SUPER MICRO Computer FAN0103L4 user manual Explanation of Jumpers, JP25, JP18 MM2

Appendix F: SATA-743 Backplane Specifications

F-7 Front Jumper Locations and Pin Definitions

SUPER	R			JP25
		SATA743	REV 3.00	pb

JP25

49
64	16
1	H3

OH LED

JP18: BUZZER RESET

JP35: GEM24 RST

JP25: OH TEMP.

OPEN 45 C

1-2 50 C

2-3 55 C

JP18 MM2

75H

					BZ1
		#7	#5	#3	#1
JP10	JP13	ACT IN
+12V GND GND +5V	+12V GND GND	+5V
		#6	#4	#2	#0

Figure F-2: Front Jumpers

Socket Settings

Jumper

JP18

JP25

Setting

Open: No Reset (Default)

Closed: Reset

Open: 45º C

1-2: 50º C (Default)

2-3: 55º C

Note

Buzzer reset*

Overheat temperature setting.

Explanation of Jumpers

To modify the operation of the backplane, jumpers can be used to choose between optional settings. Jumpers create shorts be- tween two pins to change the function of the connector. Pin 1 is identified with a square

solder pad on the printed circuit board. Note: On two pin jumpers, "Closed" means the

jumper is on and "Open" means the jumper is off the pins.

Connector

Pins

Jumper

Setting

3 2 1

3 2 1

*The buzzer sound indicates that a condition requiring immediate attention has occurred.

The buzzer alarm is triggered by the following conditions:

1.Hard drive failure

2.System temperature over 50º Celsius.

F-5