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A
Connector
The
following
gure
shows
the
connector
and
pin
assignments
.
Connector
P
art
Number:
1251-0293
Figure
A
-6.
HP-IB
Connector
Caution
HP
products
delivered
now
are
equipped
with
connectors
having
ISO
metric-
threaded
lock
screws
and
stud
mounts
(ISO
M3.520.6)
that
are
black
in
color
.
Earlier
connectors
may
have
lock
screws
and
stud
mounts
with
imperial-threaded
lock
screws
and
stud
mounts
(6-32
UNC)
that
have
a
shiny
nickel
nish.
Caution
It
is
recommended
that
you
do
not
stack
more
than
three
connectors
,
one
on
top
of
the
other
.
Hand-tighten
the
connector
lock
screws
.
Do
not
use
a
screwdriver
.
HP-IB
Logic
Levels
The
polarization
controller
HP-IB
lines
use
standard
TTL
logic
,
as
follows:
True
=
Low
=
digital
ground
or
0Vdc
to
0.4Vdc
F
alse
=
High
=
open
or
2.5Vdc
to
5Vdc
All
HP-IB
lines
have
LOW
assertion
states
.
High
states
are
held
at
3.0Vdc
by
pull-ups
within
the
instrument.
When
a
line
functions
as
an
input,
it
requires
Installation
A-9