Used to indicate the read-write support level for the Control.
RO means the CUR Property is implemented as Read-Only and the NEXT Porperty is not implemented.
RON means the CUR Property is implemented as Read-Only and the NEXT Porperty is implemented (always Read-Write).
RW means the CUR Property is implemented as Read-Write and the NEXT Porperty is not implemented.
RWN means the CUR Property is implemented as Read-Write and the NEXT Porperty is implemented (always Read-Write).
Source
<xsi:complexType name="rowUnsignedIntControlType"><xsi:annotation><xsi:documentation>Describes a read-only or read-write Integer Control with restricted ranges.</xsi:documentation><xsi:documentation>Multiple range elements are supported, as well as a valueList element.</xsi:documentation><xsi:documentation>min and max elements have a range [0..2,147,483,647]</xsi:documentation><xsi:documentation>res element has a range [1..2,147,483,647]</xsi:documentation></xsi:annotation><xsi:group ref="UnsignedIntGroup"/><xsi:attributeGroup ref="rw"/><xsi:attributeGroup ref="refID"/></xsi:complexType>