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SCSI Commands
5-158 Quantum DLT 7000 Tape System
5.21 SEND DIAGNOSTIC COMMAND (1Dh)
The SEND DIAGNOSTIC command directs the tape drive to perform its self-
diagnostic tests.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (1Dh)
1 Logical Unit Number PF (0) Rsv’d Selftst DevOfl UnitOfl
2 - 4 Reserved
5 Unused Reserved Flag Link
Figure 5–76 SEND DIAGNOSTIC Command Descriptor Block - Data Format
Table 5–75 SEND DIAGNOSTIC Command Data - Field Descriptions
Field Name Description
PF Page Format. Not supported; must be 0.
Selftst Self Test. This bit is used in conjunction with DevOfl and UnitOfl to specify the type
of testing to be done. An explanation is provided in the following paragraphs.
DevOfl Device Offline. This bit is used in conjunction with Selftst and UnitOfl to specify
the type of testing to be done. An explanation is provided in the following
paragraphs.
UnitOfl Unit Offline. This bit is used in conjunction with Selftst and DevOfl to specify the
type of testing to be done. An explanation is provided in the following paragraphs.