This unit includes a 1U Rack Shelf Model ST-RMK.
(x2) Crestron ST-COM RS232-422,, 2 COM Control Port Module, allow for two bi-directional Comm Ports to control a multitude of various devices such as Video Decks, Audio Decks, Ligthing Systems, and more. Anything requiring control via RS232 or 422 can be controlled using this device.