Supermicro SuperServer SYS-220ME-FN6R - Page 66

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Chapter 4: Motherboard Connections
UID (Unit Idencation)/BMC Reset Switch and UID/BMC Reset LED Indicators
A UID LED/BMC reset switch (JUIDB1) is located on the rear side of the motherboard. This
switch has dual functions. It can be used to identify a system unit that is in need of service,
and it can also be used to reset the BMC settings.
When functioning as a UID LED switch, JUIDB1 will turn both the rear UID LED (LE1) and
󰀨󰀨
When functioning as a BMC reset switch, JUIDB1 will trigger a cold reboot when the user
presses and holds the switch for 6 seconds. It will also restore the BMC to the manufacturer's
default when the user presses and holds the switch for 12 seconds.

BMC Heartbeat LED (LEDBMC) and front/rear UID LEDs. Refer to the tables below for more
information. Please note that UID can also be triggered via BMC on the motherboard. Refer
to the BMC User's Guide posted on our website at http://www.supermicro.com for more
information on BMC.
UID/BMC Reset Switch (JUIDB1) Features and Settings
When Used as a UID LED Switch
(works with LE1 & Pins 7 & 8 on JF1)
When Used as a BMC Reset Switch
(works with BMC Heartbeat LED (LEDM1))
Color Status
BMC Heartbeat LED LEDM1 Green Blinking: BMC Normal
Blue: On 
BMC Reset: Press and hold the
switch (JUIDB1) for 6 seconds
LEDM1: Solid green: during reboot
Press the switch (JUIDB1) to turn
󰀨
indicators.
Triggering a cold reboot; LED: solid green on
during cold reboot
BMC Reset: Press & hold the
switch (JUIDB1) for 12 seconds
LEDM1: Solid green: during BMC reset
BMC: Reset to the manufacturer's default;
LED: solid green on during BMC Reset
UID/BMC Reset Switch
(JUIDB1) Pin Denitions
Pin# Denition
1 Ground
2 Ground
3 Button In
4 Button In