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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 commandREAD command
OBJECT POSITION command