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HP 1630A User Manual

HP 1630A
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An
HP-113
Overview

Model1630A/D/G
Information
is
transmitted
on
the
data
lines
undersequential
control
of
the
three
handshake
lines
(DAV,
NRFD,
and
NDAC)
.
No
step
in
the
sequence
can
be
initiated
until
the
previous
step
is
completed
.
Information
transfer
can
proceed
as
fast
as
devices
can
respond,
but
no
faster
than
allowed
by
the
slowest
device
presently
addressed
as
active
.
This
permits
several
devices
to
receive
the
same
message
byte
concurrently
.
The
ATN
line
is
one
of
the
five
bus
management
lines
.
When
ATN
is
true,
addresses
and
universal
commands
are
transmitted
on
only
seven
of
the
data
lines
using
the
ASCIIcode
.
When
ATN
is
false,
any
code
of
8
bits
or
less
understood
by
both
talker
and
listener(s)
may
be
used
.
The
IFC
(interface
clear)
line
places
the
interface
system
in
a
known
quiescent
state
.
The
REN
(remote
enable)
line
is
used
with
the
Remote,
Local,
and
Clear
Lockout/Set
Local
Messages
to select
either local
or
remote
control
of
each
device
.
Any
active
device
can
set
the
SRQ
(service
request)
line
true via
the
Require
Service
Message
.
This
indicates
to
the
controller
that
some
device
on
the
bus
wants
attention,
such
as
a
counter
that
hasjust
completed
a
time-
interval
measurement
and
wants
to
transmit
the
reading
to
a
printer
.
The
EOI
(end
or
identify)
line
is
used
by
a
device
to
indicate
the
end
of
a
multiple-byte
transfer
sequence
.
When
a
controller sets
both
the
ATN
andEOI
lines true,
each
device
capable
of
a
parallel
poll
indicates
its
current
status
on
the
DIO
line
assigned
to
it
.
In
the
interest
of
cost-effectiveness,
it
is
notnecessary
for
every
device
to
be
capable
of
responding
to
all
the
lines
.
Each
can
be
designed
to
respond
only
to
those
lines
that
are
pertinent
to
its
function
on
the
bus
.
The
operation
of
the
interface
is
generally
controlled
by
one
device
equipped
to
act
as
controller
.
The
interface
transmits
a
group
of
commands
to
direct
the
other
instruments
on
the
bus
in
carrying
out
their
functions
of
talking
and
listening
.
The
controller
hastwo
ways
of
sending
interface
messages
.
Multi-line
messages,
whichcannot
exist
concurrently
with
other
multi-line
messages,
are
sent
over
the
eight
data
lines
and
the
three
handshake
lines
.
Uni-line
messages
are
transferred
over
the
five
individual
lines
of
the
management
bus
.
The
commands
serve
several
different
purposes
:
B-
4
Addresses,
or talk
and
listen
commands
select
the
instruments
that
will
transmit
and
accept
data
.
They
are
all
multi-line
messages
.
"
Universal
commands
cause
every
instrument
equipped
to
do
so
to
perform
a specific
interface
operation
.
They
include
multi-line
messages
and
three
uni-line
commands
:
interface
clear
(IFC),
remote
enable
(REN),
and
attention
(ATN)
.
"
Addressed
commands
(also referred
to
as
primary
commands)
are
similar
to
universal
commands,
except
that
they
affect
only
those
devices
that
are
addressed
and
are
all
multi-line
commands
.
An
instrument
responds
to
an
addressed
command,
however,
only
after
an
address
has
already
told
it
to
be
talker
or
listener
.
"
Secondary
commands
are
multi-line
messages
that
are
always
used
in
series with
an
address,
universal
command,
or
addressed
command
to
form
a
longer
version
of
each
.
Thus
they
extend
the
codespace
when
necessary
.
To
address
an
instrument,
the
controller
uses
seven
of
the
eight
data-bus
lines
.
This
allows
instruments
using
the
ASCII
7-bit
code
to
act
as
controllers
.
As
shown
in
the
table,
five bits
are
available
for
addresses,
and
a
total
of 31
allowable
addressesare
available
in
one
byte
.
If
all
secondary
commands
are
used
to
extend
this into
a
two-byteaddressing
capability,
961
addresses
become
available
(31
allowable
addresses
in
the
second
byte
for
each
of
the
31
allowable
in
the
first
byte)
.

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HP 1630A Specifications

General IconGeneral
BrandHP
Model1630A
CategoryMeasuring Instruments
LanguageEnglish

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