Operating instructions

19-12
SCSI REFERENCE 1012975
CHAPTER 19—REQUEST VOLUME ELEMENT ADDRESS (B5h)
Access – Byte 02, Bit 3
This bit indicates whether the cartridge loader can pick or place a cartridge at
the tape drive location. The cartridge is accessible if it is unloaded from the
tape drive at that location. Accessibility is reported as follows:
0 The tape drive location may not be accessible (a cartridge was last reported
in the tape drive but is not currently unloaded).
1 The tape drive location is accessible (a cartridge is unloaded and waiting to
be picked, or the tape drive is empty).
Except – Byte 02, Bit 2
The Except (exception) bit indicates the current state of the tape drive, as
follows:
0 – The tape drive is in a normal state.
1 – The tape drive is in an abnormal state and the Additional Sense Code and
the Additional Sense Code Qualifier fields contain information regarding
the abnormal state.
Full – Byte 02, Bit 0
This bit indicates if the tape drive contains a cartridge. Since a match could
have been made only if there was a cartridge present, the value for this bit is
always 1.
Additional Sense Code (ASC) – Byte 04
If the tape drive is in an abnormal state, this field contains the value 83h. Refer
to Table 19-2 for the corresponding ASCQ values and a corrective action for
each abnormal state.
Additional Sense Code Qualifier (ASCQ) – Byte 05
The values for this field are listed in Table 19-2, along with the corrective action
to take for each abnormal state.
NotBus – Byte 06, Bit 7
This bit indicates whether the tape drive is attached to a medium transport
element on a different SCSI bus. Because the tape drive and the cartridge
loader are on the same SCSI bus, the valid value for this field is 0.
IDValid – Byte 06, Bit 5
This bit indicates that the SCSI Bus Address field (byte 07) contains valid
information as follows:
0 – The SCSI Bus Address field is not valid because a tape drive is not installed
at this location.
1 – The SCSI Bus Address field is valid because a tape drive is installed at this
location.