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4.4.13 MODE SENSE (6)
The normal MODE SENSE (6) sequence for the scanner is as follows:
Proce>
dure
Bus phase Initiator operation ¨Æ Target operation
1
2
3
4
5
6
7
8
9
Bus Free
(Arbitration)
Selection
(Message Out)
Command
Data In
Status
Message In
Bus Free
Checks Bus Free
Acquires the bus use right
Selects the target
Selects the logical device
Specifies MODE SENSE (6)
(CDB)
Reports MODE SENSE
parameter data
Æ
Æ
Æ
¨
¨
¨
Drives the BSY signal
Reports mode data
Reports GOOD status
Reports message
(Command complete)
Releases the BSY
signal
(1) MODE SENSE (6) command: Command phase (Initiator to Target)
The MODE SENSE (6) command is used for the target to report mode parameters
to the initiator.
The command descriptor block (CCD) is as follows:
Byte 0
1
2
3
4
5
Operation code X©1Aπ
Logical unit number
7 6 5 4 3 2 1 0
Reserved Reserved
PC
Control byte
DBD
Page code
Reserved
Allocation length
4 $ 84