272 SCSI Guide
SCSI Commands
The topic provides information on Device Commands, SCSI Commands Format, and SCSI Command
Status Byte.
Device Commands
Table below shows the SCSI medium changer commands that are supported by the Scalar 1000 and Scalar
10K libraries.
MESSAGE REJECT 07h The MESSAGE REJECT message is sent
from the initiator or target to indicate that the
last message received was inappropriate or
not implemented.
Both
NO-OP 08h The NO-OP message is sent from the initiator
to inform the target that no message is valid in
response to the target request for a message.
Out
MESSAGE PARITY
ERROR
09h The MESSAGE PARITY ERROR message is
sent from the initiator to the target to indicate
that one or more bytes in the last message
received contained a parity error.
Out
BUS DEVICE
RESET
0Ch The BUS DEVICE RESET message is sent
from an initiator to clear all commands, data,
and status at the target. When the target
recognizes this message, it aborts the
command currently being executed, proceeds
to the BUS FREE state, and executes a hard
reset.
Out
IDENTIFY 80h or C0h The IDENTIFY messages are sent either by
the initiator or by the target to establish (or re-
establish) the logical connection path between
an initiator and target for a particular logical
unit. The Scalar 1000 and Scalar 10K libraries
only support a logical unit of 0.
Both
Operation code Command
07h INITIALIZE ELEMENT STATUS
E7h INITIALIZE ELEMENT STATUS WITH RANGE
12h INQUIRY
4Ch LOG SELECT
4Dh LOG SENSE
15h MODE SELECT
1Ah MODE SENSE
A5h MOVE MEDIUM
Message Code Description Direction
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