Operating instructions

15-14
SCSI REFERENCE 1012975
CHAPTER 15—READ ELEMENT STATUS (B8h)
Primary Volume Tag Information – Bytes 12 through 47
When the PVolTag field (in the Element Status page described on page 15-5) is
set to 1, the Primary Volume Tag Information field contains the volume tag
(bar code label) information of the element being reported by this element
descriptor. The autoloader supports eight bytes of volume tag information, so
only the first eight bytes reported are valid.
Note: Although the autoloader cannot scan a cartridge loaded in a tape drive,
bar code label information can be reported if the cartridge was scanned
before it was loaded inside the tape drive. The autoloader obtains this
information from the cartridge inventory. Check to see if the Except field
(byte 02, bit 2) is set to 1. If it is, the label information reported may be
inaccurate because the cartridge inventory is questionable.
Code Set – Byte 48 bits 3 through 0
The value returned for this field is 2h, which indicates that the Device
Identifier 1 field (Bytes 52-85) contains ASCII characters. If DVCID is 0, the
value for this field is set to 0.
Identifier Type – Byte 49 bits 3 through 0
The value returned for this field is 1h, which indicates that the first eight bytes
of the field contain the tape drive’s Vendor Identification as returned in the
tape drive’s Standard Inquiry Data. If DVCID is 0, the value for this field is set
to 0.
Identifier Length – Byte 51
The value returned for this field is 22h if DVCID is set to 1, which indicates
that the length of the Device Identifier field is 34 (22h) bytes, excluding this
byte. If DVCID is 0, the value for this field is set to 0.
Device Identifier – Bytes 52 though 85
This field contains the tape drive’s device identifier from the INQUIRY Device
Identification page (page code 83h), starting at byte 8, as returned by the tape
drive. Refer to the tape drive’s documentation for additional information.
Tape Drive Serial Number – Bytes 86 through 95
When either the S/N Req bit (described on page 15-3) is set to 1, the Tape Drive
Serial Number field contains the ten-byte tape drive serial number.
If the installed tape drive supports the extended data, the ten-byte tape drive
serial number (as received from the tape drive via the serial port) is appended
to the standard data transfer element descriptor. If the autoloader receives a
READ ELEMENT STATUS command before it has queried the tape drive, this
field contains UNKNOWN. If the tape drive does not support returning its
serial number to the autoloader, this field contains ten blanks.