documentclass[tikz]{standalone}
usetikzlibrary{positioning, arrows, fit,calc}

begin{document}
tikzset{computer/.style={shape=rectangle, draw, node distance=-1pt, minimum width = 5em, line width=1pt}}
tikzset{UHD_int/.style={shape=rectangle, draw, node distance=-1pt, minimum width = 7em, line width=1pt}}
tikzset{switch_int/.style={shape=rectangle, draw, node distance=-1pt, minimum width = 7em, line width=1pt}}
tikzset{display/.style={shape=rectangle, draw, node distance=-1pt, minimum width = 8em, line width=1pt}}
tikzset{touchPanel/.style={shape=rectangle, draw, node distance=-1pt, minimum width = 5em, line width=1pt}}
tikzset{mouseKeyboard/.style={shape=rectangle, draw, node distance=-1pt, minimum width = 5em, line width=1pt}}

tikzstyle{line}    = [ draw, -triangle 45 ]

begin{tikzpicture}
  node[computer] (first) {Comp. 1};
  node[computer,below=of first] (second) {Comp. 2};
  node[computer,below=of second] (third) {Comp. 3};
  node[computer,below=of third] (fourth) {Comp. 4};
  node[computer,below=of fourth] (fifth) {Comp. 5};
  node[computer,below=of fifth] (sixth) {Comp. 6};
  node[computer,below=of sixth] (seventh) {Comp. 7};

  node[UHD_int, right=5cm of first] (first_video_in) {HDMI 1};
  node[UHD_int,below=of first_video_in] (second_video_in) {HDMI 2};
  node[UHD_int,below=of second_video_in] (third_video_in) {HDMI 3};
  node[UHD_int,below=of third_video_in] (fourth_video_in) {HDMI 4};
  node[UHD_int,below=of fourth_video_in] (fifth_video_in) {DisplayPort 5};
  node[UHD_int,below=of fifth_video_in] (sixth_video_in) {DisplayPort 6};
  node[UHD_int,below=of sixth_video_in] (seventh_video_in) {RGB/VGA 7};

  node[UHD_int, below=of seventh_video_in] (LAN) {LAN};
  node[touchPanel, below=1.5cm of LAN] (touchPanel) {Touch Panel Controller};
  node[UHD_int, above=of first_video_in] (HDMI_out) {HDMI out};

  node (UHD) [above=0.6cm of first_video_in] {UHD};
  node [draw=black!50, fit={(UHD) (HDMI_out) (first_video_in) (second_video_in)
      (third_video_in) (fourth_video_in) (fifth_video_in) (sixth_video_in) (seventh_video_in) (LAN)}] {};

  node[display, right=2cm of HDMI_out] (display) {big screen};
  draw[->] (HDMI_out) -- (display);

  node[switch_int, left=5cm of first] (first_usb) {USB 1};
  node[switch_int,below=of first_usb] (second_usb) {USB 2};
  node[switch_int,below=of second_usb] (third_usb) {USB 3};
  node[switch_int,below=of third_usb] (fourth_usb) {USB 4};
  node[switch_int,below=of fourth_usb] (fifth_usb) {USB 5};
  node[switch_int,below=of fifth_usb] (sixth_usb) {USB 6};
  node[switch_int,below=of sixth_usb] (seventh_usb) {USB 7};

  node[switch_int, below=of seventh_usb] (USB_mouse/keyboard) {USB 2.0};
  node[mouseKeyboard, below=1.5cm of USB_mouse/keyboard] (mouseKeyboard) {Operator mouse & keyboard};
  node[switch_int, above=of first_usb] (touch_panel_control) {RS-232};

  node (Switch) [above=0.6cm of first_usb] {Switch};
  node [draw=black!50, fit={(Switch) (touch_panel_control) (first_usb) (second_usb)
      (third_usb) (fourth_usb) (fifth_usb) (sixth_usb) (seventh_usb) (USB_mouse/keyboard)}] {};

  draw[->] (first) -- (first_video_in);
  draw[->] (first_usb) -- (first);
  draw[->] (second) -- (second_video_in);
  draw[->] (second_usb) -- (second);
  draw[->] (third) -- (third_video_in);
  draw[->] (third_usb) -- (third);
  draw[->] (fourth) -- (fourth_video_in);
  draw[->] (fourth_usb) -- (fourth);
  draw[->] (fifth) -- (fifth_video_in);
  draw[->] (fifth_usb) -- (fifth);
  draw[->] (sixth) -- (sixth_video_in);
  draw[->] (sixth_usb) -- (sixth);
  draw[->] (seventh) -- (seventh_video_in);
  draw[->] (seventh_usb) -- (seventh);

  draw[->] (mouseKeyboard) -- (USB_mouse/keyboard);
  draw[->] (touchPanel) -- (LAN);

  node[label] at (-3.5,0.3)  {muse/keyboard in};
  node[label] at (3.1,0.3)  {video out};
node [below left=1.7cm of mouseKeyboard] (belowMouseKeyboard) {};
node [left=2.25cm of touch_panel_control] (leftRS232) {};
node [below= of touchPanel] (belowTouchPanel) {};
path [line] (touchPanel.south) -- (belowTouchPanel) -- (belowMouseKeyboard) -- (leftRS232) -- (touch_panel_control);

end{tikzpicture}
end{document}