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Scanner Interface
Appendix A-110
Upon receiving the MESSAGE REJECT message, this scanner takes action as shown in the
following table.
Message rejected Action
COMMAND COMPLETE Moves to the BUS FREE phase.
(It is not assumed as an error.)
MESSAGE REJECT Responds the CHECK CONDITION status
DISCONNECT
The command execution is continued with
connecting the SCSI bus (without disconnecting).
SAVE DATA POINTER The command execution is continued with
connecting the SCSI bus (without disconnecting).
IDENTIFY When this message is issued for reconnection, the
command is terminated with an error. In this case,
the reconnection for the command is not performed
RESTORE POINTERS
The error recover is interrupted and the CHECK
CONDITION status is responded.
SYNCHRONOUS DATA
TRANSFER REQUEST
The command execution is continued in
Asynchronous transfer mode.
No message issued Moves to the BUS FREE phase
(5) NO OPERATION (X’08’) : MESSAGE OUT phase (initiator → target)
This message is issued in response to a message request from the target and indicates that the
initiator does not have a valid message.
The initiator does not intend to issue another message by activating ATN before it deactivates the
ACK of the NO OPERATION message.
(6) MESSAGE PARITY ERROR (X’09’) : MESSAGE OUT phase (initiator → target)
This message indicates that the initiator detected a parity error in the message received. The target
resends only that message.
The initiator does not intend to issue another message by activating ATN before it deactivates the
ACK of the MESSAGE PARITY ERROR message.
Upon receiving the MESSAGE PARITY ERROR message, this scanner takes action as shown in the
following table.
Phase when ATN is
detected
Action
MESSAGE IN
Moves to the MESSAGE IN phase and resends the
message (*1)
Other Moves to the BUS FREE phase
*1 This scanner retries three times with the message in the MESSAGE IN phase. If the third retry fails,
this scanner immediately moves to the BUS FREE phase.