Asus AT3IONT-I - Manual (Page 24)

1-15 Chapter 1: Product introduction
8. Serial port connectors (10-1 pin COM1)
The connector is for a serial (COM) port. Connect the serial port module cable to the
connector, then install the module to a slot opening at the back of the system chassis.
The serial port bracket (COM1) is purchased separately.
AT3IONT-I DELUX
E
AT3IONT-I SERIES Serial port (COM1) connector
PIN 1
COM1