Right angle side, 6 chapter 4: motherboard info, Com port connector – Asus V3-M2NC61S User Manual
Page 56: Com2 the com module is purchased separately, Sata connectors

4-6
Chapter 4: Motherboard info
3. Serial ATA connectors (7-pin SATA1, SATA2)
These connectors are for the Serial ATA signal cables for Serial ATA
hard disk drives.
Connect the right-angle side
of SATA signal cable to SATA
device. Or you may connect
the right-angle side of SATA
cable to the onboard SATA
port to avoid mechanical
conflict with a long card in
PCI2 slot.
right angle side
R
SATA Connectors
G
ND
RS
AT
A_
TX
P1
RS
AT
A_
TX
N1
G
ND
RS
AT
A_
RX
P1
RS
AT
A_
RX
N1
G
ND
G
ND
RS
AT
A_
TX
P2
RS
AT
A_
TX
N2
G
ND
RS
AT
A_
RX
P2
RS
AT
A_
RX
N2
G
ND
SATA1
SATA2
4. Serial port connector (10-1 pin COM2)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the
back of the system chassis.
R
M2N-NM
COM Port Connector
PIN 1
COM2
The COM module is purchased separately.