HP 8753D - Page 628

System-Controller
Mode
This
mode allows
the
analyzer
to
control
peripherals
directly
in
a
stand-alone
environment
(without
an external
controller).
This
mode
can
only
be
selected
manually
from
the
analyzer's
front panel.
It
can
only
be
used
if
no
active
computer
or
instrument
controller
is
connected
to the
system
via
HP-IB
.
If
an
attempt
is
made
to
set
the
network
analyzer to
the
system-controller
mode when
another controller
is
connected
to
the
interface
,
the
following
message
is
displayed
on
the
analyzer's
display
screen:
"ANOTHER
SYSTEM
CONTROLLER
ON
HP-IB
BUS"
The
analyzer
must
be
set
to
the
system-controller
mode
in
order
to
access
peripherals
from
the
front
panel.
In
this
mode
,
the
analyzer
can
directly
control
peripherals
(plotters
,
printers
,
disk
drives
,
power
meters
,
etc
.)
and
the
analyzer
may
plot,
print, store
on disk
or perform
power
meter
functions
.
Note
Do
not attempt
to use
this
mode
for
programming.
HP
recommends
using
an
external
instrument
controller
when
programming.
See
the
following
section,
\T
alker/Listener
Mode
."
T
alker/Listener
Mode
This
is the
mode that
is
normally
used
for
remote
programming
of
the
analyzer
.
In
talker/listener
mode,
the analyzer
and
all
peripheral
devices
are
controlled
from
an
external
instrument
controller
.
The
controller
can
command
the
analyzer
to
talk
and
other
devices
to
listen.
The
analyzer
and
peripheral
devices
cannot
talk
directly
to
each
other
unless
the
computer
sets
up
a
data
path
between
them.
This
mode
allows
the
analyzer
to
act
as
either
a
talker
or
a
listener
,
as
required
by
the
controlling
computer
for
the
particular
operation
in
progress
.
P
ass-Control
Mode
This
mode
allows
the
computer
to
control
the
analyzer
via
HP-IB
(as
with the
talker/listener
mode),
but
also
allows
the
analyzer
to
take
control
of
the
interface
in order
to plot,
print,
or
access
a
disk.
During
an
analyzer-controlled
peripheral
operation,
the
host
computer
is
free to
perform
other
internal tasks
(i.e.
data or
display manipulation)
while
the
analyzer
is
controlling
the
bus
.
After
the analyzer-controlled
task is
completed, the
analyzer
returns
control
to
the
system
controller
.
Setting
HP-IB
A
ddresses
In systems
interfaced
using
HP-IB
,
each
instrument
on
the
bus
is
identied
by an
HP-IB
address. This address code must be dierent for each instrument on the bus
. These addresses
are stored in short-term, non-volatile memory
and are not aected when you press
4
PRESET
5 or
cycle the power
. The analyzer occupies
two HP-IB addresses: the instrument itself and the
display. The display address is derived from
the instrument address by complementing the
instrument's least-signicant bit. Hence
, if the instrument
is at an even address
, the display
occupies the next higher address
. If the instrument
is at an odd address
, the display occupies
the next lower address
.
The analyzer addresses are set by pressing
4
LOCAL
5
NN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNN
SET ADDRESSES
. In system-controller mode
,
the addresses must be set for the plotter, printer, disk drive, and power meter.
The default address for the analyzer is device 16, and the display address is device 17.
11-20 Compatible Peripherals