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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