Fujitsu M3097DG Oem Manual page 157

A.4.11 READ command
The following table shows the normal sequence of the READ 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
READ command: COMMAND phase (initiator → target)
(1)
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.
Initiator operation
Verifies bus free
Obtains bus-usage
right
Selects target
Selects logical unit
Specifies READ
(CDB)
← →
Target operation
→
Drives BSY signal
→
→
Reads document
←
Transfers image data
←
Reports GOOD status
←
Reports message (Command
Complete)
Releases BSY signal
A.4 Commands
Appendix A-87