A.4 Commands

a.TP (third party): Byte 1

As this scanner does not support the 3rd party reservation option, setting this bit to 1 causes the target to return the following error information:

Status:

B’00001’ (CHECK CONDITION)

Sense key: X’5’ (ILLEGAL REQUEST)

b.TPID (third party device ID): Byte 1 This scanner ignores TPID.

A.4.3 INQUIRY command

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

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 INQUIRY

 

 

 

(CDB)

 

 

 

 

 

 

 

6

DATA IN

 

Reports inquiry data

 

 

 

 

 

7

STATUS

 

Reports GOOD status

 

 

 

 

 

8

MESSAGE IN

 

Reports message (Command

 

 

 

 

Complete)

 

 

 

 

 

 

 

 

 

Releases BSY signal

 

 

 

 

 

9

BUS FREE

 

 

 

 

 

 

 

 

(1)INQUIRY command: COMMAND phase (initiator target)

The INQUIRY command used to check information regarding a target and logical unit. The CDB of this command is shown in the following illustration.

Appendix A-25