUTO-CAL
and
HIGH
RESO-
LUTION
controls to
be determined
or
programmed
from
the
bus
in
four
8-bit
binary words.
The
BINARY
PROGRAM
feature allows
faster
programming
of
the
345SA
by
reducing
the
number
of
program
data
bytes
from
a
maximum
of
12 for
normal programming
to
4
data
bytes
for
binary
programming.
The
BINARY
PROGRAM
codes can
also
be
read
and
stored
by
the
controller to
re-program
the
345SA
at
a
later
time
(see
Appendix
A).
One
important
thing
to
remember
is
to
send
a
"B"
to the
3455A
in
order
to
put
the
instrument
into
the
BINARY
mode.
Table
3-5
lists
the allowable
BINARY
PROGRAM
codes
for
each of
the four
data
bytes
and
the front pane]
keys they
control.
3-10
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