Operating instructions

15-16
SCSI REFERENCE 1012975
CHAPTER 15—READ ELEMENT STATUS (B8h)
15.4 COMMAND STATUS
The autoloader returns a status byte after processing the READ ELEMENT
STATUS command. This section describes when each type of status byte might
be returned.
Good
The autoloader returns Good status when it is able to process the command
without errors.
Busy
The autoloader returns Busy status when it is processing a command for a
different initiator or when it is in the process of aborting a motion command.
Reservation Conflict
The autoloader returns Reservation Conflict status when it is reserved by a
different initiator. See Chapter 20 for more information about the RESERVE
command.
Check Condition
The autoloader returns Check Condition status for the following reasons:
 The message system is enabled and a message error occurs while the
autoloader is processing the command.
 The autoloader detects an unrecoverable parity error while receiving the
CDB.
 The command is issued to an invalid LUN.
 A Unit Attention condition is pending for the initiator.
 The autoloader is not ready because the door is open.
 A reserved bit is set to 1 in the CDB.
 A parameter in the CDB is invalid (see Table 15-3 for sense data).
Table 15-3 Invalid parameters in the READ ELEMENT STATUS CDB
Sense
Key
ASC ASCQ
SKSV
Bit
C/D
Bit
BPV
Bit
Bit
Pointer
Field
Pointer
Error
5h 21h 01h 1 1 0 0 0002h Invalid starting element address.
5h 24h 00h 1 1 1 — —
A reserved bit is set in the CDB. The
pointers point to the bit in error.
5h 24h 00 1 1 1 3h 0001h Invalid element type code.