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Appendix A-46
A.4.5 SEND DIAGNOSTIC command
The following table shows the normal sequence of the SEND DIAGNOSTIC 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 SEND
DIAGNOSTIC
(CDB)
→
Performs self-test
6 STATUS
←
Reports GOOD status
7 MESSAGE IN
←
Reports message (Command
Complete)
Releases BSY signal
8 BUS FREE
(1) SEND DIAGNOSTIC command: COMMAND phase (initiator → target)
The SEND DIAGNOSTIC command is used by an initiator to request a target or logical unit for
self-test. Two types of self-diagnostic are: (a) the self-test performed by the unit itself, and (b) the
test conducted according to the instruction data from the initiator.
This scanner supports the self-test only.
The results of self-test are reported using the status and sense data.
The CDB of this command is shown in the following illustration.