HP 9895A
Disc
Memory Command Set A-9
Commands
The details of the 9895A HP-IB
command
set
are
given in this section.
The
following
conventions are used:
P
P
D
P
P
E
ADDR
P
ATN
Eor
UUUU
or
UNIT
Stat
1
Stat
2
Byte
sent
between
the
bus
controller
and
the 9895A.
Parallel poll disabled.
Parallel poll enabled.
The
9895A's
current HP-IB device address.
HP
-IB parity bit.
HP-IB bus control signal; this signal indicates
that
a com-
mand
is
present
on
the
bus.
End
or
identify; this signal specifies that
the
present
data
byte
is
the
last of the
sequence
or,
if
ATN
is
concurrently
asserted,
then
a parallel poll
is
being
conducted
by
the
bus
controller.
Unit
number
(0
<=
UUUU
<=
3).
Status
one
word:
Most significant byte is S1;
Least significant byte is unit
number.
Status two word.
The
bit numbering notation for words
is
as
follows:
15
14
13 12
11 10 9 8 7 6 5 4
3 2 1 0
x X X X
XXXX
XXXX
XXXX
All
command
sequences
are
verified for validity when received. This involves testing
the
secondary
command,
the
command
number
and
the
number
of
data
bytes in
the
command
sequence
for correctness. An
I/O
program
error
is
defined
whenever
there
is
a
problem
with a
command
sequence.
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