The following section details the generic MDISInstrumentObjectType structure and defines the properties associated with it. Additional sections define a subtype MDISInstrumentOutObjectType that allows updates to the instrument value. This is in general a vendor and operator independent description, but all users of the MDISInstrumentObjectType or MDISInstrumentOutObjectType can add vendor specific data. The vendor specific data should be defined as part of a subtype of the MDISInstrumentObjectType defined in this document. It is assumed that the subsea system is the Server and host of the instance of the MDISInstrumentObjectType or MDISInstrumentOutObjectType. The DCS based system is the Client in the system. It is assumed that all interactions with the MDISInstrumentObjectType are initiated by the Client and are directed to the Server.