* Receives messages from CNC control system * Optional function buttons according to user' requirements * Displays data transferred by PLC digital I/O (serial out simulation) or serial I/O (RS232C) * Patent magnetic back cover * Optional enabling micro switches for application * Emergency stop button for option * F type offers 6 key buttons for application extension * Multiple output types suit for various CNC control system * Provides reverse polarity protection * Low-cost total solution with three types of multiple option and combination 1 pc/box