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4.4.9 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 ¨ Æ Target operation
1 BUS FREE Verifies bus free
2 ARBITRATION Obtains bus>usage
right
3 SELECTION Selects target Æ
Drives BSY signal
4 MESSAGE OUT Selects logical unit Æ
5 COMMAND Specifies OBJECT
POSITION (CDB)
Æ 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 Æ 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.
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