4-46
4.4.8.3
ADF sequence
Read on ADF
Read on FB
(Load object)
(Unload object)
Note
If the document is shorter than the window area specified by the SET WINDOW command, the deficient portion is
supplemented by white data. The deficient portion is supplemented so that the data covers the entire specified window area
and is transferred.
4.4.9
READ command
The following table shows the normal sequence of the READ command when used with this scanner.
Table 4-21
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
←
Transfer image data
7
STATUS
←
Reports GOOD status
8
MESSAGE IN
←
Reports message (Command Complete)
Releases BSY signal
9
BUS FREE
OBJECT POSITION command
READ command
READ command
OBJECT POSITION command