
Chapter 3 Media Changer Commands
Log Sense Command (4Dh)
Quantum ATL SuperLoader Software Interface Guide 47
Table 16 Log Sense
Command Descriptor
Block
Field Name Description
PPC Parameter Pointer Control. A PPC of 0 indicates that the parameter data
requested from the device starts with the parameter code specified in the
Parameter Pointer field (Bytes 5 - 6) and returns the number of bytes specified
in the Allocation Length field (Bytes 7 - 8) in ascending order of parameter
codes from the specified log page. Request for changed parameters is not
supported. This field must be 0.
SP Save Parameters. Not supported, must be set to 0. If for some reason the Save
Parameters bit is set, the command terminates with a CHECK CONDITION
status with a sense key of ILLEGAL REQUEST and an ASC of INVALID FIELD
IN CDB.
PC Page Control. This field defines the type of parameter values to be returned:
PC Type of Parameter Values
00b Threshold Values
01b Cumulative Values
10b Default Threshold Values
11b Default Cumulative Values
The Default Threshold Values are the maximum values that each parameter
can attain.
The Current Cumulative Values are the values computed since the last reset of
the device (either via power-cycle, BUS DEVICE RESET, or SCSI RESET.)
The Default Cumulative Values are the values to which each parameter is
initialized at a reset condition. Default values are zero.
By default, Current Threshold Values = Default Threshold Values.
Page Code The Page Code field identifies which log page is being requested by the
initiator. If the page is not supported, then the command terminates with a
CHECK CONDITION status, sense key set to ILLEGAL REQUEST, and
additional sense code of INVALID FIELD IN CDB. Supported pages are:
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