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4-53
The initiator does not intend to issue another message by activating ATN before it deactivates the ACK INITIATOR
DETECTED ERROR message.
Table 4-25
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, the scanner 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
MESSAGE IN Returns to the MESSAGE IN phase and sends the
message byte again
4.6.2.3 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 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
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 ABORT
message.
This scanner does not have a function that clears input/output operation for certain initiators. This scanner must have
been reserved when it is operated in multi-initiator environment.
4.6.2.4 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 AIN before it deactivates the ACK of MESSAGE
REJECT message.