Request Sense; Command Description; Command Descriptor Block - Tandberg Data SLR7-140 PROGRAMMER Manual

23.
BYTE BIT 7
00 Operation Code 03h
01 Logical Unit Number (LUN)
02 RESERVED
03 RESERVED
04 Allocation Length
05 Control Byte
Table 23-1:
Allocation Length

Request Sense

23.1. Command Description

The REQUEST SENSE
transfer sense data to the Initiator.
The sense data will be valid for a CHECK CONDITION
returned on the prior command. This sense data will be
preserved by the Drive for the Initiator until retrieved
by the REQUEST SENSE command or until the receipt of any
other command from the Initiator that issued the command
resulting in the CHECK CONDITION status.
The REQUEST SENSE
Initiator specifies an unsupported LUN (LUN field in the
Command Descriptor Block or IDENTIFY message is not set
to zero). In this situation other pending sense data
will be cleared and the transferred Parameter List will
reflect the Unsupported LUN condition.
The REQUEST SENSE command will execute normally even if
a reservation conflict exists.
The Drive will never disconnect for this command.

23.2. Command Descriptor Block

6 5
REQUEST SENSE Command Descriptor Block
This field specifies
allocated by the
Allocation Length is zero, the Drive will not return any
sense data. For any other Allocation Length value, the
Drive terminates
Length bytes have been transferred or when all available
sense data have
whichever is less.
23-1 Tandberg SLR Product Line SCSI Functional Specifications
command requests
command will
4 3
RESERVED
the maximum
Initiator for
the DATA-IN phase
been transferred
that the
execute even if
2 1
number of bytes
sense data. If
when Allocation
to the Initiator,
Drive
the
0
the