Chapter 9
Item type
Global
Item function
Usage Page
Logical Minimum
Description
Identifies a function available within the device.
Defines the lower limit of the reported values in logical units.
9
Logical Maximum
Defines the upper limit of the reported values in logical units.
Physical Minimum
Physical Maximum
Unit Exponent
Unit
Report Size
Report ID
Report Count
Push
Pop
Defines the lower limit of the reported values in physical units, that is the
Logical Minimum expressed in physical units.
Defines the upper limit of the reported values in physical units, that is the
Logical Maximum expressed in physical units.
Indicates the unit exponent in base 10. The exponent ranges from -8 to +7.
Indicates the unit of the reported values. For instance, length, mass,
temperature units, etc.
Indicates the size of the report fields in bits.
Indicates the prefix added to a particular report.
Indicates the number of data fields for an item.
Places a copy of the global item state table on the CPU stack.
Replaces the item state table with the last structure from the stack.
Local
Usage
Usage Minimum
Usage Maximum
Designator Index
Designator Minimum
Designator Maximum
String Index
String Minimum
String Maximum
Delimiter
Represents an index to designate a specific Usage within a Usage Page. It
indicates the vendor’s suggested use for a specific control or group of
controls. A usage supplies information to an application developer about
what a control is actually measuring.
Defines the starting usage associated with an array or bitmap.
Defines the ending usage associated with an array or bitmap.
Determines the body part used for a control. Index points to a designator in
the Physical descriptor.
Defines the index of the starting designator associated with an array or bitmap.
Defines the index of the ending designator associated with an array or bitmap.
String index for a String descriptor. It allows a string to be associated with a
particular item or control.
Specifies the first string index when assigning a group of sequential strings
to controls in an array or bitmap.
Specifies the last string index when assigning a group of sequential strings
to controls in an array or bitmap.
Defines the beginning or end of a set of local items.
Table 9-2 Item’s Function Description for each Item Type
138
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