4-3.28 Send Diagnostic (Factory Mode) Command 1Dh; 4-3.28.1 Send Diagnostic Cdb Description; Table 4-114. Send Diagnostic (Factory Mode) Field Description - Fujitsu M2488 Product Manual

TAPE UNIT SCSI COMMANDS
4-3.28 SEND DIAGNOSTIC (FACTORY MODE) command 1Dh
The SEND DIAGNOSTIC (FACTORY MODE) command requests the target to perform diagnostic
tests on itself, or on the attached peripheral devices. After the receipt of a valid SEND DIAGNOSTIC
command, the unit performs synchronization prior to execution of the SEND DIAGNOSTIC opera-
tion. Disconnection occurs, if allowed, during the execution of the function. When the self-test bit is
zero, this command is usually followed by a RECEIVE DIAGNOSTIC RESULTS command.
The SEND DIAGNOSTIC command as described in this section
requires that the tape drive be set in FACTORY MODE.
4-3.28.1 SEND DIAGNOSTIC CDB Description
SEND DIAGNOSTIC is a six-byte command. The bytes are shown below and described in
Table 4-114. Common fields are described in paragraph 4-3.1 on page 4-4.
BYTES 7
0 0
1
2
3 MSB
4
5
Note: Changeable fields in the CDB are shaded.
The following Field Description table specifies the use of each field of the SEND DIAGNOSTIC
CDB. Refer to Table 4-115 in conjunction with the following table for a more concise overview of
how each field is used.

Table 4-114. SEND DIAGNOSTIC (FACTORY MODE) Field Description

BYTE BIT VALUE
0 0-7 1Dh
1 0
1 1
1 2
4-124
** NOTE **
6 5 4
0 0 1
LUN PF
Parameter List Length
Reserved
Operation code.
1 A UnitOfL (Unit Offline) bit of 1 enables write operations on user medium or opera-
tions that affect user visible medium positioning.
1 A DevOfL (Device Offline) bit of 1 enables diagnostic operations that may adversely
affect operations to other logical units on the same target.
1 A Selftest bit of 1 directs the target to complete its default selftest.
0 A Selftest bit of 0 directs the target to perform tests defined by the bytes in the
parameter list. Successful completion of the function and preparation of a response is
indicated by presentation of GOOD status. The response is then recovered by execu-
tion of the RECEIVE DIAGNOSTIC RESULTS command.
CG00000-011503 REV. A
M2488 PRODUCT GUIDE
BITS
3 2
1 1
Reserved Selftest
Reserved
DESCRIPTION
1 0
0 1
DevOfL UnitOfL
LSB
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April 1997