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(d) A bit and field described as "Reserved" are 0.
If this scanner receives a value other than 0, it returns an error as follows:
Status key: B'00001 '(CHECK CONDITON)
Sense key: X~5'(ILLEGAL REQUES~I)
The commands supported by this scanner are listed below.
Command
RESERVE UNIT
RELEASE UNIT
INQUIRY
REQUEST SENSE
SEND DIAGNOSTIC
TEST UNIT READY
SET WINDOW
OBJECT POSITION
READ
SCAN
4.4.1 RESERVE UNIT command
The following table shows the normal sequence of the RESERVE UNIT command when used with this scanner.
Step
Bus phase
1
BUS FREE
2
ARBITRATION
3
SELECTION
4
MESSAGE OUT
5
COMMAND
6
STATUS
7
MESSAGE IN
8
BUS FREE
Table 4-7
Operation
code (hex)
16
Declares the exclusive use of a logical unit
17
Cancels the declaration of the exclusive use of a logical unit
12
Examines the information regarding the target and logical unit
03
Requests a target for sense data
ID
Requests a target for self-check
00
Checks whether or not a logical unit is ready
24
Sets a window
31
Controls the automatic document feeder
28
Requests transfer of image data
1B
Requests the target to begin a scan operation
Table 4-8
RESERVE UNIT command
Initiator operation
Verifies bus free
Obtains bus-usage right
Selects target
Selects logical unit
Specifies RESERVE UNIT (CDB)
4-19
Commands
Description
← ← → →
→
→
→
←
Target operation
Drives BSY signal
Reports GOOD status
Reports message
(Command complete)
Releases ESY signal
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