Integer representing the threshold type,
this is usually the same as resource type.
Integer representing the threshold type:
3009 = String
3010 = Sbit32 (signed 32 bit integer)
3011 = Ubit32 (unsigned 32 bit integer)
3012 = Sbit64 (future use)
3013 = Ubit64 (future use)
3014 = Float64 (64 floating point number)
3015 = Enumerated Type
3016 = Error
Not applicable if operator is poll or change; or if Resource Type is Error
Note: enumerated type is not supported as threshold type.