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A.4 Commands
Appendix A-25
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.