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Super A3SEV-2C/4C-LN4 User's Manual
COM Headers
The motherboard has two COM headers that provide four serial connections (COM1/2 and
COM3/4). These headers support the RS-232/422/485 function. Please utilize Supermicro
PN: CBL-CDAT-0685 to bridge out these serial connections.
COM1/2 Header
Pin Definitions
Pin#
Definition
1
DCD1
3
RXD1
5
TXD1
7
DTR1
9
GND
11
DCD2
13
RXD2
15
TXD2
17
DTR2
19
GND
MH1
VGA
AUDIO FP
JPL4
JPL4:
1-2:ENABLE
2-3:DISABLE
JPAC1
JEDP1
JSMB1
U2
JSIM1
JMD2_SRW1
1
19
30
2
JMD1
JMD2
M.2-H PCI-E 3.0 X2/I-SATA0 M.2-P PCI-E 3.0 X1
USB2/3
19
USB4/5
BT1
JGP1
I-SATA1
2
LED2
JTPM1
Pin#
Definition
2
DSR1
4
RTS1
6
CTS1
8
RI1_N
10
N/A
12
DSR2
14
RTS2
16
CTS2
18
RI2_N
20
N/A
USB0/1
USB6/7(3.1)
LAN3/4
LAN1/2
CPU
JBT1
JPME2
JPME2:
A3SEV-2C-LN4
1-2:NORMAL
2-3:ME MANUFACTURING MODE
BAR CODE
REV:1.00
DESIGNED IN USA
DIMMA1
DIMMB1
JSD1
SATA
DOM
POWER
JF1
PWR
NIC
NIC
HDD
PWR
RST
X OH/FF
ON
2
1
L
D E
L
D E
36
COM3/4 Header
Pin Definitions
Pin#
Definition
Pin#
1
DCD3
2
3
RXD3
4
5
TXD3
6
7
DTR3
8
9
GND
10
11
DCD4
12
13
RXD4
14
15
TXD4
16
17
DTR4
18
19
GND
20
1. COM1/2
2. COM3/4
HDMI/DP
MH2
2
JITP1
59
BIOS LICENSE
2
JPV1
FAN1
MH4
Definition
DSR3
RTS3
CTS3
RI3_N
N/A
DSR4
RTS4
CTS4
RI4_N
N/A
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