Send Diagnostic Command (1Dh) - Quantum DLT 8000 Product Manual

SCSI Commands

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 7
Byte
0
1 Logical Unit Number
2
(MSB)
3 - 4
5 Unused
Figure 5–97 SEND DIAGNOSTIC Command Descriptor Block — Data Format
Table 5–94 SEND DIAGNOSTIC Command Data — Field Descriptions
Field Name
PF
Selftst
DevOfl
UnitOfl
5-210
6 5
Operation Code (1Dh)
PF (0)
Description
Page Format. Not supported; must be 0.
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.
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.
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.
Quantum DLT 8000 Tape System
4 3
Rsv'd Selftst
Reserved
Reserved
Reserved
2 1
DevOfl UnitOfl
Flag Link
0
(LSB)