Read Command - Fujitsu M3096GX Instruction Manual

4.4.11 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
(1) READ command: COMMAND phase (initiator Æ 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.
Initiator operation
Verifies bus free
Obtains bus>usage
right
Selects target
Selects logical unit
Specifies READ
(CDB)
¨ Æ Target operation
Æ
Drives BSY signal
Æ
Æ Reads document
¨ Transfers image data
¨ Reports GOOD status
¨ Reports message (Command
Complete)
Releases BSY signal
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