”The BUS DEVICE RESET message is sent from any initiator.
‘A hardware reset condition is detected.
The condition in effect after ” or ‘ 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:
f 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.
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| 3 | 2 | 1 | 0 |
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Byte 0 |
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| Operation code X©16 |
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1 |
| Logical unit number | TP |
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5 |
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| Control |
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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:
f Status: B©00001 (CHECK CONDITION)
f Sense key: X©5 (ILLEGAL REQUEST)
b.TPID (third party device ID) : Byte 1 This scanner ignores TPID.
4 $ 23