LAN switch and twice RS-232:
![](project_images/smallpc_images/hub6a.gif)
The RS-232 signals are connected to the indicator / selector board.
![](project_images/smallpc_images/hub5.gif)
The USB switch allows for sharing of peripherals, above all keyboard and mouse. A cable has been added connecting the pushbutton and LED signals to the adapter board within the subrack.
This module comprises two USB hubs, one for each tablet.
![](project_images/smallpc_images/hub1.gif)
The power supply module:
![](project_images/smallpc_images/netz1.gif)
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