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Scanner Interface
Appendix A-100
A.4.13 MODE SENSE (6)
The normal MODE SENSE (6) sequence for the scanner is as follows:
Step Bus phase Initiator operation
← →
Target operation
1 Bus Free Checks Bus Free
2 (Arbitration) Acquires the bus use
right
3 Selection Selects the target
→
Drives the BSY signal
4 (Message Out)
Selects the logical
device
→
5 Command Specifies MODE
SENSE (6) (CDB)
→
6 Data In
Specifies MODE
SENSE parameter
data
→
Reports mode data
7 Status
←
Reports the GOOD status
8 Message In
←
Reports message
(Command complete)
Releases the BSY signal
9 Bus Free
(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 (CDB) is as follows:
Byte 0
1
2
3
4
5
Operation code X’1A’
Logical unit number
7
6
5
4
3
2
1
0
Reserved
Reserved
PC
Control byte
DBD
Page code
Reserved
Allocation length