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="row1_65535_1ControlType"><xsi:annotation><xsi:documentation>Describes a read-only or read-write Integer Control with restricted range.</xsi:documentation><xsi:documentation>The min value is always 1; the max value can be up to 65,535; and the resolution is always 1.</xsi:documentation></xsi:annotation><xsi:group ref="one_65535_1Group"/><xsi:attributeGroup ref="rw"/><xsi:attributeGroup ref="refID"/></xsi:complexType>