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Identify
Type:
Purpose:
Descri pti on:
HP-IB Sequence:
ATN
I
P1~111111
Primary
Untalk
DSJ
Type:
Purpose:
Description:
HP 9895A Disc Memory Command Set
A-ll
Sense Commands
ATN
IP11ADDRSI
My
Secondary
Sense.
The 9895A will return a code unique to the disc subsystem
to allow for auto-configuration of systems.
Upon the reception of the untalk primary followed by the
secondary corresponding to the 9895A's current HP-IB
address, the 9895A's PHI will respond by sending the ID
bytes of
a
and 81 hex, the second byte being tagged with
an EO!. These two bytes will continue to be sent until
another command is transmitted on the bus.
I
ooo~~ooo
I
Byte 1
Sense.
EOI
1
10000001
ID
Byte 2
ATN
I
PllADDRS,
Other
Primary
The 9895A returns a byte indicating if the last operation
completed normally or abnormally, or if the power to the
9895A has just been restored, or if a parity error has been
detected on the HP-IB. The DSJ command also provides a
way to disable the 9895A's parallel poll response.
After accepting the DSJ secondary, the 9895A disables its
parallel poll response (usually within 100 microseconds)
and returns a byte (the DSJ byte) reflecting the status of
the controller.
DSJ
=
a -
The 9895A completed its last operation nor-
mally.
DSJ
=
1 - The 9895A aborted its last operation abnor-
mally. Status will indicate the current error.
DSJ
=
2 - The 9895A has just completed a power up se-
quence and is in the DSJ
=
2 holdoff state.
DSJ
=
3 - A parity error has occurred on the HP-IB.
Repeat the request to receive the pre-parity
error DSJ.
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