When using the PEX server, you can attach one of the following special input devices to the serial port: a Summagraphics-compatible digitizing tablet or a Logitech 3D mouse. If you are using one of these input devices:

• Make sure the input device is specified in the xserver-input-extension-device parameter (Setup -> Change Setup Parameters -> Input Devices -> Input Extension Device). This parameter is not saved in NVRAM.

  Table 14-25 xserver-input-extension-device Parameter

  Possible Values	Results
  default	tablet
  tablet	Specifies a Summagraphics-compatible digitizing tablet.
  3d-mouse	Specifies a Logitech 3D mouse.

  
  

• Set the mode of the serial port to "input-device" in the serial-interfaces-table parameter (Setup -> Change Setup Parameters -> Serial -> Serial Interfaces Table). This parameter is saved in NVRAM.
  
  For example:
  

  
  serial-interfaces-table = {1 input-device input-device 9600 8 1 none none none}