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A.4 Commands
Appendix A-77
A.4.9 OBJECT POSITION command
The following table shows the normal sequence of the OBJECT POSITION 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 OBJECT
POSITION (CDB)
→
Loads/unloads paper (ADF)
6 STATUS
←
Reports GOOD status
7 MESSAGE IN
←
Reports message (Command
Complete)
Releases BSY signal
8 BUS FREE
(1) OBJECT POSITION command: COMMAND phase (initiator → target)
The OBJECT POSITION command controls the sheets in the ADF. When the ADF is used for
reading, document sheets are loaded with this command before the READ command is issued.
The CDB of this command is shown in the following illustration.