Agilent Technologies 8504B - Controlling the Instrument

FINAL TRIM SIZE : 7.5 in x 9.0 in
Controlling
the
Instrument
Three
HP-IB
modes
are
available
The
precision
reectometer
can
be
set
to one
of three
HP-IB modes:

T
alker/listener

System
controller

P
ass
control
The
4
PRESET
5
key
does
not
aect the
selected controller
mode
,
but
cycling
the
power
returns
the
precision
reectometer
to
the
talker/listener mode
.
The
talker/listener
mode
is
the
normal
mode
of operation.
In
this
mode
,
a
computer
controller
communicates
with
the
precision
reectometer
and
other
instruments
over
the
bus
.
The
computer
sends
commands
or
instructions
to
and
receives
data
from
the
precision
reectometer
.
All
of
the
capabilities
available
from
the
precision
reectometer's
front
panel
can
be
used
in
this
remote
operation
mode
,
except
for
control
of
the
power
line
switch
and the
reference
polarization
balance
knobs
.
In
system
controller
mode
,
the
reectometer
itself
can
use
HP-IB
to
control
compatible
peripherals
without
the
use
of
an
external
computer
.
It
can
output
measurement
results
directly
to
a
compatible
printer or
plotter
,
and
store
instrument
states
using
a
compatible
disk
drive.
In
pass
control
mode
,
the
controller can
pass control
of
the
bus
to
the
precision
reectometer
on
request
from
the
precision reectometer
. The
precision
reectometer
is
then
the
controller
of the
peripherals,
and can
direct them
to plot,
print, or
store
without
going
through
the
computer
.
When the
peripheral operation
is complete
,
control
is
passed
back
to
the
computer.
Only one
controller can
be
active
at
one
time
.
The
computer
remains the
system controller
and can
regain
control
at
any
time
.
Set
the
HP-IB
address
from the front panel
In
HP-IB
communications
,
each
instrument
on
the bus
is
identied
by
an
HP-IB address
. This decimal-based address code must be dierent for each
instrument on the bus
. Most of the HP-IB addresses are set at the factory and
need not be modied for normal system operation.
4-4
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