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A.4 Commands
Appendix A-23
4) A hardware reset condition is detected.
The condition in effect after 3) or 4) is indicated by a sense key X’6’ (UNIT
ATTENTION), which is returned in response to a subsequent command.
When a logical unit is already reserved by another initiator, if a command other than
RELEASE UNIT, INQUIRY, or REQUEST SENSE is issued, the target returns the
following status:
• Status: B’01100’ (RESERVATION CONFLICT)
The initiator having reserved a logical unit can change the reservation by issuing the
RESERVE UNIT command to the same logical unit.
The command descriptor block (CDB) of this command is shown in the following
illustration.
a. TP (third party) : Byte 1
As this scanner does not support the 3rd party reservation option, setting this bit to 1
causes the target to return the following error information:
• Status: B’00001’ (CHECK CONDITION)
• Sense key: X’5’ (ILLEGAL REQUEST)
b. TPID (third party device ID): Byte 1
This scanner ignores TPID.
2
1
Byte 0
3
4
5
Operation code X’16’
Logical unit number
TP
TPID
(Reserved)
(Reserved)
Control byte
7
6
5
4
3
2
1
0