Pioneer SCSI-2 - Manual (Page 17)

Preface
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1.3.3 Status Phase
Four status conditions are supported. They are
GOOD 00h
CHECK CONDITION 02h
BUSY 08h
RESERVATION CONFLICT 18h
When the IMMED bit is set to “1” (TRUE) in a command block, the drive returns
GOOD when the command is first interpreted. As the command is being executed, the
drive returns BUSY to successive commands until operation of the first command is
complete and the drive is ready to receive a new command.
Refer to Section 2.31 REQUEST SENSE for details on deferred error reporting.
1.3.4 In-Phase/Out-Phase Messages
The DRM/DR-U Series supports only those In-Phase and Out-Phase Messages that are
listed below and on the following page. The drive will return a MESSAGE REJECT
for any messages received other than those listed.
Message Msg 05h + 09h will cause the drive to go to BUS FREE PHASE without a
retry.
Message In-Phase (issued by drive)
COMMAND COMPLETE 00h
SAVE DATA POINTER 02h
DISCONNECT 04h
MESSAGE REJECT 07h
IDENTIFY 80h - FFh
SYNCHRONOUS DATA TRANSFER REQUEST 2 01h
2 From EXTEND MESSAGE (01h)