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C141-E167 3 -
1
CHAPTER 3 Command Specifications
3.1 Control/Sense Commands
3.2 Data Access Commands
3.3 Format Commands
3.4 Maintenance, Diagnostic Commands
This chapter describes detailed specifications of the SCSI commands which the IDD is equipped with and
how to use them.
3.1 Control/Sense Commands
3.1.1 TEST UNIT READY (00)
Bit
Byte
76543210
0 X‘00’
1 LUN 00000
200000000
300000000
400000000
50000000Link
This command checks the status of the disk drive. This command is executed immediately without
queueing in a system which issues only commands with no tags or links.
If the IDD is in the ready state and it is possible for it to be used by the application client which
issues this command, a GOOD status is reported for this command.
If the IDD is not in the ready state, it reports a CHECK CONDITION status for this command. The
sense data generated at this time indicate the IDD's state at this time.