RS485 Modbus RTU Interface Micromodule for N20K48 Modular Process Controller. The CG-485 ClickNGo Module with RS485 interface was designed to work as an expansion module for NOVUS line of modular controllers. CG-485 must be attached to the controller dock (Part#: NV-820KCG00DK). Once inserted, it will be automatically recognized. Its configuration parameters will be displayed according to the slot in which the module has been attached to the dock. You can configure this module directly at the controller, through the QuickTune software, or through the QuickTune Mobile.