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4.4.5
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
¨ Æ
Target operation
1
BUS FREE
Verifies bus free
2
ARBITRATION
Obtains bus
>
usage
right
3
SELECTION
Selects target
Æ
Drives BSY signal
4
MESSAGE OUT
Selects logical unit
Æ
5
COMMAND
Specifies SEND
DIAGNOSTIC
(CDB)
Æ
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 Æ 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.
4
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Summary of Contents for M3093DG
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