A-14
HP 9895A Disc Memory Command
Set
Read
Loopback
Record
Type:
Purpose:
Description:
HP-IB Sequence:
ATN
rlO~DDRSI
Primary
Talk
Status:
Parallel
Poll:
ATN
I
Pllllll0
I
Secondary
Sense.
The 9895A sends up to
256
bytes (see Write Loopback
Record) from its internal data buffer over the
HP-IB. This is
used by diagnostics to test the
HP-IB
data
path.
Upon accepting the loopback secondary, the 9895A
sends
the bytes stored
in
its internal buffer. The most significant
byte of the first word is transferred first. The 256th byte
will
be tagged with
an
EOI
and
the transfer terminated.
If
fewer
than
256
bytes are requested, the device
will
realize that
the transfer is complete when:
1.
The 9895A has been untalked,
2. It accepts another byte from the
HP-IB.
P
P
D
No errors.
Sl
-0
- 1
to
256
Bytes
-+
Stat 2 - Unchanged
DSJ - Unchanged
EOI
ATN
P
~
I
PIOlllllI
Untalk
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.
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