A.4 Commands
Appendix A-87
A.4.11 READ command
The following table shows the normal sequence of the READ 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 READ
(CDB)
→
Reads document
6
DATA IN
←
Transfers image data
7
STATUS
←
Reports GOOD status
8
MESSAGE IN
←
Reports message (Command
Complete)
Releases BSY signal
9
BUS FREE
(1)
READ command: COMMAND phase (initiator
→
target)
The READ command is used by an initiator to request a target for transfer of data. Upon receiving
this command, the target returns scan data to the initiator.
The CDB of this command is shown in the following illustration.
Summary of Contents for M3097DG
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