Fujitsu M3097DG Oem Manual page 111

A.4.4 REQUEST SENSE command
The following table shows the normal sequence of the REQUEST SENSE command when used
with this scanner.
Step Bus phase
1 BUS FREE
2 ARBITRATION
3 SELECTION
4 MESSAGE OUT
5 COMMAND
6 DATA IN
7 STATUS
8 MESSAGE IN
9 BUS FREE
REQUEST SENSE command: COMMAND phase (initiator → target)
(1)
The REQUEST SENSE command requests the sense data that shows the status of a logical unit. On
receiving this command, the target sets the unit•fs status in the sense data and returns it to the
initiator.
The CDB of this command is shown in the following illustration.
7
Byte 0
1 Logical unit number
2
3
4
5
Initiator operation
Verifies bus free
Obtains bus-usage
right
Selects target
Selects logical unit
Specifies REQUEST
SENSE (CDB)
6 5 4
Operation code X'03'
Allocation length
Control byte
← →
→
Drives BSY signal
→
→
←
Reports sense data
←
Reports GOOD status
←
Reports message (Command
Complete)
Releases BSY signal
3 2
(Reserved)
(Reserved)
A.4 Commands
Target operation
1 0
Appendix A-41