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S
S
UPER
ERVER 2027GR-TRFH/2027GR-TRFHT User's Manual
Unit Identifi er Switch
A Unit Identifi er (UID) switch and two LED
indicators are provided on the serverboard.
The rear UID LED (LE4) is located next
to the rear UID switch. The front panel
UID LED is on pins 7/8 of JF1. Connect
a cable to pins 7/8 on JF1 for front panel
UID indication. Pressing the UID switch will
turn on both the rear and front UID LEDs.
Pressing the UID switch again will turn
off both LEDs. These UIDs provide easy
identifi cation of a system unit that may be
in need of service.
Note: the UID can also be triggered via
IPMI. Please refer to the IPMI User's Guide
posted on our Website.
Overheat LED/Fan Fail
The JOH1 header is used to connect an
LED indicator to provide warnings of chas-
sis overheating and fan failure. This LED
will blink when a fan failure occurs. Refer
to the tables on right for pin defi nitions.
Power SMB (I
2
Power System Management Bus (I
Connectors (JI
supply, fan and system temperatures. See
the table on the right for pin defi nitions.
C) Connectors
C1/JI
C2) monitor power
2
2
Color/State OS Status
Blue:
On
Blue:
Blinking
Pin#
1
2
3
4
State
Solid
Blinking
Pin#
C)
2
1
2
3
4
5
5-20
UID LED (LE4)
Status
Windows OS
Unit Identifi ed
Linux OS
Unit Identifi ed
UID Switch
Defi nition
Button In
Ground
Ground
Ground
Overheat LED
Pin Defi nitions
Pin#
Defi nition
1
5vDC
2
OH Active
OH/Fan Fail LED
Status
Message
Overheat
Fan Fail
PWR SMB
Pin Defi nitions
Defi nition
Clock
Data
PWR Fail
Ground
+3.3V
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