Supermicro SuperServer SYS-E102-9AP-LN4-E User Manual page 33

Battery Connector
BT1 is a two-pin connector for an external CMOS battery. This connector is also used to clear
the CMOS. To clear the CMOS, remove the battery, short pins 1-2 for more than 10 seconds
and then install the battery.
COM Header
The motherboard has one COM header (COM1) that supports RS-232.
SATA Port
The A2SAN-LN4-E/-C motherboard has one I-SATA 3.0 port. Refer to the table below for pin
definitions.
M.2 Slots
The A2SAN-LN4-E/-C motherboard has four M.2 slots. M.2 was formerly known as Next
Generation Form Factor (NGFF). M.2 allows for a variety of card sizes, increased functionality,
and spatial efficiency. The M.2 slots at JMD1, JMD2 and JMD3 support B-Key (USB2.0/3.0
with Nano SIM for LTE/3G) modules in a 2242/3042 form factor. JDM1 supports SATA upon
request. The M.2 slot at JMD4 supports E-Key (PCIe x1/USB2.0 with WiFi + BT) modules in
a 2230 form factor. Refer to the following pages for M.2 pin definition tables.
COM Header (COM1)
Pin Definitions
Pin# Description Pin# Description
1 DCD 6 DSR
2 RXD 7 RTS
3 TXD 8 CTS
4 DTR 9 RI
5 Ground 10 N/A
SATA 3.0 Port
Pin Definitions
Pin# Signal
1 Ground
2 SATA_TXP
3 SATA_TXN
4 Ground
5 SATA_RXN
6 SATA_RXP
7 Ground
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Chapter 4: Motherboard Connections