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Unit Identifier Switch
A Unit Identifier (UID) Switch and two LED
Indicators are located on the motherboard. The
UID Switch is located next to the VGA port on
the back panel. The Rear UID LED (LED7) is
located next to the UID Switch. The Front Panel
UID LED is located at pin 7 of the Front Control
Panel at JF1. Connect a cable to pin 7 on JF1
for Front Panel UID LED indication. When you
press the UID switch, both Rear UID LED and
Front Panel UID LED Indicators will be turned
on. Press the UID switch again to turn off both
LED Indicators. These UID Indicators provide
easy identification of a system unit that may be
in need of service.
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 http://www.supermicro.
com.
VGA
A VGA port is located next to the LAN 2/4 ports
on the I/O back panel. Use this port to connect
to a compatible VGA display.
D
B
A
JUIDB1
VGA
BMC
LAN2/LAN4
JI2C1
A1SAi/A1SRi Series Motherboard
Rev. 1.00
JI2C2
Battery
JWD1
JF1
1
J3
SP1
USB2.0-0/1
COM1
USB3.0-0/1
IPMI_LAN
LAN1/LAN3
Marvell
PHY
BIOS
JBT1
CPU
FAN3
FAN1
Color/State OS Status
Blue: On
Blue:
Blinking
Ground
X
FP PWRLED
HDD LED
NIC1 Activity LED
NIC2 Activity LED
OH/Fan Fail/PWR Fail
Power Fail LED
Ground
Ground
2-13
Chapter 2: Installation
UID Switch
Pin#
Definition
1
Ground
2
Ground
3
Button In
4
Button In
UID LED
Status
Windows OS
Unit Identified
Linux OS
Unit Identified
A. UID Switch
B. Rear UID LED
C. Front UID LED
D. VGA
20
19
NMI
X
3.3 V
3.3V Stby
3.3V Stby
3.3V Stby
C
UID LED
3.3V
Reset
Reset Button
Power Button
PWR
2
1
D
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