Asus PN42 Series User Manual page 18

HDMI port
The HDMI (High Definition Multimedia Interface)
port supports an 4K device, such as an LCD TV
or monitor, to allow viewing on a larger external
display.
NOTE: When using only this port as
a display output source, this port will
support a resolution of up to 4096 x
2160 @60Hz. The resolution may also be
affected by the cabling and output device.
Serial (COM) connector
The 9-pin serial (COM) connector allows you to
connect devices that have serial ports such as
mouse, modem, or printers.
VGA port
This port allows you to connect your Mini PC to
an external display.
NOTE: When using only this port as
a display output source, this port will
support a resolution of up to 1920 x
1200 @60Hz. The resolution may also be
affected by the cabling and output device.