Abstract: This disclosure includes embodiments of a subsea open standard (SOS) control system and methods of operating and expanding the same that are suitable for controlling subsea production equipment directly from a topsides master control station (MCS). For example, this disclosure includes a network using an open and non-propriety networking protocol to send and receive control commands directly between the MCS and a subsea networked end device having a unique network address via a subsea network router module (SRM).