GIGA-BYTE TECHNOLOGY GIGABYTE GS-S12-P04R, User Manual

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Pin Definition
1 SMB_CLK
2 SMB_DATA
3 PSU_ALERT
4 GND
5 Power (3.3V)
1
20) PMBUS (Power supply I
2
C Connector)
Power System Management Bus (I2C) header at PMBUS monitors the power supply, fan and system
temperatures. Refer to the table below for pin definitions.
Pin Definition
1-2 NA (Default)
2-3 Clear CMOS
1
21) CLR_CMOS
CLR_CMOS is used to clear CMOS, which will also clear any passwords. Instead of pins, this jumper
consists of contact pads to prevent accidentally clearing the contents of CMOS.
Pin Definition
1 Intrusion Input
2 GND
1
22) CI
A Chassis Intrusion header is located at CI on the motherboard. Attach the appropriate cable from the
chassis to the header to inform you when the chassis is opened.
Pin Definition
1 GND
2 Power (12V)
3 FAN_TACH
4 FAN_PWM
1
1
CPU_FAN2 CPU_FAN1
23) CPU_FAN1/CPU_FAN2
There are two CPU fan headers on the motherboard. These are 4-pin fan headers; pins 1-3 are backward
compatible with traditional 3-pin fans. The onboard fan speeds are controlled by Thermal Management (via
Hardware Monitoring) in the BIOS. When using Thermal Management setting, please use all 3-pin fans or
all 4-pin fans.
You may clear the CMOS values by this jumper:
1. First power down the system and unplug the
power cord(s).
2. Remove the cover of the chassis to access the
motherboard.
3. Remove the onboard battery from the
motherboard.
4. Short the CMOS pads with a metal object such
as a small screwdriver for at least four seconds.
5. Remove the screwdriver (or shorting device).
6. Put the battery back on the motherboard and
replace the cover, reconnect the power cord(s)
and power on the system.
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