FUJITSU M3093DG - Manual (Page 82)

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.
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