Supermicro SuperServer SYS-111C-NR - Page 59

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Chapter 4: Motherboard Connections
Universal Serial Bus (USB) Ports
The motherboard has two USB 2.0 headers (USB0/1), and two USB 3.2 Gen 1 ports (USB2/3)
on the I/O back panel. The onboard headers can be used to provide front side USB access
with a cable (not included).
Front Panel USB0/1 (2.0) Headers
Pin Denitions
Pin# Denition Pin# Denition
1 +5V 2 +5V
3 USB_N 4 USB_N
5 USB_P 6 USB_P
7 Ground 8 Ground
9 Key 10 NC
Back Panel USB2/3 (USB 3.2 Gen 1)
Pin Denitions
Pin# Denition Pin# Denition
A1 VBUS B1 VBUS
A2 USB_N B2 USB_N
A3 USB_P B3 USB_P
A4 GND B4 GND
A5 Stda_SSRX- B5 Stda_SSRX-
A6 Stda_SSRX+ B6 Stda_SSRX+
A7 GND B7 GND
A8 Stda_SSTX- B8 Stda_SSTX-
A9 Stda_SSTX+ B9 Stda_SSTX+
Unit Identier Switch (UID-SW): One button with two functions

UID switch is located next to the VGA port on the back panel.
UID Switch
Pin Denitions
Pin# Denition
1 Button In
2 Ground
G1 Ground
G2 Ground
UID LED
Pin Denitions
Color Status
Blue: On 
Note: After pushing and holding the UID-SW for 12 seconds, all BMC settings including
username and password will revert back to the factory default. Only the network settings
and FRU are retained.
Function User Input Behavior LED Activity
UID LED Indicator
Push Once Turns on the UID LED UID LED turns solid blue
Push Again 󰀨 󰀨
BMC Reset
Push and hold for 6 seconds BMC will do a cold boot BMC Hearbeat LED turns solid green
Push and hold for 12 seconds BMC will reset to factory default BMC Hearbeat LED turns solid green
VGA Port
A video (VGA) port is located on the I/O back panel. Refer to the board layout below for the
location.