Asus DN-300-R2 Manual page 24

8. M.2 socket 3
This socket allows you to install an M.2 (NGFF) SSD module.
DN-300-R2 M.2 socket
NOTES:
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9. Serial port connectors (12-1 pin COM2, COM3, COM4, COM5, COM6)
These connectors are for serial (COM) ports. Connect the serial port cables
to these connectors, then install the module to a slot opening at the back of
the system chassis.
DN-300-R2 Serial port (COM) connectors
NOTE: The serial port cables are purchased separately.
2-18
2280
The M.2 SSD module is purchased separately.
This socket supports M Key and 2260/2280 SATA mode storage devices.
M.2(SOCKET3)
2260
COM2~6
PIN 1
DN-300-R2