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SCSI Commands
5-210 Quantum DLT 8000 Tape System
5.27 SEND DIAGNOSTIC Command (1Dh)
The SEND DIAGNOSTIC command directs the tape drive to perform its self-diagnostic
tests. It can also be used to invoke the Basic Health Check (BHC) diagnostic test. Note
that the BHC feature is provided for use only by a trained service provider.
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 Reserved
3 - 4
(MSB)
Reserved
(LSB)
5 Unused Reserved Flag Link
Figure 5–97 SEND DIAGNOSTIC Command Descriptor Block — Data Format
Table 5–94 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.
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