A.6 Messages
Appendix A-109
When this scanner receives the INITIATOR DETECTED ERROR message, this scanner enters the
MESSAGE IN phase and sends the RESTORE POINTERS message to the initiator. Then this
scanner returns to the original phase and makes a retry.
After issuing the RESTORE POINTERS message, this scanner takes action as shown in the
following table.
ATN detection
phase
Action
SELECTION
Moves to the BUS FREE phase
COMMAND
Discards the CDB already received and returns to the COMMAND
phase
DATA OUT
Discards the data already received and returns to the DATA OUT phase
DATA IN
•
When transferring image data, enters the DATA IN phase.
If the memory option is provided, transfers image data again. If no
memory option is provided, moves to the STATUS phase (Check
Condition)
→
MESSAGE IN phase (Command Complete)
→
BUS
FREE phase and keeps the sense key X’B’ (Aborted Command).
•
When transferring inquiry data or sense data, returns to the DATA
IN phase and transfers data again
STATUS
Returns to the STATUS phase and sends the status byte again
MESSAGE OUT
Ignores this message (does not issue the RESTORE POINTERS
message)
MESSAGE IN
Returns to the MESSAGE IN phase and sends the message byte again
(3)
ABORT (X’06’) : MESSAGE OUT phase (initiator
→
target)
The initiator requests the target to clear the input/output operation of the specified I/O unit (i.e., the
input/output operation ordered by the initiator that issued this message) and to move to the BUS
FREE phase. Input/output operations ordered by other initiators are not affected.
If a logical unit is not identified before the ABORT message, the target merely moves to the BUS
FREE phase.
If no operation to be cleared, an error does not occur.
The initiator does not intend to issue another message by activating ATN before it deactivates the
ACK of the ABORT message.
This scanner does not have a function that clears input/output operation for certain initiators. The
scanner must have been reserved when it is operated in multi-initiator environment.
(4)
MESSAGE REJECT (X’07’) : MESSAGE IN/OUT phase (initiator
→
target)
This message indicates that a transferred message was rejected by the receiver as invalid or
unexecutable.
The initiator does not intend to issue another message by activating ATN before it deactivates the
ACK of the MESSAGE REJECT message.
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