Quantum ATL SuperLoader ATL, User Manual

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Chapter 3 Media Changer Commands
Test Unit Ready Command (00h)
170 Quantum ATL SuperLoader Software Interface Guide
Test Unit Ready Command (00h)
3
The TEST UNIT READY command checks the media changer to
ensure that the unit is ready for commands involving cartridge
movement. If the media changer has successfully completed its
initialization process and the unit is not in an error state, the
command returns a GOOD status. Otherwise, CHECK
CONDITION is reported. Some conditions that would cause a
CHECK CONDITION include overtemperature, no magazines
installed, or user access via front panel or On-board Remote
Management interfaces.
Due to power cycle and code update, it is possible to get multiple
check conditions on a TEST UNIT READY command.
Figure 89 Test Unit
Ready Descriptor
Bit
Byte
7 6 5 4 3 2 1 0
0
Operation Code (00h)
1
Logical Unit Number Reserved
2 - 4
Reserved
5
Unused Reserved Flag Link