5
Setting
the
HP-IB
A
ddress
Y
ou
can
only
set
the
HP-IB
address
from
the
front
panel.
See
\Setting
the
HP-IB
A
ddress"
in
Chapter
4.
The
default
HP-IB
address
is
24.
Returning
the
Instrument
to
Local
Control
If
the
instrument
has
been
operated
in
remote
the
only
key
you
can
use
is
N
NNNNNNNNNNNNNNNN
Local
.
The
N
NNNNNNNNNNNNNNNN
Local
key
returns
the
instrument
to
local
control.
N
NNNNNNNNNNNNNNNN
Local
does
not
operate
if
local
lockout
has
been
enabled.
How
the
P
olarization
Controller
Receives
and
Transmits
Messages
The
polarization
controller
exchanges
messages
using
an
input
and
an
output
queue
.
Error
messages
are
kept
in
a
separate
error
queue
.
How
the
Input
Queue
W
orks
The
input
queue
is
a
FIFO
queue
(rst-in
rst-out).
Incoming
bytes
are
stored
in
the
input
queue
as
follows:
1.
Receiving
a
byte:
a.
Clears
the
output
queue
.
b.
Clears
Bit
7
(MSB).
2.
No
modication
is
made
inside
strings
or
binary
blocks
.
Outside
strings
and
binary
blocks
,
the
following
modications
are
made:
a.
Lower-case
characters
are
converted
to
upper-case
.
b.
The
characters
00
16
to
09
16
and
0B
16
to
1F
16
are
converted
to
spaces
(20
16
).
c.
Two
or
more
blanks
are
truncated
to
one
.
Remote
Operation
5-3