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Chapter 4: Motherboard Connections
Internal Speaker/Buzzer
The Internal Speaker/Buzzer (SP1) is used to provide audible indications for various beep
codes. Refer to the table below for pin definitions.
Internal Buzzer
Pin Definitions
Pin#
Definition
1
Pos (+) Beep In
2
Neg (-) Alarm Speaker
Required Connection
CMOS Battery Connector
Pin Definitions
Pin#
Definition
1
VBAT
2
Ground
Extended CMOS Battery Connector
J18 is a power connector that provides additional power to maintain the CMOS data with an
external battery. Refer to the table below for pin definitions.
M.2 M-Key Temperature Sensor
ART1 is the M-Key temperature senor.
COM Header
The motherboard has one COM header that provides two serial connections (COM1/2) and
supports RS-232 function, utilizing Supermicro PN: CBL-CDAT-0604 (not included).
COM Header (COM1/2)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
DCD3
2
DSR3
3
RXD3
4
RTS3
5
TXD3
6
CTS3
7
DTR3
8
RI3_N
9
GND
10
N/A
11
DCD4
12
DSR4
13
RXD4
14
RTS4
15
TXD4
16
CTS4
17
DTR4
18
RI4_N
19
GND
20
N/A