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User’s Guide 21020285 D
Chapter 7 Board-control Commands
Unit Options (08H) Page 7 - 23
If the Sense Count field is set to 0, but there are non-zero values in the Selected
Sense bytes fields, the byte numbers and order you define in the Selected Sense
Bytes fields are used to return automatic Request Sense information for this
device.
Example Use of Selected Sense Bytes Fields
In this example your device has valuable information, in bytes other than the
first eight, that you wish to substitute:
• Byte 12 is an Additional Sense Code.
• Bytes 15 through 17 include additional error information.
Assume bytes 16 and 17 are pointers that you wish to read in as a word. You
will arrange them in the group of Sense Bytes to make this easy. For the
example, the Sense Count field must be set to zero. The Selected Sense Bytes
fields of the Unit Options command would look like this:
Address
Offset
Byte Memory Address
Offset + 0 Offset + 1 Offset + 2 Offset + 3
00H Command Identifier
04H Disconnect Time-out Unit SCSI ID Adapter ID = FFH
08H Select Time-out Retry Control Retry Limit
0CH Reserved Reserved Sense Count = 0 Unit Flags
10H Command = 08H Reserved
14H 0H (Class/Code) 01H (Segment) 02H (SCSI Flags) 03H (Info Byte)
18H 0CH (Byte 12) 0FH (Byte 15) 11H (Byte 17) 10H (Byte 16)
Table 78: Example Selection of Sense Bytes