21 send diagnostic command (1dh) – Quantum Instruments DLT 7000 User Manual
Page 262
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.