Operating instructions

12-2
SCSI REFERENCE 1012975
CHAPTER 12—POSITION TO ELEMENT (2Bh)
12.2 WHAT YOU SEND TO THE AUTOLOADER
Transport Element Address – Bytes 02 and 03
This field is checked for the value set by the MODE SELECT (15h) command.
It should contain 0 or the element address of the cartridge loader.
Destination Element Address – Bytes 04 and 05
This field allows you to specify the address of the element where the cartridge
loader is to be positioned.
Invert – Byte 08, Bit 0
The autoloader does not support the Invert function, so you must specify a
value of 0 for this bit.
12.3 COMMAND STATUS
The autoloader returns a status byte after processing the POSITION TO
ELEMENT 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 or the cartridge
loader 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 has experienced an unrecoverable hardware error.