Asus P7H55-M PLUS - Manual (Page 25)

10. Serial port connectors (10-1 pin COM2) (for P7H55-M LE and P7H55-M LX only)
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 (COM2) is purchased separately.
P7H55-M LE
P7H55-M LE Serial port (COM2) connector
PIN
1
COM2
1-16 ASUS P7H55-M LE Series