Supermicro SuperServer E300-9A-4CN10P - Page 33

33
Chapter 3 Motherboard Connections
COM Header
The motherboard has one COM header for front access to provide a serial connection.
COM Header
Pin Denitions
Pin# Denition Pin# Denition
1 DCD 6 DSR
2 RXD 7 RTS
3 TXD 8 CTS
4 DTR 9 RI
5 Ground 10 N/A
Universal Serial Bus (USB) Ports
There are three USB 3.1 Gen 1 Type-A (USB0/1 rear and USB4 header) and one USB 2.0
header (USB2/3). The onboard header can be used to provide front side USB access with a
cable (not included). USB 3.1 Gen 1 is also referred to as USB 3.0
Type A USB 3.1 Gen 1
Pin Denitions
Pin# Denition
1 VBUS
2 D-
3 D+
4 Ground
5 StdA_SSRX-
6 StdA_SSRX+
7 GND_DRAIN
8 StdA_SSTX-
9 StdA_SSTX+
UID Button
Pin Denitions
Pin# Denition
1 Ground
2 Ground
3 Button In
4 Button In
UID LED
Pin Denitions
Color Status
Blue: On 
Unit Identier Button/UID LED Indicator
              
button (JUIDB) is located next to the VGA port on the back panel. The UID LED is located at
UIDLED1, next to the UID button. When you press the UID button, the UID LED will be turned
󰀨

Note: UID can also be triggered via IPMI on the motherboard. For more information
on IPMI, please refer to the IPMI User's Guide posted on our website at https://www.
supermicro.com/support/manuals/.
USB 2.0 Header (USB2/3)
Pin Denitions
Pin# Denition Pin# Denition
1 +5V 6 +5V
2 USB_N 7 USB_N
3 USB_P 8 USB_P
4 Ground 9 Ground
5 Key 10 NC