Fujitsu 600C manual RESERVE UNIT command, d A bit and field described as Reserved are, 7 Commands

Models: 600C

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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.

 

 

Table 4-7 Commands

 

 

 

 

Operation

 

Command

code (hex)

Description

 

 

 

 

 

 

RESERVE UNIT

16

Declares the exclusive use of a logical unit

RELEASE UNIT

17

Cancels the declaration of the exclusive use of a logical unit

 

 

 

INQUIRY

12

Examines the information regarding the target and logical unit

 

 

 

REQUEST SENSE

03

Requests a target for sense data

SEND DIAGNOSTIC

ID

Requests a target for self-check

 

 

 

TEST UNIT READY

00

Checks whether or not a logical unit is ready

 

 

 

SET WINDOW

24

Sets a window

OBJECT POSITION

31

Controls the automatic document feeder

 

 

 

READ

28

Requests transfer of image data

 

 

 

SCAN

1B

Requests the target to begin a scan operation

4.4.1RESERVE UNIT command

The following table shows the normal sequence of the RESERVE UNIT command when used with this scanner.

Table 4-8RESERVE UNIT command

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 RESERVE UNIT (CDB)

 

6

STATUS

 

 

Reports GOOD status

7

MESSAGE IN

 

Reports message

 

 

 

 

(Command complete)

 

 

 

 

Releases ESY signal

8

BUS FREE

 

 

 

4-19

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Fujitsu 600C manual RESERVE UNIT command, d A bit and field described as Reserved are, 7 Commands, Operation, code hex