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6.3
REQUEST SENSE (03 H )
BIT
BYTE
00
01
Logical Unit Number
I
Reserved
(0 )
02
Reserved
(0)
03
Reserved
(0)
04
Allocation Length
05
Reserved (0)
I
Flag
I
Link
Figure 6-3.
REQUEST SENSE Command
This command returns unit sense.
The sense data will be valid for the CHECK status condition sent
to the Host and will be saved by the controller until requested.
Sense data will be cleared on receiving a subsequent command
to
the LUN related
to
the
check
condition
from
the
Host
that
received the check condition.
Other hosts will receive BUSY
status to commands for a LUN with non-zero sense to report.
Therefore, CHECK status should always be followed by a SENSE
Command.
The ACB-5500 returns 4 bytes of sense information in response to
this command.
The number of bytes should equal 134, however,
values of 00, 01, 02, and 03 will default to 04.
The REQUEST SENSE command is the most important mechanism for
informing the host of abnormal states discovered by the ACB-5500.
BIT
BYTE
07
06
05
04
03
02
01
00
------1------1------1------ ------1------1------1------
AdrVal
Error Class
Error Code (See Tables)
01
------I----~--------
------ ---------------------------
Reserved (0)
(MSB)
Logical Block Address
02
Loglcal Block Address
03
Logical Block Address
(LSB)
Figure 6-4.
REQUEST SENSE Data
500504-00
6-5
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