Operating instructions
2-6
SCSI REFERENCE PRELIMINARY 1012975
CHAPTER 2—OVERVIEW OF THE AUTOLOADER AS A SCSI DEVICE
2.4 SCSI COMMAND PROTOCOL
This section describes the SCSI commands supported by the autoloader. The
host (or initiator) uses these commands to interact with the autoloader. This
section also describes the command status information returned by the
autoloader.
2.4.1 SUPPORTED SCSI COMMANDS
The initiator sends commands to the autoloader to request an operation.
Chapter 4 through Chapter 25 contain the detailed descriptions of the SCSI
commands. The commands are arranged in alphabetical order with each
command starting in a new chapter. For ease of reference, the command name
and operation code (OP code) are included in the header at the top of each
page.
Ta b l e 2 - 3 lists and briefly describes the SCSI commands supported by the
autoloader.
Note: The commands issued to the autoloader are independent of the
commands issued to the tape drive. For information about the commands
for the tape drive, refer to the documentation for the tape drive.
Table 2-3 SCSI command set supported by the autoloader
When you issue this
command …
OP
Code
The autoloader does this … Discussed
in...
INITIALIZE ELEMENT
STATUS (6 bytes)
07h Checks all element addresses for cartridges and
scans bar code labels.
Chapter 4
INITIALIZE ELEMENT
STATUS WITH RANGE
(10 bytes) (Exabyte-unique
command)
E7h Checks a range of elements or all the storage
elements for cartridges and scans bar code labels.
Chapter 5
INQUIRY (6 bytes) 12h Sends information about its parameters, including
the autoloader serial number, to the initiator.
Chapter 6
LOG SELECT (10 bytes) 4Ch Manages statistical information maintained by the
autoloader.
Chapter 7
LOG SENSE (10 bytes) 4Dh Returns statistical and condition information to the
initiator.
Chapter 8
MODE SELECT (6 bytes) 15h Accepts specific element addresses, LCD
information, and operating parameters from the
initiator. Can also prevent access to selected
operator panel menus.
Chapter 9
MODE SENSE (6 bytes) 1Ah Reports its operating mode parameters to the
initiator.
Chapter 10
MOVE MEDIUM (12 bytes) A5h Moves a cartridge from one location to another. Chapter 11