EasyManuals Logo

HP 9845B/C CE Service Manual

HP 9845B/C CE
113 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #82 background imageLoading...
Page #82 background image
HP-IB
Sequence:
ATN
fPOl~DDRSI
Pnmary
Listen
ATN
IPOl~DDRSI
Pflmary
Talk
Status:
ATN
HP 9895A Disc Memory Command Set A-35
As
has
been
seen,
the
unbuffered
read
actually
uses
the
internal
buffer
to
store
the
data.
However,
the
protocol
used
is
unbuffered
in
that
the
parallel poll
response
is
not
used
to
indicate
when
data
is available.
Thus,
there
is a
pause
in
data
flow to
the
HP-IB
each
time
the
buffer is
re-filled from
the
disc. This
pause
occurs
at
the
beginning
of
the
read
and
after
every
sector
has
been
transferred.
Depending
on
when
the
read
is
started
and
the
sector
inter-
leaving, this
pause
may
be
up
to 160 milliseconds long.
Unbuffered Read Request
EOJ ATN
P
P
Pll0l000
P 00101
UUUU
1
P
I
POllllll
l
I
Secondary
I
D
Opcode
I
E
Unit Unlisten
Send
Data
Request
ATN
EOJ
P
P
I
Pll00000
I
P P
D
E
Secondary
~
Data
Bytes -
No errors.
Sl
- 0
Stat
2 -
Unchanged
DSJ
- 0
Unsuccessful
read.
Sl
-
Error
Stat
2 - Bits
A,
E
and
C set,
if
appropriate.
DSJ
-1
ATN
IPlOllllll
Untalk
Requirement
for Execution:
See
Buffered
Read.
Parallel Poll:
The
parallel poll
response
is
re-enabled
after
the
operation
is
completed,
normally
or
abnormally.
If
less
than
the
specified
number
of
bytes
is
accepted
by
the
HP-IB
controller,
the
parallel
poll
response
will
be
re-
enabled
by
the
Untalk
command.

Table of Contents

Other manuals for HP 9845B/C CE

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the HP 9845B/C CE and is the answer not in the manual?

HP 9845B/C CE Specifications

General IconGeneral
BrandHP
Model9845B/C CE
CategoryStorage
LanguageEnglish

Related product manuals