Scanner Interface
Appendix A-24
A.4.2
RELEASE UNIT command
The following table shows the normal sequence of the RESERVE UNIT command when
used with
this scanner.
Step
Bus phase
Initiator operation
← →
Target operation
1
BUS FREE
Verifies bus free
2
ARBITRATION
Obtains bus-usage
right
3
SELECTION
Selects target
→
Drives BSY signal
4
MESSAGE OUT
Selects logical unit
→
5
COMMAND
Specifies RELEASE
UNIT (CDB)
→
6
STATUS
←
Reports GOOD status
7
MESSAGE IN
←
Reports message (Command
Complete)
Releases BSY signal
8
BUS FREE
(1)
RELEASE UNIT command: COMMAND phase (initiator
→
target)
The RELEASE UNIT command releases a reserved status. If this command comes from an
initiator that has not declared reservation, the target ignores the command and responds with
the GOOD status (the reserved status is not released).
The CDB of this command is shown in the following illustration.
Byte 0
Operation code X’17’
2
3
4
5
TP
TPID
(Reserved)
(Reserved)
Control byte
1
7
6
5
4
3
2
1
0
Logical unit number
Summary of Contents for M3097DG
Page 1: ...C150 E103 01EN M3097DG Image Scanner OEM Manual ...
Page 2: ......
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Page 44: ...3 3 Optional image function 3 23 ...
Page 67: ...5 4 Consumable 5 13 Two rollers are included Figure 5 4 Pick roller ...
Page 70: ...6 3 Figure 6 1 Jam clearance ...